CN112047468A - Biochemical treatment method of landfill leachate - Google Patents
Biochemical treatment method of landfill leachate Download PDFInfo
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- 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
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- 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
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
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- 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
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
- C02F3/348—Biological treatment of water, waste water, or sewage characterised by the microorganisms used characterised by the way or the form in which the microorganisms are added or dosed
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
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Abstract
The invention belongs to the technical field of sewage purification treatment, and particularly relates to a biochemical treatment method of landfill leachate, which comprises the following steps: s1, conveying the landfill leachate to an anaerobic reactor for anaerobic reaction; s2, conveying the waste liquid treated in the step S1 to a first anaerobic pool, and adding a composite microbial inoculum diluent and activated sludge; s3, conveying the waste liquid treated in the step S2 to a first aerobic tank for aeration treatment; s4, conveying the waste liquid treated in the step S2 to a second aerobic tank, and carrying out aeration treatment and precipitation; s5, returning supernatant of the second aerobic tank to the first anaerobic tank, and returning sludge at the bottom of the second aerobic tank to the first anaerobic tank; conveying other waste liquid in the second aerobic tank to a second anaerobic tank; s6, conveying the waste liquid treated by the second anaerobic tank to a membrane-bioreactor to separate water and sludge to obtain effluent. The invention has obvious comprehensive treatment effect on the landfill leachate.
Description
Technical Field
The invention belongs to the technical field of sewage purification treatment, and particularly relates to a biochemical treatment method of landfill leachate.
Background
In recent years, with the rapid development of economy, the total amount of discharged garbage is increasing. The treatment mode of the domestic garbage is mainly a landfill method, an incineration method and a composting method, and due to the limitation of various factors, the urban biological garbage is often treated by a simple stacking method, so that a plurality of large garbage piles appear around a city. These dumps produce large volumes of leachate which can cause serious pollution to the surrounding soil and groundwater.
The garbage leachate is generated in the process of landfill, secondary pollution is formed due to precipitation, garbage fermentation, groundwater reverse osmosis and the like, and the leachate formed by the atmospheric precipitation which is not drained in time seeps through the garbage accounts for the most part of the total amount.
The pollutant of the garbage penetrating fluid is various and is greatly different from domestic sewage and industrial wastewater. According to different landfill components, the leachate contains organic matters such as hydrocarbons, acid esters, alcohol phenols, ketone aldehydes, amides and the like, various heavy metals and salts with different total amounts, and meanwhile, the total nitrogen content is higher. The concentration of pollutants in the leachate is extremely high, and the leachate can pollute water, soil, atmosphere and the like, so that the ground water is anoxic, water quality is deteriorated, eutrophication is realized, drinking water and industrial and agricultural water sources are threatened, underground water loses the utilization value, organic pollutants enter a food chain to directly threaten human health, and therefore the landfill leachate can be discharged to the nature only through harmless treatment. The difficulty of treating the landfill leachate is high, and the realization of economic and effective treatment of the landfill leachate is a difficult point in the landfill leachate treatment technology.
In the prior art, patent document CN111039463A discloses a method for treating landfill leachate by fenton process, which comprises the following steps: (1) adding alkaline liquor to adjust the pH value of the effluent of the landfill leachate MBR; (2) adding a ferrous reagent into the effluent water obtained in the step 1; (3) adding hydrogen peroxide into the effluent obtained in the step (2); (4) adding alkali liquor into the effluent obtained in the step (3) to control the pH value of the effluent to be in a constant range, wherein the reaction time is T1; (5) and (4) taking the effluent in the step (4), continuing to react for time T2, adding liquid alkali to a constant pH value, and flocculating. The process is the optimization of the treatment method of the membrane-bioreactor, the membrane-bioreactor has poor treatment effect on COD and total nitrogen in the wastewater, and particularly when high-concentration wastewater is treated, the reduction of COD and total nitrogen content of effluent is low. Although the Fenton reagent method is used, more than 85% of COD and total nitrogen in the MBR effluent are further removed, and the effluent quality is improved; however, ferrous solution and hydrogen peroxide are used in the fenton reagent method treatment process, a large amount of iron elements are contained in the discharged sludge, special treatment is needed, otherwise secondary pollution is caused, the addition amount of chemical reagents is large, the cost is high, and the used reagents are disposable and cannot be recycled.
