CN110282825B - Landfill leachate treatment method and system - Google Patents

Landfill leachate treatment method and system Download PDF

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Publication number
CN110282825B
CN110282825B CN201910567346.2A CN201910567346A CN110282825B CN 110282825 B CN110282825 B CN 110282825B CN 201910567346 A CN201910567346 A CN 201910567346A CN 110282825 B CN110282825 B CN 110282825B
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tank
effluent
guide plate
treatment system
electrolysis
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CN110282825A (en
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李威
李慧
罗丹
卢海威
黄磊
陈权
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Hunan Modern Environment Technology Co ltd
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Hunan Modern Environment Technology Co ltd
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00Multistage treatment of water, waste water, or sewage
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/34Treatment of water, waste water, or sewage with mechanical oscillations
    • C02F1/36Treatment of water, waste water, or sewage with mechanical oscillations ultrasonic vibrations
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/46Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/46Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/467Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction
    • C02F1/4672Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction by electrooxydation
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/52Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/66Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/72Treatment of water, waste water, or sewage by oxidation
    • C02F1/76Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00Nature of the contaminant
    • C02F2101/10Inorganic compounds
    • C02F2101/16Nitrogen compounds, e.g. ammonia
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/06Contaminated groundwater or leachate
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/30Aerobic and anaerobic processes

Abstract

The invention discloses a method and a system for treating landfill leachate, wherein the system comprises a 1 st tempering tank, an ultrasonic reaction tank, a 2 nd tempering tank, a primary iron-carbon micro-electrolysis tank, a 1 st coagulating sedimentation tank, a carrier microorganism biochemical treatment system and an environment-friendly filler filtering device which are sequentially communicated; the ultrasonic reaction tank is used for leading the effluent of the 1 st tempering tank to carry out ultrasonic reaction; the primary iron-carbon micro-electrolysis tank is used for leading the effluent of the 2 nd quenching and tempering tank to carry out iron-carbon micro-electrolysis catalytic oxidation reaction; the 1 st coagulating sedimentation tank is used for coagulating sedimentation of the effluent of the primary iron-carbon micro-electrolysis tank; the carrier microorganism biochemical treatment system comprises a hydrolysis acidification tank and an anaerobic-anoxic-aerobic biological nitrogen and phosphorus removal system which are sequentially connected; the environment-friendly filler filtering device is used for filtering the effluent of the carrier microorganism biochemical treatment system. The invention combines a physicochemical treatment system and a biochemical treatment system, and the total nitrogen content of the treated tail water can be reduced to 20-30 mg/L.

Description

Landfill leachate treatment method and system
Technical Field
The invention belongs to the technical field of environmental engineering sewage treatment, and particularly relates to a method and a system for treating landfill leachate.
Background
The landfill leachate is high-concentration wastewater which is formed by deducting the saturated water holding capacity of garbage and a soil covering layer from water contained in the garbage in a garbage landfill, rain, snow and water entering the landfill and other water and passing through the garbage layer and the soil covering layer. High-concentration ammonia nitrogen is one of the water quality characteristics of leachate, and the ammonia nitrogen concentration of the leachate is generally from dozens of milligrams to thousands of milligrams per liter. According to the change rule of the quality of the percolate generated by domestic garbage landfill sites, along with the extension of the landfill time, the ammonia nitrogen concentration of the percolate tends to increase, and the biodegradability is reduced.
Due to the characteristics of complex composition, high pollution concentration and high content of heavy metal ions of the landfill leachate, the problems of imbalance of biodegradability of the landfill leachate, high operation cost, accumulation of pollutants, overproof total nitrogen and the like generally occur along with the aging of the landfill leachate, the original process is difficult to meet the actual operation requirement, and the difficulty of stable standard reaching of effluent is higher.
