CN112299561A - Landfill leachate short-cut nitrification and denitrification treatment method - Google Patents
Landfill leachate short-cut nitrification and denitrification treatment method Download PDFInfo
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Abstract
The invention discloses a short-cut nitrification and denitrification nitrogen removal treatment method for landfill leachate, and belongs to the technical field of water pollution prevention and control. According to the invention, a UASB denitrification reactor is used as a denitrification unit, raw garbage percolate and reflux nitrifying liquid are mixed and enter the UASB denitrification reactor, and then water discharged from the denitrification unit enters an aerobic nitrosation system through a point-by-point water inlet mode to carry out biological nitrosation reaction; finally, denitrification is realized through the reflux of the nitrified liquid and the denitrification of microorganisms. The invention realizes the separation and accumulation of denitrifying bacteria and nitrosobacteria and the high-density culture of the two microorganisms, and compared with the method that the concentration of free ammonia FA in the system is reduced to a proper range before point-by-point water inlet and after point-by-point water inlet, the invention reduces the inhibition on nitrosomicroorganisms and improves the activity of the nitrosomicroorganisms in the system.
Description
Technical Field
The invention relates to a short-cut nitrification and denitrification nitrogen removal treatment method for landfill leachate, and belongs to the technical field of water pollution prevention and control.
Background
For a long time, the treatment of municipal waste in China is mainly sanitary landfill. Compared with other treatment modes, the sanitary landfill treatment method has the advantages of low cost and simple and convenient operation. However, practical experience of years shows that the landfill not only occupies a large amount of land, but also causes pollution to the air around the landfill site; more importantly, a large amount of landfill leachate is generated in the landfill process and needs to be treated. The landfill leachate has high ammonia nitrogen concentration, especially the old landfill leachate has the characteristic of high ammonia nitrogen to low carbon nitrogen ratio, and the traditional denitrification method is often faced with the problems of high energy consumption, insufficient carbon source and the like. How to treat landfill leachate economically and effectively remains a challenge.
Biological denitrification is a relatively economical and effective method. In the traditional biological treatment process, high-concentration ammonia nitrogen is removed through complete nitrification and denitrification reactions. However, the high ammonia nitrogen concentration and the low carbon-nitrogen ratio lead to the need of a large amount of aeration in the nitrification process and high energy consumption, and meanwhile, a large amount of carbon sources need to be added in the denitrification process, so the denitrification cost is high. The short-cut nitrification and denitrification directly utilizes nitrite nitrogen to carry out denitrification by controlling the nitrification process in the nitrosation stage, shortens the reaction process, can accelerate the reaction speed, and saves about 20 percent of aeration amount and about 40 percent of organic carbon source. In the treatment of high ammonia nitrogen wastewater, the inhibition difference of Free Ammonia (FA) on Ammonia Oxidizing Bacteria (AOB) and Nitrite Oxidizing Bacteria (NOB) is often utilized to realize short-cut nitrification. However, old landfill leachate has high alkalinity, water quality is often alkaline, high-concentration FA is easily generated after entering a biological denitrification system, FA has strong biological toxicity, and the high-concentration FA has obvious inhibition effect on AOB and NOB, so that the nitrosation rate of the system is low, and the denitrification efficiency of the system is low. Therefore, the FA concentration is reduced, the inhibition effect of the FA concentration on AOB is reduced, and the method is very important for the efficient removal of ammonia nitrogen.
Currently, the commonly used method for reducing the FA concentration is to dilute raw water so as to reduce inhibition, but the method needs to increase an adjusting tank, increases the capital construction cost, needs the investment of supporting facilities and increases the cost of sewage treatment. Secondly, the concentration of FA required to dilute raw water can inhibit NOB bacteria and does not seriously inhibit AOB bacteria, and the actual water quality and water quantity of the landfill leachate vary greatly, so that the operation is not convenient enough.
In addition, the denitrification process is usually completed through two stages of nitrification and denitrification, two types of microorganisms, namely heterotrophic bacteria (decarburization and denitrification) and autotrophic bacteria (nitrification), are required to complete the denitrification process, the microorganisms have different physiological habits and respectively have optimal growth environmental conditions, but in the traditional denitrification process, the two types of microorganisms are required to be subjected to aerobic-anoxic environments to influence the exertion of the functions of the respective microorganisms.