In addition, patent document No. CN110342651A discloses a microbial enzyme complex preparation, a preparation method thereof, and an application thereof in treating industrial sewage or landfill leachate, wherein the process for treating industrial sewage or landfill leachate comprises the following steps: (1) taking sludge at the bottoms of an aerobic tank and an anaerobic tank of a sewage treatment plant, diluting the sludge with water respectively, and filtering to obtain aerobic coarse filtrate and anaerobic coarse filtrate; (2) then filtering to obtain aerobic refined filtrate and anaerobic refined filtrate; (3) respectively inoculating the aerobic refined filtrate and the anaerobic refined filtrate into a fermentation culture medium for culturing to obtain aerobic fermentation liquor and anaerobic fermentation liquor; (4) centrifuging the fermentation liquor, performing cell disruption on the precipitate, and extracting protein to obtain aerobic bacterial protease and anaerobic bacterial protease; (5) mixing commercially available EM microbial inoculum, aerobic bacterial protease and anaerobic bacterial protease in proportion to obtain the microbial enzyme composite preparation. Aerobic bacteria protease and anaerobic bacteria protease are added into the EM microbial inoculum, the composite microbial inoculum adapts to the anaerobic environment and the aerobic environment more quickly, the activity is kept, and the reaction capability to COD is improved. However, the microbial inoculum used in the process mainly has the effects of removing the COD content in the wastewater, the treatment object is single, corresponding implementation steps are lacked for removing the total nitrogen, and the total nitrogen content of the final effluent is higher.
Therefore, it is necessary to develop a new method for effectively treating landfill leachate.
Disclosure of Invention
Based on the above disadvantages and shortcomings of the prior art, one of the objectives of the present invention is to solve at least one or more of the above problems of the prior art, in other words, one of the objectives of the present invention is to provide a method for biochemical treatment of landfill leachate, which uses a composite microbial inoculum prepared by an activation process to treat landfill leachate generated during landfill process, and reduces indexes of the landfill leachate, such as COD, total nitrogen, etc., and improves the landfill leachate treatment capability through operations of an anaerobic reactor, an anaerobic tank, an aerobic tank, precipitation, reflux, an anaerobic tank, a membrane-bioreactor, etc., compared with the prior art, the method is simpler, more convenient, easier to operate, lower in cost, and higher in effluent quality.
In order to achieve the purpose, the invention adopts the following technical scheme:
a biochemical treatment method of landfill leachate comprises the following steps:
s1, conveying the landfill leachate to an anaerobic reactor for anaerobic reaction;
s2, conveying the waste liquid treated in the step S1 to a first anaerobic pool, and adding a composite microbial inoculum diluent and activated sludge;
s3, conveying the waste liquid treated in the step S2 to a first aerobic tank for aeration treatment;
s4, conveying the waste liquid treated in the step S2 to a second aerobic tank, and carrying out aeration treatment and precipitation;
s5, returning supernatant of the second aerobic tank to the first anaerobic tank, and returning sludge at the bottom of the second aerobic tank to the first anaerobic tank until a target reaction period is reached;
s6, conveying the waste liquid treated by the second anaerobic tank to a membrane-bioreactor to separate water and sludge to obtain effluent.
As a preferred scheme, the biochemical treatment method of the landfill leachate also comprises the following steps:
s7, detecting whether the index of the effluent is qualified; if yes, discharging; if not, the process is refluxed to continue.
