CN210457829U - Landfill leachate's treatment facility - Google Patents
Landfill leachate's treatment facility Download PDFInfo
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- CN210457829U CN210457829U CN201920908233.XU CN201920908233U CN210457829U CN 210457829 U CN210457829 U CN 210457829U CN 201920908233 U CN201920908233 U CN 201920908233U CN 210457829 U CN210457829 U CN 210457829U
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Abstract
The utility model provides a treatment device for landfill leachate, which comprises a pretreatment device, an anaerobic fermentation device, a flocculation oxidation device, a biochemical treatment device and a precipitation device which are connected in sequence through pipelines, wherein the pretreatment device is used for removing scum and precipitated particles on the surface of the landfill leachate; the anaerobic fermentation equipment is used for removing organic matters in the landfill leachate; the flocculation oxidation equipment is used for removing particles and colloidal substances in the landfill leachate; the biochemical treatment equipment is used for performing nitrogen and phosphorus removal treatment on the landfill leachate; the sedimentation equipment is used for settling the solid in the landfill leachate treated by the biochemical treatment equipment and finally discharging water. The technical scheme realizes the goal of membrane removal in landfill leachate treatment, and completely eliminates the problems of secondary pollution and frequent membrane blocking and backwashing caused by a membrane treatment method.
Description
Technical Field
The utility model belongs to the technical field of landfill leachate handles, concretely relates to landfill leachate's treatment facility.
Background
At present, the following two main ways are available for treating leachate in a refuse transfer station: 1. the combined process of electric flocculation, coagulation air flotation and nitrification comprises the following steps: the reaction principle of the electric flocculation is that metals such as aluminum, iron and the like are used as anodes, the anodes are corroded under the action of direct current to generate Al, Fe and other ions, and a series of hydrolysis, polymerization and ferrous oxidation processes are carried out. According to the past practical engineering experience, the method has large mud production amount. And the generated sludge contains a large amount of iron/aluminum ions, so that the sludge can only be treated as hazardous waste to form secondary pollution. The power consumption is very high and the consumption of the anode metal polar plate is very high in the practical operation of engineering application. In the current water treatment industry, the electric flocculation is mostly used for treating heavy metal-containing wastewater fields such as electroplating and the like, and the treatment effect on the high-concentration organic wastewater such as leachate of a garbage transfer station is not obvious. 2. Flocculation coagulation + SBR + MBR combined process: the membrane belongs to the category of ultrafiltration membranes. In practical engineering application, all sewage treated by adopting a membrane system has the problems of blockage and backwashing no matter ultrafiltration, nanofiltration and reverse osmosis. Backwash resulting in backwash liquid requires additional treatment. The backwashing water generated by nanofiltration and reverse osmosis has high salt content and is difficult to treat. The reverse osmosis process is commonly used in landfills and produces concentrate that is treated by recharging. In the garbage transfer station, the generated concentrated solution is intelligently processed by evaporation or other methods to form secondary pollution, and high concentrated solution disposal cost is generated. And although the aperture of the MBR membrane is far smaller than that of nanofiltration and reverse osmosis, the MBR membrane has the problems of frequent blockage and backwashing in practical application. For built-in MBR membranes, sticky substances are generated on the surface of the membrane filaments after operation for a period of time, so that the problems of water yield reduction and blockage are caused. The effect after the back washing is not obvious. Therefore, the method has the defects of high power consumption, high operation and maintenance cost, high treatment cost of the concentrated solution and the like.
The methods do not well get rid of the problems of blockage, concentrated solution treatment, high power consumption, secondary pollution and the like caused by a supported membrane technology. And the treatment effect and the actual operation cost are not ideal for the leachate of the refuse transfer station, which is the condition of high organic matter concentration, high salinity and high ammonia nitrogen.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a landfill leachate's treatment facility and method is provided, to the actual condition of the high salinity of landfill leachate, high organic matter concentration, high ammonia nitrogen in the rubbish transfer station, provide a brand-new solution method and thinking. The aim of membrane removal in landfill leachate treatment is achieved, and the problems of secondary pollution and frequent membrane blocking and backwashing caused by a membrane treatment method are completely eliminated.
