CN216472731U - Blue charcoal waste water resourceful treatment device - Google Patents

Abstract

The utility model discloses a semi-coke wastewater resourceful treatment device, which comprises: the pretreatment unit is used for performing gravity oil removal and coke filtration treatment on the semi-coke wastewater; the oil removal unit is used for carrying out multiphase flow, electric flocculation and fine oil removal treatment on the wastewater after primary treatment; a stripping ammonia still unit comprising: a stripping deacidification tower and an ammonia still; the stripping deacidification tower is used for introducing wastewater subjected to secondary treatment for deacidification treatment and outputting the wastewater subjected to deacidification; the ammonia still is used for carrying out deamination treatment on the wastewater after deacidification and outputting the wastewater after deamination; and the targeted adsorption phenol extraction unit is used for removing oil and suspension from the deaminated wastewater and then adsorbing and extracting phenol by using a targeted adsorption material. The device provided by the utility model can realize resource recovery of crude phenol, heavy oil, light oil, ammonia and acid in the semi-coke wastewater, and has the advantages of easiness in operation, good semi-coke wastewater dephenolization treatment effect, high crude phenol recovery efficiency, high purity and low operation cost.

Description

Blue charcoal waste water resourceful treatment device

Technical Field

The utility model belongs to the technical field of wastewater treatment devices, and particularly relates to a semi-coke wastewater recycling treatment device.

Background

Semi-coke wastewater (also called semi-coke wastewater) is wastewater generated in the process of medium-low temperature dry distillation (about 550-650 ℃) of coal, has the characteristic of four high (high COD, high oil, high ammonia nitrogen and high phenol), contains organic pollutants which are difficult to degrade such as phenol, tar and ammonia, and has high treatment difficulty and great environmental hazard.

Phenol and petroleum substances contained in the semi-coke wastewater are organic substances with high toxicity and poor degradability, and can cause serious harm to human health and ecological balance after being accumulated in the environment for a long time, so that the phenol-containing wastewater is one of the harmful wastewater which is mainly solved in water pollution. On one hand, the treatment of the industrial phenol-containing wastewater can reduce the content of pollutants as much as possible to ensure that the industrial phenol-containing wastewater reaches the discharge standard; on the other hand, valuable substances such as phenol, ammonia, petroleum and the like in the water are recycled as much as possible, so that the resources are recycled.

In the semi-coke industry, the whole technological process has the link of ammonia distillation and dephenolization, however, the water for ammonia distillation and dephenolization has certain suspended oil and suspended solids, high chroma and high COD, the COD is approximately 4000-6000 mg/L, the phenol in the interior is about 1000mg/L, and the biodegradability is poor, if the water directly enters a biochemical system, the water can poison bacteria, the biodegradability is reduced, the whole biochemical operation is influenced, and the subsequent process can be greatly stressed, so that the equipment is frequently operated, the treatment cost is increased, and the phenol in the interior is not recycled, and the resource waste is realized.

Based on the reasons, the comprehensive recycling treatment of the high-concentration organic wastewater discharged in the semi-coke production process is urgent, and the method has profound influence on semi-coke enterprises under the policy of increasingly strict environmental protection and control. The project has great social significance and environmental protection significance, the recovered ammonia, phenol and oil can partially offset the operating cost, and the semi coke is extinguished by adopting clean water, so that the clean fuel with real significance is realized.

Although the traditional phenol ammonia recovery processing device can process and recover phenol and ammonia pollutants in semi-coke wastewater, the traditional phenol ammonia recovery processing device has the problems of high processing energy consumption, low purity of recovered phenol resources, poor system operation stability and the like.

In summary, a new semi-coke wastewater recycling treatment device is urgently needed

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a semi-coke wastewater recycling treatment device to solve one or more technical problems. The device provided by the utility model can realize resource recovery of crude phenol, heavy oil, light oil, ammonia and acid in the semi-coke wastewater, and has the advantages of easiness in operation, good semi-coke wastewater dephenolization treatment effect, high crude phenol recovery efficiency, high purity and low operation cost.

