CN112875962A - Method for treating percolate by evaporation and membrane filtration - Google Patents

Method for treating percolate by evaporation and membrane filtration Download PDF

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CN112875962A
CN112875962A CN202110097020.5A CN202110097020A CN112875962A CN 112875962 A CN112875962 A CN 112875962A CN 202110097020 A CN202110097020 A CN 202110097020A CN 112875962 A CN112875962 A CN 112875962A
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treatment
evaporation
percolate
condensate
filtrate
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王智健
柯鲁靖
王仁和
朱怡桦
邹恩特
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Shandong Zhongneng Environmental Protection Technology Co ltd
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Shandong Zhongneng Environmental Protection Technology Co ltd
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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
    • 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
    • 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
    • C02F1/02—Treatment of water, waste water, or sewage by heating
    • C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
    • 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
    • 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
    • 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
    • C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • 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
    • C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00—Apparatus for treatment of water, waste water or sewage
    • C02F2201/78—Details relating to ozone treatment devices
    • C02F2201/782—Ozone generators
    • 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
    • C02F2209/05—Conductivity or salinity
    • 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
    • C02F2209/06—Controlling or monitoring parameters in water treatment pH
    • 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
    • C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
    • 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
    • C02F2209/10—Solids, e.g. total solids [TS], total suspended solids [TSS] or volatile solids [VS]
    • 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
    • C02F2209/14—NH3-N

Abstract

The invention discloses a method for treating percolate through evaporation and membrane filtration, which comprises the following steps of filtration and pretreatment, evaporation concentration, advanced treatment, ammonia nitrogen removal, wherein the percolate is sequentially treated into discharge liquid and ammonia water which can reach the discharge standard through a mechanical cleaning prefilter, a mechanical recompression evaporator, an ozone catalytic oxidizer and a hollow fiber membrane ammonia nitrogen removal device. The leachate can be effectively treated, the treatment effect is good, and large-scale treatment is carried out.

