CN109574218B - Device and method for treating late landfill leachate through shortcut nitrification-fermentation/denitrification-anaerobic ammonia oxidation process - Google Patents
Device and method for treating late landfill leachate through shortcut nitrification-fermentation/denitrification-anaerobic ammonia oxidation process Download PDFInfo
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Abstract
A device and a method for treating late landfill leachate by a shortcut nitrification-fermentation/denitrification-anaerobic ammonia oxidation process belong to the field of biological treatment of high ammonia nitrogen sewage and sludge. The late landfill leachate firstly enters a short-cut nitrification reactor to convert all the ammonia nitrogen in the inflow water into nitrite nitrogen; 92.6 percent of short-cut nitrification effluent and excess sludge enter a fermentation coupling denitrification reactor together to realize synchronous denitrification and excess sludge digestion; the effluent is then mixed with the residual 7.4 percent of short-cut nitrification effluent to enter an anaerobic ammonia oxidation reactor, so that ammonia nitrogen released in the fermentation process and nitrite nitrogen generated by short-cut nitrification are further removed. The invention realizes the deep denitrification of the low C/N ratio late landfill leachate and simultaneously completes the reduction of the excess sludge.
Description
Technical Field
The invention relates to a technology for treating late landfill leachate by a shortcut nitrification-fermentation/denitrification-anaerobic ammonia oxidation process, belonging to the field of biological treatment of high ammonia nitrogen sewage and sludge.
Background
In recent years, with the increasing production of municipal solid waste, landfill has become the most widely used treatment and disposal method in the world. The leachate generated by landfill has the water quality characteristics of complex components, large water quality and water quantity change, high concentration of organic matters and ammonia nitrogen, imbalance proportion of microorganism nutrient elements and the like, so that the treatment of the leachate becomes one of the unsolved problems in the international range. NH is treated by the traditional biological denitrification process4 +Conversion of-N to N03 -N, and denitrifying N03 -N is converted to nitrogen which escapes from the water. The denitrification stage is shown as N03 -and-N is an electron acceptor, and the organic matter is used as an electron donor to convert ammonia nitrogen into nitrogen to complete biological denitrification. The serious shortage of organic carbon sources is a barrier that the denitrification efficiency of the leachate at the late stage cannot be improved, so that the traditional biological denitrification efficiency can only reach about 10 percent, and the additional organic carbon sources can greatly increase the cost of sewage denitrification.
The residual sludge is a byproduct in the biological sewage treatment process and contains a large amount of organic matters, and volatile short-chain fatty acid generated after anaerobic fermentation can be used as a high-quality carbon source in the biological denitrification process. The carbon source in the excess sludge is developed and utilized, so that two problems of insufficient carbon source and excess sludge reduction in a sewage treatment plant can be solved simultaneously. However, a large amount of ammonia nitrogen is released in the fermentation process of the residual sludge, and if the sludge digestion solution is returned to a sewage treatment plant without being treated, the nitrogen load and the operation energy consumption of sewage treatment can be greatly increased. Therefore, there is a need to provide a more efficient denitrification apparatus and method.
The advanced landfill leachate with high ammonia nitrogen concentration is subjected to stable nitrite nitrogen accumulation through the short-cut nitrification process, residual sludge is digested in a fermentation denitrification reactor, a generated organic carbon source is used as an electron donor in the denitrification process, and most of nitrite nitrogen generated by short-cut nitrification is reduced into nitrogen. The ammonia nitrogen released in the sludge digestion process and the residual short-cut nitrified effluent are further removed through anaerobic ammoxidation. As a biological denitrification process without external carbon source addition, compared with the traditional biological denitrification process, the biological denitrification process not only saves 25 percent of aeration quantity and 100 percent of carbon source, but also can complete the reduction effect of residual sludge.
Disclosure of Invention
The invention provides a method for treating late landfill leachate by a shortcut nitrification-fermentation/denitrification-anaerobic ammonia oxidation process, which is characterized in that the late landfill leachate firstly enters a shortcut nitrification reactor to convert all ammonia nitrogen in the inlet water into nitrite nitrogen; 92.6 percent of short-cut nitrification effluent and excess sludge enter a fermentation coupling denitrification reactor together to realize synchronous denitrification and excess sludge digestion; the effluent is then mixed with the residual 7.4 percent of short-cut nitrification effluent to enter an anaerobic ammonia oxidation reactor, so that ammonia nitrogen released in the fermentation process and nitrite nitrogen generated by short-cut nitrification are further removed.