In order to achieve the purpose, the utility model adopts the following technical scheme:

the utility model relates to a semi-coke wastewater recycling treatment device, which comprises:

the pretreatment unit is used for performing gravity oil removal and coke filtration treatment on the semi-coke wastewater and outputting the wastewater after primary treatment;

the oil removal unit is used for carrying out multiphase flow, electric flocculation and fine oil removal treatment on the wastewater after the primary treatment and outputting the wastewater after the secondary treatment; wherein the fine oil removal treatment is oil removal treatment based on an oil drop coalescence principle;

a stripping ammonia still unit comprising: a stripping deacidification tower and an ammonia still; the stripping deacidification tower is used for introducing the wastewater subjected to the secondary treatment for deacidification treatment and outputting the wastewater subjected to deacidification treatment; the ammonia still is used for carrying out deamination treatment on the deacidified wastewater and outputting the deaminated wastewater;

and the targeted adsorption phenol extraction unit is used for removing oil and suspension from the deaminated wastewater, then adsorbing and extracting phenol by using a targeted adsorption material and outputting dephenolized wastewater.

Further, the preprocessing unit includes:

the gravity oil removal tank is used for carrying out gravity oil removal on the semi-coke wastewater and outputting the wastewater after the heavy oil and the light oil are separated;

and the coke filter is used for filtering oil residue, coke powder and tar in the wastewater after the heavy oil and light oil separation treatment and outputting the wastewater after primary treatment.

Further, the gravity oil removal tank is a semi-coke storage tank.

Further, the oil removing unit includes:

the multiphase flow device is used for separating floating oil, heavy oil and oil solid matters in the wastewater subjected to primary treatment from water to obtain water subjected to separation treatment;

the electric flocculation device is used for carrying out electric flocculation treatment on the water after the separation treatment;

the fine oil removal device comprises a coalescence oil removal filter element; the device is used for carrying out oil removal treatment on the wastewater after the electric flocculation treatment based on the oil drop coalescence principle and outputting the wastewater after secondary treatment.

Further, the targeted adsorption phenol extraction unit comprises: remove suspension device, move oily device and target adsorption equipment.

Furthermore, a nano-type adsorption filler is arranged in the targeted adsorption device and used for targeted extraction of phenol.

Further, still include: a biochemical treatment unit; the biochemical treatment unit comprises an anoxic tank and an aerobic tank;

the anoxic pond is used for reducing NO3-N and NO2-N into N2 by using organic matters in the dephenolized wastewater as a carbon source through denitrifying bacteria;

the aerobic tank is used for biochemically degrading organic matters in the wastewater treated by the anoxic tank by microorganisms under the action of nitrosobacteria and nitrobacteria, and ammoniating and nitrifying organic nitrogen.

Further, the biochemical processing unit further comprises:

and the secondary sedimentation tank is used for carrying out sludge-water mixed liquid separation treatment on the wastewater treated by the aerobic tank.

Compared with the prior art, the utility model has the following beneficial effects:

the device disclosed by the utility model can realize effective separation and resource recovery of crude phenol, heavy oil, light oil, ammonia and acid in the semi-coke wastewater, and has the advantages of easiness in operation, good semi-coke wastewater dephenolization treatment effect, high crude phenol recovery efficiency, high purity and low operation cost. In the device, an oil removal unit is added before stripping deacidification and deamination, so that the pollution and blockage of the stripping tower can be controlled; wherein, set up the deoiling unit in front of the strip ammonia distillation system and degrease, suspended solid such as coke breeze, buggy, tar colloid that can greatly control to get into in the strip tower waste water improves the anti-soil stifled performance of strip tower column plate, improves the operating stability of system. The device is provided with the targeted adsorption phenol extraction unit, the solubility of phenol in water is reduced by adopting high-efficiency electrochemistry, and then the targeted adsorption material is used for replacing a dephenolizing tower, so that the operation energy consumption can be reduced; phenol resources are recovered through targeted adsorption, and biochemical treatment of a later stage is provided, so that energy consumption and cost are reduced; the high-efficiency targeted adsorption technology is adopted to replace the traditional dephenolizing tower, so that the solubility of coal tar and phenol in water is greatly reduced, the secondary evaporation of waste water after ammonia evaporation treatment is avoided, and the treatment cost of the waste water is greatly reduced; the phenol efficiency is efficiently improved, the effluent index of wastewater treatment is ensured, the stability of water inlet and operation of a subsequent biochemical treatment process is ensured, and the impact is reduced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art are briefly introduced below; it is obvious that the drawings in the following description are some embodiments of the utility model, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.

