CN111470729A - Garbage leachate treatment system and method for garbage incineration power plant - Google Patents

Garbage leachate treatment system and method for garbage incineration power plant Download PDF

Info

Publication number
CN111470729A
CN111470729A CN202010332288.8A CN202010332288A CN111470729A CN 111470729 A CN111470729 A CN 111470729A CN 202010332288 A CN202010332288 A CN 202010332288A CN 111470729 A CN111470729 A CN 111470729A
Authority
CN
China
Prior art keywords
treatment
anaerobic
leachate
primary
reactor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202010332288.8A
Other languages
Chinese (zh)
Inventor
王然
郑忆枫
赵剑锋
兰建伟
徐文军
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shenzhen Energy Resource Comprehensive Development Co ltd
Original Assignee
Shenzhen Energy Resource Comprehensive Development Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shenzhen Energy Resource Comprehensive Development Co ltd filed Critical Shenzhen Energy Resource Comprehensive Development Co ltd
Priority to CN202010332288.8A priority Critical patent/CN111470729A/en
Publication of CN111470729A publication Critical patent/CN111470729A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • 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
    • C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
    • 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
    • C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
    • 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
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/16—Nitrogen compounds, e.g. ammonia
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/30—Organic compounds
    • 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
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C02F3/1236—Particular type of activated sludge installations
    • C02F3/1268—Membrane bioreactor systems
    • 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
    • C02F3/286—Anaerobic digestion processes including two or more steps
    • 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
    • C02F3/30—Aerobic and anaerobic processes
    • C02F3/302—Nitrification and denitrification treatment
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
    • C02F5/02—Softening water by precipitation of the hardness
    • C02F5/06—Softening water by precipitation of the hardness using calcium compounds

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
  • Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)

Abstract

The invention discloses a waste leachate treatment system and a method of a waste incineration power plant, wherein the waste leachate treatment system comprises a primary sedimentation tank, a primary anaerobic reactor, a secondary anaerobic reactor, an anaerobic sedimentation tank, a softening reactor, a tubular microfiltration membrane, an ammonia still and a built-in MBR; the primary sedimentation tank, the primary anaerobic reactor, the secondary anaerobic reactor, the anaerobic sedimentation tank, the softening reactor, the tubular microfiltration membrane, the ammonia still and the built-in MBR are sequentially connected according to the circulation treatment direction of the garbage leachate. The invention realizes the standard discharge of the waste leachate by sequentially carrying out primary sedimentation pretreatment, primary anaerobic treatment, secondary anaerobic treatment, hardness-removing softening treatment, an ammonia still and low-load built-in MBR treatment on the waste leachate.

