CN113716697A - Method and device for realizing deep denitrification of landfill leachate by using double short-range combined process - Google Patents
Method and device for realizing deep denitrification of landfill leachate by using double short-range combined process Download PDFInfo
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Abstract
利用双短程组合工艺实现垃圾渗滤液深度脱氮的方法和装置，属于高氨氮污水污泥生物处理领域。垃圾渗滤液首先进入短程硝化‑厌氧氨氧化一体化反应器，以短时缺氧(2h)、长时低氧曝气(38h)的模式运行，缺氧段发生反硝化用于去除上周期剩余的亚硝态氮和硝态氮；好氧段发生同步短程硝化和厌氧氨氧化并产生氮气。此反应器出水携带氨氮和硝态氮泵入短程反硝化‑厌氧氨氧化一体化反应器，以厌氧(15h)搅拌方式运行，并在周期初投加剩余污泥发酵液将硝态氮转化为亚硝态氮；利用亚硝态氮和氨氮进行厌氧氨氧化反应。本发明在进水氨氮为822.2±14.1mg/L的情况下，总氮去除率可达97.6±1.5％，出水总氮为14.0±2.0mg/L，且污泥减量率高达30.8％，适用于高氨氮废水的深度去除。
A method and a device for realizing deep denitrification of landfill leachate by using a double short-range combined process belong to the field of biological treatment of sewage sludge with high ammonia nitrogen. The landfill leachate first enters the short-range nitrification-anammox integrated reactor, and operates in the mode of short-term hypoxia (2h) and long-term hypoxia aeration (38h), and denitrification occurs in the hypoxia section to remove the previous cycle Remaining nitrite nitrogen and nitrate nitrogen; simultaneous short-range nitrification and anaerobic ammonium oxidation occur in the aerobic section and produce nitrogen. The effluent of this reactor carries ammonia nitrogen and nitrate nitrogen and is pumped into the short-range denitrification-anaerobic ammonium oxidation integrated reactor, which is operated in an anaerobic (15h) stirring mode, and at the beginning of the cycle, excess sludge fermentation broth is added to remove nitrate nitrogen. It is converted into nitrite nitrogen; anaerobic ammonia oxidation reaction is carried out using nitrite nitrogen and ammonia nitrogen. Under the condition that the influent ammonia nitrogen is 822.2±14.1mg/L, the total nitrogen removal rate of the present invention can reach 97.6±1.5%, the effluent total nitrogen is 14.0±2.0mg/L, and the sludge reduction rate is as high as 30.8%. In-depth removal of high ammonia nitrogen wastewater.
Description
Technical Field
The invention relates to a method and a device for treating landfill leachate by combining a two-stage combined process of shortcut nitrification-anaerobic ammonia oxidation and shortcut denitrification-anaerobic ammonia oxidation with excess sludge fermentation, belonging to the technical field of biological denitrification of high ammonia nitrogen landfill leachate.
Background
In recent years, with the development of economy and the improvement of the living standard of people, the yield of municipal solid waste is continuously increased. The measure of "garbage classification" improves the resource and economic value of garbage, but still cannot remove water in the garbage. Therefore, after the landfill treatment, a large amount of landfill leachate which causes harm to the atmosphere, soil and water sources is still generated. The landfill leachate is wastewater containing high ammonia nitrogen, has the characteristics of complex water quality components, large water quantity change, imbalance of proportion of microbial nutrient elements and the like, and can cause serious pollution to surface water, underground water and soil if not treated properly in time. The traditional biological denitrification is completed through two stages of nitrification and denitrification, but in the nitrification stage, a large amount of energy consumption is consumed in the aeration process; in the denitrification stage, as the biodegradability of the landfill leachate is poor, exogenous organic matters are required to be added to maintain the denitrification process, so that the cost of the drugs in the sewage treatment plant is greatly increased. Therefore, the method for treating the landfill leachate with high efficiency and energy saving is urgently sought.