Preferably, the complex microbial inoculum diluent comprises complex microbial inoculum stock solution, molasses and water, wherein the mass ratio of the complex microbial inoculum stock solution to the molasses to the water is 1: (0.5-2): 50.
as a preferred scheme, the composite microbial inoculum stock solution comprises a composite microbial inoculum, molasses and water, wherein the mass ratio of the composite microbial inoculum to the molasses to the water is 1: (2-10): 100.
as a preferable scheme, the compound microbial inoculum comprises the following components in percentage by weight: 55-64% of lactobacillus, 20-25% of prevotella, 1.5-5% of acetobacter, 0.5-2% of candida boidinii, 0.5-1.8% of veillonella, 0.24-1.2% of rhodospirillum and 1-22.26% of auxiliary strains.
As a preferable scheme, the preparation of the composite microbial inoculum diluent comprises the following steps:
s10, preparing a complex microbial inoculum, molasses and water into a complex microbial inoculum stock solution, and activating;
and S20, preparing the activated composite bacterial agent stock solution, molasses and water into composite bacterial agent diluent, and sequentially activating and culturing.
Preferably, the activation process in step S10 is: placing the culture medium in a completely anaerobic environment for sealed culture for 5-10 days; the activation process in step S20 is: culturing for 3-8 days in an aerobic environment, and carrying out aeration treatment in the period; the culture process in the step S20 comprises the following steps: and (3) placing the activated compound microbial inoculum diluent at a constant temperature of 25-40 ℃ for culturing for 20-48 h.
Preferably, the activated sludge is a composite microbial inoculum diluent and is inoculated by a high-concentration activated sludge method.
Preferably, the sludge inoculation comprises: conveying a certain amount of garbage percolate to a first aerobic barrel, performing aeration treatment, then feeding the garbage percolate into an anoxic barrel, simultaneously adding a composite microbial inoculum diluent into the anoxic barrel, performing reaction, then conveying the garbage percolate to a second aerobic barrel, performing aeration treatment, then refluxing to the first aerobic barrel according to a preset volume proportion, pumping water into a sedimentation barrel, discharging supernatant after sedimentation, and refluxing settled sludge to the second aerobic barrel; after the sewage in the second aerobic barrel is refluxed in a certain volume proportion, the mixture of water and sludge in the sedimentation barrel is used as activated sludge.
As a preferred scheme, the volume ratio of the landfill leachate to the composite microbial inoculum diluent is (3-4): (0.08-0.5).
Compared with the prior art, the invention has the beneficial effects that:
the invention adopts the compound microbial inoculum, has good adaptation to various water quality conditions, adopts specific activation culture conditions, has higher microbial activity and is less influenced by the external environment. Particularly, the method can be quickly adapted to the environment of high-concentration pollutants when the landfill leachate is treated, the activated sludge containing compound microorganisms can be more quickly adapted to the sewage environment after a high-concentration activated sludge method is introduced, the landfill leachate is specifically and efficiently treated, organic matters and nitrogen elements in the wastewater are used as nutrients necessary for the growth of the landfill leachate to grow and reproduce, macromolecular carbohydrates are decomposed and converted into micromolecular inorganic carbon through anaerobic and aerobic steps, nitrogen is finally converted into nitrogen through nitrification and denitrification processes and is discharged, and the COD (chemical oxygen demand) and total nitrogen indexes of the wastewater are reduced.
The invention prepares the activated complex microbial inoculum diluent and controls the sludge and waste liquid reflux process to treat the sewage in the treatment process, so that the activity of the complex microbial inoculum is greatly enhanced, the nitrification and denitrification processes are fully carried out, and the treatment efficiency of the waste liquid is greatly improved.
The method has the advantages of no secondary pollution, low cost, simple and convenient operation, simple and quick culture of the complex microbial inoculum and obvious comprehensive treatment effect on the landfill leachate.
Drawings
FIG. 1 is a flow chart of a method for biochemical treatment of landfill leachate according to an embodiment of the present invention;
FIG. 2 is a flow chart of a high concentration activated sludge inoculation process according to an embodiment of the present invention.
Detailed Description
The technical solution of the present invention will be further explained by the following specific examples.