Description

Garbage leachate treatment system and method for garbage incineration power plant
Technical Field
The invention relates to the technical field of waste water treatment, in particular to a waste leachate treatment system and method for a waste incineration power plant.
Background
At present, the national garbage power plants are built like bamboo shoots in spring after rain, the garbage incineration power generation is a mainstream technology for future garbage treatment and is supported by the nation greatly, the garbage leachate is a topic which cannot be bypassed in the garbage incineration power generation technology, and a set of process system with lower investment cost, lower operation cost and stable operation is a goal continuously pursued by the industry.
During the storage, transfer, transportation and stacking of the garbage, various metabolites and moisture are generated due to anaerobic fermentation, organic matter decomposition, rainwater leaching and the like, and high-concentration organic wastewater, namely garbage leachate with extremely complex components is formed.
The components of the waste leachate are complex, the COD concentration is generally about 40000-. The main flow of the leachate treatment process of the current waste incineration power plant mainly comprises the following steps: pretreatment, anaerobic treatment, external MBR (nitrification/denitrification and ultrafiltration system), NF and RO. The process route is a mature process in the industry, but has some defects, such as high investment, high operation cost, large occupied area, high cost of water treatment per ton and the need of power plant for synergistic treatment of membrane concentrated solution. According to the operation experience, the A/O system in the external MBR system has more aeration fans, jet pumps, reflux pumps, defoaming pumps and other equipment, the power consumption of the system in the whole process flow accounts for the highest ratio, the power consumption for nitrification/denitrification operation accounts for 60-80% of the whole power consumption, and the cost accounts for about 50% of the water treatment cost per ton. Meanwhile, after the NF and RO systems are put into operation, about 30 percent of membrane concentrated solution is generated. Because the membrane concentrated solution has the characteristics of high organic matter concentration, high salt content, strong scaling property, complex pollutant components and the like, the difficulty of treating the concentrated solution is quite large, and an economic and reasonable mature treatment process does not exist at home and abroad.
Therefore, in order to reduce the generation of membrane concentrate, reduce the investment cost and reduce the cost of water treatment per ton, the treatment process needs to be improved to replace an external MBR system and a membrane advanced treatment system.
Disclosure of Invention
The invention aims to provide a waste leachate treatment system and a waste leachate treatment method of a waste incineration power plant, which have the advantages of low cost and good treatment effect.
The technical scheme adopted by the invention for solving the technical problems is as follows: the waste leachate treatment system of the waste incineration power plant comprises a primary sedimentation tank, a primary anaerobic reactor and a secondary anaerobic reactor which are connected with a waste leachate in sequence and perform medium-temperature anaerobic treatment on the waste leachate, an anaerobic sedimentation tank, a softening reactor which performs softening treatment on the waste leachate after the anaerobic treatment, a tubular microfiltration membrane which performs filtration treatment on the softened waste leachate, an ammonia distillation tower which performs ammonia distillation treatment on the clear liquid obtained by filtration, and a built-in MBR which performs biochemical treatment and filtration treatment on the clear liquid obtained by ammonia distillation;
the primary sedimentation tank, the primary anaerobic reactor, the secondary anaerobic reactor, the anaerobic sedimentation tank, the softening reactor, the tubular microfiltration membrane, the ammonia still and the built-in MBR are sequentially connected according to the circulation treatment direction of the garbage leachate.
Preferably, the waste leachate treatment system further comprises a basket filter and a self-cleaning filter which are arranged at the front end of the primary sedimentation tank and are used for filtering the waste leachate.
Preferably, the basket filter has a filtration precision of 5mm or 10 mm; the filtering precision of the self-cleaning filter is 1mm or 2 mm.
Preferably, the waste leachate treatment system further comprises an adjusting tank for performing uniform treatment on the waste leachate; the regulating tank is connected between the primary settling tank and the primary anaerobic reactor.
Preferably, the anaerobic reaction temperature of the primary anaerobic reactor and the anaerobic reaction temperature of the secondary anaerobic reactor are both 35-38 ℃.
Preferably, the pore diameter of the microfiltration membrane of the tubular microfiltration membrane is 0.1-0.5 μm.
Preferably, the garbage leachate treatment system further comprises a sludge tank and a sludge dehydration treatment device connected with the sludge tank; the primary sedimentation tank, the primary anaerobic reactor, the secondary anaerobic reactor, the anaerobic sedimentation tank and the built-in MBR are respectively connected with the sludge tank.
Preferably, the landfill leachate treatment system further comprises an emergency nanofiltration device connected to the water outlet end of the built-in MBR, and the emergency nanofiltration device is used for filtering the effluent of the built-in MBR.