In order to realize the purpose, the utility model adopts the technical scheme that: a treatment device for landfill leachate comprises a pretreatment device, an anaerobic fermentation device, a flocculation oxidation device, a biochemical treatment device and a precipitation device which are connected in sequence through pipelines,
wherein the pretreatment equipment is used for removing surface scum and sediment particles of the landfill leachate;
the anaerobic fermentation equipment is used for removing organic matters in the landfill leachate;
the flocculation oxidation equipment is used for removing particles and colloidal substances in the landfill leachate;
the biochemical treatment equipment is used for performing nitrogen and phosphorus removal treatment on the landfill leachate;
the sedimentation equipment is used for settling the solid in the landfill leachate treated by the biochemical treatment equipment and finally discharging water.
On the basis of the technical scheme, the utility model discloses can also have following further specific selection or optimization selection.
Specifically, the pretreatment device is a pretreatment tank, a filter screen is arranged at a water outlet of the pretreatment tank, and a water outlet of the pretreatment tank is communicated with a water inlet of the anaerobic fermentation device. And leachate extruded in the compression process of the garbage compressor of the garbage transfer station enters the pretreatment tank, and enters the pretreatment tank through self-flowing to remove slag and precipitate solid garbage and particles with large particle size.
Specifically, anaerobic fermentation equipment includes anaerobic fermentation tank, anaerobic fermentation tank upper end is equipped with the gas outlet, anaerobic fermentation tank lower extreme be equipped with the water inlet of pretreatment equipment intercommunication and with the delivery port of flocculation oxidation equipment intercommunication. Under the anaerobic environment, the anaerobic bacteria degrade soluble and insoluble organic matters through three stages of hydrolysis, acidogenesis and methanogenesis, so that a large amount of methane and carbon dioxide are generated.
The flocculation oxidation equipment comprises a first-stage flocculation pH adjusting tank, a first-stage sedimentation tank, a first-stage iron-carbon catalytic oxidation tank, a second-stage flocculation pH adjusting tank, a second-stage sedimentation tank, a second-stage iron-carbon catalytic oxidation tank, a third-stage flocculation pH adjusting tank and a third-stage sedimentation tank which are connected in sequence through pipelines, wherein a stirring device is further arranged in the first-stage iron-carbon catalytic oxidation tank and the second-stage iron-carbon catalytic oxidation tank, a water inlet of the first-stage flocculation pH adjusting tank is communicated with the anaerobic fermentation equipment, and a water outlet of the third-stage sedimentation tank is communicated with the biochemical treatment equipment. Specifically, the water inlet of one-level flocculation pH adjusting pond, one-level sedimentation tank, one-level iron carbon catalytic oxidation pond, second grade flocculation pH adjusting pond, second grade sedimentation tank, second grade iron carbon catalytic oxidation pond, tertiary flocculation pH adjusting pond and tertiary sedimentation tank all locates the upper portion of pool wall, and the lower part of pool wall is all located to the delivery port. In particular, the stirring device is a pneumatic stirring device, such as a bubbling machine. And forming a plurality of smaller solid particles and colloidal substances into flocculent precipitates in the primary flocculation pH adjusting tank under the action of a flocculating agent, removing the flocculent precipitates in the primary sedimentation tank, adjusting the pH to be between 1 and 5, then feeding the precipitates into the primary iron-carbon catalytic oxidation tank, and reacting and degrading organic matters under the action of pneumatic stirring. And then, the effluent enters a second-stage flocculation iron-carbon catalytic oxidation system, and the reaction conditions are as described above. And (4) performing a third-stage flocculation reaction on the effluent of the second-stage flocculation iron-carbon catalytic oxidation system, and adjusting the pH value to 6-9 for precipitation. The iron carbon has the function of realizing chain scission of long-chain organic matters through the catalytic oxidation of the iron carbon filler and changing macromolecular organic matters into small-molecular organic matters capable of being biochemically degraded. Through the catalytic oxidation of the iron and carbon, organic matters and ammonia nitrogen can be effectively removed. The removal rate of organic matters can reach 60 percent.
