CN112299611A - Wastewater treatment method and system - Google Patents
Wastewater treatment method and system Download PDFInfo
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- CN112299611A CN112299611A CN202011027801.9A CN202011027801A CN112299611A CN 112299611 A CN112299611 A CN 112299611A CN 202011027801 A CN202011027801 A CN 202011027801A CN 112299611 A CN112299611 A CN 112299611A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/4608—Treatment of water, waste water, or sewage by electrochemical methods using electrical discharges
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/50—Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/04—Disinfection
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Abstract
The invention provides a wastewater treatment method and a wastewater treatment device, and belongs to the field of water environment protection. The wastewater treatment method provided by the invention obtains the first treated wastewater after electrocatalysis treatment, wherein the first treated wastewater comprises active oxygen and gas nuclei, and also obtains the second treated wastewater after plasma high-voltage pulse discharge treatment, which comprises chemical active substances, the hydroxyl water is obtained after the first treated wastewater and the second treated wastewater are mixed, and the rest waste water and the hydroxyl water are subjected to hydrodynamic cavitation treatment, the hydrodynamic cavitation treatment can improve the generation environment of chemical active substances, and the generation amount of chemical active substances is increased, and the hydrodynamic cavitation treatment can be efficiently performed in the presence of gas nuclei, so that, the hydrodynamic cavitation treatment of the hydroxyl water can effectively combine the effects of electrocatalysis treatment and plasma high-voltage pulse discharge treatment, remarkably improve the removal capacity of the hydroxyl water on pollutants, bacteria, viruses and the like which are difficult to degrade, improve the efficiency of wastewater treatment, and reduce the cost of wastewater treatment.
Description
Technical Field
The invention relates to the field of water environment protection, in particular to a wastewater treatment method and a wastewater treatment system.
Background
With the continuous deepening of the green development concept, higher requirements are put forward on the treatment of wastewater generated in production and life.
At present, waste water which is highly polluted and difficult to treat, such as landfill leachate, NF/RO (Nanofilm/Reverse Osmosis, nanofiltration/Reverse Osmosis) concentrated solution and the like, has poor biodegradability, poor compatibility with the existing biochemical treatment technology, such as an activated sludge method, a coagulation flocculation method, an advanced oxidation method and the like, low treatment effect and high cost; therefore, a double-membrane method is often adopted for high-pollution and difficult-to-treat wastewater, but the double-membrane method only concentrates and transfers pollutants, but obtains a more polluted concentrated solution, and has a limited treatment effect on the wastewater.
Disclosure of Invention
The invention provides a wastewater treatment method and a wastewater treatment device, which aim to solve the problem of low accuracy of a prediction result in the prior art.
In a first aspect, the present invention provides a method for treating wastewater, which may comprise:
dividing the wastewater to be treated into three paths, including electro-catalysis wastewater, plasma high-voltage pulse discharge wastewater and residual wastewater;
carrying out electrocatalysis treatment on the electrocatalysis wastewater to obtain first treatment wastewater;
carrying out plasma high-voltage pulse discharge treatment on the plasma high-voltage pulse discharge wastewater to obtain second treatment wastewater;
carrying out gas-liquid mixing on the first treated wastewater and the second treated wastewater to obtain hydroxyl water;
performing hydrodynamic cavitation treatment on the hydroxyl water, and mixing the hydroxyl water with the residual wastewater to obtain treated wastewater;
and under the condition that the treated wastewater does not meet the preset treatment standard, taking the treated wastewater as the wastewater to be treated again, and repeating the steps.
Optionally, before the hydrodynamic cavitation of the hydroxyl water and mixing with the residual wastewater to obtain treated wastewater, the method further includes:
performing impact cavitation treatment on the residual wastewater to obtain third treated wastewater;
the hydrodynamic cavitation treatment of the hydroxyl water and the mixing of the hydroxyl water and the residual wastewater to obtain treated wastewater comprises the following steps:
and carrying out hydrodynamic cavitation treatment on the hydroxyl water, and mixing the hydroxyl water with the third treated wastewater to obtain treated wastewater.
Optionally, the performing an electrocatalytic treatment on the electrocatalytic wastewater to obtain a first treated wastewater includes:
and under the condition that the flow of the electrocatalytic wastewater is 1-8 tons per hour, carrying out electrocatalytic treatment on the electrocatalytic wastewater to obtain first treated wastewater.
Optionally, the gas-liquid mixing the first treated wastewater and the second treated wastewater to obtain hydroxyl water includes:
and under the condition that the confining pressure is 10-20 KPa, carrying out gas-liquid mixing on the first treated wastewater and the second treated wastewater to obtain hydroxyl water.
Optionally, the total residual oxidant mass per ton of said hydroxyl water is between 3 and 10 grams.
Optionally, the preset treatment standard is that the concentration of the pollutants in the treated wastewater is below 30 million parts per concentration.