Disclosure of Invention
In order to solve at least one problem, the invention reasonably distributes the substrate concentration of each part entering the shortcut nitrification system by a multi-point water inlet mode, reduces the FA concentration while reducing the nutrient load and improving the sludge concentration so as to reduce the inhibition of FA on AOB, improve the specific growth advantage of nitrosobacteria and enhance the nitrosation performance and denitrification efficiency of the system. Meanwhile, a double-sludge system is adopted to separate nitrosobacteria and denitrifying bacteria, so that the advantages of the nitrosobacteria and the denitrifying bacteria are favorably exerted respectively, and the denitrification efficiency is improved.
The invention aims to provide a short-cut nitrification and denitrification treatment method for landfill leachate, which is a UASB denitrification-point water inlet short-cut nitrification combination and comprises the following steps:
(1) adopting a UASB denitrification reactor as a denitrification unit and adopting a multi-grid aerobic tank as a short-cut nitrification unit; distributing the effluent of the UASB denitrification reactor to different cell units of the short-cut nitrification reaction unit in a point-by-point water inlet mode for nitrification reaction;
(2) part of the effluent of the short-cut nitrification reaction unit is discharged, and part of the effluent flows back to the denitrification unit to be mixed with raw garbage percolate, so as to realize denitrification in the UASB denitrification reactor; one part of the sludge flows back to the front end of the shortcut nitrification unit for microbial inoculation, and meanwhile, the circulation of nitrosobacteria in the shortcut nitrification unit is realized; part of sludge is discharged as residual sludge periodically;
(3) mixing raw garbage leachate with effluent of the reflowing shortcut nitrification unit, and then feeding the mixture into a UASB denitrification reactor for denitrification reaction;
and (3) the short-cut nitrification and denitrification treatment of the landfill leachate is realized by repeating the steps (1) to (3).
In one embodiment of the invention, the shortcut nitrification unit in the step (1) adopts a multi-stage aeration system, the aeration tank is divided into 2 to 4 compartments with equal volume or more for operation, the concentration of dissolved oxygen is controlled to be less than 1.0mg/L, and the temperature of the reactor is controlled to be 30 +/-1 ℃ so as to be beneficial to realizing stable nitrosation.
In one embodiment of the invention, the effective volume ratio of the denitrification unit and the short-cut nitrification unit in the step (1) is 1: 4.
in one embodiment of the invention, in the shortcut nitrification unit in the step (1), the inlet water (UASB outlet water) enters the front ends of different divisions of the aerobic tank in a point-to-point water inlet mode, so that the nutrient load and the free ammonia concentration of the system are reduced, and the nitrosation rate is increased.
In one embodiment of the invention, in the shortcut nitrification unit in the step (1), the optimization condition of the point-to-point water inlet is that the UASB effluent is treated according to the ratio of 1: 1 enters the front ends of the front two divisions of the aerobic tank.
In one embodiment of the invention, the nitration reaction in the step (1) is to remove organic matters in the leachate and convert ammonia nitrogen into nitrite nitrogen.
In one embodiment of the invention, the water intake and return are precisely controlled using a sewage lift pump.
In one embodiment of the present invention, the sludge reflux ratio (the ratio of the mass of the sludge reflux to the mass of the influent water) in the step (2) is 100%.
In one embodiment of the invention, the effluent reflux ratio (the volume ratio of effluent to feed water of the shortcut nitrification unit) of the shortcut nitrification unit in the step (3) is 100-600%.
In one embodiment of the invention, the denitrification reaction in the step (3) is to remove part of organic matters and nitrite nitrogen in the nitrified liquid to realize an anoxic denitrification process; meanwhile, interception and high-density culture of denitrification sludge are realized in UASB so as to improve denitrification efficiency.
In one embodiment of the invention, the UASB denitrification-partial point water inlet short-cut nitrification system is started to operate after being inoculated with microorganisms, inoculated sludge is taken from an aerobic pool of a landfill leachate treatment center, the inoculation sludge concentration of a short-cut nitrification unit is 3g/L, and the inoculation sludge concentration of a denitrification unit is 10 g/L.