Specifically, the biochemical treatment equipment comprises six MBBR (moving bed biofilm reactors) reaction tanks which are communicated in sequence, a water inlet of the first MBBR reaction tank is communicated with the flocculation oxidation equipment, and a water outlet of the MBBR reaction tank is communicated with a water inlet of the sedimentation equipment. Specifically, each MBBR reaction tank connected in series in sequence is communicated with each other through a partition plate with a hole in the middle. The special biological filler is added into a reaction tank system of an MBBR (moving bed biofilm reactor), so that the biomass can reach 12g/L, and the pollutant treatment capacity is effectively improved. The special biological filler is purchased from a commercial product, is beneficial to the attachment of nitrobacteria and the like, forms dominant strains, and has remarkable nitrogen and phosphorus removal capability, the biomembrane sludge on the carrier is old, and the concentration of the nitrobacteria is high, so the nitrification and nitrogen removal capability is remarkable. The removal rate of ammonia nitrogen can reach more than 90 percent, and the method has great potential in advanced sewage treatment. The sewage treatment load can reach 6kgCOD/m3 d, and the floor area is greatly reduced.
Specifically, an oxygen-deficient pond is further arranged on a pipeline between the flocculation oxidation equipment and the biochemical treatment equipment, a water inlet of the oxygen-deficient pond is communicated with the flocculation oxidation equipment, and a water outlet of the oxygen-deficient pond is communicated with the biochemical treatment equipment. The special spherical filler is filled in the anoxic tank, and the denitrification capacity of the system can be increased by combining the special spherical filler with the MBBR reaction tank.
Furthermore, the utility model also provides a landfill leachate's processing method that uses landfill leachate's treatment facility to go on, it includes following step:
1) removing surface scum and precipitate particles of the landfill leachate by using the pretreatment equipment;
2) removing organic matters in the landfill leachate by using the anaerobic fermentation equipment;
3) removing particulates and colloidal matter from the landfill leachate using the flocculation oxidation device;
4) performing nitrogen and phosphorus removal treatment on the landfill leachate by using the biochemical treatment equipment;
5) and precipitating the solids in the landfill leachate treated by the biochemical treatment equipment by using the precipitation equipment, and finally discharging water.
Wherein, the agents put into the flocculation oxidation equipment are PAC (polyaluminium chloride) with the mass concentration of 10% and PAM (polyacrylamide) with the mass concentration of 0.3%, and sulfuric acid, oxalic acid or citric acid with the mass fraction of 4-10% is used for adjusting the pH value to 1-5.
Wherein, the sludge obtained in the treatment process is subjected to filter pressing and then is incinerated or buried.
Compared with the prior art, the beneficial effects of the utility model are that:
1. the method has better adaptability to the impact load of the concentration of organic matters in the landfill leachate. The anaerobic fermentation and flocculation oxidation reaction equipment at the front section of the method can adjust the dosage of the medicament and the anaerobic retention time according to the concentration of inlet water.
2. The system has no membrane component, and gets rid of the process idea of the prior membrane technology as the leading factor. The equipment and the method eliminate the problems of concentrated solution treatment, hazardous waste sludge treatment and the like caused in the application process of the membrane technology.
3. The whole system has no expensive, easy-to-wear and consumable articles. For example, in the electric flocculation process, the anode plate is an easily-consumed product and the dosage is very large. For another example, the membrane module is a vulnerable product, and the cost for replacing the membrane module is extremely high. According to practical engineering experience, the membrane module is usually the inside of one membrane system, the cost is the highest, and the replacement cost is high. The materials used in the device and the method have no other expensive, easily damaged and easily consumed products except for the conventional medicament, and have better economic benefit.
4. The treatment effect for the landfill leachate is more stable. The device and the method are realized through automatic control in design, and excessive manual intervention is not needed. Because of the design stability of the adopted process, the treatment effect is more stable.