Description

Method for treating percolate by evaporation and membrane filtration
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a method for treating percolate through evaporation and membrane filtration.
Background
The leachate refers to the liquid containing organic or inorganic components generated by physical, biological and chemical actions such as compaction, fermentation and the like in the process of stacking and burying the garbage and simultaneously under the seepage action of precipitation and other external incoming water, and the COD of the leachate of the municipal domestic garbagecrGenerally 15000-30000 mg/L, BOD5NH with the content of 8000-20000 mg/L3The content of N is 1500-3500 mg/L, TP is 70-100 mg/L, TN is 1800-4000 mg/L, and SS is 500-2500 mg/L, if the landfill leachate is directly discharged into the environment without treatment, serious environmental pollution can be caused. In order to protect the environment, it is essential to treat the leachate. When the combined device is matched with a garbage power generation system for treatment, the combined device not only needs to be matched with the garbage power generation system in treatment scale, but also needs to meet the following basic conditions: the water content of the dewatered sludge is not more than 80%, and the sludge is conveyed to an incineration procedure in a sealed disposal mode; COD of treated liquids, e.g. for replenishing recirculated cooling waterCrIt is not preferable to exceed 60 mg/L. But the prior art method is difficult to achieve the treatment standard, and meanwhile, the treatment process is complex, the treatment efficiency is low, and the method is not suitable for large-scale percolate treatment.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a method for treating percolate through evaporation and membrane filtration, which can effectively treat the percolate, has good treatment effect and is used for large-scale treatment.
In order to achieve the above object, the present invention provides a method for treating percolate by evaporation and membrane filtration, comprising the steps of,
step 1, filtering and pretreating, namely filtering the collected percolate, removing blocky solids with the section size larger than 1mm to obtain coarse filter residues and coarse filtrate, adding a coagulant into the coarse filtrate for precipitation, filtering out precipitates to obtain pretreated filtrate and secondary filter residues, wherein abnormal matters remained in the pretreated filtrate are smaller than 100 mu m, and storing the coarse filter residues and the secondary filter residues and then sending the coarse filter residues and the secondary filter residues into a garbage incinerator;
step 2, evaporation concentration, namely adding the pretreated filtrate obtained in the step 1 into a mechanical recompression evaporator, evaporating and concentrating to form primary condensate and primary concentrate, desalting the concentrated primary concentrate and concentrating for the second time to obtain secondary concentrate and secondary condensate, and mixing the primary condensate and the secondary condensate to obtain condensate;
step 3, carrying out advanced treatment, namely feeding the condensate into an ozone catalytic generator for catalysis to form an oxidizing solution, adding a coagulant into the oxidizing solution, simultaneously adding an alkaline substance to adjust the pH value of the oxidizing solution, filtering to obtain a precipitate and a filtrate, wherein the water content of the precipitate is less than 80%, and feeding the precipitate into a garbage incinerator;
and 4, removing ammonia nitrogen, namely adding the filtrate obtained in the step 3 into a hollow fiber membrane ammonia nitrogen removal device to obtain ammonia water and treatment liquid, and detecting the nitrogen content, NH, of the treated liquid ammonia3NH when the N content is not more than 5mg/L3When the-N content is more than 5mg/L, the mixture enters a hollow fiber membrane ammonia nitrogen removal device for repeated treatment until NH is formed3-N content not more than 5 mg/L.
As a further arrangement of the invention, the coagulant is polyacrylamide, polyaluminium chloride, ferric chloride, aluminium sulfate or ferrous sulfate.
As a further configuration of the present invention, the pH of the pre-treatment filtrate in step 1 is set to be greater than 9.
As a further arrangement of the invention, the condensate is also required to be subjected to COD in the step 2Cr、BOD5、NH3N, SS, conductivity and pH value detection.
As a further arrangement of the invention, the step 3 also comprises cooling the condensate to 35-45 ℃, and the ozone in the ozone catalytic generator is more than 25g/m3And (4) setting.
As a further arrangement of the invention, the step 3 also comprises a comparative test of the water quality index of the filtered liquid, including CODCr、BOD5、NH3N, SS, conductivity, pH and colorimetric power.
As a further arrangement of the invention, the alkali in the step 3 is pure sodium hydroxide.
The beneficial effect who so sets up is: the device has simple integral steps, can treat the landfill leachate quickly and efficiently, and can put a precipitating process of a coagulant into the wastewater through coagulation and precipitation so as to ensure that colloidal particles and suspended matters are quickly precipitated or are easier to filter, thereby improving the precipitation efficiency Diffusion and osmosis, while water and non-wetting liquid are effectively separated, with good separation and rapid separation, where the detection of condensate, the detection criteria are shown in table 1,
Figure BDA0002914689280000031
TABLE 1 condensate Water quality index
Through detection, the method can be used for judging the operation stability of the evaporation compression system besides judging whether the condensate meets the subsequent treatment standard or not, ensures the stable use of the whole equipment, further has the detection standard of the oxidizing liquid as shown in the table 2,
Figure BDA0002914689280000032
TABLE 2 quality index of oxidizing solution
Through detection, whether the oxidizing liquid meets the subsequent treatment standard or not can be judged, and the operation stability of the catalytic oxidation of the ozone can be judged, so that the use stability of the whole equipment is ensured.
The mechanical pre-filtering process can select a belt type squeezing filtering mode, a box type filter press or a plate and frame filter press, an evaporation concentration process device mainly comprises a heating chamber, an evaporation chamber, a gas-liquid separator and a vapor compressor, an ozone catalytic oxidation process comprises an air compressor, an oxygen generator, an ozone mixing tower, a hollow fiber membrane removal ammonia nitrogen device mainly comprises a transition tank, a hollow fiber combination device, a sulfuric acid conveying device, an ammonium sulfate treatment device and the like, the equipment is simple, the equipment is favorable for assembly and realization, the device is suitable for large-scale leachate treatment, the treatment power can be effectively improved, and the device has a good use effect.
Drawings
Fig. 1 is a schematic operation flow diagram of an embodiment of the present invention.
Detailed Description
An embodiment of the process of the invention for treating percolate by evaporation and membrane filtration is shown in FIG. 1: comprises the following steps of (a) carrying out,
step 1, filtering and pretreating, namely filtering the collected percolate, removing blocky solids with the section size larger than 1mm to obtain coarse filter residues and coarse filter liquor, adding polyacrylamide into the coarse filter liquor for precipitation, filtering out precipitates to obtain pretreated filtrate and secondary filter residues, setting the pH of the pretreated filtrate to be larger than 9, and storing the coarse filter residues and the secondary filter residues and then sending the coarse filter residues and the secondary filter residues into a garbage incinerator;
step 2, evaporation concentration, namely adding the pretreated filtrate obtained in the step 1 into a mechanical recompression evaporator, evaporating and concentrating to form primary condensate and primary concentrate, desalting the concentrated primary concentrate and concentrating for the second time to obtain secondary concentrate and secondary condensate, mixing the primary condensate and the secondary condensate to obtain condensate, and carrying out COD (chemical oxygen demand) treatment on the condensateCr、BOD5、NH3N, SS, conductivity, pH detection;
step 3, carrying out advanced treatment, cooling the condensate to 35-45 ℃, and feeding the condensate into an ozone catalytic generator to be catalyzed to form an oxidizing solution, wherein the ozone in the ozone catalytic generator is more than 25g/m3Setting, adding polyacrylamide into the oxidation liquid, adding sodium hydroxide purified matter to regulate pH value of the oxidation liquid, filtering to obtain precipitate and filtrate, and performing comparison test of the water quality index of the filtrate, including COD testCr、BOD5、NH3N, SS, conductivity, pH and colorimetric power. The water content of the precipitate is less than 80%, and the precipitate is sent to a garbage incinerator;
and 4, removing ammonia nitrogen, namely adding the filtrate obtained in the step 3 into a hollow fiber membrane ammonia nitrogen removal device to obtain ammonia water and treatment liquid, and detecting the nitrogen content, NH, of the treated liquid ammonia3NH when the N content is not more than 5mg/L3When the-N content is more than 5mg/L, the mixture enters a hollow fiber membrane ammonia nitrogen removal device for repeated treatment until NH is formed3-N content not more than 5 mg/L.
The above example is only one of the preferred embodiments of the present invention, and general changes and substitutions by those skilled in the art within the technical scope of the present invention are included in the protection scope of the present invention.