The discovery of anammox reaction has brought new insights into the nitrogen cycle in nature. It can synchronously convert ammonia nitrogen and nitrite nitrogen into nitrogen and a small amount of nitrate nitrogen. However, a continuous and stable supply source of nitrite nitrogen is a major bottleneck in realizing mainstream anaerobic ammonium oxidation biological treatment of sewage. Both short-cut nitrification (ammonia nitrogen → nitrite nitrogen) and short-cut denitrification (nitrate nitrogen → nitrite nitrogen) can provide nitrite nitrogen for anaerobic ammoxidation. The shortcut nitrification-anaerobic ammonia oxidation reaction is applied to the field of landfill leachate, but nitrate nitrogen is inevitably generated, so that the total nitrogen removal rate reaches 89 percent at most. The short-cut denitrification-anaerobic ammonia oxidation reaction can be used as a second treatment system to further improve the total nitrogen removal rate. Previous studies on shortcut nitrification-anammox and shortcut denitrification-anammox mostly use three or more reactors, which increases the floor space and the operation cost. However, there has been a study on the realization of shortcut nitrification-anammox and shortcut denitrification-anammox in one reactor. However, most of the actual sewage treatment plants are based on two stages of aerobic and anoxic, and the research on the processes of shortcut nitrification-anaerobic ammonia oxidation and shortcut denitrification-anaerobic ammonia oxidation in one reactor may not be suitable for practical situations. Therefore, it is necessary to establish a two-stage process based on shortcut nitrification-anammox and shortcut denitrification-anammox.
In addition, because the available organic matters in the landfill leachate are less, organic matters are required to be added in the treatment process, which can lead to the great increase of heterotrophic bacteria, thus leading to the huge output of residual sludge and adding the cost of sludge disposal. However, fermentation of excess sludge under alkaline conditions produces short chain fatty acids such as: acetic acid, propionic acid, isobutyric acid, n-butyric acid, isovaleric acid, n-valeric acid, and the like. The short-chain fatty acids can be used as organic matters to replace a large amount of added medicines and used as carbon sources for short-range denitrification reaction. Secondly, the excess sludge can reduce 50-60% of the sludge per se while providing organic matters.
A method and a device for treating landfill leachate by combining a two-stage combined process of short-cut nitrification-anaerobic ammonia oxidation and short-cut denitrification-anaerobic ammonia oxidation with excess sludge fermentation belong to the field of biological treatment of high ammonia nitrogen sewage and sludge. The landfill leachate firstly enters a short-range nitrification-anaerobic ammonia oxidation integrated reactor and runs in a short-time anoxic (2h) and long-time hypoxia aeration (38h) mode, and denitrification reaction is carried out in the anoxic stage to remove the residual nitrite nitrogen and nitrate nitrogen in the previous period; in the aerobic stage, synchronous short-cut nitrification and anaerobic ammonia oxidation reactions are carried out to generate nitrogen and a small amount of nitrate nitrogen. Pumping the effluent of the short-cut nitrification-anaerobic ammonia oxidation integrated reactor carrying ammonia nitrogen and nitrate nitrogen into the short-cut denitrification-anaerobic ammonia oxidation integrated reactor, operating in an anaerobic (15h) stirring mode, and adding residual sludge fermentation liquor for the first time in the period to convert the nitrate nitrogen into nitrite nitrogen; and then the nitrite nitrogen and ammonia nitrogen in the inlet water are utilized to carry out anaerobic ammonia oxidation reaction. Under the condition that the ammonia nitrogen in the inlet water is 822.2 +/-14.1 mg/L, the total nitrogen removal rate can reach 97.6 +/-1.5 percent, the total nitrogen in the outlet water is 14.0 +/-2.0 mg/L, the sludge reduction rate is as high as 30.8 percent, and the method is suitable for deep removal of high ammonia nitrogen wastewater.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a method and a device for treating landfill leachate by combining a two-stage combined process of short-cut nitrification-anaerobic ammonia oxidation and short-cut denitrification-anaerobic ammonia oxidation with excess sludge fermentation, and particularly, the landfill leachate firstly enters a short-cut nitrification-anaerobic ammonia oxidation integrated reactor and runs in modes of short-time oxygen deficiency (2h) and long-time oxygen deficiency aeration (38h), and denitrification reaction is carried out in the oxygen deficiency stage to remove the remaining nitrite nitrogen and nitrate nitrogen in the last period; in the aerobic stage, synchronous short-cut nitrification and anaerobic ammonia oxidation reactions are carried out to generate nitrogen and a small amount of nitrate nitrogen. Pumping the effluent of the short-cut nitrification-anaerobic ammonia oxidation integrated reactor carrying ammonia nitrogen and nitrate nitrogen into the short-cut denitrification-anaerobic ammonia oxidation integrated reactor, operating in an anaerobic (15h) stirring mode, and adding residual sludge fermentation liquor for the first time in the period to convert the nitrate nitrogen into nitrite nitrogen; and then the nitrite nitrogen and ammonia nitrogen in the inlet water are utilized to carry out anaerobic ammonia oxidation reaction. Under the condition that the ammonia nitrogen in the inlet water is 822.2 +/-14.1 mg/L, the total nitrogen removal rate can reach 97.6 +/-1.5 percent, the total nitrogen in the outlet water is 14.0 +/-2.0 mg/L, the sludge reduction rate is as high as 30.8 percent, and the method is suitable for deep removal of high ammonia nitrogen wastewater.