5. The anti-pollution performance is excellent. The pollution resistance of the membrane component is poorer than that of the existing membrane system. Organic matters contained in raw water or improper organic agent addition in a pretreatment system can cause membrane pollution. The reverse osmosis membrane is an organic material and can cause breeding and propagation of bacteria, epilepsy poison, algae and the like. When a large number of microorganisms with vigorous vitality are bred on the surface of the membrane, the microorganisms covered on the surface of the membrane and the mucus produced by the microorganisms can block membrane pores, so that the desalination capacity of the membrane is reduced, the pressure difference of the membrane in the operation is increased, and the water yield is reduced. In contrast, neither the apparatus nor the method described above involves a membrane system, and the problems described above are not present. And the combination of biochemistry and materialization is adopted, which belongs to the most economical and effective treatment process.
Drawings
FIG. 1 is a schematic structural view of a landfill leachate treatment facility provided by the present invention;
fig. 2 is a process flow diagram of a treatment method of landfill leachate provided by the present invention.
In the drawings, the components represented by the respective reference numerals are listed below:
11. a pretreatment tank; 21. anaerobic fermentation tank; 31. a primary flocculation pH adjusting tank; 32. a first-stage sedimentation tank; 33. a first-stage iron-carbon catalytic oxidation tank; 34. a secondary flocculation pH adjusting tank; 35. a secondary sedimentation tank; 36. a secondary iron-carbon catalytic oxidation tank; 37. a third-stage flocculation pH adjusting tank; 38. a third-stage sedimentation tank; 41. an MBBR reaction tank; 5. an anoxic tank; 6. and (4) a precipitation device.
Detailed Description
For a better understanding of the present invention, the contents of the present invention will be further explained below with reference to the accompanying drawings and specific embodiments, but the present invention is not limited to the following embodiments.
As shown in the attached figure 1, the utility model provides a treatment device of landfill leachate, wherein arrows indicate the flow direction of the landfill leachate, the device comprises a pretreatment device, an anaerobic fermentation device, a flocculation oxidation device, a biochemical treatment device and a precipitation device 6 which are connected in sequence through pipelines,
wherein the pretreatment equipment is used for removing surface scum and sediment particles of the landfill leachate;
the anaerobic fermentation equipment is used for removing organic matters in the landfill leachate;
the flocculation oxidation equipment is used for removing particles and colloidal substances in the landfill leachate;
the biochemical treatment equipment is used for performing nitrogen and phosphorus removal treatment on the landfill leachate;
the precipitation device 6 is used for precipitating the solid in the landfill leachate treated by the biochemical treatment device and finally discharging water.
Preferably, the pretreatment device is a pretreatment tank 11, a filter screen is arranged at the water outlet of the pretreatment tank 11, and the water outlet of the pretreatment tank 11 is communicated with the water inlet of the anaerobic fermentation device. Leachate extruded in the compression process of a garbage compressor of the garbage transfer station enters the pretreatment tank 11, and solid garbage and particles with large particle sizes are removed through deslagging and sedimentation by flowing automatically.
Preferably, the anaerobic fermentation equipment comprises an anaerobic fermentation tank 21, an air outlet is arranged at the upper end of the anaerobic fermentation tank 21, and a water inlet communicated with the pretreatment equipment and a water outlet communicated with the flocculation oxidation equipment are arranged at the lower end of the anaerobic fermentation tank 21. Under the anaerobic environment, the anaerobic bacteria degrade soluble and insoluble organic matters through three stages of hydrolysis, acidogenesis and methanogenesis, so that a large amount of methane and carbon dioxide are generated.
