CN113087318A - Advanced treatment method for landfill leachate - Google Patents

Advanced treatment method for landfill leachate Download PDF

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Publication number
CN113087318A
CN113087318A CN202110543361.0A CN202110543361A CN113087318A CN 113087318 A CN113087318 A CN 113087318A CN 202110543361 A CN202110543361 A CN 202110543361A CN 113087318 A CN113087318 A CN 113087318A
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China
Prior art keywords
concentrated solution
landfill leachate
nanofiltration
effluent
cod
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CN202110543361.0A
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Chinese (zh)
Inventor
陈神剑
鲍习峰
刘矿洲
李光磊
陈祥宏
韩彦涛
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Jiangsu Zhongpeng Environmental Protection Group Co ltd
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Jiangsu Zhongpeng Environmental Protection Group Co ltd
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Priority to CN202110543361.0A priority Critical patent/CN113087318A/en
Publication of CN113087318A publication Critical patent/CN113087318A/en
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09B—DISPOSAL OF SOLID WASTE
    • B09B1/00—Dumping solid waste
    • B09B1/004—Covering of dumping sites
    • 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
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • 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
    • 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
    • C02F1/70—Treatment of water, waste water, or sewage by reduction
    • 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
    • C02F1/722—Oxidation by peroxides
    • 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
    • C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
    • 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
    • C02F2001/007—Processes including a sedimentation step
    • 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
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/28—Anaerobic digestion processes
    • C02F3/2826—Anaerobic digestion processes using anaerobic filters

Abstract

The invention discloses a deep treatment method of landfill leachate, which is characterized in that COD (chemical oxygen demand) in nanofiltration concentrated solution/MBR effluent is treated by a reduction precipitation method and a ZP (zero-pressure) electrode electrochemical combination technology, the treated nanofiltration concentrated solution and the nanofiltration effluent are combined or the treated MBR effluent is subjected to an autoxidation filter to remove total nitrogen, and finally zero emission of the concentrated solution is realized.