The invention also provides a waste leachate treatment method of the waste incineration power plant, which comprises the following steps:
s1, allowing the garbage leachate to enter a primary sedimentation tank for primary sedimentation treatment;
s2, conveying the waste leachate after the primary precipitation treatment to a primary anaerobic reactor for medium-temperature anaerobic treatment to decompose insoluble organic matters in the waste leachate into micromolecular substances;
s3, conveying the garbage leachate after medium-temperature anaerobic treatment to a secondary anaerobic reactor for secondary anaerobic treatment to remove organic matters in the garbage leachate;
s4, conveying the garbage leachate after the secondary anaerobic treatment to an anaerobic sedimentation tank for anaerobic sedimentation treatment;
s5, sending the effluent of the anaerobic sedimentation tank to a softening reactor, adding calcium hydroxide for softening treatment, and adjusting the addition amount of the calcium hydroxide according to the online measured pH value;
s6, conveying the softened waste leachate to a tubular microfiltration membrane, and filtering to remove suspended matters and organic microorganisms in the waste leachate;
s7, conveying the clear liquid obtained after filtration to an ammonia still for ammonia distillation treatment, and removing ammonia nitrogen in the clear liquid;
s8, sending the effluent of the ammonia still to a built-in MBR, and biochemically removing the biochemically available organic matters and performing biological denitrification through denitrification and nitrification.
Preferably, in step S1, the landfill leachate is filtered by sequentially passing through the basket filter and the self-cleaning filter before entering the primary sedimentation tank.
Preferably, in step S2, the primarily precipitated landfill leachate is first conveyed to a regulating tank for homogenization and volume equalization treatment, and then conveyed to the primary anaerobic reactor.
Preferably, the waste leachate treatment method further comprises the following steps:
and S9, filtering the effluent of the built-in MBR through an emergency nanofiltration device, and reducing the organic matter index of the effluent.
The system and the method for treating the waste leachate realize the standard discharge of the waste leachate by sequentially carrying out primary sedimentation pretreatment, primary anaerobic treatment, secondary anaerobic treatment, hardness-removing softening treatment, an ammonia still and low-load built-in MBR treatment on the waste leachate.
The invention has the following advantages:
(1) the ton water investment cost of the whole process is reduced;
(2) the ton water treatment cost of the garbage leachate treatment industry is reduced;
(3) most organic matters are removed in the anaerobic treatment, and a low-load built-in MBR system or a membrane advanced treatment system is adopted, so that the sludge amount is reduced;
(4) the residence time of the low-load built-in MBR biochemical tank is shortened, the volume of the required reactor is reduced, and the floor area and the investment cost of civil engineering and the like are saved;
(5) when the built-in MBR is adopted, the dependence of the system on a membrane advanced treatment system is reduced, and no membrane concentrated solution is generated;
(6) and the ammonia distillation tower is fully utilized to remove ammonia nitrogen.
In addition, the emergency nanofiltration device is used for further filtering the outlet water of the built-in MBR, so that the indexes of the outlet water organic matters reach the discharge standard, and the generation of membrane concentrated solution is reduced to the maximum extent.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
figure 1 is a block diagram of the connections of a waste leachate treatment system according to one embodiment of the present invention.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
The invention relates to a garbage leachate treatment system and a garbage leachate treatment method for a garbage incineration power plant, which are used for treating garbage leachate so as to enable the garbage leachate to reach the discharge standard.
As shown in fig. 1, the waste leachate treatment system of the waste incineration power plant according to an embodiment of the present invention includes a primary sedimentation tank 1, a primary anaerobic reactor 3, a secondary anaerobic reactor 4, an anaerobic sedimentation tank 5, a softening reactor 6, a tubular microfiltration membrane 7, an ammonia still 8, and a built-in MBR (membrane bioreactor) 9, which are connected in sequence in a flow direction of waste leachate.
Wherein, the primary sedimentation tank 1 is connected with the garbage leachate, so that the garbage leachate is subjected to preliminary sedimentation pretreatment. The primary anaerobic reactor 3 and the secondary anaerobic reactor 4 sequentially carry out medium-temperature anaerobic treatment on the waste leachate, the primary anaerobic reactor 3 carries out primary anaerobic reaction, the secondary anaerobic reactor 4 carries out secondary anaerobic treatment, and the anaerobic sedimentation tank 5 is used for carrying out anaerobic sedimentation on the waste leachate after anaerobic treatment in the anaerobic sedimentation tank to reduce the sludge concentration of the effluent. The softening reactor 6 is used for softening the garbage leachate after anaerobic treatment to remove most of hardness. The tubular microfiltration membrane 7 is used for filtering the softened garbage leachate to remove suspended matters and organic microorganisms in the garbage leachate. And the ammonia distillation tower 8 carries out ammonia distillation treatment on the clear liquid obtained by filtering to remove ammonia nitrogen in the clear liquid. The built-in MBR9 performs biochemical treatment and filtration treatment on the clear liquid after ammonia distillation to ensure that the garbage leachate reaches the discharge standard.