The second aspect of the embodiment of the invention provides a wastewater treatment system, which comprises a wastewater pool, an electro-catalysis device, a plasma high-voltage pulse discharge device, a gas-liquid mixing device and a cavitation treatment device; the wastewater pool comprises wastewater to be treated;
the waste water pool is used for conveying electro-catalytic waste water to the electro-catalytic device through a first pipeline, conveying plasma high-voltage pulse discharge waste water to the plasma high-voltage pulse discharge device through a second pipeline, and conveying residual waste water to the cavitation treatment device through a third pipeline;
the electro-catalysis device is used for carrying out electro-catalysis treatment on the electro-catalysis wastewater to obtain first treated wastewater, and conveying the first treated wastewater to the gas-liquid mixing device through a fourth pipeline;
the plasma high-voltage pulse discharge device is used for carrying out plasma high-voltage pulse discharge treatment on the plasma high-voltage pulse discharge wastewater to obtain second treated wastewater, and conveying the second treated wastewater to the gas-liquid mixing device through a fifth pipeline;
the gas-liquid mixing device is used for carrying out gas-liquid mixing on the first treated wastewater and the second treated wastewater to obtain hydroxyl water, and the hydroxyl water is conveyed to the cavitation treatment device through a sixth pipeline;
and the cavitation treatment device is used for carrying out hydrodynamic cavitation treatment on the hydroxyl water, mixing the hydroxyl water with the residual wastewater to obtain treated wastewater, and conveying the treated wastewater into the wastewater pool through a seventh pipeline to be used as the wastewater to be treated again under the condition that the treated wastewater does not meet the preset treatment standard.
Optionally, the cavitation treatment device is further configured to perform impact cavitation treatment on the residual wastewater to obtain third treated wastewater;
the cavitation treatment device is specifically used for performing hydrodynamic cavitation treatment on the hydroxyl water, and mixing the hydroxyl water with the third treated wastewater to obtain treated wastewater.
Optionally, the electrocatalysis device is specifically configured to perform electrocatalysis treatment on the electrocatalysis wastewater under the condition that the flow rate of the electrocatalysis wastewater is 1 ton to 8 tons per hour, so as to obtain first treated wastewater.
Optionally, the gas-liquid mixing device is specifically configured to, under a situation that the confining pressure is 10KPa to 20KPa, perform gas-liquid mixing on the first treated wastewater and the second treated wastewater to obtain the hydroxyl water.
Compared with the related art, the invention has the following advantages:
the embodiment of the invention obtains the first treated wastewater after electrocatalysis treatment, wherein the first treated wastewater comprises active oxygen and gas nuclei, and also obtains the second treated wastewater after plasma high-pressure pulse discharge treatment, wherein the second treated wastewater comprises chemical active substances, the first treated wastewater and the second treated wastewater are mixed to obtain hydroxyl water, and the rest wastewater and the hydroxyl water are subjected to hydrodynamic cavitation treatment, the hydrodynamic cavitation treatment can improve the generation environment of the chemical active substances and improve the generation amount of the chemical active substances, the chemical active substances are the key for treating pollutants in the wastewater, the hydrodynamic cavitation treatment can be carried out at high efficiency in the presence of the gas nuclei, therefore, the hydrodynamic cavitation treatment on the hydroxyl water can effectively combine the effects of the electrocatalysis treatment and the plasma high-pressure pulse discharge treatment, and the capability of the hydroxyl water for removing difficultly-degradable pollutants, bacteria, viruses and the like is obviously improved, the efficiency of waste water treatment is promoted, and the cost of waste water treatment is reduced.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 is a flow chart illustrating the steps of a wastewater treatment method according to an embodiment of the present invention;
FIG. 2 is a flow chart illustrating steps of a wastewater treatment method according to an embodiment of the present invention;
fig. 3 is a block diagram of a wastewater treatment system according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
FIG. 1 is a flow chart illustrating the steps of a wastewater treatment process provided by an embodiment of the present invention, which may include:
In the embodiment of the invention, the wastewater to be treated can be garbage percolate, NF/RO concentrated solution, domestic wastewater, biochemical industrial wastewater and the like, the wastewater to be treated can comprise one wastewater or a mixture of more than two kinds of wastewater, and the type and the source of the wastewater to be treated are not particularly limited.
In the embodiment of the invention, the wastewater to be treated can be divided into three paths, the wastewater to be treated in each path has the same treatment mode, and the three paths of wastewater to be treated can comprise one path of electrocatalytic wastewater to be treated by electrocatalysis; one path of plasma high-voltage pulse discharge wastewater is treated by plasma high-voltage pulse discharge; and one path of residual wastewater except the two paths of residual wastewater in the wastewater to be treated. In practical applications, the wastewater may be treated by the same treatment method in a plurality of reaction apparatuses, and in this case, the wastewater supplied to the plurality of reaction apparatuses of the same treatment method may be treated by one line. According to different actual wastewater treatment modes, the technical personnel in the field can add or reduce the number of the water paths for dividing the wastewater to be treated according to actual requirements.
And 102, carrying out electrocatalysis treatment on the electrocatalysis wastewater to obtain first treatment wastewater.
In the embodiment of the invention, the electrocatalysis treatment refers to a treatment process of performing catalysis on electrocatalysis wastewater through an electrocatalysis assembly to generate first treatment fly wastewater containing various active oxygen and gas nuclei, wherein the active oxygen can comprise superoxide anions, hydrogen peroxide, hydroxyl radicals and the like, and the gas nuclei can reach the nanometer level. Optionally, the electrocatalytic component generally includes an electrode, an electrolyte, and the like, and the electrode and the electrolyte interface are catalyzed by charge transfer, and optionally, the electrode may be made of an electrical material such as a metal, a semiconductor, and the like, which is not particularly limited by the embodiment of the present invention.
And 103, carrying out plasma high-voltage pulse discharge treatment on the plasma high-voltage pulse discharge wastewater to obtain second treatment wastewater.
