CN111777223A - Landfill leachate stock solution pretreatment method and system for disc-tube reverse osmosis treatment - Google Patents
Landfill leachate stock solution pretreatment method and system for disc-tube reverse osmosis treatment Download PDFInfo
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- CN111777223A CN111777223A CN202010657778.5A CN202010657778A CN111777223A CN 111777223 A CN111777223 A CN 111777223A CN 202010657778 A CN202010657778 A CN 202010657778A CN 111777223 A CN111777223 A CN 111777223A
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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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
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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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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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
- C02F1/76—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens
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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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/04—Oxidation reduction potential [ORP]
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Abstract
The invention discloses a landfill leachate stock solution pretreatment method and a system for disc-tube reverse osmosis treatment, which comprises the following steps: step 1: adding a sodium hypochlorite solution into the landfill leachate stock solution; step 2: adding a PAC solution into the effluent water obtained in the step 1; and step 3: adding a PAM solution into the water discharged in the step (2), enabling the sediment at the bottom to enter a sediment compression treatment unit, and enabling the supernatant to enter the next step; and 4, step 4: adding a sodium sulfite solution to the supernatant; and 5: and (4) carrying out sand filtration treatment on the effluent obtained in the step (4). The invention comprises various targeted processing units and corresponding monitoring and pump systems, and can effectively remove various substances which affect the subsequent disc-tube type reverse osmosis system; through the monitoring to landfill leachate stoste, can be according to the change of landfill leachate raw water, change the input volume of each medicament, make this pretreatment systems can work normally under the condition of the landfill leachate quality of water fluctuation of broad.
Description
Technical Field
The invention relates to the technical field of landfill leachate stock solution treatment, in particular to a landfill leachate stock solution treatment method and system for disc-tube reverse osmosis treatment.
Background
The disc-tube reverse osmosis is widely applied to the treatment process of salt water, landfill leachate and various industrial wastewater. In the process of treating raw water of landfill leachate of a refuse landfill, the disc-tube reverse osmosis can be directly used for treating the raw water of the landfill leachate due to the fact that the disc-tube reverse osmosis can resist higher pressure and has stronger anti-pollution performance. The direct landfill leachate stoste of dish tubular reverse osmosis is handled, the various impurity that contain in the landfill leachate stoste all exists, not effectively get rid of, this part colloid and suspended solid get into in the dish tubular reverse osmosis system, often can block up the waste water passageway, influence dish tubular reverse osmosis system's normal operating, lead to dish tubular reverse osmosis system direct treatment landfill leachate stoste in-process, the shut down phenomenon that takes place increases, the circumstances such as the water yield decline in the operation process, direct influence handles the efficiency.
At present, the method for pretreating the garbage leachate entering the drop tube type reverse osmosis by adopting an anaerobic method, an adsorption method, an aeration method and the like has certain limitations. An anaerobic method is adopted to treat organic matters, and the treated object is single; an adsorption method is adopted to mainly remove heavy metal ions in the landfill leachate and effectively remove other pollutants; the method is characterized in that the aeration mode is adopted to remove sulfide in the landfill leachate stock solution, and the sulfide is converted into sulfur monomers in fine particles through aeration and is difficult to be effectively removed.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a method and a system for treating raw garbage percolate for disc-tube reverse osmosis treatment, which can solve the problem of influencing the raw garbage percolate for disc-tube reverse osmosis treatment.
In order to achieve the purpose, the invention adopts the following technical scheme:
the landfill leachate stock solution pretreatment method for the disc-tube reverse osmosis treatment comprises the following steps:
step 1: adding a sodium hypochlorite solution into the landfill leachate stock solution in the aeration stirring process to remove colloids, bacteria and bacterial secretion in the landfill leachate stock solution;
step 2: adding polyaluminium chloride (PAC) solution into the water effluent from the step (1) which still contains more micro suspended matters, and coagulating the micro particles in the landfill leachate stock solution by utilizing the coagulation effect of the PAC to form larger particles;
and step 3: adding a Polyacrylamide (PAM) solution into the effluent obtained in the step (2) to further coagulate and precipitate flocs in the wastewater, allowing the bottom precipitate to enter a precipitate compression treatment unit, and allowing the supernatant to enter the next step;
and 4, step 4: and adding a sodium sulfite solution into the supernatant under the condition of aeration stirring, and adjusting the ORP value in the landfill leachate to be less than 100 mv.