As shown in fig. 1, the biochemical treatment method of landfill leachate according to the embodiment of the present invention includes the following steps:
s1, conveying the landfill leachate to an anaerobic reactor for anaerobic reaction; specifically, the landfill leachate can be conveyed to an adjusting tank firstly, the adjusting tank controls the landfill leachate to be conveyed to a USAB anaerobic reactor for reaction for a period of time,for example: and 24h, so as to remove macromolecular organic matters. The landfill leachate flows into the anaerobic reactor from the regulating tank, and macromolecular organic matters in the landfill leachate are decomposed into CO by anaerobic microorganisms2、CH4And H2O, the retention time of the sewage in the anaerobic reactor is not less than 24 hours.
And then the wastewater enters a main reaction system, different reaction tanks are arranged in the treatment process of the original wastewater (namely the landfill leachate) of the main reaction system according to the principles of oxygen deficiency and oxygen, and the activated and cultured composite microbial inoculum active diluent and inoculated sludge obtained by a high-concentration activated sludge method are added into a first anaerobic tank.
S2, conveying the waste liquid treated in the step S1 to a first anaerobic pool A1, and adding a composite microbial inoculum diluent and activated sludge;
the preparation process of the composite microbial inoculum diluent of the embodiment of the invention comprises the following steps:
(1) microbial compound bacterial agent
The composite microbial inoculum prepared by mixing a plurality of bacteria in proportion comprises the following components (by weight percent):
the above lactobacilli and prevotella are used as main strains to digest and decompose various organic substances.
The auxiliary strain is used for assisting and promoting the main strain to decompose the organic matters. Helper species, such as: one or more of phosphorus accumulating bacteria, photosynthetic bacteria and nitrifying bacteria.
(2) Composite microbial inoculum diluent
Preparing a compound microbial inoculum stock solution from the microbial compound microbial inoculum, activating, preparing a compound microbial inoculum diluent from the activated compound microbial inoculum stock solution, and sequentially activating and culturing.
The composite microbial inoculum stock solution comprises a microbial composite microbial inoculum, molasses and water, wherein the mass ratio of the microbial composite microbial inoculum to the molasses to the water is 1: (2-10): 100, the activation condition is that the culture is carried out for 5 to 10 days in a sealed way under the completely anaerobic condition;
in addition, the complex microbial inoculum active diluent comprises complex microbial inoculum stock solution, molasses and water, wherein the mass ratio of the complex microbial inoculum stock solution to the molasses to the water is 1: (0.5-2): 50, culturing the seeds under aerobic conditions for 3-8 days under the activation conditions, wherein aeration is needed in the period of 3-10 minutes each time and 2-8 times each day; the culture condition is that the activated compound microbial inoculum active diluent is placed at the constant temperature of 25-40 ℃ for 20-48 h.
In the embodiment of the invention, anaerobic bacteria grow and propagate under the respiration action under the anaerobic condition, gas is generated at the same time, and the cell activity is improved; aerobic bacteria are activated under aerobic conditions, the population quantity is greatly increased, and the population density is obviously improved. The adaptive capacity of the microbial environment in the composite microbial inoculum is greatly improved, bacteria which are more adaptive to extreme temperature environments can be screened out through constant-temperature culture at higher temperature, the bacteria can be rapidly propagated in a large quantity under the condition of sufficient nutrients, the population density reaches a higher level, the microorganisms in the diluent are cultured and activated, the activity of strains is rapidly improved, the reaction process can be accelerated after the bacteria are added into a corresponding reaction system, and the degradation capacity of water pollutants is improved.
The composite microbial inoculum and the culture and activation process thereof have the advantages that the composite microbial inoculum can adapt to complex and variable wastewater environments, and when physical and chemical parameters of wastewater, such as COD, total nitrogen, pH, temperature, DO, ORP and the like, fluctuate within a certain range (even generate large fluctuation), the activity of the composite microbial inoculum of the embodiment of the invention can still be kept at a high level, is less influenced by the external environment, and can normally exert the due efficacy.
The activated sludge of the embodiment of the invention is inoculated with the sludge through the microbial compound bacteria.