In the embodiment of the present invention, the plasma high-voltage pulse discharge treatment refers to a treatment process of treating the plasma high-voltage pulse discharge wastewater by the plasma high-voltage pulse discharge assembly to obtain a second treatment wastewater containing active substances, wherein the active substances may include-OH (hydroxyl radical), O- (oxygen radical), HO- (oxygen radical)2Transient active substances such as hydroxyl radicals, long-life active substances such as ozone and hydrogen peroxide, and plasmas with higher activity such as hydroxyl radicals. In addition, physical effects such as ultraviolet light, shock waves, ultrasonic cavitation and the like can be generated in the plasma high-voltage pulse discharge treatment, and the generation amount of active substances in the second treatment wastewater is increased.
And 104, mixing the first treated wastewater and the second treated wastewater to obtain hydroxyl water.
In the embodiment of the invention, hydroxyl free radicals can induce a series of free radical chain reactions in the wastewater, react with various organic pollutants, open and break the chains of the organic pollutants, change macromolecules into small molecules and even further degrade the small molecules into carbon dioxide, water and other mineral salts, so that the content of the hydroxyl free radicals is the key for influencing the wastewater treatment efficiency of the hydroxyl water.
In the embodiment of the present invention, the gas-liquid mixing refers to a process of mixing active oxygen and gas nuclei in the first treated wastewater and active substances in the second treated wastewater by a gas-liquid mixing device to obtain hydroxyl water, wherein the active oxygen and the active substances are mixed and reacted in the hydrodynamic cavitation treatment to obtain hydroxyl water containing a large amount of hydroxyl radicals, and pollutants in the wastewater can be efficiently treated by the strong oxidizing ability of the hydroxyl radicals.
And 105, performing hydrodynamic cavitation treatment on the hydroxyl water, and mixing the hydroxyl water with the residual wastewater to obtain treated wastewater.
In the embodiment of the invention, the hydrodynamic cavitation treatment refers to a process of cavitation by using water to generate cavitation bubbles, wherein the cavitation refers to a phenomenon that liquid suddenly generates cavitation bubbles when the pressure of the liquid is lower than saturated steam, the cavitation bubbles have extremely short service life, can be formed, grown and suddenly collapsed within microsecond level, and release huge energy in the collapsing process, so that local transient high pressure can be generated at the collapsing position and can reach 100bar (bar) to 5000bar, and local transient high temperature can reach 1000k (Kelvin) to 10000 k. The local high temperature and high pressure generated in the hydrodynamic cavitation treatment can improve the reaction environment for generating the hydroxyl radicals, the generation of the hydroxyl radicals is facilitated, the suddenly changed reaction environment can also promote water to directly generate a large amount of active substances, and meanwhile, the generation of the hydroxyl radicals can also be promoted by the phenomena of vortex, ultrasonic oscillation and the like generated by cavitation. Therefore, the hydrocavitation of the hydroxyl water can ensure the efficient generation and collapse of cavitation bubbles in the presence of gas nuclei, so that hydroxyl radicals are efficiently generated in active oxygen and active substances, and the hydroxyl water with stronger oxidizing capability is obtained.
In the embodiment of the invention, the residual wastewater can comprise electrocatalysis wastewater for generating hydroxyl water and wastewater to be treated except the plasma high-voltage pulse discharge wastewater, and the residual wastewater is mixed with the hydroxyl water after the hydrodynamic cavitation treatment so as to treat the residual wastewater or pollutants in the hydroxyl water to obtain the treated wastewater, and at the moment, a large amount of hydroxyl radicals can efficiently treat the pollutants. The hydroxyl water mixed with high efficiency can effectively shorten the time for removing refractory organic matters and sterilizing, improve the efficiency of wastewater treatment and reduce the cost of wastewater treatment.
And 106, under the condition that the treated wastewater does not meet the preset treatment standard, taking the treated wastewater as wastewater to be treated again, and repeating the steps.
In the embodiment of the invention, the preset treatment standard is a standard of pollutant content during wastewater recovery and discharge, when the treated wastewater does not meet the preset treatment standard, the treated wastewater can be used as the wastewater to be treated again, and the operations from the step 101 to the step 105 are repeated to circularly treat the wastewater to be treated, so that the effect of treating pollutants in the wastewater is improved.
In summary, the embodiment of the present invention obtains the first treated wastewater subjected to the electro-catalytic treatment, wherein the first treated wastewater includes active oxygen and gas nuclei, and also obtains the second treated wastewater subjected to the plasma high-voltage pulse discharge treatment, wherein the second treated wastewater includes chemical active substances, the first treated wastewater and the second treated wastewater are mixed to obtain hydroxyl water, and the residual wastewater and the hydroxyl water are subjected to the hydrodynamic cavitation treatment, the hydrodynamic cavitation treatment can improve the generation environment of the chemical active substances and increase the generation amount of the chemical active substances, the chemical active substances are the key for the treatment of the pollutants in the wastewater, and the hydrodynamic cavitation treatment can be performed with high efficiency in the presence of the gas nuclei, so that the hydrodynamic cavitation treatment on the hydroxyl water can effectively combine the effects of the electro-catalytic treatment and the plasma high-voltage pulse discharge treatment, and the capability of the hydroxyl water for removing the pollutants, bacteria, viruses, etc. which are difficult to degrade can be significantly improved, the efficiency of waste water treatment is promoted, and the cost of waste water treatment is reduced.
Fig. 2 is a flow chart illustrating steps of another sewage treatment method according to an embodiment of the present invention, as shown in fig. 2, the method may include:
In the embodiment of the present invention, step 201 may refer to the related description of step 101, and is not described herein again to avoid repetition.