In an embodiment of the invention, raw landfill leachate and return nitrification liquid in the denitrification unit are mixed and enter the UASB denitrification reactor, denitrification is performed by using a carbon source in the raw landfill leachate, and alkalinity is provided for subsequent nitrification, so that the microbial concentration and denitrification rate of the denitrification unit can be increased. Microorganisms in the UASB denitrification reactor can grow in a suspended state, and different fillers can be filled in the UASB denitrification reactor to serve as carriers for the growth of the microorganisms, so that the attachment growth of the microorganisms is realized; denitrifying bacteria are trapped in the UASB denitrification reactor and cultured at high density to increase the denitrification rate.
In one embodiment of the invention, in the shortcut nitrification unit, the microorganisms can grow in a suspended state, and different fillers can be filled in the reactor as carriers for the growth of the microorganisms, so that the attached growth of the microorganisms is realized. The nitrosobacteria always circulate in the short-cut nitrification unit without undergoing a denitrification process, so that the activity of the nitrosobacteria is kept, and the nitrosation reaction process is facilitated.
The second purpose of the invention is a method for reducing the concentration of free ammonia in landfill leachate by point water inlet, which comprises the following steps:
(1) adopting a UASB denitrification reactor as a denitrification unit and adopting a multi-grid aerobic tank as a short-cut nitrification unit; distributing the effluent of the UASB denitrification reactor to different cell units of the short-cut nitrification reaction unit in a point-by-point water inlet mode for nitrification reaction;
(2) part of the effluent of the short-cut nitrification reaction unit is discharged, and part of the effluent flows back to the denitrification unit to be mixed with raw leachate, so as to realize denitrification in the UASB denitrification reactor; one part of the sludge flows back to the front end of the shortcut nitrification unit for microbial inoculation, and meanwhile, the circulation of nitrosobacteria in the shortcut nitrification unit is realized; part of sludge is discharged as residual sludge periodically;
(3) mixing raw garbage leachate with effluent of the refluxing shortcut nitrification unit, and adding the mixture into a UASB denitrification reactor for denitrification reaction;
and (3) repeating the steps (1) and (3) to realize the reduction of the concentration of the free ammonia in the landfill leachate.
The invention has the beneficial effects that:
(1) the invention provides a short-range nitrification and denitrification method for landfill leachate, which solves the problem of serious inhibition of FA on AOB, improves the nitrosation rate of a system, enhances the system load and the denitrification efficiency, and has good guiding effect on practical application.
(2) By utilizing the method to treat the aged landfill leachate, the FA concentration in the first two lattices (O1 and O2 pools) of the nitrosation system unit is reduced to 7.91 and 5.81mg/L by adopting a point-by-point water inlet mode, the inhibition of FA on AOB is reduced, the total nitrogen removal rate (NRE) is improved by 52.93 percent, the total nitrogen volume load is improved by 23.5 percent, and the total nitrogen removal rate reaches about 80 percent after carbon source supplement.
Drawings
FIG. 1 is a flow chart of a short-cut nitrification and denitrification process.
FIG. 2 shows the start-up and operation of a shortcut nitrification-denitrification system, wherein (a) shows the effect of removing ammonia nitrogen from landfill leachate; (b) is the nitrite nitrogen change in the denitrification system.
FIG. 3 is the influence of point-divided water inflow on the operation performance of a short-cut nitrification and denitrification system; wherein (a) is the change in the removal rate of ammonia nitrogen; (b) is the change of the concentration of nitrite nitrogen; (c) is the change in total nitrogen removal.
FIG. 4 shows the FA and pH changes in the single-point water inlet and the partial water inlet shortcut nitrification-denitrification system; wherein (a) is single point water intake; (b) is divided point water inlet.
Detailed Description
The following description of the preferred embodiments of the present invention is provided for the purpose of better illustrating the invention and is not intended to limit the invention thereto.
The test method comprises the following steps:
nitrite nitrogen accumulation rate: the calculation formula is as shown in formula (1):
wherein [ NO ]2 --N]And [ NO3 --N]Respectively NO in the reactor2 --N and NO3 -Concentration of-N (mg. L)-1)。
Concentration of free ammonia: the calculation formula is as shown in formula (2):
in the formula, NH4 +N is NH in the reactor4 +Concentration of-N (mg. L)-1) And T is the temperature (. degree. C.) in the reactor.
The ammonia nitrogen oxidation rate: the calculation formula is as shown in formula (3):
in the formula, NH4 +-NeffAnd TNeffRespectively NH in the reactor effluent4 +Concentration of-N and TN (mg. L)-1)，NH4 +-NinfAnd TNinfRespectively NH in the reactor feed water4 +Concentration of-N and TN (mg. L)-1) HRT is the reactor hydraulic residence time (h).