Specifically, the sludge inoculation is carried out by a high-concentration activated sludge method, and the specific operations are as follows:
as shown in fig. 2, wastewater to be treated (e.g., landfill leachate) enters a first aerobic barrel (aerobic barrel), enters an anoxic barrel after being aerated for 2-6 hours, meanwhile, a composite microbial inoculum diluent after activation culture is added into the anoxic barrel, enters a second aerobic barrel (aerobic barrel) after being reacted for 2-6 hours, returns to the first aerobic barrel according to the proportion (relative to the volume proportion of inlet water) of 300-400% after being aerated for 2-6 hours, is pumped into a sedimentation barrel, supernatant is discharged after sedimentation for 2-6 hours, sedimentated sludge returns to the second aerobic barrel, the whole sludge inoculation process is in a dynamic balance process, and the reaction system has both inlet water and outlet water. And after 300-400% of the sewage in the second aerobic barrel flows back, the mixture of water and sludge entering the sedimentation barrel can be used as activated sludge and enters an anaerobic tank of the main reaction system for subsequent reaction.
Wherein the volume ratio of the wastewater to be treated to the composite microbial inoculum diluent is (3-4): (0.08-0.5).
In step S2, when the sewage of the anaerobic reactor flows into the first anaerobic tank, the complex microbial inoculum active diluent is added, and denitrification reaction is performed in the first anaerobic tank to primarily denitrify the sewage; controlling the dissolved oxygen in the anaerobic pool within 0.01-1.0 mg/L and controlling the temperature within 28-36 ℃; when a large amount of bubbles appear in the first anaerobic tank, the denitrification reaction is normally carried out, nitrogen is generated, and the pH value of the sewage is increased. Wherein, the addition amount of the composite microbial inoculum active diluent is 3 per mill to 5 per mill (volume percentage content) of the daily treatment amount of the wastewater.
S3, conveying the waste liquid treated in the step S2 to a first aerobic tank O1 for aeration treatment; the dissolved oxygen in the first aerobic tank is controlled to be 2-4 mg/L, and the temperature is controlled to be 22-32 ℃. The first aerobic tank is subjected to nitration reaction to generate nitric acid and nitrate, and the pH value of the sewage is reduced.
S4, conveying the waste liquid treated in the step S2 to a second aerobic tank O2, and carrying out aeration treatment and precipitation; the second aerobic tank not only carries out secondary aeration treatment on the sewage in the first aerobic tank, but also plays a role of a certain sedimentation tank.
S5, returning supernatant of the second aerobic tank to the first anaerobic tank, and returning sludge at the bottom of the second aerobic tank to the first anaerobic tank until the target reaction period is reached.
Specifically, refluxing the supernatant to a first anaerobic tank at a ratio (volume percentage) of 150-400% for reaction; the bottom sludge reflows to the first anaerobic tank according to the proportion (volume percentage) of 80-200% to react; the second anaerobic tank can further denitrify the sewage, and the total nitrogen content in the final effluent is greatly reduced to reach the effluent standard. And (3) refluxing the nitrified substances contained in the supernatant to the first anaerobic tank for denitrification reaction to generate nitrogen, discharging a reaction system, and reducing the total nitrogen content of the wastewater, wherein the control of the reflux ratio of the supernatant is the key for obtaining high-quality effluent according to actual conditions, and the reflux ratio is usually controlled to be 150-400%.
S6, conveying the waste liquid treated by the second anaerobic tank to a membrane-bioreactor (MBR) to separate water and sludge to obtain effluent. Specifically, the sewage (i.e., waste liquid) is passed through a membrane-bioreactor, treated under pressure and discharged, wherein the sludge is retained and returned with the concentrate.
S7, detecting whether the index of the effluent is qualified; if yes, discharging; if not, the process is refluxed to continue. For example: and returning to the first anaerobic pond for further treatment.
The effectiveness of the biochemical treatment method for landfill leachate according to the embodiment of the present invention is verified by two practical application cases.
A landfill yard applies A to landfill leachate2O (anaerobic-anoxic-aerobic) process treatment, and then separating the sewage by adopting a membrane-bioreactor. The parameters and indexes of raw water and effluent of landfill leachate are shown in the following table 1, the total nitrogen content in the effluent far exceeds the discharge index, and the COD and the discharge index are consistent.
TABLE 1 landfill leachate raw water and effluent parameters and indexes
In addition, the landfill leachate discharge standard is shown in table 2 below.
TABLE 2 landfill leachate discharge Standard
Case one:
the biochemical treatment method of the landfill leachate provided by the invention is used for treating the landfill leachate in a landfill in rainy days, and comprises the following specific steps:
1) under the rainy day condition, two different batches of landfill leachate are selected to be divided into a rainy day sample A and a rainy day sample B. The COD and total nitrogen of the raw water were measured, respectively, to obtain the following table 3.
TABLE 3 indices of rainy day sample A and rainy day sample B
| Water sample | Raw water COD (mg/L) | Total nitrogen of raw water (mg/L) |
| Rainy day sample A | 28900 | 2321 |
| Rainy day sample B | 29653 | 2425 |
2) Mixing various bacteria in certain proportion to form the composite microbial inoculum. Uniformly mixing 1 part by weight of composite microbial inoculum, 2 parts by weight of molasses and 100 parts by weight of water to prepare microbial inoculum a. And (3) placing the microbial inoculum a in an anaerobic environment for sealed culture for 10 days to obtain the activated microbial inoculum a. And (3) uniformly mixing 1 part by weight of the activated solution a, 2 parts by weight of molasses and 50 parts by weight of water to prepare a microbial inoculum b. And (3) culturing the microbial inoculum b in an aerobic environment for 3 days, and keeping the dissolved oxygen content at 4mg/L to obtain the activated microbial inoculum b. Culturing in a constant temperature incubator at 35 ℃ for about 1 day to obtain the composite microbial inoculum diluent.
3) And (4) inoculating the sludge by a high-concentration activated sludge method to obtain activated sludge.
4) Setting a regulating tank, an anaerobic reactor, a first anaerobic tank, a first aerobic tank, a second anaerobic tank and a membrane-bioreactor according to the flow shown in figure 1, wherein the landfill leachate enters the system from the regulating tank, flows into the anaerobic reactor and reacts for 24 hours to remove macromolecular organic matters.
5) Adding the compound microbial inoculum diluent prepared in the step 2) and the activated sludge in the step 3) into a first anaerobic tank, wherein the addition amount of the compound microbial inoculum diluent is 2 per mill of the daily treatment amount of the wastewater; the landfill leachate stays in the first anaerobic tank for 24 hours.
6) The landfill leachate flows into a first aerobic tank, is aerated for 24 hours and is stirred once every 30 minutes; and flowing into a second aerobic tank for aeration and sedimentation after 24 hours.
7) And returning supernatant of the second aerobic tank to the first anaerobic tank according to a proportion of 250% for continuous reaction, pumping sludge at the bottom of the second aerobic tank out and returning the sludge to the first anaerobic tank according to a proportion of 125% for reaction, and taking 7 days as a reaction period.
8) After the reaction of the second aerobic tank is finished, the wastewater enters a second anaerobic tank, and after the wastewater stays for 24 hours, the wastewater and the sludge are separated by the membrane-bioreactor to obtain effluent. And (4) discharging the effluent after detection, and if the indexes are not qualified, refluxing to continue the reaction.
Case two:
the biochemical treatment method of the landfill leachate provided by the embodiment of the invention is used for treating the landfill leachate of a landfill site in sunny days, and comprises the following specific steps:
1) under the condition of sunny days, selecting two different batches of landfill leachate to be divided into a sunny day sample C and a sunny day sample D. The COD and total nitrogen of the raw water were measured, respectively, to obtain the following table 4.