202, carrying out electrocatalysis treatment on the electrocatalysis wastewater under the condition that the flow of the electrocatalysis wastewater is 1-8 tons per hour, and obtaining first treatment wastewater.
In the embodiment of the present invention, step 202 may correspond to the related description of step 102, and is not repeated herein to avoid repetition.
In the embodiment of the invention, in the electrocatalysis treatment, the gas core formed by the electrode can increase the ohmic resistance of the interface between the electrode and the electrolyte and obstruct the mass transfer and diffusion of the redox substances in the solution to the electrode, so that the bubble phenomenon on the surface of the electrode can be weakened or eliminated by adjusting the flow of the electrocatalysis wastewater or the electrode plate distance, the current magnitude and the like of an electrocatalysis assembly, thereby improving the catalysis performance and efficiency of the electrocatalysis treatment and generating the high-density gas core. Alternatively, the flow rate of the electrocatalytic wastewater may be controlled to be 1 ton to 8 tons per hour, that is, the flow rate of the electrocatalytic wastewater per hour is any value between 1 ton and 8 tons, such as 1 ton, 2 tons, 3 tons, 4 tons, 5 tons, 6 tons, 7 tons, 7.5 tons, or 8 tons, and this is not particularly limited in the embodiment of the present invention.
And 203, carrying out plasma high-voltage pulse discharge treatment on the plasma high-voltage pulse discharge wastewater to obtain second treatment wastewater.
In the embodiment of the present invention, step 203 may correspond to the related description referring to step 103, and is not described herein again to avoid repetition. Optionally, the flow rate of the plasma high-voltage pulse discharge wastewater may be the same as or different from that of the electrocatalysis wastewater, and a person skilled in the art can set the flow rate of the plasma high-voltage pulse discharge wastewater by himself or herself according to the requirement on the concentration of the hydroxyl water.
And 204, under the condition that the confining pressure is 10-20 KPa, carrying out gas-liquid mixing on the first treated wastewater and the second treated wastewater to obtain hydroxyl water.
In the embodiment of the present invention, step 204 may correspond to the related description referring to step 104, and is not repeated herein to avoid repetition.
In the embodiment of the invention, the confining pressure refers to an isobaric stress state, and the flow rate and the concentration of the hydroxyl water obtained after gas-liquid mixing are different under the condition of different confining pressures, wherein the confining pressure of the environment can be adjusted by adjusting the diameter of the hydroxyl water outlet valve, and can also be adjusted by other modes. Alternatively, the confining pressure may be adjusted to 10KPa to 20KPa, that is, the confining pressure is any value between 10KPa and 20KPa, such as 10KPa, 12KPa, 14KPa, 16KPa, 18KPa, and 20KPa, and at this time, the flow rate of the hydroxyl water is 10 tons to 15 tons per hour.
Optionally, the total residual oxidant mass per ton of said hydroxyl water is between 3 and 10 grams.
In the embodiment of the invention, the effective concentration of the hydroxyl radicals can be indirectly represented by measuring Total Residual Oxidants (TRO) in the hydroxyl water based on the instantaneous detection characteristics of the hydroxyl radicals, the service life is short, and the detection is difficult, so that the effective concentration of the hydroxyl radicals can be indirectly represented by measuring the Total Residual Oxidants (TRO) in the hydroxyl water, wherein the Oxidants include the hydroxyl radicals in the hydroxyl water, active oxygen from the first treated wastewater, active substances from the second treated wastewater, and the like, and the Oxidants in the hydroxyl water can degrade pollutants in the wastewater. Alternatively, the mass of total residual oxidant per ton of hydroxyl water can be any number between 3 grams and 10 grams, such as 3 grams, 5 grams, 7 grams, 9 grams, 9.5 grams, 10 grams, etc.
And step 205, performing impact cavitation treatment on the residual wastewater to obtain third treated wastewater.
In the embodiment of the invention, the residual wastewater is the wastewater to be treated except for the wastewater which is partially subjected to electrocatalysis treatment and the wastewater which is partially subjected to plasma high-voltage pulse discharge treatment. The impact cavitation treatment refers to a process of converting the residual wastewater into at least two cavitation jets, enabling the at least two cavitation jets to impact each other to perform cavitation treatment, and performing impact cavitation treatment on the residual wastewater can also generate a certain amount of hydroxyl radicals, so that the treatment efficiency of the wastewater is further improved.
In the embodiment of the invention, the rest wastewater can also be part of the wastewater subjected to impact cavitation treatment to obtain third treated wastewater, and the other part of the wastewater is added into the first treated wastewater and the second treated wastewater during gas-liquid mixing so as to adjust the concentration of the obtained hydroxyl water and obtain hydroxyl water with higher oxidation capacity.
And step 206, performing hydrodynamic cavitation treatment on the hydroxyl water, and mixing the hydroxyl water with the third treated wastewater to obtain treated wastewater.
In the embodiment of the present invention, step 206 may correspond to the related description referring to step 105, and is not repeated herein to avoid repetition.
And step 207, under the condition that the treated wastewater does not meet the preset treatment standard, taking the treated wastewater as wastewater to be treated again, and repeating the steps.
In the embodiment of the present invention, step 207 may correspond to the related description referring to step 106, and is not described herein again to avoid repetition.
Optionally, the preset treatment standard is that the concentration of the pollutants in the treated wastewater is below 30 million parts per concentration.