The invention is realized by the following technical scheme:
the method and the device for treating the landfill leachate by combining the two-stage combined process of short-cut nitrification-anaerobic ammonia oxidation and short-cut denitrification-anaerobic ammonia oxidation with excess sludge fermentation: comprises a raw water tank (1), a shortcut nitrification-anaerobic ammonia oxidation integrated reactor (2), a degassing water tank (3), a residual sludge alkaline fermentation tank (4), a fermentation liquor storage tank (5), a shortcut denitrification-anaerobic ammonia oxidation integrated reactor (6) and an effluent water tank (7);
the raw water tank is provided with an overflow pipe (1.1) and a water outlet (1.2); the short-cut nitrification-anaerobic ammonia oxidation integrated reactor (2) is provided with a first water inlet peristaltic pump (2.1), a first water inlet (2.2), an air compressor (2.3), a biological membrane carrier filler (2.4), a heating rod (2.5), a first stirrer (2.6), a pH/DO real-time monitoring device (2.7), an aeration sand head (2.8), a first water discharge port (2.9) and a first water outlet peristaltic pump (2.10); the residual sludge alkaline fermentation tank (4) is completely sealed and is externally attached with a heat insulation layer, and is provided with a temperature control device, a magnetic stirrer (4.1), a pH real-time monitoring device (4.2), a first sludge inlet (4.3), a dosing port (4.4) and a first sludge discharge peristaltic pump (4.5); the short-range denitrification-anaerobic ammonia oxidation reactor (6) is provided with a second water inlet peristaltic pump (6.1), a second water inlet (6.2), a heating rod (6.3), a second stirrer (6.4), a pH/DO real-time monitoring device (6.5), a biofilm carrier filler (6.6), a second water outlet (6.7) and a second water outlet peristaltic pump (6.8);
the raw water tank (1) is connected with a first water inlet (2.2) of the shortcut nitrification-anaerobic ammonia oxidation integrated reactor through a first water inlet peristaltic pump (2.1); a first water outlet (2.9) of the shortcut nitrification-anaerobic ammonia oxidation integrated reactor is connected with a water inlet (3.1) of a degassing water tank through a first water outlet peristaltic pump (2.10), and air is pumped into the shortcut nitrification-anaerobic ammonia oxidation integrated reactor (2) through an air compressor (2.3) and an aeration sand head (2.8); a water outlet (3.3) of the degassing water tank is connected with a short-range denitrification-anaerobic ammonia oxidation integrated reactor (6) through a second water inlet peristaltic pump (6.1); the residual sludge alkaline fermentation tank (4) is connected with a fermentation liquor storage tank (5) through a first sludge discharge peristaltic pump (4.5); the fermentation liquor storage tank (5) is connected with the degassing water tank (3); the water outlet tank (7) is connected with a second water outlet (6.7) of the short-range denitrification-anaerobic ammonia oxidation integrated reactor through a second water outlet peristaltic pump (6.8).
The method and the device for treating the landfill leachate by combining the two-stage combined process of short-cut nitrification-anaerobic ammonia oxidation and short-cut denitrification-anaerobic ammonia oxidation with excess sludge fermentation are characterized by comprising the following steps of:
1) starting a shortcut nitrification-anaerobic ammonia oxidation integrated reactor: inoculating the shortcut nitrification-anaerobic ammonia oxidation activated sludge for treating sludge digestive juice in the urban sewage treatment plant into a reactor, wherein the sludge concentration of the mixed liquid is 3000-4000 mg/L. The sludge is continuously run for 30 days in a way of anoxic stirring (10h) for one cycle every day in a water quality adaptation period; then, the operation is carried out in an anoxic (8 h)/aerobic (3 h)/anoxic (8 h)/aerobic (3h) mode, and the dissolved oxygen in the aerobic stage is controlled below 0.05 mg/L. When the nitrite accumulation phenomenon does not occur after the aerobic stage is finished, the operation mode is adjusted to be anoxic (2 h)/aerobic (38h), and the dissolved oxygen in the aerobic stage is still controlled to be below 0.05 mg/L. At the moment, the hydraulic retention time is 80h, active sludge discharge is not carried out, and the temperature is controlled to be 35.0 +/-1.0 ℃. And controlling the mass concentration ratio of ammonia nitrogen to nitrate nitrogen in the effluent at the end of the reactor period to be 1: 1.