TABLE 4 indices of clear day sample C and clear day sample D
| Water sample | Raw water COD (mg/L) | Total nitrogen of raw water (mg/L) |
| Sunny day sample C | 31200 | 2627 |
| Sunny day sample D | 35462 | 2833 |
2) Mixing various bacteria in certain proportion to form the composite microbial inoculum. Uniformly mixing 1 part by weight of composite microbial inoculum, 2 parts by weight of molasses and 100 parts by weight of water to prepare microbial inoculum a. And (3) placing the microbial inoculum a in an anaerobic environment for sealed culture for 10 days to obtain the activated microbial inoculum a. And (3) uniformly mixing 1 part by weight of the activated solution a, 2 parts by weight of molasses and 50 parts by weight of water to prepare a microbial inoculum b. And (3) culturing the microbial inoculum b in an aerobic environment for 3 days, and keeping the dissolved oxygen content at 4mg/L to obtain the activated microbial inoculum b. Culturing in a constant temperature incubator at 35 ℃ for about 1 day to obtain the composite microbial inoculum diluent.
3) And (4) inoculating the sludge by a high-concentration activated sludge method to obtain activated sludge.
4) Setting a regulating tank, an anaerobic reactor, a first anaerobic tank, a first aerobic tank, a second anaerobic tank and a membrane-bioreactor according to the flow shown in figure 1, wherein the landfill leachate enters the system from the regulating tank, flows into the anaerobic reactor and reacts for 24 hours to remove macromolecular organic matters.
5) Adding the compound microbial inoculum diluent prepared in the step 2) and the activated sludge in the step 3) into a first anaerobic tank, wherein the addition amount of the compound microbial inoculum diluent is 2 per mill of the daily treatment amount of the wastewater; the landfill leachate stays in the first anaerobic tank for 24 hours.
6) The landfill leachate flows into a first aerobic tank, is aerated for 24 hours and is stirred once every 30 minutes; and flowing into a second aerobic tank for aeration and sedimentation after 24 hours.
7) And returning supernatant of the second aerobic tank to the first anaerobic tank according to a proportion of 250% for continuous reaction, pumping sludge at the bottom of the second aerobic tank out and returning the sludge to the first anaerobic tank according to a proportion of 125% for reaction, and taking 7 days as a reaction period.
8) After the reaction of the second aerobic tank is finished, the wastewater enters a second anaerobic tank, and after the wastewater stays for 24 hours, the wastewater and the sludge are separated by the membrane-bioreactor to obtain effluent. And (4) discharging the effluent after detection, and if the indexes are not qualified, refluxing to continue the reaction.
And (4) performing index detection on the effluent of the two cases, and making a table by using raw water data and effluent data of four water samples. The four samples come from different batches and different time periods, each sample experiment is independently completed without mutual interference, and the test results are shown in table 5.
TABLE 5 raw water and effluent index comparison of four samples
| Water sample | COD of raw water | Total nitrogen of raw water | COD of effluent | Total nitrogen of effluent |
| Rainy day sample A | 28900 | 2321 | 212 | 15.1 |
| Rainy day sample B | 29653 | 2425 | 223 | 18.3 |
| Sunny day sample C | 31200 | 2627 | 261 | 19.6 |
| Sunny day sample D | 35462 | 2833 | 287 | 21.4 |
Note: the COD and the total nitrogen unit are both mg/L.
Through the test, the effluent COD removal rate of the rainy day sample A is about 99.3%, and the total nitrogen removal rate is about 99.3%; the COD removal rate of the effluent of the rainy day sample B is about 99.2 percent, and the total nitrogen removal rate is about 99.2 percent; the COD removal rate of effluent of a sunny day sample C is about 99.2 percent, and the total nitrogen removal rate is about 99.3 percent; the removal rate of the effluent of the sample D in a sunny day is about 99.2%, and the total nitrogen removal rate is about 99.2%. The average COD removal rate of the effluent is about 99.25 percent, and the total nitrogen removal rate is about 99.25 percent.
The COD removal rate of effluent of the existing process of a certain refuse landfill is about 97.5-98.3%, and the total nitrogen removal rate is about 75-90%. In conclusion, compared with the prior art, the treatment capacity of COD and total nitrogen is improved, and the treatment capacity is not reduced under the condition that the COD and the total nitrogen of raw water are improved, so the method has better comprehensive treatment capacity on the landfill leachate.