Claims (7)

1. A method for treating percolate by evaporation and membrane filtration, characterized in that: comprises the following steps of (a) carrying out,
step 1, filtering and pretreating, namely filtering the collected percolate, removing blocky solids with the section size larger than 1mm to obtain coarse filter residues and coarse filtrate, adding a coagulant into the coarse filtrate for precipitation, filtering out precipitates to obtain pretreated filtrate and secondary filter residues, wherein abnormal matters remained in the pretreated filtrate are smaller than 100 mu m, and storing the coarse filter residues and the secondary filter residues and then sending the coarse filter residues and the secondary filter residues into a garbage incinerator;
step 2, evaporation concentration, namely adding the pretreated filtrate obtained in the step 1 into a mechanical recompression evaporator, evaporating and concentrating to form primary condensate and primary concentrate, desalting the primary concentrate and concentrating for the second time to obtain secondary concentrate and secondary condensate, and mixing the primary condensate and the secondary condensate to obtain condensate;
step 3, carrying out advanced treatment, namely feeding the condensate into an ozone catalytic generator for catalysis to form an oxidizing solution, adding a coagulant into the oxidizing solution, simultaneously adding an alkaline substance to adjust the pH value of the oxidizing solution, filtering to obtain a precipitate and a filtrate, wherein the water content of the precipitate is less than 80%, and feeding the precipitate into a garbage incinerator;
and 4, removing ammonia nitrogen, namely adding the filtrate obtained in the step 3 into a hollow fiber membrane ammonia nitrogen removal device to obtain ammonia water and treatment liquid, and detecting the nitrogen content, NH, of the treated liquid ammonia3NH when the N content is not more than 5mg/L3When the-N content is more than 5mg/L, the mixture enters a hollow fiber membrane ammonia nitrogen removal device for repeated treatment until NH is formed3-N content not more than 5 mg/L.
2. The method for the treatment of percolate with evaporation and membrane filtration according to claim 1, characterized in that: the coagulant is polyacrylamide, polyaluminium chloride, ferric chloride, aluminum sulfate or ferrous sulfate.
3. The method for the treatment of percolate with evaporation and membrane filtration according to claim 2, characterized in that: the pH value of the pretreatment filtrate in the step 1 is set to be more than 9.
4. The method for the treatment of percolate with evaporation and membrane filtration according to claim 1, characterized in that: in the step 2, the condensate is also required to be subjected to CODCr、BOD5、NH3N, SS, conductivity and pH value detection.
5. The method for the treatment of percolate with evaporation and membrane filtration according to claim 1, characterized in that: the step 3 also comprises cooling the condensate to 35-45 ℃, wherein the ozone in the ozone catalytic generator is more than 25g/m3And (4) setting.
6. The method for the treatment of percolate with evaporation and membrane filtration according to claim 5, characterized in that: the step 3 also comprises a contrast test of the water quality index of the filtrate, including CODCr、BOD5、NH3N, SS, conductivity, pH and colorimetric power.
7. The method for the treatment of percolate with evaporation and membrane filtration according to claim 5, characterized in that: and in the step 3, the alkaline matter is set as pure sodium hydroxide.
CN202110097020.5A 2021-01-25 2021-01-25 Method for treating percolate by evaporation and membrane filtration Pending CN112875962A (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105800871A (en) * 2016-04-26 2016-07-27 史义 Method for treating refuse leachate membrane-concentrated liquid by using ozone advanced oxidation
US20170050872A1 (en) * 2015-08-20 2017-02-23 Blumetric Environmental Inc. Wastewater treatment system
CN109942043A (en) * 2019-04-26 2019-06-28 中创水务科技环保(广东)有限公司 A kind of percolate treating process and device
CN111847806A (en) * 2020-08-25 2020-10-30 江西绿色盾牌环境工程有限公司 Landfill leachate treatment method and process

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170050872A1 (en) * 2015-08-20 2017-02-23 Blumetric Environmental Inc. Wastewater treatment system
CN105800871A (en) * 2016-04-26 2016-07-27 史义 Method for treating refuse leachate membrane-concentrated liquid by using ozone advanced oxidation
CN109942043A (en) * 2019-04-26 2019-06-28 中创水务科技环保(广东)有限公司 A kind of percolate treating process and device
CN111847806A (en) * 2020-08-25 2020-10-30 江西绿色盾牌环境工程有限公司 Landfill leachate treatment method and process

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Application publication date: 20210601