Disclosure of Invention
The technical problem to be solved by the present invention is to overcome the above mentioned disadvantages and drawbacks of the background art.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
a landfill leachate treatment method is characterized by comprising the following steps:
s1, adjusting the pH value of the leachate to 10-11, then enabling the leachate to enter an ultrasonic reaction tank, adding sodium hypochlorite serving as an oxidant, and carrying out ultrasonic reaction under the action of sound waves of 25-30 kilohertz;
s2, adjusting the pH value of the effluent of the ultrasonic reaction tank to 2-3, then enabling the effluent to enter an iron-carbon micro-electrolysis tank, and simultaneously adding hydrogen peroxide to perform iron-carbon micro-electrolysis catalytic oxidation reaction;
s3, enabling the effluent of the iron-carbon micro-electrolysis tank to enter a coagulating sedimentation tank, adjusting the pH value to 7.5-8.0, and then adding a coagulant for coagulating sedimentation;
s4, enabling the effluent of the coagulating sedimentation tank to enter a carrier microorganism biochemical treatment system for treatment, wherein the carrier microorganism biochemical treatment system comprises a hydrolysis acidification tank and an anaerobic-anoxic-aerobic method biological nitrogen and phosphorus removal system which are sequentially connected;
and S5, enabling the effluent of the carrier microorganism biochemical treatment system to enter an environment-friendly filler filtering device for filtering, and then discharging the effluent.
Furthermore, the adding amount of sodium hypochlorite in S1 is 1.5-2.5 kg/ton water.
Further, the adding amount of hydrogen peroxide in S2 is 0.8-1.2 kg/ton of water.
And further, the effluent of the S3 coagulative precipitation tank is subjected to a second-stage iron-carbon microelectrolysis catalytic oxidation reaction, and then enters a carrier microorganism biochemical treatment system after being coagulated and precipitated again.
A landfill leachate treatment system suitable for the said processing method, this system includes the 1 st quenching and tempering pool, ultrasonic reaction tank, 2 nd quenching and tempering pool, first-class iron carbon microelectrolytic tank, 1 st coagulating sedimentation tank, microbiological biochemical treatment system of carrier and environmental protection filler filter equipment that communicate sequentially;
the 1 st tempering tank and the 2 nd tempering tank are used for adjusting the pH value of the treatment fluid;
the ultrasonic reaction tank is used for performing ultrasonic reaction on the effluent of the conditioning tank 1;
the primary iron-carbon micro-electrolysis tank is used for leading the effluent of the 2 nd conditioning tank to carry out iron-carbon micro-electrolysis catalytic oxidation reaction;
the 1 st coagulative precipitation tank is used for performing coagulative precipitation on the effluent of the primary iron-carbon micro-electrolysis tank;
the carrier microorganism biochemical treatment system comprises a hydrolysis acidification tank and an anaerobic-anoxic-aerobic biological nitrogen and phosphorus removal system which are sequentially connected;
the environment-friendly filler filtering device is used for filtering the effluent of the carrier microorganism biochemical treatment system.
Further, a 3 rd tempering tank, a second-level iron-carbon micro-electrolysis tank and a 2 nd coagulating sedimentation tank which are sequentially communicated are also arranged between the 1 st coagulating sedimentation tank and the carrier microorganism biochemical treatment system.
Furthermore, the aerobic zone of the carrier microorganism biochemical treatment system adopts a fluidized bed biological film reaction tank, the reaction tank comprises an aerator positioned at the bottom of the reaction tank, a first guide plate, a second guide plate and a third guide plate, the first guide plate, the second guide plate and the third guide plate are arranged in the middle of the reaction tank, the aerator and the second guide plate are respectively positioned at two sides of the first guide plate, the third guide plate is positioned at the outer side of the second guide plate and close to the wall of the reaction tank, water flow circulates around the first guide plate and is changed in flow direction by the second guide plate, and a water outlet zone is formed between the third guide plate and the wall of the reaction tank.
Furthermore, the top of the second guide plate is lower than the water surface, the top of the third guide plate is slightly higher than the water surface, the second guide plate comprises a vertical section at the upper part and an outward-inclined section at the lower part, and the bottom end of the outward-inclined section is provided with an inward-inclined inner hook section.
Furthermore, a first flow guide inclined plane is arranged at the intersection of the side wall and the bottom of the reaction tank below the second flow guide plate, the first flow guide inclined plane is parallel to the inner hook section, and water flows through the first flow guide inclined plane and the inner hook section.
Furthermore, a second flow guide inclined plane is arranged above the aerator and at the top of the side wall of the reaction tank.
Compared with the prior art, the invention has the beneficial effects that:
the invention combines a physicochemical treatment system and a biochemical treatment system, and the total nitrogen content of the treated tail water can be reduced to 20-30 mg/L. The removal rate can reach 40-50% through ultrasonic cavitation, 70-80% per stage through iron-carbon micro-electrolysis reaction, 70-80% through the action of nitrobacteria and denitrifying bacteria in the carrier microbial biochemical treatment system, and 70-80% through ion exchange, adsorption, catalysis and other actions of the environment-friendly filler.