Description

Advanced treatment method for landfill leachate
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a method for deeply treating landfill leachate by using a reduction precipitation method and a ZP electrode electrochemical method.
Background
The landfill leachate refers to high-concentration organic wastewater generated by landfill treatment of garbage, solid waste under the biological, chemical and physical actions due to leaching of atmospheric precipitation, soaking of surface water and underground water and the like. COD and NH in landfill leachate3-N, TN, TP, heavy metals, inorganic salts, etcHigh in component content, relatively poor in biodegradability, complex in component content and difficult to process. Generally, three-stage treatment processes of pretreatment, biochemical treatment and advanced treatment are adopted.
At present, nanofiltration and reverse osmosis processes are generally adopted for advanced treatment of landfill leachate, a large amount of concentrated solution is generated by the two membrane treatment processes, and reverse osmosis is mainly used for effectively removing TN in water. The nanofiltration concentrated solution has complex components, high salt content and poor biodegradability, and is treated by adopting a physical and chemical method mostly, the common physical and chemical methods comprise evaporative crystallization, advanced oxidation and the like, the evaporative crystallization cost is high, and the single advanced oxidation hardly reaches the emission standard. Therefore, the method explores a low-cost and high-efficiency landfill leachate advanced treatment technology and completely solves the problem of landfill leachate concentrated solution.
Disclosure of Invention
Aiming at the problems, the invention provides a deep treatment method of landfill leachate, which is characterized in that COD in nanofiltration concentrated solution/MBR effluent is treated by a reduction precipitation method and a ZP electrode electrochemical combination technology, the treated nanofiltration concentrated solution and the nanofiltration effluent are combined or the treated MBR effluent is subjected to a self-oxygen denitrification filter to remove total nitrogen, and finally the zero emission of the concentrated solution is realized.
In order to realize the technical scheme, the invention provides a landfill leachate advanced treatment method, which comprises the following steps:
the method comprises the following steps: firstly, FeSO is put into nanofiltration concentrated solution or MBR effluent of landfill leachate4·7H2O、H2O2Adding fly ash for flocculation after full reaction to remove most of COD in water;
step two: carrying out reduction precipitation treatment on nanofiltration concentrated solution or MBR effluent to separate mud from water;
step three: after the sludge and water of the nanofiltration concentrated solution or MBR effluent are separated, taking supernatant and carrying out electrolytic treatment on the supernatant by using a ZP electrode to further reduce COD in the water so as to reach the discharge standard;
step four: and combining the treated nanofiltration concentrated solution with nanofiltration effluent or removing total nitrogen from the treated MBR effluent through a self-oxygen denitrification filter, and finally realizing zero emission of the concentrated solution.
In a further improvement, in step two, the H used for the precipitation treatment is reduced2O2The mass concentration is determined according to the COD of the nanofiltration concentrate or the MBR effluent, H2O2The mass concentration and the COD ratio are 1:2-1:0.5, n (Fe)2+):n(H2O2) 1:3-1:7, from which 27.5% of hydrogen peroxide and FeSO were determined4·7H2And adding amount of O.
The further improvement is that in the second step, coagulant aids are added in the reduction precipitation treatment, the coagulant aids are fly ash, and the adding amount of the fly ash is 1000-5000 mg/l.
The further improvement is that in the second step, the nanofiltration concentrated solution or MBR effluent is stirred during reduction precipitation treatment, the stirring time is 20-40min, then the stirring is carried out for 10min after the fly ash is added, and finally precipitation is carried out for 3.5 h.
The further improvement is that in the third step, ZP electrode direct current is adopted to electrolyze the supernatant, and the electrolysis time is 2-30 min.
The ZP electrode is obtained by performing surface modification treatment on a Ti/RuO2 & IrO2 polar plate by using oxalic acid, citric acid and ethylene glycol.
The invention has the advantages that
1. The impact load resistance is strong. The concentrated solution has complex components and high pollutant concentration, and the invention can adjust the operation parameters in due time according to different water quality and water quantity conditions, such as adjusting H according to the change of COD2O2，FeSO4·7H2The addition of O or the proper adjustment of the electrolysis time can better ensure the effluent quality without the risk of excessive COD.
2. The treatment cost is low, the method is suitable for large-scale popularization and replication, the adopted reduction precipitation method and the ZP electrode electrolysis method are simple in process flow, the equipment is convenient to operate and install, the investment and the operation cost are low, most high-concentration pollutants in the concentrated solution/MBR effluent are degraded through the reduction precipitation method, the treatment cost is controlled through controlling the dosage of the reduction precipitation method, the cost is low, the electrolysis time of the concentrated solution/MBR effluent treated by the reduction precipitation method can be effectively shortened through the ZP electrode electrolysis method, the operation cost is fully reduced, the treatment cost of the concentrated solution can be controlled to be about 30 yuan/ton, and the treatment cost of the MBR effluent can be controlled to be about 5 yuan/ton.