The waste leachate treatment system further comprises a basket filter 101 and a self-cleaning filter 102, the basket filter 101 and the self-cleaning filter 102 are arranged at the front end of the primary sedimentation tank 1 according to the circulation direction of the waste leachate, the waste leachate is filtered, and the filtered waste leachate enters the primary sedimentation tank 1 for primary sedimentation to remove larger particulate matters and part of suspended matters in the waste leachate; sludge formed by the sedimentation and accumulation at the bottom in the primary sedimentation tank 1 can be discharged through a power pump.
Alternatively, the basket filter 101 has a filtration precision of 5mm or 10 mm; the self-cleaning filter 102 has a filtration accuracy of 1mm or 2 mm.
In order to stabilize the water quality and water quantity of the waste leachate entering each subsequent treatment unit, the waste leachate treatment system further comprises an adjusting tank 2 for performing uniform treatment on the waste leachate. The adjusting tank 2 is connected between the primary sedimentation tank 1 and the primary anaerobic reactor 3.
The primary anaerobic reactor 3 and the secondary anaerobic reactor 4 realize two-stage anaerobic treatment of the waste leachate. Wherein, in the primary anaerobic reactor 3, the medium-temperature anaerobic environment is used, and the medium-temperature anaerobic reaction temperature is selected to be 35-38 ℃. Through medium-temperature anaerobic treatment, indissolvable organic pollutants in the waste leachate are firstly decomposed into soluble macromolecular substances, then are decomposed into micromolecular organic acids, and finally are decomposed into micromolecular substances such as carbon dioxide, methane, water, ammonia nitrogen, hydrogen sulfide, phosphate, inorganic salt and the like, so that the pollutants are removed. The landfill leachate after the primary anaerobic treatment enters a secondary anaerobic reactor 4 to continue anaerobic reaction, the anaerobic reaction temperature is selected to be 35-38 ℃, and organic matters in the landfill leachate are further removed.
In the two-stage anaerobic treatment, the garbage leachate decomposes most of organic pollutants into small molecular substances under the action of anaerobic microorganisms in an anaerobic environment, so that COD and BOD are reduced. Meanwhile, the anaerobic reactor has a certain removal rate on the hardness, the removal rate can reach about 70%, and the removal of the hardness greatly reduces the dosage of a subsequent treatment unit.
In the above two-stage anaerobic treatment, the hydraulic retention time of the secondary anaerobic reactor 4 is shorter than that of the primary anaerobic reactor 3. The primary anaerobic reactor 3 and the secondary anaerobic reactor 4 may be UASB reactors or IC reactors. In addition, the marsh gas that produces in above-mentioned anaerobic treatment can be collected to the gas storage holder, is burnt burning furnace by the pipeline transport to the power plant and burns, sets up emergent torch simultaneously.
The effluent of the secondary anaerobic reactor 4 enters an anaerobic sedimentation tank 5 (closed), and anaerobic sedimentation is carried out in the anaerobic sedimentation tank, so that the influence of the subsequent treatment process due to the overhigh sludge concentration of the anaerobic effluent is mainly avoided. The sludge formed by the bottom deposition and accumulation in the anaerobic sedimentation tank 5 can be discharged by a power pump.
A central cylinder is arranged in the anaerobic sedimentation tank 5 to form a central water inlet and peripheral water outlet mode, and the bottom of the anaerobic sedimentation tank 5 is arranged in a sludge bucket mode to facilitate sludge discharge.
The inlet end of the softening reactor 6 is connected with the water outlet end of the anaerobic sedimentation tank 5, the effluent of the anaerobic sedimentation tank 5 is connected, and the garbage leachate after anaerobic treatment is softened to remove most of calcium. During the softening treatment, calcium hydroxide (slaked lime) can be added into the softening reactor 6 through an automatic dosing device, and the garbage leachate reacts with the calcium hydroxide to carry out coagulating sedimentation so as to remove most of the hardness in the garbage leachate. The input amount of the calcium hydroxide is adjusted according to the pH value of the waste leachate, and the input amount of the calcium hydroxide can be adjusted by an automatic dosing device according to the conditions of the pH value of the waste leachate and the like, so that the pH value in the softening reactor 6 is adjusted to 11-12. The pH of the softening reactor 6 is monitored on-line by a pH meter 61.
The inlet end of the tubular microfiltration membrane 7 is connected with the water outlet end of the softening reactor 6, the water outlet of the softening reactor 6 is connected, the softened waste leachate is filtered to remove suspended matters and organic microorganisms therein, and the waste leachate is further separated and clarified.
The aperture of the microfiltration membrane of the tubular microfiltration membrane 7 can be 0.1-0.5 μm.
The water outlet end of the tubular microfiltration membrane 7 is connected with an ammonia still 8, and the clear liquid obtained after filtration is conveyed to the ammonia still 8 for ammonia distillation treatment so as to remove ammonia nitrogen therein and remove part of volatile COD.