Produce the organic pollutant in the free radical oxidation aquatic through ultrasonic cavitation, simultaneously because the existence of sodium hypochlorite, the frequency can be dropped to 25 ~ 30 kilohertz, and power consumption is little, and the getting rid of organic matter and ammonia nitrogen is effectual, can promote the biodegradability of filtration liquid.
Through two-stage iron-carbon micro-electrolysis treatment, a plurality of primary batteries are formed to have oxidation reaction so as to break and open the ring of the organic matters difficult to degrade, and simultaneously, carbon is used as a catalyst, air is used as an oxidant, and pollutants in water are further removed through oxidation. The stage can effectively remove the chromaticity of the percolate, and the effect of degradation and decoloration is achieved.
Ammonia nitrogen and organic matters in water are further removed through ion exchange, adsorption and catalytic performance of the environment-friendly filler, and the effluent is ensured to stably reach the standard.
The invention can be suitable for landfill leachate at different stages and is also suitable for the treatment of refuse leachate in incineration plants. Aiming at the aged refuse landfill leachate with higher pollution concentration, a biochemical treatment system is arranged between the physicochemical treatment system and the environment-friendly filler filtration. Aiming at the percolate of the household garbage incineration plant, the biochemical treatment system can be arranged in front of the physicochemical treatment system.
The unit investment of the newly added project of the landfill leachate in the domestic market at present is 10 ten thousand yuan/ton, while the unit cost of the physicochemical and biochemical treatment process is only 3-3.5 ten thousand yuan/ton. And the running cost of the process in the running process can be controlled to be about 20-25 yuan/ton, which is equivalent to the running cost of other processes in the domestic market at present, but no concentrated solution is generated, so that the running cost can be reduced, and the process has advantages.
The process has the characteristics of stable effluent reaching the standard, no pollutant accumulation, low energy consumption, low investment and operation cost and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic view of a landfill leachate treatment system and method of the present invention;
FIG. 2 is a structure of a fluidized bed biofilm reaction tank according to an embodiment of the present invention.
Wherein, 1, an aeration pipe; 2. an aerator; 3. a carrier; 4. air; 5. a water outlet; 6. a first baffle; 7. a second baffle; 8. a third baffle; 9. a water inlet; 10. a first diversion inclined plane; 11. a second diversion inclined plane.
Detailed Description
In order to facilitate understanding of the invention, the invention will be described more fully and in detail with reference to the accompanying drawings and preferred embodiments, but the scope of the invention is not limited to the specific embodiments below.
Unless otherwise defined, all terms of art used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present invention.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
In one embodiment of the invention, as shown in fig. 1, the landfill leachate treatment system comprises a 1 st tempering tank, an ultrasonic reaction tank, a 2 nd tempering tank, a primary iron-carbon micro-electrolysis tank, a 1 st coagulating sedimentation tank, a 3 rd tempering tank, a secondary iron-carbon micro-electrolysis tank, a 2 nd coagulating sedimentation tank, a carrier microorganism biochemical treatment system and an environment-friendly filler filtering device which are sequentially communicated. The carrier microorganism biochemical treatment system comprises a hydrolysis acidification tank and an anaerobic-anoxic-aerobic method biological nitrogen and phosphorus removal system which are sequentially connected.
In one embodiment of the present invention, as shown in fig. 1, the landfill leachate treatment method includes the following steps:
and (I) enabling the percolate to flow into a regulating tank, regulating the water quality and the water quantity, and then pumping to a No. 1 tempering tank.
And (II) adding alkali into the conditioning tank 1 to adjust the pH value of the leachate to 10-11, and then entering an ultrasonic reaction tank.
And (III) generating sound waves of 25-30 kilohertz by three-stage air compression, and adding a sodium hypochlorite solution as an oxidant to perform ultrasonic reaction. The addition amount of sodium hypochlorite is 1.5-2.5 per mill (1.5-2.5 kg/ton water).