2) Starting the residual sludge alkaline fermentation tank: heating and stirring the residual sludge alkaline fermentation tank by using a magnetic stirrer, controlling the retention time of sludge to be 7.5 days, controlling the sludge discharge mode to be one row a day, maintaining the temperature at 40.0 +/-1.0 ℃, monitoring the reaction pH on line, and maintaining the reaction pH at 11.0 +/-0.5 so as to perform alkaline fermentation to generate short-chain fatty acids;
3) starting a short-cut denitrification-anaerobic ammonia oxidation integrated reactor: the return sludge in the municipal sewage treatment plant is inoculated into the reactor, and the sludge concentration of the mixed solution is 3000-4000 mg/L. Firstly, sodium acetate is used as an organic matter to acclimate the short-range denitrification capability of the sludge, and the mass concentration ratio of the organic matter to the total nitrogen after water enters the reactor is controlled to be 3: 1. And then, adding anaerobic ammonia oxidation filler with good activity to couple with short-range denitrification, converting nitrate nitrogen into nitrite nitrogen by short-range denitrification bacteria, and enabling the anaerobic ammonia oxidation bacteria to utilize the nitrite nitrogen and ammonia nitrogen in the inlet water to form good coupling. And then, the step of gradually switching the adding of organic matters is carried out. Under the condition of ensuring that the mass concentration ratio of the organic matters to the total nitrogen is 3:1 after water enters the reactor, the type of the added organic matters is changed from sodium acetate to sodium acetate and fermentation liquor, namely the mass concentration ratio of the sodium acetate to the total nitrogen is 1.5:1, and the mass concentration ratio of short-chain fatty acids to the total nitrogen in the fermentation liquor is also 1.5: 1. The addition of sodium acetate was stopped 16 days after the start of the introduction of the remaining fermentation broth. At the moment, the organic matter is completely provided by the residual sludge fermentation liquor, and the mass concentration ratio of the organic matter to the total nitrogen after water enters the reactor is still maintained to be 3: 1. The residual sludge fermentation liquor is added once per period, and each time is 3-6% of the effective volume of the reactor.
4) Opening a first water inlet peristaltic pump, and pumping the late landfill leachate in the raw water tank into a shortcut nitrification-anaerobic ammonia oxidation integrated reactor, wherein the reactor operates in an anoxic (2 h)/aerobic (38h) mode, namely the following modes: opening the first stirrer after water feeding is finished, entering an anoxic stage, stirring for 2 hours, and closing the first stirrer after the biodegradable organic matters in the raw water are used up; then, a first air compression pump is started to perform aeration, DO is kept below 0.05mg/L through a real-time control device, pH is monitored in real time through a pH control device, and the aeration time is 38 hours; precipitating for 0.5h to separate mud from water, starting a first water outlet peristaltic pump, and discharging water into an intermediate water tank with a water discharge ratio of 50%;
5) opening a second water inlet peristaltic pump, pumping the ammonia nitrogen and nitrate nitrogen wastewater in the intermediate water tank into a short-range denitrification-anaerobic ammonia oxidation integrated reactor, and simultaneously adding residual sludge fermentation mixed liquor, wherein the feed amount of the residual sludge fermentation mixed liquor is 3-6% of the effective volume of the denitrification reactor, and the reactor runs in an anaerobic stirring mode, namely the following mode: and (3) opening a second stirrer to start stirring for 15h after water inflow is finished, simultaneously pumping the residual sludge fermentation mixed liquid, separating mud and water after the reaction is finished and precipitating for 0.5h, opening a second water outlet peristaltic pump, and pumping the supernatant into a water outlet tank, wherein the water discharge ratio is 50%.