FIG. 1 is a schematic view of a semi-coke wastewater resource treatment device according to an embodiment of the utility model;

FIG. 2 is a schematic view of a semi-coke wastewater recycling device according to another embodiment of the present invention;

in the figure, the position of the upper end of the main shaft,

1. a pre-processing unit; 101. a gravity oil removal tank; 102. a coke filter;

2. an oil removal unit; 201. a multiphase flow device; 202. an electrocoagulation device; 203. a fine oil removal device;

3. a steam stripping ammonia distillation unit; 301. a stripping deacidification tower; 302. an ammonia still;

4. a targeted adsorption phenol extraction unit; 401. a suspension removal device; 402. an oil transfer device; 403. a targeted adsorption device;

5. a biochemical treatment unit.

Detailed Description

In order to make the purpose, technical effect and technical solution of the embodiments of the present invention clearer, the technical solution of the embodiments of the present invention is clearly and completely described below with reference to the drawings in the embodiments of the present invention; it is to be understood that the described embodiments are only some of the embodiments of the present invention. Other embodiments, which can be derived by one of ordinary skill in the art from the disclosed embodiments without inventive faculty, are intended to be within the scope of the utility model.

Referring to fig. 1 and 2, a semi-coke wastewater recycling device according to an embodiment of the present invention includes:

a pretreatment unit 1 including a gravity degreasing tank 101 and a coke filter 102; according to the embodiment of the utility model, the pretreatment unit is used for gravity oil removal and coke filtration, the gravity oil removal is to separate heavy oil, light oil and semi-coke wastewater in semi-coke wastewater by settling the semi-coke wastewater in a gravity oil removal tank (a semi-coke storage tank can be adopted) for enough time through gravity settling, and the standing time can be 36-72 h; and after standing, discharging heavy oil from the bottom of the semi-coke wastewater storage tank, discharging light oil from the upper part of the semi-coke wastewater storage tank, discharging deoiled semi-coke wastewater from the middle part of the semi-coke wastewater storage tank, and filtering oil residue, coke powder, tar and other pollutants from the semi-coke wastewater through a coke filter to enter a subsequent deoiling unit (deoiling section).

The oil removal unit 2 comprises a multiphase flow device 201, an electric flocculation device 202 and a fine oil removal device 203; according to the embodiment of the utility model, the oil removal unit is used for further removing suspension oil, and oil residue and heavy coal tar separated by the pretreatment unit are further subjected to multiphase flow, electric flocculation and fine oil removal treatment to complete treatment of an oil removal section; the multiphase flow separation mainly separates floating oil, heavy oil and oil solid from a middle water layer, the separated water enters into the electric flocculation, the electric flocculation is a complex process, cations generated by a metal electrode under the action of an electric field comprise a plurality of physical and chemical phenomena when entering a water body, three continuous stages are included from the generation of ions to the formation of flocs, and under the action of the electric field, the anode generates electrons to form a 'micro-flocculant' -iron or aluminum hydroxide; the suspended particles and colloidal pollutants in the water lose stability under the action of a flocculating agent; and the destabilized pollutant particles and the micro-flocculant collide with each other to combine into macroscopic large flocs. In the process of adopting the electric flocculation, current enters water through the parallel metal electrode plates. The metal electrode plate is made of different materials according to different substances to be removed so as to achieve the best treatment effect, and iron, aluminum, graphite and the like are frequently used. The water after the electric flocculation treatment enters into a fine oil remover which mainly comprises a coalescence oil removing filter element and achieves the purpose of removing oil by the oil drop coalescence principle. The wastewater treated in the oil removal section meets the requirement of stripping inflow of the ammonia still.

And a stripping ammonia distillation unit 3, which is to send the wastewater from the stripping deacidification tower 301 into an ammonia distillation tower 302, directly heat the wastewater by low-pressure steam to strip and remove ammonia in the semi-coke wastewater, cool and absorb ammonia by a tower top condenser, control the temperature of the tower top of the stripping deamination to be greater than 0.2Mpa, control the concentration of the recovered concentrated ammonia water to be greater than 12 percent, and send the wastewater after deamination into a targeted adsorption phenol recovery unit, wherein the low-pressure steam used in the treatment is greater than 0.2Mpa, and the temperature of the tower top of the stripping deamination is controlled to be 90-95 ℃.

The targeted adsorption phenol extraction unit 4 comprises a suspension removal device 401, an oil removal device 402 and a targeted adsorption device 403, and is used for removing oil and suspension of semi-coke wastewater subjected to oil removal and deamination again, removing phenol and oil in the wastewater, allowing water subjected to suspension oil removal to enter a targeted adsorption material for adsorption phenol extraction, and allowing dephenolized wastewater to directly enter a biochemical treatment process. The targeted adsorption is internally provided with a nano-type adsorption filler, and valuable phenol is extracted in a targeted manner. The water after the targeted adsorption treatment enters a biochemical treatment unit.

The biochemical treatment unit 5 mainly comprises three parts of biochemical pretreatment, biochemical treatment and sludge treatment, wastewater enters a secondary AO biochemical treatment system, and in an anoxic pond, denitrifying bacteria reduce a large amount of NO3-N and NO2-N into N2 and release the N2 to the air by using organic matters in the wastewater as a carbon source, so that the COD concentration is reduced, and the NO3-N concentration is greatly reduced. In the aerobic tank, the organic matters are biochemically degraded by microorganisms under the action of nitrosobacteria and nitrobacteria and then continuously descend; the organic nitrogen is aminated and then nitrated, resulting in a significant drop in the NH3-N concentration. The sewage after biochemical treatment enters a secondary sedimentation tank which is mainly used for separating sludge-water mixed liquor of a biochemical treatment system. In the sedimentation tank, sludge is separated from clear water, the residual sludge is collected by a mud scraper in the tank and discharged from a mud bucket, and the supernatant automatically flows into a coagulating sedimentation treatment system. By adding the coagulant and the coagulant aid into the coagulating sedimentation tank, particles which are difficult to precipitate in water can be mutually polymerized to form colloid, and then the colloid is combined with impurities in a water body to form a larger flocculating constituent to be removed, so that the effluent is ensured to reach the standard.

According to the device provided by the embodiment of the utility model, pre-removing suspension oil removal treatment is added before stripping deacidification and deamination, so that the pollution and blockage of the stripping tower are controlled; the solubility of phenol in water is reduced by adopting efficient electrochemistry, and then a dephenolizing tower is replaced by a targeted adsorption material, so that the operation energy consumption is reduced; phenol resources are recovered through targeted adsorption, biochemical treatment of a rear section is provided, and energy consumption and cost are reduced. Specifically, the high-efficiency targeted adsorption technology is adopted to replace the traditional dephenolizing tower, so that the solubility of coal tar and phenol in water is greatly reduced, the secondary evaporation of waste water after ammonia evaporation treatment is avoided, and the treatment cost of the waste water is greatly reduced; the oil removing unit is arranged in front of the stripping ammonia distilling system, so that suspended matters such as coke powder, coal powder, tar colloid and the like entering the wastewater of the stripping tower are greatly controlled, the anti-fouling performance of tower plates of the stripping tower is improved, and the running stability of the system is improved; the device can realize that the removal rate of COD in the wastewater is more than 90 percent; the removal rate of the total phenol is more than 90 percent; the NH4-N removal rate is more than 95 percent; the oil removal efficiency is more than 90%; the phenol efficiency is efficiently improved, the effluent index of wastewater treatment is ensured, the stability of water inlet and operation of a subsequent biochemical treatment process is ensured, and the impact is reduced. The complete system device can realize effective separation and recovery of phenol, oil, ammonia and other substances, ensure the purity of various recovered resources and effectively realize resource recovery of pollutants.

Experiments prove that the device is used for treating semi-coke wastewater and can remove COD in the wastewater

10000-40000 mg/L is reduced to 2000mg/L, oil is reduced to 10mg/L from 500-5000 mg/L, and total phenol is reduced to 200mg/L from 2000-15000 mg/L. The treated wastewater meets the water inlet requirement of a subsequent biochemical treatment system, and the stable operation of the biochemical treatment system can be ensured.

Example 1: the semi-coke wastewater to be treated is semi-coke wastewater of certain semi-coke processing enterprises, is wastewater after deacidification, deamination and pre-deoiling, and has the main indexes of: COD: 3000 mg/L; oil: 500 mg/L; total phenols: 1200 mg/L; NH4-N: 500 mg/L; pH value: 7.5.

the practical process for treating wastewater by adopting the device provided by the embodiment of the utility model is as follows: the wastewater is treated by the whole set of device, and the effluent indexes are as follows: COD: 500mg/L and 10mg/L of oil; total phenols: 100 mg/L; NH4-N, none; pH value: 7.8 of; the removal rate of COD is 83 percent, the removal rate of oil is 98 percent, the removal efficiency of phenols is 91 percent, and the removal efficiency of NH4-N is more than 99 percent.

Example 2: the semi-coke wastewater to be treated for a certain coal chemical industry enterprise is wastewater subjected to deamination and pretreatment, and the main indexes are as follows: COD: 15000 mg/L; oil: 2500 mg/L; total phenols: 10000 mg/L; NH4-N: 3000 mg/L; pH value: 8.3.

the practical process for treating wastewater by adopting the device provided by the embodiment of the utility model is as follows: the wastewater is treated by the whole set of device, and the indexes of the wastewater before biochemical treatment are as follows: COD: 3000mg/L, oil: 8 mg/L; total phenols: 800 mg/L; 30mg/L of NH 4-N; pH value: 8.0; the removal rate of COD is 80%, the removal rate of oil is 99%, the removal efficiency of phenols is 92%, and the removal efficiency of NH4-N is more than 98%.

In conclusion, no mature semi-coke wastewater treatment device and process exist at home and abroad at present, most semi-coke enterprises directly use semi-coke wastewater as coke quenching water after simple oil removal, and the quality of semi-coke is seriously influenced. The treatment method mainly refers to a coking wastewater treatment process with similar water quality, but the water quality of the semi-coke wastewater is 10 times worse than that of the coking wastewater, the biodegradability of the wastewater is worse, and meanwhile, various treatment processes have severe problems in popularization and application at present, such as high primary investment cost, high operating cost, harsh reaction conditions, poisoning and fouling or scaling of an extracting agent, blockage of an ammonia evaporation pipeline, unstable operation and the like, which are also problems urgently needed to be solved in the field of semi-coke wastewater treatment. The efficient recycling treatment device for semi-coke wastewater provided by the embodiment of the utility model has the working principle that phenol, oil, ammonia and acid gas in the semi-coke wastewater are effectively removed by adopting treatment modes such as electric flocculation suspension removal, fine oil removal coalescence oil removal, steam stripping ammonia distillation rectification, targeted adsorption phenol extraction and the like, so that the treated wastewater meets the requirements of a biochemical treatment system; the process realizes the resource recovery of crude phenol, heavy oil, light oil, ammonia and acid in the wastewater, and has the advantages of easy operation, good wastewater dephenolization treatment effect, high crude phenol recovery efficiency, high purity, low system operation cost, good process economy and the like.

Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can make modifications and equivalents to the embodiments of the present invention without departing from the spirit and scope of the present invention, which is set forth in the claims of the present application.

Claims (8)

1. The utility model provides a blue charcoal waste water resourceful treatment device which characterized in that includes:

the pretreatment unit (1) is used for performing gravity oil removal and coke filtration treatment on semi-coke wastewater and outputting the wastewater after primary treatment;

the oil removal unit (2) is used for carrying out multiphase flow, electric flocculation and fine oil removal treatment on the wastewater after the primary treatment and outputting the wastewater after the secondary treatment; wherein the fine oil removal treatment is oil removal treatment based on an oil drop coalescence principle;

a stripping ammonia still unit (3) comprising: a stripping deacidification tower (301) and an ammonia still (302); the stripping deacidification tower (301) is used for introducing the wastewater subjected to the secondary treatment for deacidification treatment and outputting the wastewater subjected to deacidification treatment; the ammonia still (302) is used for carrying out deamination treatment on the deacidified wastewater and outputting the deaminated wastewater;

and the targeted adsorption phenol extraction unit (4) is used for performing oil removal and suspension removal treatment on the deaminated wastewater, then performing adsorption phenol extraction by using a targeted adsorption material, and outputting dephenolized wastewater.

2. The semi-coke wastewater resource treatment device according to claim 1, wherein the pretreatment unit (1) comprises:

the gravity oil removal tank (101) is used for carrying out gravity oil removal on the semi-coke wastewater and outputting the wastewater after the heavy oil and light oil separation treatment;

and the coke filter (102) is used for filtering oil residue, coke powder and tar in the wastewater after the heavy oil and light oil separation treatment and outputting the wastewater after primary treatment.

3. The semi-coke wastewater resource treatment device according to claim 2, characterized in that the gravity oil removal tank (101) is a semi-coke storage tank.

4. The semi-coke wastewater resource treatment device according to claim 1, wherein the oil removal unit (2) comprises:

a multiphase flow device (201) for separating floating oil, heavy oil and oil solid from water in the wastewater after primary treatment to obtain water after separation treatment;

an electric flocculation device (202) for performing electric flocculation treatment on the water after the separation treatment;

a fine oil removal device (203) comprising a coalescent oil removal filter element; the device is used for carrying out oil removal treatment on the wastewater after the electric flocculation treatment based on the oil drop coalescence principle and outputting the wastewater after secondary treatment.

5. The semi-coke wastewater resource treatment device according to claim 1, wherein the targeted adsorption phenol extraction unit (4) comprises: a suspension removal device (401), an oil removal device (402) and a targeted adsorption device (403).

6. The semi-coke wastewater resource treatment device according to claim 5, characterized in that the targeted adsorption device (403) is provided with nano-type adsorption filler for targeted extraction of phenol.

7. The semi-coke wastewater resource treatment device according to any one of claims 1 to 6, further comprising: a biochemical treatment unit (5); the biochemical treatment unit (5) comprises an anoxic tank and an aerobic tank;

the anoxic pond is used for reducing NO3-N and NO2-N into N2 by using organic matters in the dephenolized wastewater as a carbon source through denitrifying bacteria;

the aerobic tank is used for biochemically degrading organic matters in the wastewater treated by the anoxic tank by microorganisms under the action of nitrosobacteria and nitrobacteria, and ammoniating and nitrifying organic nitrogen.

8. The semi-coke wastewater resource treatment device according to claim 7, wherein the biochemical treatment unit (5) further comprises:

and the secondary sedimentation tank is used for carrying out sludge-water mixed liquid separation treatment on the wastewater treated by the aerobic tank.

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