In clear liquidAmmonia nitrogen, mostly ammonia ions (NH4+) and free ammonia (NH)3) The state of (a) exists and maintains an equilibrium, and the equilibrium relationship between the two is influenced by the pH value. When the pH value is 7, the ammonia nitrogen exists in a state of NH4+, and when the pH value is about 11, the ammonia nitrogen accounts for 90 percent of NH3In the form of free ammonia (NH)3) Easily escaping from the water. In this embodiment, the ammonia still 8 adopts a blowing ammonia stripping tower to promote ammonia to escape from clear liquid, and the ammonia removal rate of the ammonia still 8 can reach more than 95%. In order to avoid secondary pollution caused by the escaped ammonia gas, the escaped ammonia gas is recycled by adopting a pipeline and is sent to a denitration system of the power plant by a pump.
The effluent of the ammonia still 8 is sent to a built-in MBR9, and biochemical organic matters in the effluent are removed by denitrification and nitrification, and biological denitrification is carried out, so that the final effluent reaches the pollution control Standard of municipal solid waste landfill (GB 16889-.
In this embodiment, the built-in MBR9 includes a denitrification tank 91, a nitrification tank 92, and a built-in ultrafiltration membrane device 93, which are connected in sequence. In operation, the mixed liquor in the nitrification tank 92 flows back to the denitrification tank 91 to make the denitrifying bacteria have enough NO3-As an electron acceptor, thereby increasing the denitrification rate. Microbial cells in the built-in MBR9 are separated from water through the built-in ultrafiltration membrane device 93, so that suspended matters, microorganisms and suspended matters related to CODCr are safely retained in the built-in ultrafiltration membrane device 93, and the hydraulic retention time and the sludge retention time are really separated. The residual sludge generated by the built-in ultrafiltration membrane device 93 is discharged into a sludge tank regularly, and the effluent water reaches the standard and is discharged.
The ultrafiltration membrane in the in-line ultrafiltration membrane device 93 may be an in-line submerged plate-type membrane.
Further, the landfill leachate treatment system of the present invention further includes a sludge tank 10 and a sludge dewatering treatment apparatus 11 connected to the sludge tank 10 as necessary. The primary sedimentation tank 1, the primary anaerobic reactor 3, the secondary anaerobic reactor 4, the anaerobic sedimentation tank 5 and the built-in MBR9 are respectively connected with a sludge tank 10, and sediments such as sludge accumulated inside each sludge tank can be conveyed into the sludge tank 10 through a pump and the like. The sludge and other sediments stored in the sludge tank 10 can be further conveyed to a sludge dehydration treatment device 11 for dehydration treatment, the formed dry sludge can be conveyed to a power plant for incineration, and the dehydrated liquid can be returned to the denitrification tank for treatment.
According to the requirement, the landfill leachate treatment system also comprises an emergency nanofiltration device 12 which is connected with the water outlet end of the built-in MBR9 and is used for filtering the effluent of the built-in MBR9, so that the organic matter index of the effluent is reduced, and the effluent is ensured to meet the discharge standard.
The emergency nanofiltration device 12 is specifically connected to the water outlet end of the built-in ultrafiltration membrane device 93. The nanofiltration membrane aperture of the emergency nanofiltration device is 1-10 nm.
Under a small part of conditions, organic matters in the effluent of the built-in MBR9 may exceed the standard, and at the moment, the emergency nanofiltration device 12 is started to ensure that the effluent meets the standard and is discharged. The emergency nanofiltration device 12 is optionally configured to not activate the emergency nanofiltration device 12 when the organic matter indicator of the effluent of the built-in MBR9 meets relevant standards.
The waste leachate treatment method of the waste incineration power plant can be realized by adopting the treatment system, and with reference to fig. 1, the treatment method can comprise the following steps:
s1, the garbage leachate enters the primary sedimentation tank 1 for primary sedimentation treatment.
The preliminary precipitation serves as a pretreatment step to remove precipitable substances therefrom. Sludge formed by the sedimentation and accumulation at the bottom in the primary sedimentation tank 1 can be discharged to a sludge tank 10 through a power pump.
Alternatively, in this embodiment, the waste leachate is filtered, for example, by passing through the basket filter 101 and the self-cleaning filter 102 in sequence, to remove larger particulate matters and part of suspended matters in the waste leachate before entering the primary sedimentation tank 1.
S2, conveying the waste leachate after the primary precipitation treatment to a primary anaerobic reactor 3 for medium-temperature anaerobic treatment, so that the indissolvable organic matters in the waste leachate are decomposed into micromolecular substances, and the COD and BOD of the waste leachate are reduced.
Wherein the temperature of the medium-temperature anaerobic treatment is 35-38 ℃.
Through the medium-temperature anaerobic treatment, the indissolvable organic pollutants in the waste leachate are firstly decomposed into soluble macromolecular substances, then are decomposed into micromolecular organic acids, and finally are decomposed into micromolecular substances such as carbon dioxide, methane, water, ammonia nitrogen, hydrogen sulfide, phosphate, inorganic salt and the like.
Before entering the primary anaerobic reactor 3, the garbage leachate is homogenized and uniformly treated, so that the stable water quality and water quantity of the garbage leachate entering each subsequent treatment unit are ensured. The homogenization and uniform amount treatment can be realized in the adjusting tank 2, and the garbage leachate after the primary precipitation treatment is firstly conveyed into the adjusting tank 2 and then conveyed to the primary anaerobic reactor 3.