And 5: and (4) performing sand filtration treatment on the effluent obtained in the step (4) to remove micro suspended matters in the wastewater, so that the landfill leachate stock solution enters the disc-tube reverse osmosis system after reaching the condition of entering the disc-tube reverse osmosis system for treatment.
Further, the landfill leachate stock solution is landfill leachate stock solution, and the index range of the landfill leachate stock solution is as follows: COD: 1000-10000 mg/L, TDS: less than 20000mg/L, ammonia nitrogen: 800-4000 mg/L, SS 500-1500 mg/L, pH: 6-9.
Further, in the step 1, the sodium hypochlorite solution is industrial sodium hypochlorite, and the content of available chlorine is 10% -13%.
Furthermore, the water discharged in the step 1 is [. Cl ]. gtoreq.0.3 mg/L.
Further, in the step 2, the concentration of the PAC solution is 10%, and the PAC solution is added under the aeration stirring stateThe amount of the organic solvent is 50 to 200g/m3。
Further, in the step 3, the concentration of the PAM solution is 1-5 per mill PAM, and the adding amount of the PAM solution is 0.5-2L/m3. The dosage of the medicament changes with the change of water quality.
Furthermore, the ORP value of the effluent of the step 4 is below-100 mv.
Furthermore, the particle size of quartz sand adopted in the sand filtration treatment in the step 5 is 0.5-1.2 mm, the non-uniformity coefficient is 2, the SS of effluent in the step 5 is less than 30mg/L, and the particle size of suspended matters is less than 5 mu m.
The landfill leachate stock solution pretreatment system for disc-tube reverse osmosis treatment based on the method comprises a sodium hypochlorite treatment unit, a PAC condensation treatment unit, a PAM flocculation treatment unit, a sodium sulfite treatment unit and a sand filtration treatment unit which are sequentially connected.
Further, the sodium hypochlorite treatment unit is provided with ORP on-line monitoring to monitor the amount of sodium hypochlorite solution added into the landfill leachate stock solution and the corresponding oxidation degree.
Furthermore, the PAC coagulation treatment unit adopts a metering pump to feed the polyaluminium chloride solution, and the polyaluminium chloride solution and the treatment capacity of the landfill leachate stock solution form a certain proportion, so that the flocs in the landfill leachate are in a good flocculation state and have good settling property.
Further, the PAM flocculation treatment unit adopts a metering pump to feed a polyacrylamide solution, and the polyacrylamide solution and the fed polyaluminium chloride solution are fed according to the proportion of 0.002-0.010; and after polyacrylamide is added, a sedimentation tank is arranged, so that the coagulation flocculation sediment is conveniently removed, and the ORP value of the treated landfill leachate is less than-100 mv.
Further, the sodium sulfite treatment unit is provided with an oxidation-reduction potential detector for monitoring the change of the oxidation-reduction property in the raw water of the landfill leachate; and determining the adding amount of the sodium sulfite solution according to the change of the oxidation-reduction potential in the landfill leachate stock solution.
Furthermore, in the pretreatment process of the raw water of the landfill leachate, centrifugal pumps are adopted among the treatment units to convey the raw water of the landfill leachate.
Has the advantages that: the invention comprises various targeted treatment unit combined processes, effectively removes various substances which influence a disc-tube reverse osmosis system in the raw water of the landfill leachate, and realizes the stable application of the disc-tube reverse osmosis process in the field of raw water treatment of the landfill leachate.
Drawings
FIG. 1 is a schematic view of the flow structure of the present invention.
Detailed Description
The technical solution and the advantages of the present invention will be described in detail with reference to the following examples.