Under the local high-temperature and high-pressure environment generated by ultrasonic cavitation, ammonia nitrogen is converted into free nitrogen, and the free nitrogen is oxidized into nitrogen to escape from the water surface and be removed. At the same time, water can be decomposed to generate H and OH free radicals, and air (N) dissolved in the solution2And O2) Radical cleavage reactions can also occur to produce N and O radicals. These oxidizing radicals can chemically react with and gradually degrade organic matter in the wastewater. Due to the change of reaction conditions caused by ultrasonic cavitation, the thermodynamic change of the chemical reaction is caused, and the speed and the yield of the chemical reaction are improved.
And (IV) the effluent after ultrasonic treatment enters a 2 nd tempering tank, and acid is added to adjust the pH value to 2-3.
And fifthly, performing primary iron-carbon micro-electrolysis and catalytic oxidation reaction, and simultaneously adding hydrogen peroxide (the adding amount is 0.8-1.2 per thousand and 0.8-1.2 kg/ton of water) to perform chain scission and ring opening on organic matters which are difficult to degrade in the wastewater. Produced Fe2+Further oxidized to Fe3+Their hydrates have stronger adsorption-flocculation activity, and the pH value can be raised to above 5.5 after reaction. The reaction time of the iron and the carbon is controlled to be 1.5 to 2.5 hours.
And (VI), the effluent after the first-level iron-carbon micro-electrolysis and catalytic oxidation reaction enters a 1 st coagulative precipitation tank, alkali is added to adjust the pH value to 7.5-8.0, PAC and PAM are added to carry out coagulative precipitation to generate ferrous hydroxide and ferric hydroxide colloid, the adsorption capacity of the ferrous hydroxide and the ferric hydroxide colloid is far higher than that of the ferric hydroxide colloid obtained by hydrolysis of a common medicament, and a large amount of dispersed micro particles, metal particles and organic macromolecules in the water can be adsorbed.
And (seventhly), enabling the effluent of the 1 st coagulative precipitation tank to enter a 3 rd tempering tank, adding acid to adjust the pH value to 2.5-3.0, then performing secondary iron-carbon micro-electrolysis catalytic oxidation and coagulative precipitation in the 2 nd coagulative precipitation tank, and further oxidizing to remove pollutants in water. And (3) precipitating and discharging sludge generated by the two-stage iron-carbon micro-electrolysis reaction tank in a coagulating sedimentation tank, then feeding the sludge into a sludge concentration tank, pumping the sludge into a sludge dewatering machine for dewatering treatment, burying sludge cakes, and refluxing waste water into an adjusting tank.
And (eighth) the effluent of the coagulation sedimentation tank 2 enters a carrier microorganism biochemical treatment system. Adopting a hydrolysis acidification pool plus A2Combined treatment of/O, A2The connection arrangement of the anaerobic zone, the anoxic zone and the aerobic zone in the/O adopts the conventional technology.
(1) Hydrolysis acidification pool
Firstly, non-soluble organic matters are converted into soluble organic matters through a hydrolysis acidification pool, so that the biodegradability of the wastewater is improved, and the subsequent aerobic treatment is facilitated.
(2)A2O (anaerobic-anoxic-aerobic method biological nitrogen and phosphorus removal)
a. Anaerobic reaction
The pretreated percolate and return sludge firstly enter an anaerobic zone, and in the unit, phosphorus accumulating bacteria obtain sufficient carbon sources and release phosphorus. Part of soluble organic matters and ammonia nitrogen are removed due to the action of microorganisms,
b. lack of oxygen
The leachate and the reflux mixed liquor entering the anoxic zone convert nitrate nitrogen into nitrogen by using organic matters in water as a carbon source under the action of denitrifying bacteria.
c. Aerobic
The aerobic zone adopts a fluidized bed biomembrane process. Under the action of microbes in the fluidized bed biomembrane reaction tank, organic matters, ammonia nitrogen and phosphorus are further degraded. The fluidized biological carrier violently moves and collides in the reaction tank, so that the surface of the biological membrane can be continuously updated, and most of microorganisms on the surface of the biological membrane can be ensured to be in logarithmic growth phase, thereby improving the comprehensive treatment efficiency of the system and enhancing the load impact resistance of the system.
Reaction conditions are as follows: the dissolved oxygen is controlled to be 2.0-4.0mg/l, the retention time is controlled to be 8-10h, the alkalinity is controlled to be 100-200mg/l, and the pH value is controlled to be 6.5-8.0.