Preferably, flocculation oxidation equipment includes the one-level flocculation pH equalizing basin 31, the one-level sedimentation tank 32, the one-level iron carbon catalytic oxidation pond 33, the second grade flocculation pH equalizing basin 34, the second grade sedimentation tank 35, the second grade iron carbon catalytic oxidation pond 36, the three-level flocculation pH equalizing basin 37 and the three-level sedimentation tank 38 that connect in order through the pipeline, still be equipped with agitating unit in one-level iron carbon catalytic oxidation pond 33 and the second grade iron carbon catalytic oxidation pond 36, the one-level flocculation pH equalizing basin 31 the water inlet with anaerobic fermentation equipment intercommunication, the delivery port of three-level sedimentation tank 38 with biochemical treatment equipment intercommunication. Specifically, the water inlets of the first-stage flocculation pH adjusting tank 31, the first-stage sedimentation tank 32, the first-stage iron-carbon catalytic oxidation tank 33, the second-stage flocculation pH adjusting tank 34, the second-stage sedimentation tank 35, the second-stage iron-carbon catalytic oxidation tank 36, the third-stage flocculation pH adjusting tank 37 and the third-stage sedimentation tank 38 are all arranged on the upper portion of the tank wall, and the water outlets are all arranged on the lower portion of the tank wall. In particular, the stirring device is a pneumatic stirring device, such as a bubbling machine. In the primary flocculation pH adjusting tank 31, a plurality of smaller solid particles and colloidal substances are formed into flocculent precipitates under the action of a flocculating agent, the flocculent precipitates are removed in the primary sedimentation tank 32, and the flocculent precipitates are adjusted to pH between 1 and 5 and then enter the primary iron-carbon catalytic oxidation tank 33 to react and degrade organic matters under the action of pneumatic stirring. And then, the effluent enters a second-stage flocculation iron-carbon catalytic oxidation system, and the reaction conditions are as described above. And (4) performing a third-stage flocculation reaction on the effluent of the second-stage flocculation iron-carbon catalytic oxidation system, and adjusting the pH value to 6-9 for precipitation. The iron carbon has the function of realizing chain scission of long-chain organic matters through the catalytic oxidation of the iron carbon filler and changing macromolecular organic matters into small-molecular organic matters capable of being biochemically degraded. Through the catalytic oxidation of the iron and carbon, organic matters and ammonia nitrogen can be effectively removed, and the removal rate of the organic matters can reach 60%.
Preferably, the biochemical treatment device comprises six MBBR (moving bed biofilm reactors) reaction tanks 41 which are communicated in sequence, the water inlet of the first MBBR reaction tank 41 is communicated with the flocculation oxidation device, and the water outlet of the MBBR reaction tank 41 is communicated with the water inlet of the sedimentation device. Specifically, each MBBR reaction tank connected in series in sequence is communicated with each other through a partition plate with a hole in the middle. The special biological filler is added into the MBBR reaction tank 41 system, so that the biomass can reach 12g/L, and the pollutant treatment capacity is effectively improved. The special biological filler is purchased from a commercial product, is beneficial to the attachment of nitrobacteria and the like, forms dominant strains, and has remarkable nitrogen and phosphorus removal capability, the biomembrane sludge on the carrier is old, and the concentration of the nitrobacteria is high, so the nitrification and nitrogen removal capability is remarkable. The removal rate of ammonia nitrogen can reach more than 90 percent, and the method has great potential in advanced sewage treatment. The sewage treatment load can reach 6kgCOD/m3 d, and the floor area is greatly reduced.
Preferably, an anoxic pond 5 is further arranged on a pipeline between the flocculation oxidation equipment and the biochemical treatment equipment, a water inlet of the anoxic pond 5 is communicated with the flocculation oxidation equipment, and a water outlet of the anoxic pond 5 is communicated with the biochemical treatment equipment. The special spherical filler is filled in the anoxic tank, and the denitrification capacity of the system can be increased by combining the special spherical filler with the MBBR reaction tank.
Furthermore, the utility model also provides a landfill leachate's processing method that uses landfill leachate's treatment facility to go on, it includes following step:
1) removing surface scum and precipitate particles of the landfill leachate by using the pretreatment equipment;
2) removing organic matters in the landfill leachate by using the anaerobic fermentation equipment;
3) removing particulates and colloidal matter from the landfill leachate using the flocculation oxidation device;
4) performing nitrogen and phosphorus removal treatment on the landfill leachate by using the biochemical treatment equipment;
5) and (3) precipitating the solids in the landfill leachate treated by the biochemical treatment equipment by using the precipitation equipment 6, and finally discharging water.