The purpose of the invention is realized by the following technical scheme:
the device for treating the late landfill leachate by the shortcut nitrification-fermentation/denitrification-anaerobic ammonia oxidation process is characterized by comprising a raw water tank (1), a shortcut nitrification reactor (2), a first intermediate water tank (3), a residual sludge storage tank (4), a fermentation coupling denitrification reactor (5), a second intermediate water tank (6) and an anaerobic ammonia oxidation reactor (7); the raw water tank is provided with an overflow pipe and a water outlet; the short-cut nitrification reactor (2) is provided with an air compressor (2.1), a gas flow meter (2.2), an aeration sand head (2.3), a first water inlet (2.5), a first sampling port (2.9), a first water discharge port (2.10), a first stirrer (2.7), a first water inlet peristaltic pump (2.4), a pH/DO real-time monitoring device (2.8) and an ORP real-time monitoring device (2.6); the fermentation coupling denitrification reactor (5) is provided with a second water inlet (5.2), a first sludge inlet (5.3), a second water outlet (5.6), a second water inlet peristaltic pump (5.1), a second stirrer (5.4) and a pH real-time monitoring device (5.5); the anaerobic ammonia oxidation reactor is provided with a third water inlet (7.2), a third water inlet peristaltic pump (7.1), a first return port (7.7), a first return peristaltic pump (7.9), a second return port (7.10), a three-phase separator (7.4), an exhaust port (7.5), an air bag (7.3) and a third water outlet (7.6);
the raw water tank (1) is connected with a first water inlet (2.5) of the short-cut nitrification reactor through a first water inlet peristaltic pump (2.4); a first water outlet (2.10) of the short-cut nitrification reactor is respectively connected with a water inlet (3.1) of a first intermediate water tank and a water inlet (6.2) of a second intermediate water tank, and air is finally pumped into the short-cut nitrification reactor (2) through an aeration sand head (2.3) by an air compressor (2.1) and a gas flowmeter (2.2); a water outlet (3.3) of the first intermediate water tank is connected with a second water inlet (5.2) of the fermentation coupling denitrification reactor through a second water inlet peristaltic pump (5.1); the sludge storage tank (4) is connected with a fermentation coupling denitrification first sludge inlet (5.3); a second water outlet (5.6) of the fermentation coupling denitrification reactor is connected with a second intermediate water tank (6); a water outlet (6.4) of the second intermediate water tank is connected with a third water inlet (7.2) of the anaerobic ammonia oxidation reactor through a third water inlet peristaltic pump (7.1); the first reflux opening (7.7) of the anaerobic ammonia oxidation reactor is connected with the second reflux opening (7.10) through a first reflux peristaltic pump (7.9).
The method for treating the advanced landfill leachate by using the device to carry out the short-cut nitrification-fermentation/denitrification-anaerobic ammonia oxidation process is characterized by comprising the following steps of:
1) the shortcut nitrification sludge, the fermentation coupling denitrification sludge and the anaerobic ammonia oxidation sludge are respectively added into a shortcut nitrification reactor, a fermentation coupling denitrification reactor and an anaerobic ammonia oxidation reactor, and the sludge concentration of the mixed liquor of each reactor after the addition is controlled to be 4125-5079mg/L, 8797-16522mg/L and 5633-6210 mg/L.
2) Pumping the late landfill leachate in a raw water tank into a short-cut nitrification reactor, opening a first stirrer and an air compressor, controlling the dissolved oxygen concentration of the short-cut nitrification reactor to be 0.2-0.5mg/L, consuming alkalinity in the short-cut nitrification process, lowering the pH to the lowest value after the reaction is finished, namely the ammonia valley point, strictly controlling the aeration time through a pH/DO real-time monitoring device, stopping aeration when the ammonia valley point appears in a pH curve, closing the first stirrer and the air compressor, precipitating for 30min, and then discharging the effluent into a first intermediate water tank and a second intermediate water tank respectively according to the volume ratio of 25: 2.