The structure of the fluidized bed biofilm reaction tank of the invention is shown in figure 2, and comprises an aeration pipe 1, an aerator 2 positioned at the bottom of the reaction tank, a first guide plate 6, a second guide plate 7 and a third guide plate 8 which are arranged in the middle of the interior of the reaction tank. The water inlet 9 and the water outlet 5 are respectively arranged at the upper parts of the opposite side walls of the reaction tank. The aerator 2 and the second guide plate 7 are respectively positioned at two sides of the first guide plate 6. The third guide plate 8 is close to the water outlet 5, and the second guide plate 7 is positioned on the inner side of the third guide plate 8. The top of the second guide plate 7 is lower than the water surface, the top of the third guide plate 8 is slightly higher than the water surface, the second guide plate 7 comprises a vertical section at the upper part and an outward-inclined section at the lower part, and the bottom of the outward-inclined section is provided with an inward-inclined inner hook section. And a first diversion inclined plane 10 is arranged at the intersection of the side wall and the bottom of the reaction tank below the second diversion plate 7, the first diversion inclined plane 10 is parallel to the inner hook section, and water flow passes through the first diversion inclined plane and the inner hook section. A second diversion inclined plane 11 is arranged above the aerator 2 and at the top of the side wall of the reaction tank. The water flow circulates around the first guide plate 6 and is changed by the second guide plate 7, and a water outlet area is formed between the third guide plate 8 and the wall of the reaction tank.
The tank type design of the invention and the arrangement of the first guide plate 6 and the second guide plate 7 effectively ensure good fluidization state in the tank and prevent the deposition of biological carriers. The air 4 circularly flows in the biological reaction tank (as the arrow in figure 2), and is cut into finer bubbles by the carrier 3 in a fluidized state, so that the combination of the bubbles in the reaction tank is effectively prevented, and the oxygen utilization rate is greatly improved. Meanwhile, the fluid carriers collide and rub with each other, so that the effluent deterioration caused by aged and even dead biological membranes is prevented. And the third guide plate 8 is arranged, so that the water outlet area becomes a static area, and the carrier is effectively prevented from losing along with the outlet water.
And (nine) filtering the effluent of the carrier microbial biochemical treatment system by using an environment-friendly filler (the environment-friendly filler for filtering sewage is adopted and is commercially available, such as HB-66 filler of Zhangkou Ruihong water treatment company, and main chemical components of the filler are silicon dioxide, aluminum oxide, ferric oxide and the like), performing ion exchange, adsorption and catalytic reaction, further removing ammonia nitrogen and organic matters in the water, and ensuring that the effluent stably reaches the standard. Finally, the wastewater is discharged after reaching the standard through a water outlet pool.
Aiming at the aged refuse landfill leachate with higher pollution concentration, as shown in figure 2, a biochemical treatment system is arranged between a physical and chemical treatment system and the environment-friendly filler filtration. Aiming at the percolate of a domestic garbage incineration plant, a biochemical treatment system is arranged in front of a physicochemical treatment system, a carrier microorganism biochemical treatment system is arranged between a regulating tank and a No. 1 conditioning tank, and the effluent after secondary coagulation and precipitation is filtered by an environment-friendly filler.
The steps (one) to (nine) are adopted for treatment, leachate of a refuse landfill in Yueyang Yunxi district is taken as inflow water for pilot plant test, the treatment capacity is 300L/h, the inflow water quality COD (6342mg/L), NH3-N (1965mg/L), TN (3406mg/L), the treatment test of 6 months is carried out by adopting the technical scheme of the invention, and the average value of the water quality after the treatment is COD (62.6mg/L), NH3N (28.4mg/L), TN (30mg/L), as shown in Table 1.
TABLE 1 quality of inlet and outlet water of landfill leachate treatment station
The foregoing is considered as illustrative of the preferred embodiments of the invention and is not to be construed as limiting the invention in any way. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention should fall within the protection scope of the technical scheme of the present invention, unless the technical spirit of the present invention departs from the content of the technical scheme of the present invention.