Drawings
FIG. 1 is a flow chart of the present invention.
Detailed Description
In order to further understand the present invention, the following detailed description will be made with reference to the following examples, which are only used for explaining the present invention and are not to be construed as limiting the scope of the present invention.
According to the illustration in fig. 1, the embodiment provides a method for advanced treatment of landfill leachate, which comprises the following steps:
the method comprises the following steps: firstly, FeSO is put into nanofiltration concentrated solution or MBR effluent of landfill leachate4·7H2O、H2O2Adding fly ash for flocculation after full reaction to remove most of COD in water;
step two: carrying out reduction precipitation treatment on nanofiltration concentrated solution or MBR effluent to separate mud from water;
step three: after the sludge and water of the nanofiltration concentrated solution or MBR effluent are separated, taking supernatant and carrying out electrolytic treatment on the supernatant by using a ZP electrode to further reduce COD in the water so as to reach the discharge standard;
step four: and combining the treated nanofiltration concentrated solution with nanofiltration effluent or removing total nitrogen from the treated MBR effluent through a self-oxygen denitrification filter, and finally realizing zero emission of the concentrated solution.
In step two, the H used for the precipitation treatment is reduced2O2The mass concentration is determined according to the COD of the nanofiltration concentrate or the MBR effluent, H2O2The mass concentration and the COD ratio are 1:2-1:0.5, n (Fe)2+):n(H2O2) 1:3-1:7, from which 27.5% of hydrogen peroxide and FeSO were determined4·7H2And adding amount of O.
In the second step, a coagulant aid is added in the reduction precipitation treatment, wherein the coagulant aid is fly ash, and the adding amount of the fly ash is 1000-5000 mg/l.
In the second step, the nanofiltration concentrated solution or MBR effluent is stirred during reduction precipitation treatment for 20-40min, then stirred for 10min after adding the fly ash, and finally precipitated for 3.5 h.
In the third step, ZP electrode is adopted to electrolyze the supernatant with direct current for 2-30 min.
The ZP electrode is obtained by performing surface modification treatment on a Ti/RuO2 IrO2 polar plate by using oxalic acid, citric acid and ethylene glycol.
The reduction precipitation treatment method comprises the step of adding FeSO with a certain proportion into nanofiltration concentrated solution/MBR effluent water in sequence4·7H2O, hydrogen peroxide, H2O2With Fe2+Reaction to form Fe3+Has strong oxidizability with OH and OH, takes OH as the starting point of oxidation chain reaction, takes other active oxygen as chain reaction nodes, oxidizes macromolecular groups in water into micromolecules, and oxidizes the micromolecules into water and carbon dioxide, and simultaneously Fe2+Is oxidized into Fe3+Has a certain flocculation effect, Fe3+Hydrolysis to form Fe (OH)3The colloid has good net-catching effect, thereby realizing the removal of pollutants in the wastewater and reducing the chroma and COD of the wastewater; under the condition of direct current applied by a ZP electrode, pollutants in water are subjected to redox reaction at the positive electrode and the negative electrode to be converted into harmless substances to purify the wastewater by an electrochemical method, wherein the ZP electrode is a special electrode modified by citric acid and ethylene glycol, has extremely high oxygen evolution potential, can directly oxidize and decompose organic matters, can efficiently generate active groups to indirectly oxidize the organic matters, reduces the electrode oxygen evolution and electrode consumption, and achieves the purposes of decontamination, disinfection, sterilization and decoloration.
Carry out two
The embodiment provides a landfill leachate advanced treatment method, which combines a reduction precipitation method and a ZP electrode electrolysis technology.
The leachate nanofiltration concentrated solution of a certain refuse landfill has COD of 1500 mg/l.
The technique provided in this example was used to feed the concentrateThe nanofiltration concentrated solution firstly enters a reduction precipitation unit to be treated according to the proportion of n (Fe)2+):n(H2O2) FeSO is added in sequence according to the proportion of 1:34·7H2O4.08g/l，27.5％H2O25.45ml/l, stirring for 20min to fully react, then adding 1g/l of fly ash into the wastewater, stirring for 10min, standing for 3.5h, feeding the reduced and precipitated effluent into an electrolysis unit, electrolyzing the wastewater by an electrolysis bath under the condition of externally applying direct current, wherein the distance between a polar plate is 5cm, the electrolysis time is 5min, organic matters in the wastewater are oxidized and decomposed, and COD is degraded to 98mg/l, so that the standard discharge is realized.
EXAMPLE III
The effluent of the landfill leachate MBR of a certain landfill site is COD300 mg/l.
The concentrated solution is treated by adopting the technology provided by the embodiment, and the nanofiltration concentrated solution firstly enters a reduction precipitation unit according to the proportion of n (Fe)2+):n(H2O2) FeSO is added in sequence according to the proportion of 1:34·7H2O1.24g/l，27.5％H2O21.64ml/l, stirring for 20min to fully react, then adding 1g/l of fly ash into the wastewater, stirring for 10min, standing for 3.5h, feeding the reduced and precipitated effluent into an electrolysis unit, electrolyzing the wastewater by an electrolysis bath under the condition of externally applying direct current, wherein the distance between a polar plate is 5cm, the electrolysis time is 2min, organic matters in the wastewater are oxidized and decomposed, COD is degraded to 76mg/l, and the standard discharge is realized.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (6)