The landfill leachate firstly enters a short-range nitrification-anaerobic ammonia oxidation integrated reactor and runs in a short-time anoxic (2h) and long-time hypoxia aeration (38h) mode, and denitrification reaction is carried out in the anoxic stage to remove the residual nitrite nitrogen and nitrate nitrogen in the previous period; in the aerobic stage, synchronous short-cut nitrification and anaerobic ammonia oxidation reactions are carried out to generate nitrogen and a small amount of nitrate nitrogen. Pumping the effluent of the short-cut nitrification-anaerobic ammonia oxidation integrated reactor carrying ammonia nitrogen and nitrate nitrogen into the short-cut denitrification-anaerobic ammonia oxidation integrated reactor, operating in an anaerobic (15h) stirring mode, and adding residual sludge fermentation liquor for the first time in the period to convert the nitrate nitrogen into nitrite nitrogen; and then the nitrite nitrogen and ammonia nitrogen in the inlet water are utilized to carry out anaerobic ammonia oxidation reaction. Under the condition that the ammonia nitrogen in the inlet water is 822.2 +/-14.1 mg/L, the total nitrogen removal rate can reach 97.6 +/-1.5 percent, the total nitrogen in the outlet water is 14.0 +/-2.0 mg/L, the sludge reduction rate is as high as 30.8 percent, and the method is suitable for deep removal of high ammonia nitrogen wastewater.
The invention relates to a method and a device for treating landfill leachate by combining a two-stage combined process of shortcut nitrification-anaerobic ammonia oxidation and shortcut denitrification-anaerobic ammonia oxidation with excess sludge fermentation, which have the following advantages:
(1) according to the invention, by organically combining short-cut nitrification, short-cut denitrification, anaerobic ammonia oxidation and excess sludge fermentation, deep denitrification of the late-stage landfill leachate is realized in the true sense, and the effects of cost saving, deep denitrification and sludge reduction are achieved.
(2) In the short-cut nitrification-anaerobic ammonia oxidation integrated reactor, the short-cut nitrification of ammonia oxidizing bacteria can save 60 percent of aeration quantity, and the anaerobic ammonia oxidizing bacteria have no N in the metabolic process2O is generated, so the greenhouse gas emission of the process is low.
(3) In the short-cut nitrification-anaerobic ammonia oxidation integrated reactor, short-cut denitrifying bacteria can utilize excess sludge fermentation liquor to carry out short-cut denitrification to generate stable nitrite nitrogen, so that the anaerobic ammonia oxidation process is carried out, the investment of additional organic matters is saved, and the reduction of excess sludge is realized.
(4) The process is not provided with a reflux device, saves the cost and is simple to operate.
Drawings
FIG. 1 is a flow chart of a method and a device for treating landfill leachate by combining a two-stage combined process of short-cut nitrification-anaerobic ammonia oxidation and short-cut denitrification-anaerobic ammonia oxidation with excess sludge fermentation
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in figure 1, the method and the device for treating landfill leachate by combining a two-stage combined process of shortcut nitrification-anaerobic ammonia oxidation and shortcut denitrification-anaerobic ammonia oxidation with excess sludge fermentation comprise a raw water tank (1), a shortcut nitrification-anaerobic ammonia oxidation integrated reactor (2), a degassing water tank (3), an excess sludge alkaline fermentation tank (4), a fermentation liquor storage tank (5), a shortcut denitrification-anaerobic ammonia oxidation integrated reactor (6) and an effluent water tank (7);
the raw water tank is provided with an overflow pipe (1.1) and a water outlet (1.2); the short-cut nitrification-anaerobic ammonia oxidation integrated reactor (2) is provided with a first water inlet peristaltic pump (2.1), a first water inlet (2.2), an air compressor (2.3), a biological membrane carrier filler (2.4), a heating rod (2.5), a first stirrer (2.6), a pH/DO real-time monitoring device (2.7), an aeration sand head (2.8), a first water discharge port (2.9) and a first water outlet peristaltic pump (2.10); the residual sludge alkaline fermentation tank (4) is completely sealed and is externally attached with a heat insulation layer, and is provided with a temperature control device, a magnetic stirrer (4.1), a pH real-time monitoring device (4.2), a first sludge inlet (4.3), a dosing port (4.4) and a first sludge discharge peristaltic pump (4.5); the short-range denitrification-anaerobic ammonia oxidation reactor (6) is provided with a second water inlet peristaltic pump (6.1), a second water inlet (6.2), a heating rod (6.3), a second stirrer (6.4), a pH/DO real-time monitoring device (6.5), a biofilm carrier filler (6.6), a second water outlet (6.7) and a second water outlet peristaltic pump (6.8);
the raw water tank (1) is connected with a first water inlet (2.2) of the shortcut nitrification-anaerobic ammonia oxidation integrated reactor through a first water inlet peristaltic pump (2.1); a first water outlet (2.9) of the shortcut nitrification-anaerobic ammonia oxidation integrated reactor is connected with a water inlet (3.1) of a degassing water tank through a first water outlet peristaltic pump (2.10), and air is pumped into the shortcut nitrification-anaerobic ammonia oxidation integrated reactor (2) through an air compressor (2.3) and an aeration sand head (2.8); a water outlet (3.3) of the degassing water tank is connected with a short-range denitrification-anaerobic ammonia oxidation integrated reactor (6) through a second water inlet peristaltic pump (6.1); the residual sludge alkaline fermentation tank (4) is connected with a fermentation liquor storage tank (5) through a first sludge discharge peristaltic pump (4.5); the fermentation liquor storage tank (5) is connected with the degassing water tank (3); the water outlet tank (7) is connected with a second water outlet (6.7) of the short-range denitrification-anaerobic ammonia oxidation integrated reactor through a second water outlet peristaltic pump (6.8).