The foregoing has outlined rather broadly the preferred embodiments and principles of the present invention and it will be appreciated that those skilled in the art may devise variations of the present invention that are within the spirit and scope of the appended claims.
Claims (10)
1. A biochemical treatment method of landfill leachate is characterized by comprising the following steps:
s1, conveying the landfill leachate to an anaerobic reactor for anaerobic reaction;
s2, conveying the waste liquid treated in the step S1 to a first anaerobic pool, and adding a composite microbial inoculum diluent and activated sludge;
s3, conveying the waste liquid treated in the step S2 to a first aerobic tank for aeration treatment;
s4, conveying the waste liquid treated in the step S2 to a second aerobic tank, and carrying out aeration treatment and precipitation;
s5, returning supernatant of the second aerobic tank to the first anaerobic tank, and returning sludge at the bottom of the second aerobic tank to the first anaerobic tank until a target reaction period is reached;
s6, conveying the waste liquid treated by the second anaerobic tank to a membrane-bioreactor to separate water and sludge to obtain effluent.
2. The biochemical treatment method for landfill leachate according to claim 1, further comprising the steps of:
s7, detecting whether the index of the effluent is qualified; if yes, discharging; if not, the process is refluxed to continue.
3. The biochemical treatment method for landfill leachate according to claim 1, wherein the complex microbial inoculum diluent comprises complex microbial inoculum stock solution, molasses and water, and the mass ratio of the complex microbial inoculum stock solution to the molasses to the water is 1: (0.5-2): 50.
4. the biochemical treatment method for landfill leachate according to claim 3, wherein the complex microbial inoculum stock solution comprises complex microbial inoculum, molasses and water in a mass ratio of 1: (2-10): 100.
5. the biochemical treatment method for landfill leachate according to claim 4, wherein the complex microbial inoculum comprises the following components in percentage by weight: 55-64% of lactobacillus, 20-25% of prevotella, 1.5-5% of acetobacter, 0.5-2% of candida boidinii, 0.5-1.8% of veillonella, 0.24-1.2% of rhodospirillum and 1-22.26% of auxiliary strains.
6. The biochemical treatment method for landfill leachate according to claim 4 or 5, wherein the preparation of the complex microbial inoculum diluent comprises the following steps:
s10, preparing a complex microbial inoculum, molasses and water into a complex microbial inoculum stock solution, and activating;
and S20, preparing the activated composite bacterial agent stock solution, molasses and water into composite bacterial agent diluent, and sequentially activating and culturing.
7. The biochemical treatment method for landfill leachate according to claim 6, wherein the activation process in step S10 is: placing the culture medium in a completely anaerobic environment for sealed culture for 5-10 days; the activation process in step S20 is: culturing for 3-8 days in an aerobic environment, and carrying out aeration treatment in the period; the culture process in the step S20 comprises the following steps: and (3) placing the activated compound microbial inoculum diluent at a constant temperature of 25-40 ℃ for culturing for 20-48 h.
8. The biochemical treatment method for landfill leachate according to any one of claims 1-7, wherein the activated sludge is a composite microbial inoculum diluent and is inoculated by a high-concentration activated sludge method.
9. The biochemical treatment method for landfill leachate according to claim 8, wherein the sludge inoculation comprises: conveying a certain amount of garbage percolate to a first aerobic barrel, performing aeration treatment, then feeding the garbage percolate into an anoxic barrel, simultaneously adding a composite microbial inoculum diluent into the anoxic barrel, performing reaction, then conveying the garbage percolate to a second aerobic barrel, performing aeration treatment, then refluxing to the first aerobic barrel according to a preset volume proportion, pumping water into a sedimentation barrel, discharging supernatant after sedimentation, and refluxing settled sludge to the second aerobic barrel; after the sewage in the second aerobic barrel is refluxed in a certain volume proportion, the mixture of water and sludge in the sedimentation barrel is used as activated sludge.
10. The biochemical treatment method for landfill leachate according to claim 9, wherein the volume ratio of landfill leachate to complex microbial inoculum diluent is (3-4): (0.08-0.5).
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