1. The advanced treatment method of the landfill leachate is characterized by comprising the following steps:
step one: firstly, FeSO is put into nanofiltration concentrated solution or MBR effluent of landfill leachate4·7H2O、H2O2Adding fly ash for flocculation after full reaction to remove most of COD in water;
step two: carrying out reduction precipitation treatment on nanofiltration concentrated solution or MBR effluent to separate mud from water;
step three: after the sludge and water of the nanofiltration concentrated solution or MBR effluent are separated, taking supernatant and carrying out electrolytic treatment on the supernatant by using a ZP electrode to further reduce COD in the water so as to reach the discharge standard;
step four: and combining the treated nanofiltration concentrated solution with nanofiltration effluent or removing total nitrogen from the treated MBR effluent through a self-oxygen denitrification filter, and finally realizing zero emission of the concentrated solution.
2. The advanced treatment method for landfill leachate according to claim 1, wherein in step two, H used in reduction precipitation treatment is used2O2The mass concentration is determined according to the COD of the nanofiltration concentrate or the MBR effluent, H2O2The mass concentration and the COD ratio are 1:2-1:0.5, n (Fe)2+):n(H2O2) 1:3-1:7, from which 27.5% of hydrogen peroxide and FeSO were determined4·7H2And adding amount of O.
3. The method as claimed in claim 2, wherein in the second step, coagulant aid is added during the reduction precipitation treatment, the coagulant aid is fly ash, and the addition amount of the fly ash is 1000-5000 mg/l.
4. The advanced treatment method for landfill leachate according to claim 2, wherein in the second step, the nanofiltration concentrate or MBR effluent is stirred during the reduction precipitation treatment for 20-40min, then stirred for 10min after the fly ash is added, and finally precipitated for 3.5 h.
5. The advanced treatment method for landfill leachate according to claim 1, wherein in step three, ZP electrode direct current is used to electrolyze the supernatant for 2-30 min.
6. The advanced treatment method for landfill leachate according to claim 5, wherein the ZP electrode is obtained by performing surface modification treatment on a Ti/RuO 2-IrO 2 polar plate by using oxalic acid, citric acid and ethylene glycol.
CN202110543361.0A 2021-05-19 2021-05-19 Advanced treatment method for landfill leachate Pending CN113087318A (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN203715425U (en) * 2014-01-21 2014-07-16 中钢集团武汉安全环保研究院有限公司 Equipment for treating RO (reverse osmosis) concentrated liquid by pulse electrolysis
CN105923850A (en) * 2016-05-17 2016-09-07 浙江工商大学 Treatment technology of refuse leachate membrane concentration liquid
CN107540135A (en) * 2017-10-17 2018-01-05 中国科学院城市环境研究所 A kind of safe and efficient percolate nanofiltration concentrate processing group technology
CN108996821A (en) * 2018-07-26 2018-12-14 广东中微环保生物科技有限公司 A kind of processing system and processing method of landfill leachate
CN111718040A (en) * 2020-06-09 2020-09-29 上海老港废弃物处置有限公司 Method for preparing deodorant by electrolyzing concentrated solution of nanofiltration percolate of garbage

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN203715425U (en) * 2014-01-21 2014-07-16 中钢集团武汉安全环保研究院有限公司 Equipment for treating RO (reverse osmosis) concentrated liquid by pulse electrolysis
CN105923850A (en) * 2016-05-17 2016-09-07 浙江工商大学 Treatment technology of refuse leachate membrane concentration liquid
CN107540135A (en) * 2017-10-17 2018-01-05 中国科学院城市环境研究所 A kind of safe and efficient percolate nanofiltration concentrate processing group technology
CN108996821A (en) * 2018-07-26 2018-12-14 广东中微环保生物科技有限公司 A kind of processing system and processing method of landfill leachate
CN111718040A (en) * 2020-06-09 2020-09-29 上海老港废弃物处置有限公司 Method for preparing deodorant by electrolyzing concentrated solution of nanofiltration percolate of garbage

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Application publication date: 20210709

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