Claims (4)

1. A landfill leachate treatment method is characterized by comprising the following steps:
s1, adjusting the pH value of the leachate to 10-11, then enabling the leachate to enter an ultrasonic reaction tank, adding sodium hypochlorite serving as an oxidant, and carrying out ultrasonic reaction under the action of sound waves of 25-30 kilohertz, wherein the addition amount of the sodium hypochlorite is 1.5-2.5 kg/ton of water;
s2, adjusting the pH value of the effluent of the ultrasonic reaction tank to 2-3, then enabling the effluent to enter an iron-carbon micro-electrolysis tank, and simultaneously adding hydrogen peroxide to perform iron-carbon micro-electrolysis catalytic oxidation reaction;
s3, enabling the effluent of the iron-carbon micro-electrolysis tank to enter a coagulating sedimentation tank, adjusting the pH value to 7.5-8.0, then adding a coagulant for coagulating sedimentation, carrying out a second-stage iron-carbon micro-electrolysis catalytic oxidation reaction on the effluent of the coagulating sedimentation tank, and then carrying out coagulating sedimentation again;
s4, enabling the effluent of the coagulating sedimentation tank to enter a carrier microorganism biochemical treatment system for treatment, wherein the carrier microorganism biochemical treatment system comprises a hydrolysis acidification tank and an anaerobic-anoxic-aerobic method biological nitrogen and phosphorus removal system which are sequentially connected;
and S5, enabling the effluent of the carrier microorganism biochemical treatment system to enter an environment-friendly filler filtering device for filtering, and then discharging the effluent.
2. The landfill leachate treatment method according to claim 1, wherein the amount of hydrogen peroxide added in S2 is 0.8-1.2 kg/ton of water.
3. A landfill leachate treatment system suitable for the treatment method according to claim 1 or 2, wherein the system comprises a 1 st conditioning tank, an ultrasonic reaction tank, a 2 nd conditioning tank, a primary iron-carbon micro-electrolysis tank, a 1 st coagulating sedimentation tank, a carrier microorganism biochemical treatment system and an environment-friendly filler filtering device which are sequentially communicated;
the 1 st tempering tank and the 2 nd tempering tank are used for adjusting the pH value of the treatment fluid;
the ultrasonic reaction tank is used for performing ultrasonic reaction on the effluent of the conditioning tank 1;
the primary iron-carbon micro-electrolysis tank is used for leading the effluent of the 2 nd conditioning tank to carry out iron-carbon micro-electrolysis catalytic oxidation reaction;
the 1 st coagulative precipitation tank is used for performing coagulative precipitation on the effluent of the primary iron-carbon micro-electrolysis tank;
the carrier microorganism biochemical treatment system comprises a hydrolysis acidification tank and an anaerobic-anoxic-aerobic biological nitrogen and phosphorus removal system which are sequentially connected;
the environment-friendly filler filtering device is used for filtering the effluent of the carrier microorganism biochemical treatment system;
the aerobic zone of the carrier microorganism biochemical treatment system adopts a fluidized bed biomembrane reaction tank, the reaction tank comprises an aerator (2) positioned at the bottom of the reaction tank, a first guide plate (6) arranged in the middle of the interior of the reaction tank, a second guide plate (7) and a third guide plate (8), the aerator (2) and the second guide plate (7) are respectively positioned at two sides of the first guide plate (6), the third guide plate (8) is positioned at the outer side of the second guide plate (7) and close to the wall of the reaction tank, water flow circulates around the first guide plate (6) and is changed in flow direction by the second guide plate (7), and a water outlet zone is formed between the third guide plate (8) and the wall of the reaction tank;
the top of the second guide plate (7) is lower than the water surface, the top of the third guide plate (8) is slightly higher than the water surface, the second guide plate (7) comprises an upper vertical section and a lower outward inclined section, and the bottom end of the outward inclined section is provided with an inward inclined inner hook section;
a first diversion inclined plane (10) is arranged at the intersection of the side wall and the bottom of the reaction tank below the second diversion plate (7), the first diversion inclined plane (10) is parallel to the inner hook section, and water flows between the first diversion inclined plane and the inner hook section;
a second diversion inclined plane (11) is arranged above the aerator (2) and at the top of the side wall of the reaction tank.
4. The landfill leachate treatment system of claim 3, further comprising a 3 rd tempering tank, a second-level iron-carbon micro-electrolysis tank and a 2 nd coagulation sedimentation tank which are sequentially communicated between the 1 st coagulation sedimentation tank and the carrier microorganism biochemical treatment system.
CN201910567346.2A 2019-06-27 2019-06-27 Landfill leachate treatment method and system Active CN110282825B (en)

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