The specific operation process is as follows:
1) starting a shortcut nitrification-anaerobic ammonia oxidation integrated reactor: inoculating the shortcut nitrification-anaerobic ammonia oxidation activated sludge for treating sludge digestive juice in the urban sewage treatment plant into a reactor, wherein the sludge concentration of the mixed liquid is 3000-4000 mg/L. The sludge is continuously run for 30 days in a way of anoxic stirring (10h) for one cycle every day in a water quality adaptation period; then, the operation is carried out in an anoxic (8 h)/aerobic (3 h)/anoxic (8 h)/aerobic (3h) mode, and the dissolved oxygen in the aerobic stage is controlled below 0.05 mg/L. When the nitrite accumulation phenomenon does not occur after the aerobic stage is finished, the operation mode is adjusted to be anoxic (2 h)/aerobic (38h), and the dissolved oxygen in the aerobic stage is still controlled to be below 0.05 mg/L. At the moment, the hydraulic retention time is 80h, active sludge discharge is not carried out, and the temperature is controlled to be 35.0 +/-1.0 ℃. And controlling the mass concentration ratio of ammonia nitrogen to nitrate nitrogen in the effluent at the end of the reactor period to be 1: 1.
2) Starting the residual sludge alkaline fermentation tank: heating and stirring the residual sludge alkaline fermentation tank by using a magnetic stirrer, controlling the retention time of sludge to be 7.5 days, controlling the sludge discharge mode to be one row a day, maintaining the temperature at 40.0 +/-1.0 ℃, monitoring the reaction pH on line, and maintaining the reaction pH at 11.0 +/-0.5 so as to perform alkaline fermentation to generate short-chain fatty acids;
3) starting a short-cut denitrification-anaerobic ammonia oxidation integrated reactor: the return sludge in the municipal sewage treatment plant is inoculated into the reactor, and the sludge concentration of the mixed solution is 3000-4000 mg/L. Firstly, sodium acetate is used as an organic matter to acclimate the short-range denitrification capability of the sludge, and the mass concentration ratio of the organic matter to the total nitrogen after water enters the reactor is controlled to be 3: 1. And then, adding anaerobic ammonia oxidation filler with good activity to couple with short-range denitrification, converting nitrate nitrogen into nitrite nitrogen by short-range denitrification bacteria, and enabling the anaerobic ammonia oxidation bacteria to utilize the nitrite nitrogen and ammonia nitrogen in the inlet water to form good coupling. And then, the step of gradually switching the adding of organic matters is carried out. Under the condition of ensuring that the mass concentration ratio of the organic matters to the total nitrogen is 3:1 after water enters the reactor, the type of the added organic matters is changed from sodium acetate to sodium acetate and fermentation liquor, namely the mass concentration ratio of the sodium acetate to the total nitrogen is 1.5:1, and the mass concentration ratio of short-chain fatty acids to the total nitrogen in the fermentation liquor is also 1.5: 1. The addition of sodium acetate was stopped 16 days after the start of the introduction of the remaining fermentation broth. At the moment, the organic matter is completely provided by the residual sludge fermentation liquor, and the mass concentration ratio of the organic matter to the total nitrogen after water enters the reactor is still maintained to be 3: 1. The residual sludge fermentation liquor is added once per period, and each time is 3-6% of the effective volume of the reactor.