3) And opening a second water inlet peristaltic pump to pump nitrite wastewater in the first intermediate water tank into a fermentation coupling denitrification reactor, simultaneously adding sludge in a sludge storage tank into the fermentation coupling denitrification reactor, wherein the denitrification process is a process for generating alkalinity, the pH continuously rises along with the reaction, after the denitrification is finished, an inflection point, namely 'nitrite elbow', appears on a pH curve, a second stirrer is opened, the anoxic stirring time is strictly controlled by an aeration time through a pH/DO real-time monitoring device, the stirring is stopped when the pH curve has 'nitrite elbow', the second stirrer is closed, and supernatant is discharged into the second intermediate water tank after 90min of sedimentation.
4) And opening a third water inlet peristaltic pump to pump nitrite nitrogen/ammonia nitrogen wastewater with the concentration ratio of 1-1.32 in the second intermediate water tank into the anaerobic ammonia oxidation reactor, controlling the flow rate of the third water inlet peristaltic pump to be 0.15L/h, pumping the wastewater of the anaerobic ammonia oxidation reactor into a second return port from a first return port through a first return peristaltic pump, and controlling the flow rate of the first return peristaltic pump to be 0.45L/h.
Principle of the technology
The device and the method for treating the late landfill leachate by the shortcut nitrification-fermentation/denitrification-anaerobic ammonia oxidation process firstly pump the late landfill leachate into a shortcut nitrification reactor to convert all the ammonia nitrogen in the inlet water into nitrite nitrogen. 92.6 percent of effluent in the short-cut nitrification reactor enters a first intermediate water tank, and the rest 7.4 percent of effluent enters a second intermediate water tank. Nitrite nitrogen wastewater and excess sludge in the first intermediate water tank enter the fermentation coupling denitrification reactor together to realize synchronous denitrification and excess sludge digestion. In order to realize deep denitrification, the effluent of the fermentation coupling denitrification reactor and nitrite nitrogen wastewater in the second intermediate water tank are mixed and enter the anaerobic ammonia oxidation reactor, and the ammonia nitrogen released in the fermentation process and the nitrite nitrogen generated by shortcut nitrification are further removed through anaerobic ammonia oxidation. The invention realizes the deep denitrification of the low C/N ratio late landfill leachate and simultaneously completes the reduction of the excess sludge.
The device and the method for treating the late landfill leachate by the shortcut nitrification-fermentation/denitrification-anaerobic ammonia oxidation process have the following advantages that:
1) by organically combining the fermentation, denitrification and anaerobic ammonia oxidation of the excess sludge, the advanced denitrification of the landfill leachate in the late stage is realized in the real sense, and the purposes of saving the carbon source adding and treating cost are achieved.
2) The short-cut nitrification adopted by the invention takes the inorganic carbon as the carbon source, the ammonia oxidizing bacteria convert the ammonia nitrogen into nitrite nitrogen, the aeration quantity is saved by 25 percent compared with the traditional full-process nitrification, and no N exists in the metabolic process2O is generated, so the greenhouse gas emission of the process is low.
3) The aeration time is controlled in real time through the pH curve to convert all the ammonia nitrogen in the inlet water into nitrite nitrogen, and the real-time control strategy can strictly control the nitrification in the short-cut nitrification stage and avoid NOB increase and energy waste caused by over-aeration.
4) The reaction time of the short-cut nitrification and the fermentation coupling denitrification is controlled in real time by adopting a pH curve, and when the water quality of the landfill leachate in the late stage of water inlet fluctuates, the system can still stably operate, so that the nitrogen in the system can be efficiently removed.
5) The organic carbon source generated in the fermentation process of the excess sludge can be used as an electron donor to reduce nitrite nitrogen generated in the short-cut nitrification process into nitrogen. The digestion of the excess sludge is completed while 100% of carbon source is saved.
6) Ammonia nitrogen released in the fermentation process of the excess sludge is further removed through anaerobic ammonia oxidation, and advanced denitrification treatment of the landfill leachate at the late stage is realized.
Drawings
FIG. 1 is a diagram of the apparatus of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, the device for treating advanced landfill leachate by a shortcut nitrification-fermentation/denitrification-anaerobic ammonium oxidation process is characterized by comprising a raw water tank (1), a shortcut nitrification reactor (2), a first intermediate water tank (3), a residual sludge storage tank (4), a fermentation coupling denitrification reactor (5), a second intermediate water tank (6) and an anaerobic ammonium oxidation reactor (7);
the raw water tank is provided with an overflow pipe and a water outlet; the short-cut nitrification reactor (2) is provided with an air compressor (2.1), a gas flow meter (2.2), an aeration sand head (2.3), a first water inlet (2.5), a first sampling port (2.9), a first water discharge port (2.10), a first stirrer (2.7), a first water inlet peristaltic pump (2.4), a pH/DO real-time monitoring device (2.8) and an ORP real-time monitoring device (2.6); the fermentation coupling denitrification reactor (5) is provided with a second water inlet (5.2), a first sludge inlet (5.3), a second water outlet (5.6), a second water inlet peristaltic pump (5.1), a second stirrer (5.4) and a pH real-time monitoring device (5.5); the anaerobic ammonia oxidation reactor is provided with a third water inlet (7.2), a third water inlet peristaltic pump (7.1), a first return port (7.7), a first return peristaltic pump (7.9), a second return port (7.10), a three-phase separator (7.4), an exhaust port (7.5), an air bag (7.3) and a third water outlet (7.6);
the raw water tank (1) is connected with a first water inlet (2.5) of the short-cut nitrification reactor through a first water inlet peristaltic pump (2.4); a first water outlet (2.10) of the short-cut nitrification reactor is respectively connected with a water inlet (3.1) of a first intermediate water tank and a water inlet (6.2) of a second intermediate water tank, and air is finally pumped into the short-cut nitrification reactor (2) through an aeration sand head (2.3) by an air compressor (2.1) and a gas flowmeter (2.2); a water outlet (3.3) of the first intermediate water tank is connected with a second water inlet (5.2) of the fermentation coupling denitrification reactor through a second water inlet peristaltic pump (5.1); the sludge storage tank (4) is connected with a fermentation coupling denitrification first sludge inlet (5.3); a second water outlet (5.6) of the fermentation coupling denitrification reactor is connected with a second intermediate water tank (6); a water outlet (6.4) of the second intermediate water tank is connected with a third water inlet (7.2) of the anaerobic ammonia oxidation reactor through a third water inlet peristaltic pump (7.1); the first reflux opening (7.7) of the anaerobic ammonia oxidation reactor is connected with the second reflux opening (7.10) through a first reflux peristaltic pump (7.9).
In this embodiment, the water used for the experiment is actual landfill leachate at late stage, and the average ammonia nitrogen concentration is 1736 + -40 mg/L, the average COD concentration is 2109 + -200 mg/L, and the average alkalinity is 4000 + -1000 mg/L (using CaCO)3Meter). The experimental short-cut nitrification reactor adopts sequencing batch SBR, the effective volume is 10L, and the water drainage ratio is 50%; the fermentation coupling denitrification reactor adopts sequencing batch SBR with the effective volume of 6L and the sludge volume adding ratio of 16.7-41.7%; the anaerobic ammonia oxidation reactor adopts an upflow anaerobic sludge blanket reactor (UASB) with the effective volume of 2L;
the specific operation process is as follows:
1) the shortcut nitrification sludge, the fermentation coupling denitrification sludge and the anaerobic ammonia oxidation sludge are respectively added into a shortcut nitrification reactor, a fermentation coupling denitrification reactor and an anaerobic ammonia oxidation reactor, and the sludge concentration of the mixed liquor of each reactor after the addition is controlled to be 4125-5079mg/L, 8797-16522mg/L and 5633-6210 mg/L.
2) Pumping the late landfill leachate in a raw water tank into a short-cut nitrification reactor, opening a first stirrer and an air compressor, controlling the dissolved oxygen concentration of the short-cut nitrification reactor to be 0.2-0.5mg/L, consuming alkalinity in the short-cut nitrification process, lowering the pH to the lowest value after the reaction is finished, namely the ammonia valley point, strictly controlling the aeration time through a pH/DO real-time monitoring device, stopping aeration when the ammonia valley point appears in a pH curve, closing the first stirrer and the air compressor, precipitating for 30min, and then discharging the effluent into a first intermediate water tank and a second intermediate water tank respectively according to the volume ratio of 25: 2.
3) And opening a second water inlet peristaltic pump to pump nitrite wastewater in the first intermediate water tank into a fermentation coupling denitrification reactor, simultaneously adding sludge in a sludge storage tank into the fermentation coupling denitrification reactor, wherein the denitrification process is a process for generating alkalinity, the pH continuously rises along with the reaction, after the denitrification is finished, an inflection point, namely 'nitrite elbow', appears on a pH curve, a second stirrer is opened, the anoxic stirring time is strictly controlled by an aeration time through a pH/DO real-time monitoring device, the stirring is stopped when the pH curve has 'nitrite elbow', the second stirrer is closed, and supernatant is discharged into the second intermediate water tank after 90min of sedimentation.
4) And opening a third water inlet peristaltic pump to pump nitrite nitrogen/ammonia nitrogen wastewater with the concentration ratio of 1-1.32 in the second intermediate water tank into the anaerobic ammonia oxidation reactor, controlling the flow rate of the third water inlet peristaltic pump to be 0.15L/h, pumping the wastewater of the anaerobic ammonia oxidation reactor into a second return port from a first return port through a first return peristaltic pump, and controlling the flow rate of the first return peristaltic pump to be 0.45L/h.
The continuous test results show that:
under the conditions that the concentrations of ammonia nitrogen, total nitrogen and COD in inlet water are 1736 +/-40 mg/L, 2023 +/-75 mg/L and 2109 +/-200 mg/L respectively, the total nitrogen removal rate and the total nitrogen removal rate of the shortcut nitrification-fermentation/denitrification-anaerobic ammonia oxidation process can reach 98.7 percent and 0.52kg/m3d. The reduction of excess sludge exceeding 62.5 percent is completed in the system, the average cell attenuation rate is 0.274/d, and the average sludge digestion rate is as high as 5.96kg/m3d。
Claims (1)
1. The method for treating the late landfill leachate by utilizing the shortcut nitrification-fermentation/denitrification-anaerobic ammonia oxidation process comprises the steps that a device used in the method comprises a raw water tank (1), a shortcut nitrification reactor (2), a first intermediate water tank (3), a residual sludge storage tank (4), a fermentation coupling denitrification reactor (5), a second intermediate water tank (6) and an anaerobic ammonia oxidation reactor (7);
the raw water tank is provided with an overflow pipe (1.1) and a water outlet (1.2); the short-cut nitrification reactor (2) is provided with an air compressor (2.1), a gas flow meter (2.2), an aeration sand head (2.3), a first water inlet (2.5), a first sampling port (2.9), a first water discharge port (2.10), a first stirrer (2.7), a first water inlet peristaltic pump (2.4), a pH/DO real-time monitoring device (2.8) and an ORP real-time monitoring device (2.6); the first intermediate water tank is provided with a water inlet (3.1), an overflow pipe (3.2) and a water outlet (3.3); the fermentation coupling denitrification reactor (5) is provided with a second water inlet (5.2), a first sludge inlet (5.3), a second water outlet (5.6), a second water inlet peristaltic pump (5.1), a second stirrer (5.4) and a pH real-time monitoring device (5.5); the second intermediate water tank is provided with a No. 1 water inlet (6.1), a water inlet (6.2), an overflow pipe (6.3) and a water outlet (6.4); the anaerobic ammonia oxidation reactor is provided with a third water inlet (7.2), a third water inlet peristaltic pump (7.1), a first return port (7.7), a first return peristaltic pump (7.9), a second return port (7.10), a three-phase separator (7.4), an exhaust port (7.5), an air bag (7.3) and a third water outlet (7.6); the raw water tank (1) is connected with a first water inlet (2.5) of the short-cut nitrification reactor through a first water inlet peristaltic pump (2.4); a first water discharge port (2.10) of the short-cut nitrification reactor is respectively connected with a water inlet (3.1) of a first intermediate water tank and a water inlet (6.2) of a second intermediate water tank, and air is finally pumped into the short-cut nitrification reactor (2) through an aeration sand head (2.3) through an air compressor (2.1) and a gas flow meter (2.2); a water outlet (3.3) of the first intermediate water tank is connected with a second water inlet (5.2) of the fermentation coupling denitrification reactor through a second water inlet peristaltic pump (5.1); the residual sludge storage tank (4) is connected with a first sludge inlet (5.3) of the fermentation coupling denitrification reactor; a second water outlet (5.6) of the fermentation coupling denitrification reactor is connected with a second intermediate water tank (6); a water outlet (6.4) of the second intermediate water tank is connected with a third water inlet (7.2) of the anaerobic ammonia oxidation reactor through a third water inlet peristaltic pump (7.1); the first reflux opening (7.7) of the anaerobic ammonia oxidation reactor is connected with the second reflux opening (7.10) through a first reflux peristaltic pump (7.9),