In the embodiment of the present invention, the parts per million concentration (ppm) refers to the parts per million of the solute in the solution to the total solution, wherein the kind of the pollutant in the treated wastewater is related to the wastewater to be treated, and can be expressed by COD (Chemical Oxygen Demand), i.e., the Oxygen equivalent of the substance that can be oxidized by the strong oxidant in the wastewater, the effluent of the wastewater treatment plant and the contaminated water, and is not particularly limited herein. Alternatively, when the concentration of the pollutant in the treated wastewater is below 30ppm, it may be determined that the treated wastewater is treated, and the treated wastewater may be recycled, discharged, or the like, and when the concentration of the pollutant in the treated wastewater is greater than 30ppm, it is determined that the treated wastewater is not treated, and the treated wastewater may be reused as the wastewater to be treated, and the steps from step 201 to step 206 may be performed thereon, and the wastewater may be recycled until the concentration of the pollutant is below 30 ppm.
The embodiment of the invention obtains the first treated wastewater after electrocatalysis treatment, wherein the first treated wastewater comprises active oxygen and gas nuclei, and also obtains the second treated wastewater after plasma high-pressure pulse discharge treatment, wherein the second treated wastewater comprises chemical active substances, the first treated wastewater and the second treated wastewater are mixed to obtain hydroxyl water, and the rest wastewater and the hydroxyl water are subjected to hydrodynamic cavitation treatment, the hydrodynamic cavitation treatment can improve the generation environment of the chemical active substances and improve the generation amount of the chemical active substances, the chemical active substances are the key for treating pollutants in the wastewater, the hydrodynamic cavitation treatment can be carried out at high efficiency in the presence of the gas nuclei, therefore, the hydrodynamic cavitation treatment on the hydroxyl water can effectively combine the effects of the electrocatalysis treatment and the plasma high-pressure pulse discharge treatment, and the capability of the hydroxyl water for removing difficultly-degradable pollutants, bacteria, viruses and the like is obviously improved, the efficiency of waste water treatment is promoted, and the cost of waste water treatment is reduced.
Fig. 3 is a block diagram of a wastewater treatment system 30 according to an embodiment of the present invention, and as shown in fig. 3, the wastewater treatment system 30 may include:
a wastewater pool 301, an electro-catalytic device 302, a plasma high-voltage pulse discharge device 303, a gas-liquid mixing device 304 and a cavitation treatment device 305; the wastewater tank 301 contains wastewater to be treated.
In the embodiment of the present invention, the wastewater treatment system 30 may be used to perform a cyclic treatment on the wastewater to be treated, such as landfill leachate, NF/RO concentrated solution, domestic wastewater, and biochemical industrial wastewater, until the treated wastewater is recoverable and dischargeable, and the wastewater to be treated may be the wastewater containing the pollutants difficult to degrade and difficult to treat. Alternatively, one skilled in the art may increase the efficiency of wastewater treatment by stacking the number of wastewater treatment systems 30 to increase the total amount of wastewater to be treated.
The wastewater pool 301 is configured to deliver electrocatalytic wastewater to the electrocatalytic device 302 through a first pipeline 3011, deliver plasma high-voltage pulse discharge wastewater to the plasma high-voltage pulse discharge device 303 through a second pipeline 3012, and deliver residual wastewater to the cavitation treatment device 305 through a third pipeline 3013.
In the embodiment of the present invention, as shown in fig. 3, a wastewater tank 301 is connected to an electro-catalytic device 302 through a first pipeline 3011, connected to a plasma high-voltage pulse discharge device 303 through a second pipeline 3012, and connected to a cavitation device 305 through a third pipeline 3013, wherein the wastewater tank 301 divides the wastewater to be treated into three parts by delivering the wastewater to be treated from different pipelines, wherein the wastewater to be treated delivered to the electro-catalytic device 302 is electro-catalytic wastewater, the wastewater to be treated delivered to the plasma high-voltage pulse discharge device 303 is plasma high-voltage pulse discharge wastewater, and the wastewater to be treated delivered to the cavitation device 305 is residual wastewater. Optionally, a cavitation device water inlet valve 3014 may be disposed on the third pipeline 3013 to adjust the flow rate of the residual wastewater into the cavitation treatment device 305, which is not particularly limited in the embodiment of the present invention.
The electro-catalytic apparatus 302 is configured to perform electro-catalytic treatment on the electro-catalytic wastewater to obtain first treated wastewater, and deliver the first treated wastewater to the gas-liquid mixing apparatus 304 through a fourth pipeline 3021.
In the embodiment of the present invention, the electrocatalysis device 302 may be connected to the gas-liquid mixing device 304 through the fourth pipeline 3021, and after the electrocatalysis wastewater is electrocatalysis treated to obtain the first treated wastewater, the first treated wastewater is conveyed to the gas-liquid mixing device 304 through the fourth pipeline 3021, wherein the electrocatalysis treatment may correspond to the description related to step 102 in the wastewater treatment method shown in fig. 1, and no further description is provided herein for avoiding repetition.
In the embodiment of the present invention, an electrocatalysis water outlet valve 3022 may be disposed on the fourth pipeline 3021, and the electrocatalysis water outlet valve 3022 is configured to adjust a flow rate of the electrocatalysis wastewater when the electrocatalysis wastewater flows into the electrocatalysis device 302 and then flows out, so as to adjust the electrocatalysis wastewater in an optimal catalysis state by the electrocatalysis device 302, and optionally, the flow rate of the electrocatalysis wastewater may be correspondingly adjusted according to a total amount of wastewater to be treated, a treatment efficiency requirement, a cost and energy consumption condition, and the like.