4) Opening a first water inlet peristaltic pump, and pumping the late landfill leachate in the raw water tank into a shortcut nitrification-anaerobic ammonia oxidation integrated reactor, wherein the reactor operates in an anoxic (2 h)/aerobic (38h) mode, namely the following modes: opening the first stirrer after water feeding is finished, entering an anoxic stage, stirring for 2 hours, and closing the first stirrer after the biodegradable organic matters in the raw water are used up; then, a first air compression pump is started to perform aeration, DO is kept below 0.05mg/L through a real-time control device, pH is monitored in real time through a pH control device, and the aeration time is 38 hours; precipitating for 0.5h to separate mud from water, starting a first water outlet peristaltic pump, and discharging water into an intermediate water tank with a water discharge ratio of 50%;
5) opening a second water inlet peristaltic pump, pumping the ammonia nitrogen and nitrate nitrogen wastewater in the intermediate water tank into a short-range denitrification-anaerobic ammonia oxidation integrated reactor, and simultaneously adding residual sludge fermentation mixed liquor, wherein the feed amount of the residual sludge fermentation mixed liquor is 3-6% of the effective volume of the denitrification reactor, and the reactor runs in an anaerobic stirring mode, namely the following mode: and (3) opening a second stirrer to start stirring for 15h after water inflow is finished, simultaneously pumping the residual sludge fermentation mixed liquid, separating mud and water after the reaction is finished and precipitating for 0.5h, opening a second water outlet peristaltic pump, and pumping the supernatant into a water outlet tank, wherein the water discharge ratio is 50%.
The continuous test results show that:
after the process is stably operated, under the condition that the ammonia nitrogen in inlet water is 822.2 +/-14.1 mg/L, the total nitrogen removal rate can reach 97.6 +/-1.5%, the total nitrogen in outlet water is 14.0 +/-2.0 mg/L, the sludge reduction rate is as high as 30.8%, and the process is suitable for deep removal of high ammonia nitrogen wastewater.
Claims (2)
1. Utilize two short distance combination technology to realize device of landfill leachate degree of depth denitrogenation, its characterized in that: comprises a raw water tank (1), a shortcut nitrification-anaerobic ammonia oxidation integrated reactor (2), a degassing water tank (3), a residual sludge alkaline fermentation tank (4), a fermentation liquor storage tank (5), a shortcut denitrification-anaerobic ammonia oxidation integrated reactor (6) and an effluent water tank (7);
the raw water tank is provided with an overflow pipe (1.1) and a water outlet (1.2); the short-cut nitrification-anaerobic ammonia oxidation integrated reactor (2) is provided with a first water inlet peristaltic pump (2.1), a first water inlet (2.2), an air compressor (2.3), a biological membrane carrier filler (2.4), a heating rod (2.5), a first stirrer (2.6), a pH/DO real-time monitoring device (2.7), an aeration sand head (2.8), a first water discharge port (2.9) and a first water outlet peristaltic pump (2.10); the residual sludge alkaline fermentation tank (4) is completely sealed and is externally attached with a heat insulation layer, and is provided with a temperature control device, a magnetic stirrer (4.1), a pH real-time monitoring device (4.2), a first sludge inlet (4.3), a dosing port (4.4) and a first sludge discharge peristaltic pump (4.5); the short-range denitrification-anaerobic ammonia oxidation reactor (6) is provided with a second water inlet peristaltic pump (6.1), a second water inlet (6.2), a heating rod (6.3), a second stirrer (6.4), a pH/DO real-time monitoring device (6.5), a biofilm carrier filler (6.6), a second water outlet (6.7) and a second water outlet peristaltic pump (6.8);
the raw water tank (1) is connected with a first water inlet (2.2) of the shortcut nitrification-anaerobic ammonia oxidation integrated reactor through a first water inlet peristaltic pump (2.1); a first water outlet (2.9) of the shortcut nitrification-anaerobic ammonia oxidation integrated reactor is connected with a water inlet (3.1) of a degassing water tank through a first water outlet peristaltic pump (2.10), and air is pumped into the shortcut nitrification-anaerobic ammonia oxidation integrated reactor (2) through an air compressor (2.3) and an aeration sand head (2.8); a water outlet (3.3) of the degassing water tank is connected with a short-range denitrification-anaerobic ammonia oxidation integrated reactor (6) through a second water inlet peristaltic pump (6.1); the residual sludge alkaline fermentation tank (4) is connected with a fermentation liquor storage tank (5) through a first sludge discharge peristaltic pump (4.5); the fermentation liquor storage tank (5) is connected with the degassing water tank (3); the water outlet tank (7) is connected with a second water outlet (6.7) of the short-range denitrification-anaerobic ammonia oxidation integrated reactor through a second water outlet peristaltic pump (6.8).
2. A method of using the apparatus of claim 1, comprising the steps of:
1) starting a shortcut nitrification-anaerobic ammonia oxidation integrated reactor: inoculating shortcut nitrification-anaerobic ammonia oxidation activated sludge for treating sludge digestive juice in an urban sewage treatment plant into a reactor, wherein the sludge concentration of mixed liquid is 3000-4000 mg/L; the sludge is continuously run for 30 days in a way of anoxic stirring (10h) for one cycle every day in a water quality adaptation period; then, the operation is carried out in an anoxic (8 h)/aerobic (3 h)/anoxic (8 h)/aerobic (3h) mode, and the dissolved oxygen in the aerobic stage is controlled to be below 0.05 mg/L; when the nitrite accumulation phenomenon does not occur after the aerobic stage is finished, the operation mode is adjusted to be anoxic (2 h)/aerobic (38h), and the dissolved oxygen in the aerobic stage is still controlled to be below 0.05 mg/L; at the moment, the hydraulic retention time is 80 hours, active sludge discharge is not carried out, and the temperature is controlled to be 35.0 +/-1.0 ℃; controlling the mass concentration ratio of ammonia nitrogen to nitrate nitrogen in the effluent at the end of the reactor period to be 1: 1;
2) starting the residual sludge alkaline fermentation tank: heating and stirring the residual sludge alkaline fermentation tank by using a magnetic stirrer, controlling the retention time of sludge to be 7.5 days, controlling the sludge discharge mode to be one row a day, maintaining the temperature at 40.0 +/-1.0 ℃, monitoring the reaction pH on line, and maintaining the reaction pH at 11.0 +/-0.5 so as to perform alkaline fermentation to generate short-chain fatty acids;
3) starting a short-cut denitrification-anaerobic ammonia oxidation integrated reactor: inoculating return sludge in an urban sewage treatment plant into a reactor, wherein the sludge concentration of mixed liquor is 3000-4000 mg/L; firstly, sodium acetate is used as an organic matter to acclimate the short-range denitrification capability of sludge, and the mass concentration ratio of the organic matter to total nitrogen after water enters a reactor is controlled to be 3: 1; then, adding anaerobic ammonium oxidation filler with good activity to couple with short-cut denitrification, converting nitrate nitrogen into nitrite nitrogen by short-cut denitrification bacteria, and forming good coupling by using the nitrite nitrogen and ammonia nitrogen in the inlet water by the anaerobic ammonium oxidation bacteria; then, under the condition that the mass concentration ratio of the organic matters to the total nitrogen after water is fed into the reactor is ensured to be 3:1, the type of the added organic matters is changed from sodium acetate to sodium acetate and fermentation liquor, namely the mass concentration ratio of the sodium acetate to the total nitrogen is 1.5:1, and the mass concentration ratio of short-chain fatty acids to the total nitrogen in the fermentation liquor is also 1.5: 1; stopping adding the sodium acetate 16 days after the residual fermentation liquor is introduced; at the moment, the organic matter is completely provided by the residual sludge fermentation liquor, and the mass concentration ratio of the organic matter to the total nitrogen after water enters the reactor is still maintained to be 3: 1; adding the residual sludge fermentation liquor once per period, wherein each time is 3-6% of the effective volume of the reactor;
4) opening a first water inlet peristaltic pump, and pumping the late landfill leachate in the raw water tank into a shortcut nitrification-anaerobic ammonia oxidation integrated reactor, wherein the reactor operates in an anoxic (2 h)/aerobic (38h) mode, namely the following modes: opening the first stirrer after water feeding is finished, entering an anoxic stage, stirring for 2 hours, and closing the first stirrer after the biodegradable organic matters in the raw water are used up; then, a first air compression pump is started to perform aeration, DO is kept below 0.05mg/L through a real-time control device, pH is monitored in real time through a pH control device, and the aeration time is 38 hours; precipitating for 0.5h to separate mud from water, starting a first water outlet peristaltic pump, and discharging water into an intermediate water tank with a water discharge ratio of 50%;
5) opening a second water inlet peristaltic pump, pumping the ammonia nitrogen and nitrate nitrogen wastewater in the intermediate water tank into a short-range denitrification-anaerobic ammonia oxidation integrated reactor, and simultaneously adding residual sludge fermentation mixed liquor, wherein the feed amount of the residual sludge fermentation mixed liquor is 3-6% of the effective volume of the denitrification reactor, and the reactor runs in an anaerobic stirring mode, namely the following mode: and (3) opening a second stirrer to start stirring for 15h after water inflow is finished, simultaneously pumping the residual sludge fermentation mixed liquid, separating mud and water after the reaction is finished and precipitating for 0.5h, opening a second water outlet peristaltic pump, and pumping the supernatant into a water outlet tank, wherein the water discharge ratio is 50%.
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