S3, conveying the garbage leachate after the medium-temperature anaerobic treatment to a secondary anaerobic reactor 4 for secondary anaerobic treatment to remove organic matters in the garbage leachate.
In the two-stage anaerobic treatment, the garbage leachate decomposes most of organic pollutants into small molecular substances under the action of anaerobic microorganisms in an anaerobic environment, so that COD and BOD are reduced. Meanwhile, the anaerobic reactor has a certain removal rate on the hardness, the removal rate can reach about 70%, and the removal of the hardness greatly reduces the dosage of a subsequent treatment unit.
In the above two-stage anaerobic treatment, the hydraulic retention time of the secondary anaerobic reactor 4 is shorter than that of the primary anaerobic reactor 3. The primary anaerobic reactor 3 and the secondary anaerobic reactor 4 may be UASB reactors or IC reactors. In addition, the marsh gas that produces in above-mentioned anaerobic treatment can be collected to the gas storage holder, is burnt burning furnace by the pipeline transport to the power plant and burns, sets up emergent torch simultaneously.
Sludge formed by the sedimentation and accumulation at the bottom of the primary anaerobic reactor 3 and the secondary anaerobic reactor 4 can be discharged to a sludge tank 10 through a power pump.
And S4, conveying the garbage leachate after the secondary anaerobic treatment to an anaerobic sedimentation tank 5 for anaerobic sedimentation treatment.
The anaerobic sedimentation tank 5 is mainly used for allowing the garbage leachate after the secondary anaerobic treatment to stay and sediment therein, so as to avoid the influence of the subsequent treatment process due to the overhigh concentration of the sludge in the anaerobic effluent. The sludge formed by the bottom sedimentation and accumulation in the anaerobic sedimentation tank 5 can be discharged to a sludge tank 10 through a power pump.
In this embodiment, the anaerobic sedimentation tank 5 is provided with a central cylinder therein to form a central water inlet and peripheral water outlet form, the bottom of the anaerobic sedimentation tank 5 is provided with a sludge hopper form to facilitate sludge discharge, and the sludge can be discharged to the sludge tank 10.
S5, sending the effluent of the anaerobic sedimentation tank 5 to a softening reactor 6, adding calcium hydroxide for softening treatment, and adjusting the addition amount of the calcium hydroxide according to the online measured pH value.
During the softening treatment, calcium hydroxide (slaked lime) can be added into the softening reactor 6 through an automatic dosing device, and the garbage leachate reacts with the calcium hydroxide to carry out coagulating sedimentation so as to remove most of the hardness in the garbage leachate. The input amount of the calcium hydroxide is adjusted according to the pH value of the waste leachate, and the input amount of the calcium hydroxide can be adjusted by an automatic dosing device according to the conditions of the pH value of the waste leachate and the like, so that the pH value in the softening reactor 6 is adjusted to 11-12. The pH of the softening reactor 6 is monitored on-line by a pH meter 61.
And S6, conveying the softened waste leachate to a tubular microfiltration membrane 7, and filtering to remove suspended matters and organic microorganisms in the waste leachate to obtain clear liquid.
Wherein the aperture of the microfiltration membrane of the tubular microfiltration membrane 7 can be 0.5 μm.
And S7, conveying the filtered clear liquid to an ammonia still 8 for ammonia distillation treatment, removing ammonia nitrogen in the clear liquid, and removing part of volatile COD.
Due to ammonia nitrogen in the clear liquid, ammonia ions (NH4+) and free ammonia (NH) are more abundant3) The state of (a) exists and maintains an equilibrium, and the equilibrium relationship between the two is influenced by the pH value. When the pH value is 7, the ammonia nitrogen exists in a state of NH4+, and when the pH value is about 11, the ammonia nitrogen accounts for 90 percent of NH3In the form of free ammonia (NH)3) Easily escaping from the water. Therefore, in this embodiment, the ammonia still 8 adopts a blowing ammonia stripping tower to promote ammonia to escape from the clear liquid, and the removal rate of ammonia nitrogen by the ammonia still 8 can reach more than 95%. In order to avoid secondary pollution caused by the escaped ammonia gas, the escaped ammonia gas is recycled by adopting a pipeline and is sent to a denitration system of the power plant by a pump.
S8, sending the effluent of the ammonia still 8 to a built-in MBR9, biochemically removing the biochemically available organic matters in the effluent through denitrification and nitrification, and performing biological denitrification to ensure that the final effluent reaches the discharge standard.
In the built-in MBR9, sludge formed by precipitation and accumulation in the denitrification tank 91 and the nitrification tank 92 can be discharged to the sludge tank 10 through a power pump and the like.
Further, according to need, the processing method of the present invention further comprises the steps of:
s9, filtering the effluent of the built-in MBR through the emergency nanofiltration device 12, reducing the organic matter index of the effluent, and ensuring that the effluent meets the discharge standard.
In conclusion, the treatment system and the method can reduce the generation of membrane concentrated solution, reduce the investment cost, the treatment cost and the occupied area of the waste incineration power plant for treating the waste leachate per ton of water, and achieve the purposes of reducing the cost and having good treatment effect.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (10)