Ammonia nitrogen removal: the calculation formula is as shown in formula (4):
total nitrogen removal: the calculation formula is as shown in formula (5):
in the formula, TNinfThe TN concentration (mg. L) in the feed water was determined-1)，TNeffIs TN concentration (mg. L) in the effluent-1)
Total nitrogen volume loading: the calculation formula is as shown in formula (6):
in the formula, VinfIs the daily water inflow (L), V is the effective volume (L) of the reactor, and HRT is the hydraulic retention time (h) of the reactor.
The water used in the embodiment is aged landfill leachate, which is taken from a regulating reservoir of a certain landfill leachate treatment center in the tin-free city, and the specific water quality index is shown in table 1. The experimental water quality fluctuation is large, the experimental water quality is alkaline, high-concentration ammonia nitrogen and total nitrogen are contained, and the C/N is about 1.5.
TABLE 1 landfill leachate Water quality characteristics
Example 1 UASB denitrification-Split Point Water inflow shortcut nitrification combination
A landfill leachate short-cut nitrification denitrification denitrogenation system, adopt UASB denitrification reactor as the denitrification unit, adopt 4 grades/check aerobic tanks (the aerobic tank divides into O1, O2, O3 and O4, four checks altogether) as the short-cut nitrification unit; the effective volume ratio of the two is 1: and 4, combining the UASB denitrification and the point-feed short-cut nitrification denitrification process.
As shown in figure 1, the UASB denitrification reactor adopts a cylindrical structure, water enters from the lower part and exits from the upper part, and generated nitrogen is discharged from the top of a gas collecting chamber. The UASB denitrification reactor is used for feeding water to mix raw garbage leachate with effluent of the reflowing short-cut nitrification unit, denitrification is carried out by utilizing a carbon source in the raw garbage leachate, nitrate nitrogen and nitrite nitrogen in the effluent of the reflowing short-cut nitrification unit are removed, total nitrogen removal is realized, and meanwhile alkalinity is provided for subsequent nitrification. An external circulating pump is adopted to circulate the mixed liquid in the UASB denitrification reactor, the ascending flow rate of the sludge in the UASB denitrification reactor is improved, the sludge is in a good suspension state, and the temperature of the UASB denitrification reactor is maintained at 30 +/-1 ℃.
The short-cut nitrification unit (aerobic tank) is of a square water tank structure, 4 grids with equal length are connected in series along the length direction, the aerobic tank is connected with the sedimentation tank, and the effluent is discharged after mud-water separation. The inlet water of the shortcut nitrification unit is the outlet water of the UASB denitrification reactor, aerobic nitrosation reaction is carried out in the aerobic tank, partial organic matters in the landfill leachate are removed, and ammonia nitrogen is converted into nitrite nitrogen and nitrate nitrogen. The concentration of dissolved oxygen is controlled to be less than 1.0mg/L by the shortcut nitrification unit, and the temperature of the reactor is controlled to be 30 +/-1 ℃ so as to be beneficial to forming a stable nitrosation process. Returning a part of muddy water mixture in the O4 pool or effluent of the sedimentation tank after the short-cut nitrification unit to the UASB denitrification reactor, mixing with raw garbage percolate, and then performing denitrification in the UASB denitrification reactor to remove nitrite nitrogen and nitrate nitrogen in the mixture; the reflux ratio of the effluent of the short-cut nitrification unit is 100-600%. One part of sludge in the sedimentation tank flows back to the front end of the shortcut nitrification unit and is mixed with effluent of the UASB denitrification reactor to provide microorganisms for the shortcut nitrification unit, and the sludge reflux ratio is 100%; and (4) discharging the residual sludge periodically.
Before the reaction runs, each unit needs to be inoculated with a microorganism. Wherein the concentration of the inoculated sludge in the aeration tank (O1-O4) is 3g/L, and the concentration of the inoculated sludge in the UASB is 10 g/L.
Example 2
Starting the landfill leachate short-cut nitrification and denitrification nitrogen removal system in the embodiment 1;
the landfill leachate shortcut nitrification and denitrification nitrogen removal system is rapidly operated by gradually increasing the water inflow, the DO concentration is controlled to be lower than 1.0mg/L, the sludge reflux ratio is 100%, and the effluent of the shortcut nitrification unit and the reflux ratio of the O4 tank are 100% respectively. The load is always increased until the UASB denitrification reactor collapses; the system is then restored to steady operation.
During the start-up of the biological denitrification system, the ammonia nitrogen removal rate rapidly increases after a period of adaptation (fig. 2). Under the optimal conditions (the temperature is about 30 ℃, the sludge reflux ratio is 100 percent, the nitrifying liquid reflux ratio is 100 percent, the O4 pool reflux ratio is 100 percent, and the dissolved oxygen concentration is less than 1mg/L), the Hydraulic Retention Time (HRT) is 6.25d, the ammonia nitrogen removal rate reaches about 92.57 percent, the ammonia nitrogen oxidation rate (AOR) reaches 12.57 mg/(L.h), and the nitrite Nitrogen Accumulation Rate (NAR) is 84.97 percent.
Therefore, the shortcut nitrification-denitrification system is successfully started by controlling the DO concentration to be less than 1.0 mg/L.
EXAMPLE 3 Split Point Water feed
After the landfill leachate shortcut nitrification and denitrification nitrogen removal system in embodiment 1 is successfully started, effluent of the UASB denitrification reactor is treated according to a flow ratio of 1: 1 point enters a short-cut nitrification unit O1 and O2 pool to reduce the influence of Free Ammonia (FA) in the system on nitrosobacteria. The whole system is continuously operated, and the hydraulic retention time HRT of the system is continuously reduced during operation until the optimal state is reached (the HRT is shortened until the system is broken down (the ammonia nitrogen removal rate is 80 percent as a benchmark), and then the HRT before the breakage is optimal).
Comparative example 1 Single-Point Water intake
After the landfill leachate shortcut nitrification-denitrification nitrogen removal system in example 1 is successfully started, effluent of the UASB denitrification reactor enters a shortcut nitrification unit O1 pool, the whole system is kept running continuously, and the hydraulic retention time HRT of the system is continuously reduced during running until the system is in an optimal state (the HRT is shortened until the system is about to crash (the ammonia nitrogen removal rate is 80% as a reference), and then the HRT before the crash is optimal).
The influent water samples of example 3 and comparative example 1 were subjected to performance tests, the results of which are shown in fig. 3 and 4:
as can be seen from fig. 3 and 4: after the operation is carried out by adopting a point-dividing water inlet mode, when the HRT is 5.5d, the ammonia nitrogen removal rate still reaches 89.86 percent, the total nitrogen removal rate NRE reaches 27.62 percent, and the ammonia nitrogen removal rate is improved by 52.93 percent compared with single-point water inlet (before point-dividing water inlet) (18.06 percent). When HRT is shortened to 5d, the ammonia nitrogen removal rate is still higher than 81.25 percent, and the average total nitrogen volume load (NLR) of the system is 0.42 kg/(m)3D) 24.16% improvement over before split-point flooding operation. The FA concentration in the O1 and O2 pools is respectively reduced to 7.91 and 5.81mg/L under the condition of point-divided water inlet, compared with the FA concentration in the O1 and O2 pools before point-divided water inlet, the FA concentration is greatly reduced, and under the concentration, the NOB can be effectively inhibited, and the AOB can not be seriously inhibited. After the carbon source is supplemented to the denitrification system according to the ratio of C/N to 4, the total nitrogen removal rate of the system is rapidly improved to about 80 percent (stage V).
Comparative example 2 No double mud System
The landfill leachate is treated by adopting the short-cut nitrification and denitrification process based on the A/O process, the sewage, the returned nitrification liquid and the sludge enter the anoxic tank together, the dissolved oxygen is controlled to be about 2mg/L, and the temperature is 30 +/-2 ℃, so that the stable short-cut nitrification and denitrification is realized. See the literature specifically (Lijun, Penfeng, and construction, etc.. research on the treatment of low C/N landfill leachate by short-cut nitrification-denitrification process [ C ]// China civil engineering institute% China town Water supply Association, national drainage Committee, annual collection of 2006, 2006: 229. 235.).
The test shows that: the nitrosation rate is 83 percent, and the ammonia nitrogen removal rate is 85 percent. The carbon source was supplemented at a C/N ratio of 5, and the total nitrogen removal rate was about 61% under the condition of controlling the reflux ratio to 4.
Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A landfill leachate short-cut nitrification denitrification denitrogenation processing method, wherein the said method is UASB denitrification-partial point water inflow short-cut nitrification combination, including the following step:
(1) adopting a UASB denitrification reactor as a denitrification unit and adopting a multi-grid aerobic tank as a short-cut nitrification unit; distributing the effluent of the UASB denitrification reactor to different cell units of the short-cut nitrification reaction unit in a point-by-point water inlet mode for nitrification reaction;
(2) part of the effluent of the short-cut nitrification reaction unit is discharged, and part of the effluent flows back to the denitrification unit to be mixed with raw garbage percolate, so as to realize denitrification in the UASB denitrification reactor; one part of the sludge flows back to the front end of the shortcut nitrification unit for microbial inoculation, and meanwhile, the circulation of nitrosobacteria in the shortcut nitrification unit is realized; part of sludge is discharged as residual sludge periodically;
(3) mixing raw garbage leachate with effluent of the reflowing shortcut nitrification unit, and then feeding the mixture into a UASB denitrification reactor for denitrification reaction;
and (3) the short-cut nitrification and denitrification treatment of the landfill leachate is realized by repeating the steps (1) to (3).
2. The method according to claim 1, wherein the shortcut nitrification unit in the step (1) adopts a multi-stage aeration system, the aeration tank is divided into 2 to 4 compartments or more with equal volume to operate, the concentration of dissolved oxygen is controlled to be less than 1.0mg/L, and the temperature of the reactor is controlled to be 30 +/-1 ℃ so as to facilitate the realization of stable nitrosation.
3. The process according to claim 1 or 2, wherein the effective volume ratio of the denitrification unit and the short-cut nitrification unit of step (1) is 1: 4.
4. the method according to any one of claims 1 to 3, wherein in the shortcut nitrification unit of step (1), the optimization condition of the point-to-point water inlet is that the UASB water outlet is in a ratio of 1: 1 enters the front ends of the front two divisions of the aerobic tank.
5. The method according to any one of claims 1 to 4, wherein the sludge reflux ratio in step (2) is 100%.
6. The method according to any one of claims 1 to 5, wherein the effluent reflux ratio of the short-cut nitrification unit in the step (3) is 100 to 600 percent.
7. The method according to any one of claims 1 to 6, wherein the UASB denitrification-partial point-feed shortcut nitrification system is started after inoculation of microorganism, the inoculated sludge is taken from an aerobic pool of a landfill leachate treatment center, the concentration of the inoculated sludge in the shortcut nitrification unit is 3g/L, and the concentration of the inoculated sludge in the denitrification unit is 10 g/L.
8. The method of any one of claims 1 to 7, wherein the influent and return flows are precisely controlled using a sewage lift pump.
9. The method for reducing the concentration of free ammonia in landfill leachate by point-by-point water inflow is characterized by comprising the following steps of:
(1) adopting a UASB denitrification reactor as a denitrification unit and adopting a multi-grid aerobic tank as a short-cut nitrification unit; distributing the effluent of the UASB denitrification reactor to different cell units of the short-cut nitrification reaction unit in a point-by-point water inlet mode for nitrification reaction;
(2) part of the effluent of the short-cut nitrification reaction unit is discharged, and part of the effluent flows back to the denitrification unit to be mixed with raw leachate, so as to realize denitrification in the UASB denitrification reactor; one part of the sludge flows back to the front end of the shortcut nitrification unit for microbial inoculation, and meanwhile, the circulation of nitrosobacteria in the shortcut nitrification unit is realized; part of sludge is discharged as residual sludge periodically;
(3) mixing raw garbage leachate with effluent of the refluxing shortcut nitrification unit, and adding the mixture into a UASB denitrification reactor for denitrification reaction;
and (3) repeating the steps (1) and (3) to realize the reduction of the concentration of the free ammonia in the landfill leachate.
10. The method according to claim 9, wherein in the shortcut nitrification unit in step (1), the optimization condition of the point-to-point water inlet is that the UASB water outlet is in a ratio of 1: 1 enters the front ends of the front two divisions of the aerobic tank.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114890630A (en) * | 2022-06-07 | 2022-08-12 | 广东新湾江生态环境技术有限公司 | Process and device for treating wastewater by mixing kitchen wastewater serving as carbon source with leachate |
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