Example 1:
the method is adopted to treat leachate raw water of a certain refuse landfill, wherein COD is 6000-8000 mg/L, and NH is3-N is 1500-2000 mg/L, SS is 500-1000 mg/L; after the waste water passes through the sodium hypochlorite treatment unit, the adding amount of sodium hypochlorite is adjusted to control the content of [ Cl ] in the raw water effluent of the landfill leachate]Not less than 0.3 mg/L; passing the effluent through a PAC condensation treatment unit (PAC dosage is 50-200 g/m)3The reaction time is approximately 20min), and the dosage of a PAM flocculation treatment unit (1 to 5 thousandths of PAM medicament is controlled to be 0.5 to 1L/m3The reaction time is approximately equal to 20min), SS in the effluent is reduced to be less than or equal to 50mg/L, and the raw liquor of the landfill leachate becomes clearer; passing through a sand filter (the sand filter system performs back washing once every 10 d) with the diameter of quartz sand grains generally being 0.5-1.0 mm, and allowing landfill leachate raw water SS in the effluent to be less than 30mg/L and enter a disc tube type reverse osmosis system; the treated raw water of the landfill leachate enters a disc tube type reverse osmosis system for treatment, the cleaning period of the system is increased to 15 d/time, and the system is stable in operation.
Example 2:
the method is adopted to treat leachate raw water of a certain refuse landfill, wherein COD is 4000-6000 mg/L and NH3-N is 1000-1500 mg/L, SS is 500-700 mg/L, including black colloidal matter; after the waste water is oxidized by the sodium hypochlorite treatment unit, black colloid substances are oxidized and removed, and the effluent of raw garbage percolate raw water is controlled to have Cl]About 0.5 mg/L; passing the effluent through a PAC condensation treatment unit (PAC adding amount is 50-100 g/m)3The reaction time is approximately 15min), and the dosage of a PAM flocculation treatment unit (1 to 5 thousandths of PAM medicament is controlled to be 0.5 to 0.8L/m3The reaction time is approximately equal to 15min), SS in the effluent is reduced to be less than or equal to 40mg/L, SS is less than 25mg/L after raw water of the landfill leachate is discharged through a sand filter, and the water quality is clear; the raw water of the landfill leachate enters a disc tube type reverse osmosis system after being pretreated, the system stably and normally operates, the water production rate of the system is increased from 70% to 75%, and meanwhile, the effluent reaches the standard 2 in the landfill pollution control standard (GB 16889-2008).
Example 3:
the method of the invention is adopted to treat leachate stock solution of certain refuse landfill, wherein COD is 7500-10000 mg/L and NH3-N is 1500-3000 mg/L, SS is 700-1500 mg/L; after the raw garbage leachate is oxidized by the sodium hypochlorite treatment unit, the odor in the raw water is removed to a certain extent, and the odor in the raw garbage leachate is maintained]Approximately equal to 0.5mg/L and NH in raw water3N is reduced to 1300-2500 mg/L; the effluent of the sodium hypochlorite treatment unit passes through a PAC condensation treatment unit (the PAC addition amount is 100-200 g/m)3The reaction time is about 30min), and the dosage of the PAM flocculation treatment unit (1 to 5 thousandths of PAM medicament is controlled to be 1.0 to 2.0L/m3The reaction time is approximately equal to 30min), the SS in the effluent is reduced to be less than or equal to 60mg/L, and after the effluent passes through a sand filter, the SS of the raw water of the landfill leachate is less than 30mg/L after the effluent passes through the sand filter; the raw water of the landfill leachate enters the disc tube type reverse osmosis system after being pretreated, the system runs stably and normally, the maintenance frequency is greatly reduced, meanwhile, the cleaning period of the system is reduced from 6-7 d/time to 13-15 d/time, and the water yield of the system reaches 70% -75%.
Claims (10)
1. The landfill leachate stock solution pretreatment method for disc-tube reverse osmosis treatment is characterized by comprising the following steps of:
step 1: adding a sodium hypochlorite solution into the landfill leachate stock solution, and removing colloids, bacteria and bacterial secretion in the landfill leachate stock solution;
step 2: adding PAC solution into the effluent water obtained in the step 1 to enable flocs in the wastewater to be coagulated into larger flocs;
and step 3: adding a PAM solution into the effluent obtained in the step (2) to further coagulate and precipitate flocs in the wastewater, allowing the bottom precipitate to enter a precipitate compression treatment unit, and allowing the supernatant to enter the next step;
and 4, step 4: adding a sodium sulfite solution into the supernatant to remove oxidizing substances in the wastewater and maintain the ORP value of the wastewater less than-100 mv;
and 5: and (4) carrying out sand filtration treatment on the effluent obtained in the step (4) to remove micro suspended matters in the wastewater, and enabling the wastewater to enter a disc tube type reverse osmosis system.