1. A waste leachate treatment system of a waste incineration power plant is characterized by comprising a primary sedimentation tank, a primary anaerobic reactor and a secondary anaerobic reactor, an anaerobic sedimentation tank, a softening reactor, a tubular microfiltration membrane, an ammonia still and a built-in MBR, wherein the primary sedimentation tank is connected with waste leachate, the primary anaerobic reactor and the secondary anaerobic reactor are used for sequentially carrying out medium-temperature anaerobic treatment on the waste leachate, the softening reactor is used for softening the waste leachate after anaerobic treatment, the tubular microfiltration membrane is used for filtering the softened waste leachate, the ammonia still is used for carrying out ammonia evaporation treatment on clear liquid obtained by filtration, and the built-in MBR is used for carrying out biochemical treatment and filtration treatment on the clear liquid obtained by ammonia evaporation;
the primary sedimentation tank, the primary anaerobic reactor, the secondary anaerobic reactor, the anaerobic sedimentation tank, the softening reactor, the tubular microfiltration membrane, the ammonia still and the built-in MBR are sequentially connected according to the circulation treatment direction of the garbage leachate.
2. The waste leachate treatment system of claim 1, further comprising a basket filter and a self-cleaning filter disposed at the front end of the primary sedimentation tank for filtering waste leachate.
3. The landfill leachate treatment system of claim 2, wherein the basket filter has a filtration precision of 5mm or 10 mm; the filtering precision of the self-cleaning filter is 1mm or 2 mm.
4. The waste leachate treatment system of claim 1, further comprising a conditioning tank for performing a uniform amount treatment on the waste leachate; the regulating tank is connected between the primary settling tank and the primary anaerobic reactor.
5. The landfill leachate treatment system of claim 1, wherein the anaerobic reaction temperature of the primary anaerobic reactor and the secondary anaerobic reactor is between 35 ℃ and 38 ℃.
6. The landfill leachate treatment system of claim 1, wherein the pore size of the microfiltration membrane of the tubular microfiltration membrane is 0.1 to 0.5 μm.
7. The waste leachate treatment system of any of claims 1 to 6, further comprising a sludge tank and a sludge dewatering treatment device connected to the sludge tank; the primary sedimentation tank, the primary anaerobic reactor, the secondary anaerobic reactor, the anaerobic sedimentation tank and the built-in MBR are respectively connected with the sludge tank; and/or the presence of a gas in the gas,
the landfill leachate treatment system also comprises an emergency nanofiltration device connected to the water outlet end of the built-in MBR, and the emergency nanofiltration device is used for filtering the outlet water of the built-in MBR.
8. A garbage leachate treatment method of a garbage incineration power plant is characterized by comprising the following steps:
s1, allowing the garbage leachate to enter a primary sedimentation tank for primary sedimentation treatment;
s2, conveying the waste leachate after the primary precipitation treatment to a primary anaerobic reactor for medium-temperature anaerobic treatment to decompose insoluble organic matters in the waste leachate into micromolecular substances;
s3, conveying the garbage leachate after medium-temperature anaerobic treatment to a secondary anaerobic reactor for secondary anaerobic treatment to remove organic matters in the garbage leachate;
s4, conveying the garbage leachate after the secondary anaerobic treatment to an anaerobic sedimentation tank for anaerobic sedimentation treatment;
s5, sending the effluent of the anaerobic sedimentation tank to a softening reactor, adding calcium hydroxide for softening treatment, and adjusting the addition amount of the calcium hydroxide according to the online measured pH value;
s6, conveying the softened waste leachate to a tubular microfiltration membrane, and filtering to remove suspended matters and organic microorganisms in the waste leachate;
s7, conveying the clear liquid obtained after filtration to an ammonia still for ammonia distillation treatment, and removing ammonia nitrogen in the clear liquid;
s8, sending the effluent of the ammonia still to a built-in MBR, and biochemically removing the biochemically available organic matters and performing biological denitrification through denitrification and nitrification.
9. The waste leachate treatment method of claim 8, wherein in step S1, the waste leachate is sequentially filtered through a basket filter and a self-cleaning filter before entering the primary sedimentation tank;
in step S2, the garbage leachate after the preliminary sedimentation treatment is first transferred to a conditioning tank for homogenization and volume equalization treatment, and then transferred to a primary anaerobic reactor.
10. The waste leachate treatment method of claim 8 or 9, further comprising the steps of:
and S9, filtering the effluent of the built-in MBR through an emergency nanofiltration device, and reducing the organic matter index of the effluent.
CN202010332288.8A 2020-04-24 2020-04-24 Garbage leachate treatment system and method for garbage incineration power plant Pending CN111470729A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010332288.8A CN111470729A (en) 2020-04-24 2020-04-24 Garbage leachate treatment system and method for garbage incineration power plant