Optionally, the electrocatalysis device 302 is specifically configured to, when the flow rate of the electrocatalysis wastewater is 1 ton to 8 tons per hour, perform electrocatalysis treatment on the electrocatalysis wastewater to obtain first treated wastewater.
In the embodiment of the present invention, the flow rate of the electrocatalytic wastewater may correspond to the description related to step 202 in the wastewater treatment method shown in fig. 1, and is not described herein again to avoid repetition.
The plasma high-voltage pulse discharge device 303 is configured to perform plasma high-voltage pulse discharge treatment on the plasma high-voltage pulse discharge wastewater to obtain second treated wastewater, and convey the second treated wastewater to the gas-liquid mixing device 304 through a fifth pipeline 3031.
In this embodiment of the present invention, the plasma high-voltage pulse discharge device 303 may be connected to the gas-liquid mixing device 304 through a fifth pipeline 3031, and after performing plasma high-voltage pulse discharge treatment on the plasma high-voltage pulse discharge wastewater to obtain second treated wastewater, the second wastewater is conveyed to the gas-liquid mixing device 304 through the fifth pipeline 3031, where the plasma high-voltage pulse discharge treatment may correspond to the description of step 103 in the wastewater treatment method shown in fig. 1, and is not repeated here to avoid repetition.
In the embodiment of the present invention, a plasma outlet valve 3032 may also be disposed on the fifth pipeline 3031 to control the flow rate of the plasma high-voltage pulse discharge wastewater, and reference may be made to the above description of the electrocatalysis outlet valve 3022 for details, which are not repeated herein for avoiding repetition.
The gas-liquid mixing device 304 is configured to perform gas-liquid mixing on the first treated wastewater and the second treated wastewater to obtain hydroxyl water, and deliver the hydroxyl water to the cavitation device 305 through a sixth pipeline 3041.
In the implementation of the present invention, the gas-liquid mixing device 304 may be connected to the cavitation device 305 through a sixth pipeline 3041, and after the first treated wastewater and the second treated wastewater are mixed by gas and liquid to obtain the hydroxyl water, the hydroxyl water may be conveyed to the cavitation device through the sixth pipeline 3041, wherein the gas and liquid mixing may correspond to the description of step 103 in the wastewater treatment method shown in fig. 1, and is not described herein again to avoid repetition.
In the embodiment of the present invention, the gas-liquid mixing device 304 may further be connected to the fourth pipeline 3021 and the fifth pipeline 3031 through a gas-liquid mixing pipeline 3042, so that the first treated wastewater and the second treated wastewater enter the gas-liquid mixing pipeline 3042 first, are mixed in the gas-liquid mixing pipeline 3042, and enter the input port of the gas-liquid mixing device 304, and optionally, a gas-liquid mixing speed regulating valve 3043 may be disposed on the gas-liquid mixing pipeline 3042, so as to adjust the flow rate of the first treated wastewater and the second treated wastewater flowing into the gas-liquid mixing device 304 after being mixed.
Optionally, the gas-liquid mixing device is specifically configured to, under a situation that the confining pressure is 10KPa to 20KPa, perform gas-liquid mixing on the first treated wastewater and the second treated wastewater to obtain the hydroxyl water.
In the embodiment of the present invention, the gas-liquid mixing device 304 may be further connected to the pipe side of the third pipe 3013 through the mixed wastewater pipe 3044, so that when the wastewater tank 301 delivers the remaining amount of wastewater to the cavitation treatment device 305 through the third pipe 3013, a part of the remaining amount of wastewater is delivered to the gas-liquid mixing device 304, and is mixed with the first treated wastewater and the second treated wastewater, so as to adjust the concentration of the obtained hydroxyl water. Alternatively, a gas-liquid outlet pressure regulating valve 3045 may be disposed on a sixth pipeline 3041 connecting the gas-liquid mixing device 304 and the cavitation device 305, and the gas-liquid outlet pressure regulating valve 3045 may adjust the confining pressure to correspondingly adjust the flow rate of the mixed hydroxyl water, so as to control the amount of the residual wastewater and further adjust the concentration of the hydroxyl water. Optionally, the confining pressure may be adjusted to 10KPa to 20KPa, and specifically, the method may correspond to the related description of step 204 in the wastewater treatment method shown in fig. 2, and for avoiding repetition, details are not described herein again.
Optionally, the total residual oxidant mass per ton of said hydroxyl water is between 3 and 10 grams.
The cavitation device 305 is configured to perform hydrodynamic cavitation on the hydroxyl water, mix the hydroxyl water with the residual wastewater to obtain treated wastewater, and convey the treated wastewater to the wastewater tank 301 through a seventh pipeline 3051 to be reused as wastewater to be treated when the treated wastewater does not meet a preset treatment standard.
In the embodiment of the present invention, the hydrodynamic cavitation may be performed on the hydroxyl water, the oxidant in the hydroxyl water is efficiently mixed to generate a large amount of hydroxyl radicals, and then the hydroxyl radicals are mixed with the remaining wastewater, and the hydroxyl radicals explain the pollutants, so as to obtain the treated wastewater, where the hydrodynamic cavitation may correspond to the description of step 105 in the wastewater treatment method shown in fig. 1, and no further description is provided herein for avoiding repetition. Optionally, the cavitation device 305 may include a venturi cavitation device, and the hydroxyl water is input into the venturi cavitation device through the sixth pipeline 3041 to be efficiently mixed, so as to obtain hydroxyl water containing a large amount of hydroxyl radicals.
In an embodiment of the present invention, a total water return valve 3052 may be disposed on the seventh pipe 3051 to control the flow rate of the treated wastewater, which does not meet the preset treatment standard, to be delivered to the wastewater pool 301 as the treated wastewater by the cavitation treatment apparatus 305, and optionally, the flow rate of the treated wastewater passing through the seventh pipe 3051 may be adjusted to be 50 tons to 80 tons per hour, such as 50 tons, 55 tons, 60 tons, 70 tons, and 80 tons per hour, by the total water return valve 3052, which is not particularly limited in this embodiment of the present invention.
Optionally, the cavitation treatment device 305 is further configured to perform impact cavitation treatment on the residual wastewater to obtain third treated wastewater.
The cavitation device 305 is specifically configured to perform hydrodynamic cavitation on the hydroxyl water, and mix the hydroxyl water with the third treated wastewater to obtain treated wastewater.
In the embodiment of the present invention, the residual wastewater may be subjected to the impact cavitation treatment to obtain the third treated wastewater, wherein the impact cavitation treatment may correspond to the description in step 205 in fig. 2, and is not described herein again to avoid repetition. At this time, the hydroxyl water is mixed with the third treated wastewater to obtain treated wastewater. Optionally, the cavitation treatment device 305 may further include opposing cavitation impinging stream nozzles, and the residual wastewater undergoes impinging cavitation through the opposing cavitation impinging stream nozzles to obtain third treated wastewater.
Optionally, the preset treatment standard is that the concentration of the pollutants in the treated wastewater is below 30 million parts per concentration.
In the embodiment of the present invention, the preset processing standard may correspond to the related description of step 207 in the wastewater treatment method shown in fig. 2, and is not described herein again for avoiding repetition.
In the embodiment of the present invention, pressure gauges may be further disposed on the third pipeline 3013, the sixth pipeline 3041, the mixed waste water pipeline 3044 and the seventh pipeline 3051, so as to determine the current flow rate according to the pressure parameter in the pipelines, so as to reasonably adjust the flow rate in each pipeline.
The following description of the process of wastewater treatment by the wastewater treatment system 30 shown in fig. 3 is given with reference to specific examples:
the waste water tank 301 conveys the electro-catalytic landfill leachate to the upper part of the electro-catalytic device 302 through a first pipeline 3011, the electro-catalytic landfill leachate flows through the polar plate of the electro-catalytic device 302 for electro-catalytic treatment, a first treated waste liquid flows out from the bottom and enters a fourth pipeline 3021, and the flow rate of the landfill leachate in the circuit is adjusted to 1 ton to 3 tons per hour through an electro-catalytic water outlet valve 3022 on the fourth pipeline 3021.
The landfill leachate is conveyed to the plasma high-voltage pulse discharge device 303 through a second pipeline 3012 in the wastewater tank 301 to obtain second treated wastewater, the second treated wastewater enters a fifth pipeline 3031, and the flow of the landfill leachate in the pipeline is adjusted to be 1 ton to 3 ton per hour through a plasma water outlet valve 3032 on the fifth pipeline 3031.
The first treated wastewater in the fourth line 3021 and the second treated wastewater in the fifth line 3031 flow into the gas-liquid mixing line 3042, and the flow rate of the first treated wastewater and the second treated wastewater mixed in the gas-liquid mixing line 3042 is adjusted by the gas-liquid mixing control valve 3043 to 2 to 6 tons per hour and then flow into the gas-liquid mixing device 304.
The first treated wastewater, the second treated wastewater, and a part of the remaining wastewater introduced through the mixed wastewater pipeline 3044 are subjected to gas-liquid mixing in the gas-liquid mixing device 304 to obtain hydroxyl water, the hydroxyl water is conveyed to the venturi cavitator 3051 in the cavitation treatment device 305 through the sixth pipeline 3041, and is efficiently mixed by hydrodynamic cavitation, and the flow rate of the hydroxyl water is adjusted to 10 to 15 tons per hour by the gas-liquid outlet pressure regulating valve 3045 on the sixth pipeline 3041, and the TRO of the hydroxyl water is adjusted to 3 to 10 grams per ton.
The wastewater pool 301 pumps the rest wastewater to the impact cavitator 3052 in the cavitation device 305 through a water pump on the third pipeline 3013 for impact cavitation to obtain third treated wastewater, and the third treated wastewater is added into the venturi cavitator 3051 to be mixed with the hydroxyl water to obtain treated wastewater.
When the concentration of pollutants in the wastewater to be treated is more than 30ppm, the wastewater to be treated is used as the wastewater to be treated again, the wastewater to be treated is conveyed into the wastewater pool 301 through the seventh pipeline 3051, the flow rate of the wastewater to be treated in the seventh pipeline 3051 is adjusted to be 50-80 tons per hour by the total water return valve 3052 on the seventh pipeline 3051, the wastewater is circulated repeatedly, and COD in the wastewater after the post-treatment for 8 hours is reduced to 30ppm from 12000 ppm.
At present, the treatment of equivalent wastewater by an electrocatalysis device usually requires 27 to 28 hours, the treatment of equivalent wastewater by a plasma high-voltage pulse discharge device usually requires 17 to 18 hours, and the removal effect of COD is not good and can only be reduced to about 2000ppm, in the embodiment of the invention, by obtaining the first treated wastewater subjected to electrocatalysis treatment, which comprises active oxygen and gas nuclei, and also obtaining the second treated wastewater subjected to plasma high-voltage pulse discharge treatment, which comprises chemical active substances, mixing the first treated wastewater and the second treated wastewater to obtain hydroxyl water, and performing hydrodynamic cavitation treatment on the residual wastewater and the hydroxyl water, the hydrodynamic cavitation treatment can improve the generation environment of the chemical active substances and increase the generation amount of the chemical active substances, and the hydrodynamic cavitation treatment can be performed with high efficiency in the presence of the gas nuclei, therefore, the hydrodynamic cavitation treatment of the hydroxyl water can effectively combine the effects of the electrocatalysis treatment and the plasma high-voltage pulse discharge treatment, so that the two advanced oxidation technologies have enhancement effects, the capability of the hydroxyl water in removing pollutants, bacteria, viruses and the like which are difficult to degrade is obviously improved, the efficiency of wastewater treatment is improved, and the cost of wastewater treatment is reduced.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described apparatuses and modules may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (10)
1. A method of wastewater treatment, the method comprising:
dividing the wastewater to be treated into three paths, including electro-catalysis wastewater, plasma high-voltage pulse discharge wastewater and residual wastewater;
carrying out electrocatalysis treatment on the electrocatalysis wastewater to obtain first treatment wastewater;
carrying out plasma high-voltage pulse discharge treatment on the plasma high-voltage pulse discharge wastewater to obtain second treatment wastewater;
carrying out gas-liquid mixing on the first treated wastewater and the second treated wastewater to obtain hydroxyl water;
performing hydrodynamic cavitation treatment on the hydroxyl water, and mixing the hydroxyl water with the residual wastewater to obtain treated wastewater;
and under the condition that the treated wastewater does not meet the preset treatment standard, taking the treated wastewater as the wastewater to be treated again, and repeating the steps.
2. The method of claim 1, wherein the subjecting the hydroxyl radical water to hydrodynamic cavitation and mixing with the residual wastewater to obtain treated wastewater further comprises:
performing impact cavitation treatment on the residual wastewater to obtain third treated wastewater;
the hydrodynamic cavitation treatment of the hydroxyl water and the mixing of the hydroxyl water and the residual wastewater to obtain treated wastewater comprises the following steps:
and carrying out hydrodynamic cavitation treatment on the hydroxyl water, and mixing the hydroxyl water with the third treated wastewater to obtain treated wastewater.
3. The method of claim 1, wherein the subjecting the electrocatalytic wastewater to electrocatalytic treatment to obtain a first treated wastewater comprises:
and under the condition that the flow of the electrocatalytic wastewater is 1-8 tons per hour, carrying out electrocatalytic treatment on the electrocatalytic wastewater to obtain first treated wastewater.
4. The method of claim 1, wherein the gas-liquid mixing the first treated wastewater and the second treated wastewater to obtain hydroxyl water comprises:
and under the condition that the confining pressure is 10-20 KPa, carrying out gas-liquid mixing on the first treated wastewater and the second treated wastewater to obtain hydroxyl water.
5. The method of claim 1, wherein the total residual oxidant mass per ton of said hydroxyl water is between 3 and 10 grams.
6. The method of claim 1, wherein the predetermined treatment criteria is a concentration of contaminants in the treated wastewater of less than 30 parts per million.
7. A wastewater treatment system is characterized by comprising a wastewater pool, an electro-catalysis device, a plasma high-voltage pulse discharge device, a gas-liquid mixing device and a cavitation treatment device; the wastewater pool comprises wastewater to be treated;
the waste water pool is used for conveying electro-catalytic waste water to the electro-catalytic device through a first pipeline, conveying plasma high-voltage pulse discharge waste water to the plasma high-voltage pulse discharge device through a second pipeline, and conveying residual waste water to the cavitation treatment device through a third pipeline;
the electro-catalysis device is used for carrying out electro-catalysis treatment on the electro-catalysis wastewater to obtain first treated wastewater, and conveying the first treated wastewater to the gas-liquid mixing device through a fourth pipeline;
the plasma high-voltage pulse discharge device is used for carrying out plasma high-voltage pulse discharge treatment on the plasma high-voltage pulse discharge wastewater to obtain second treated wastewater, and conveying the second treated wastewater to the gas-liquid mixing device through a fifth pipeline;
the gas-liquid mixing device is used for carrying out gas-liquid mixing on the first treated wastewater and the second treated wastewater to obtain hydroxyl water, and the hydroxyl water is conveyed to the cavitation treatment device through a sixth pipeline;
and the cavitation treatment device is used for carrying out hydrodynamic cavitation treatment on the hydroxyl water, mixing the hydroxyl water with the residual wastewater to obtain treated wastewater, and conveying the treated wastewater into the wastewater pool through a seventh pipeline to be used as the wastewater to be treated again under the condition that the treated wastewater does not meet the preset treatment standard.
8. The system of claim 7, wherein the cavitation device is further configured to perform impact cavitation on the residual wastewater to obtain a third treated wastewater;
the cavitation treatment device is specifically used for performing hydrodynamic cavitation treatment on the hydroxyl water, and mixing the hydroxyl water with the third treated wastewater to obtain treated wastewater.
9. The system according to claim 7, wherein the electrocatalytic device is configured to electrocatalytic treat the electrocatalytic wastewater to obtain a first treated wastewater, in particular, at a flow rate of 1 to 8 tons per hour.
10. The system according to claim 7, wherein the gas-liquid mixing device is specifically configured to perform gas-liquid mixing on the first treated wastewater and the second treated wastewater to obtain the hydroxyl water under a confining pressure of 10KPa to 20 KPa.
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