2. The method of claim 1, wherein the landfill leachate stock solution is landfill leachate stock solution, and the landfill leachate stock solution has an index range of: COD: 1000-10000 mg/L, TDS: less than 20000mg/L, ammonia nitrogen: 800-4000 mg/L, SS 500-1500 mg/L, pH: 6-9.
3. The method for pretreating landfill leachate stock solution for disc-tube reverse osmosis treatment according to claim 1, wherein in the step 1, the sodium hypochlorite solution is industrial sodium hypochlorite, and the available chlorine content is 10-13%.
4. The method for pretreating landfill leachate stock solution for disc-tube reverse osmosis treatment according to claim 1, wherein the content of active chlorine in the wastewater in step 1 is not less than 0.3mg/L after sodium hypochlorite preoxidation.
5. The method for pretreating landfill leachate stock solution for disc-tube reverse osmosis treatment according to claim 1, wherein in the step 2, the concentration of the PAC solution is 10%, and the adding amount of the PAC solution is 50-200 g/m under the aeration stirring state3。
6. The landfill leachate stock solution pretreatment method for disc-tube reverse osmosis treatment as claimed in claim 1, wherein in step 3, the concentration of the PAM solution is 1-5% PAM, and the dosage of the PAM solution is 0 under the aeration stirring state.5～2L/m3。
7. The method for pretreating landfill leachate stock solution for disc-tube reverse osmosis treatment according to claim 1, wherein the ORP value of effluent from step 4 is-100 mv or less.
8. The method for pretreating landfill leachate stock solution for disc-tube reverse osmosis treatment according to claim 1, wherein the sand filtration treatment in step 5 adopts quartz sand with a particle size of 0.5-1.2 mm and a non-uniformity coefficient of 2, the SS of the effluent from step 5 is less than 30mg/L, and the particle size of suspended matters is less than 5 μm.
9. The landfill leachate stock solution pretreatment system for the disc-tube reverse osmosis treatment based on the method of claim 1, which is characterized by comprising a sodium hypochlorite treatment unit, a PAC coagulation treatment unit, a PAM flocculation treatment unit, a sodium sulfite treatment unit and a sand filtration treatment unit which are connected in sequence.
10. The system of claim 9, wherein the sodium sulfite treatment unit comprises an ORP on-line monitor and a sodium sulfite dosing pump, and when the ORP detection in the sodium sulfite treatment unit indicates that the ORP detection is greater than or equal to 100mv, the sodium sulfite dosing pump is turned on to pump a sodium sulfite solution to the sodium sulfite treatment unit; when the ORP detection of the sodium sulfite treatment unit shows that the ORP value is less than 100mv, the sodium sulfite solution feeding pump is closed, the ORP detection and the sodium sulfite feeding pump are linked in the above mode, and the ORP value of the treated landfill leachate is ensured to be less than-100 mv.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005125152A (en) * | 2003-10-21 | 2005-05-19 | Kurita Water Ind Ltd | Water treatment method and water treatment apparatus |
| US20070003370A1 (en) * | 2005-07-04 | 2007-01-04 | Liao Zhi Min | A method for treating landfill leachate |
| CN108975640A (en) * | 2018-09-27 | 2018-12-11 | 山东理工大学 | A kind of high-efficient treatment method of rubbish leachate |
| CN109928476A (en) * | 2019-04-26 | 2019-06-25 | 中创水务科技环保(广东)有限公司 | A kind of landfill leachate pretreatment system and its technique |
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- 2020-07-09 CN CN202010657778.5A patent/CN111777223A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005125152A (en) * | 2003-10-21 | 2005-05-19 | Kurita Water Ind Ltd | Water treatment method and water treatment apparatus |
| US20070003370A1 (en) * | 2005-07-04 | 2007-01-04 | Liao Zhi Min | A method for treating landfill leachate |
| CN108975640A (en) * | 2018-09-27 | 2018-12-11 | 山东理工大学 | A kind of high-efficient treatment method of rubbish leachate |
| CN109928476A (en) * | 2019-04-26 | 2019-06-25 | 中创水务科技环保(广东)有限公司 | A kind of landfill leachate pretreatment system and its technique |
Non-Patent Citations (2)
| Title |
|---|
| 周柏青: "《全膜水处理技术》", 31 January 2006, 中国电力出版社 * |
| 巩耀武等: "《火力发电厂化学水处理实用技术》", 31 August 2006, 中国电力出版社 * |
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