Preferably, the agents dosed in the flocculation oxidation equipment are PAC (polyaluminium chloride) with the mass concentration of 10% and PAM (polyacrylamide) with the mass concentration of 0.3%, and are adjusted to the pH value of 1-5 by using sulfuric acid, oxalic acid or citric acid with the mass fraction of 4-10%. Specifically, the agents put into the first-stage flocculation pH adjusting tank 31, the second-stage flocculation pH adjusting tank 34 and the third-stage flocculation pH adjusting tank 37 are PAC (polyaluminium chloride) with a mass concentration of 10% and PAM (polyacrylamide) with a mass concentration of 0.3%; the pH value of the first-stage sedimentation tank 32, the second-stage sedimentation tank 35 and the third-stage sedimentation tank 38 is adjusted to 1-5 by using 4-10% by mass of sulfuric acid, oxalic acid or citric acid.
Preferably, the sludge obtained in the above treatment process is subjected to pressure filtration and then to incineration or landfill.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (6)
1. A treatment device for landfill leachate is characterized by comprising a pretreatment device, an anaerobic fermentation device, a flocculation oxidation device, a biochemical treatment device and a precipitation device (6) which are connected in sequence through pipelines,
the pretreatment equipment is used for removing surface scum and sediment particles of the landfill leachate;
the anaerobic fermentation equipment is used for removing organic matters in the landfill leachate;
the flocculation oxidation equipment is used for removing particles and colloidal substances in the landfill leachate;
the biochemical treatment equipment is used for performing nitrogen and phosphorus removal treatment on the landfill leachate;
the sedimentation equipment (6) is used for settling the solid in the landfill leachate treated by the biochemical treatment equipment and finally discharging water.
2. The landfill leachate treatment plant of claim 1, wherein: the pretreatment device is a pretreatment tank (11), a filter screen is arranged at the water outlet of the pretreatment tank (11), and the water outlet of the pretreatment tank (11) is communicated with the water inlet of the anaerobic fermentation device.
3. The landfill leachate treatment plant of claim 1, wherein: the anaerobic fermentation equipment comprises an anaerobic fermentation tank (21), an air outlet is formed in the upper end of the anaerobic fermentation tank (21), and a water inlet communicated with the pretreatment equipment and a water outlet communicated with the flocculation oxidation equipment are formed in the lower end of the anaerobic fermentation tank (21).
4. The landfill leachate treatment plant of claim 1, wherein: flocculation oxidation equipment includes one-level flocculation pH equalizing basin (31), one-level sedimentation tank (32), one-level iron carbon catalytic oxidation pond (33), second grade flocculation pH equalizing basin (34), second grade sedimentation tank (35), second grade iron carbon catalytic oxidation pond (36), tertiary flocculation pH equalizing basin (37) and tertiary sedimentation tank (38) that connect in order through the pipeline, still be equipped with agitating unit in one-level iron carbon catalytic oxidation pond (33) and second grade iron carbon catalytic oxidation pond (36), the water inlet of one-level flocculation pH equalizing basin (31) with anaerobic fermentation equipment intercommunication, the delivery port of tertiary sedimentation tank (38) with biochemical treatment equipment intercommunication.
5. The landfill leachate treatment plant of claim 1, wherein: the biochemical treatment equipment comprises six MBBR reaction tanks (41) which are sequentially communicated, a water inlet of the first MBBR reaction tank (41) is communicated with the flocculation oxidation equipment, and a water outlet of the MBBR reaction tank (41) is communicated with a water inlet of the sedimentation equipment.
6. The landfill leachate treatment plant according to any one of claims 1 to 5, wherein: an anoxic pond (5) is further arranged on a pipeline between the flocculation oxidation equipment and the biochemical treatment equipment, a water inlet of the anoxic pond (5) is communicated with the flocculation oxidation equipment, and a water outlet of the anoxic pond (5) is communicated with the biochemical treatment equipment.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110240357A (en) * | 2019-06-17 | 2019-09-17 | 重庆耐德环境技术有限公司 | A kind of processing equipment and method of landfill leachate |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110240357A (en) * | 2019-06-17 | 2019-09-17 | 重庆耐德环境技术有限公司 | A kind of processing equipment and method of landfill leachate |
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