the method is characterized by comprising the following steps:
1) respectively adding the shortcut nitrification sludge, the fermentation coupling denitrification sludge and the anaerobic ammonia oxidation sludge into a shortcut nitrification reactor, a fermentation coupling denitrification reactor and an anaerobic ammonia oxidation reactor, and controlling the sludge concentration of mixed liquor of each reactor after the addition to be 4125-5079mg/L, 8797-16522mg/L and 5633-6210 mg/L;
2) pumping the late landfill leachate in a raw water tank into a short-cut nitrification reactor, opening a first stirrer and an air compressor, controlling the dissolved oxygen concentration of the short-cut nitrification reactor to be 0.2-0.5mg/L, consuming alkalinity in the short-cut nitrification process, lowering the pH to the lowest value after the reaction is finished, namely the ammonia valley point, strictly controlling the aeration time through a pH/DO real-time monitoring device, stopping aeration when the ammonia valley point appears in a pH curve, closing the first stirrer and the air compressor, precipitating for 30min, and then respectively discharging the effluent into a first intermediate water tank and a second intermediate water tank according to the volume ratio of 25: 2;
3) opening a second water inlet peristaltic pump to pump nitrite wastewater in a first intermediate water tank into a fermentation coupling denitrification reactor, and simultaneously adding sludge in a residual sludge storage tank into the fermentation coupling denitrification reactor, wherein the denitrification process is a process for generating alkalinity, the pH value continuously rises along with the reaction, after the denitrification is finished, an obvious inflection point, namely nitrite elbow, appears on a pH curve, a second stirrer is opened, the anoxic stirring time is strictly controlled by pH real-time monitoring equipment, the stirring is stopped when the nitrite elbow appears on the pH curve, the second stirrer is closed, and supernatant is discharged into a second intermediate water tank after 90min of sedimentation;
4) and opening a third water inlet peristaltic pump to pump nitrite nitrogen/ammonia nitrogen wastewater with the concentration ratio of 1-1.32 in the second intermediate water tank into the anaerobic ammonia oxidation reactor, controlling the flow rate of the third water inlet peristaltic pump to be 0.15L/h, pumping the wastewater of the anaerobic ammonia oxidation reactor into a second return port from a first return port through a first return peristaltic pump, and controlling the flow rate of the first return peristaltic pump to be 0.45L/h.
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| CN110002677B (en) * | 2019-04-19 | 2021-07-30 | 北京工业大学 | Advanced treatment method for municipal sewage treatment plant after anaerobic digestion of excess sludge |
| CN112250178B (en) * | 2020-09-24 | 2022-04-22 | 北京工业大学 | Method and device for realizing advanced denitrification and sludge reduction of late landfill leachate by using sludge fermentation carbon source |
| CN112390358B (en) * | 2020-11-09 | 2021-08-06 | 北京工业大学 | Device and method for enhancing domestic sewage denitrification by coupling anaerobic methanogenesis and shortcut nitrification anaerobic ammonia oxidation |
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| CN113003722A (en) * | 2021-02-09 | 2021-06-22 | 北京工业大学 | Device and method for synchronously treating landfill leachate and excess sludge through three-stage type shortcut nitrification-anaerobic ammonia oxidation process |
| CN113003725A (en) * | 2021-02-20 | 2021-06-22 | 北京工业大学 | Device and method for promoting quality improvement and efficiency improvement of sewage plant based on DEAMOX and sludge fermentation coupling technology |
| CN114291962B (en) * | 2021-11-26 | 2023-04-18 | 北京工业大学 | Device and method for treating late landfill leachate by three-stage plug flow type PN-PNA-DE process |
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| CN103663879A (en) * | 2013-12-24 | 2014-03-26 | 北京工业大学 | Device and method for synchronously treating high-ammonia-nitrogen wastewater through sludge fermentation |
| CN106007168A (en) * | 2016-05-15 | 2016-10-12 | 北京工业大学 | Method for combining domestic sewage deep denitrification with synchronous sludge fermentation mixing liquid recycling through multi-stage SBRs |
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