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010332288.8A CN111470729A (en) 2020-04-24 2020-04-24 Garbage leachate treatment system and method for garbage incineration power plant

Publications (1)

Publication Number Publication Date
CN111470729A true CN111470729A (en) 2020-07-31

Family

ID=71764118

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010332288.8A Pending CN111470729A (en) 2020-04-24 2020-04-24 Garbage leachate treatment system and method for garbage incineration power plant

Country Status (1)

Country Link
CN (1) CN111470729A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112573776A (en) * 2020-12-23 2021-03-30 上海康恒环境股份有限公司 Novel percolate deamination system and deamination method thereof
CN112879914A (en) * 2021-01-25 2021-06-01 东华理工大学 Household garbage emergency treatment method for household garbage incineration power plant
CN114163076A (en) * 2022-01-13 2022-03-11 蚌埠皖能环保电力有限公司 Garbage penetrating fluid treatment process

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112573776A (en) * 2020-12-23 2021-03-30 上海康恒环境股份有限公司 Novel percolate deamination system and deamination method thereof
CN112879914A (en) * 2021-01-25 2021-06-01 东华理工大学 Household garbage emergency treatment method for household garbage incineration power plant
CN114163076A (en) * 2022-01-13 2022-03-11 蚌埠皖能环保电力有限公司 Garbage penetrating fluid treatment process
CN114163076B (en) * 2022-01-13 2024-03-01 蚌埠皖能环保电力有限公司 Garbage penetrating fluid treatment process

Similar Documents

Publication Publication Date Title
CN102649616B (en) Comprehensive treatment method for garbage leachate
CN107010788B (en) Large-scale pig farm cultivation wastewater treatment system and method
CN111470729A (en) Garbage leachate treatment system and method for garbage incineration power plant
CN110395851B (en) High-altitude town sewage treatment method based on nitrogen and phosphorus capture and completely autotrophic nitrogen removal
CN105060607A (en) Landfill leachate treatment method
CN102464420B (en) Sewage physical-chemical treatment method
CN112607963A (en) System and method for reducing percolate concentrated solution of waste incineration plant
CN205347102U (en) Degree of depth processing system of direct liquefaction of coal sewage
CN212356935U (en) Garbage leachate treatment system of garbage incineration power plant
CN103787554B (en) Process for treating landfill leachate
CN205035215U (en) Landfill leachate treatment device
CN112209577A (en) Kitchen wastewater treatment method
CN112209578A (en) Kitchen wastewater treatment system
US20230002262A1 (en) Method for deep treatment of household waste leachate by biochemical process
CN106145351A (en) The processing equipment of garbage incinerating power plant Leachate site
CN207002529U (en) Pyrazolone production wastewater treatment device
CN216737990U (en) Deep treatment system capable of achieving III-class water standard of surface water
CN105753254A (en) Sewage treatment system and sewage treatment method
CN107151082B (en) Zero-discharge treatment system and method for DMF (dimethyl formamide) -containing wastewater
CN214735172U (en) Wastewater treatment device and wastewater treatment system
CN112592003B (en) Method for treating brewing wastewater
CN212504490U (en) Landfill leachate treatment device
CN211445406U (en) Landfill leachate treatment device
CN209307174U (en) Liquor production wastewater processing system
CN205973975U (en) Waste incineration power plant leachate's treatment facility

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination