CN103288211A - Device and method for treating low-C/N (carbon/nitrogen) ratio urban sewage by an anoxic/aerobic SBR-DEAMOX (denitrifying ammonium oxidation) denitrification process - Google Patents
Device and method for treating low-C/N (carbon/nitrogen) ratio urban sewage by an anoxic/aerobic SBR-DEAMOX (denitrifying ammonium oxidation) denitrification process Download PDFInfo
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Abstract
The invention provides a device and method for treating low-C/N (carbon/nitrogen) ratio urban sewage by an anoxic/aerobic SBR-DEAMOX (denitrifying ammonium oxidation) denitrification process. One part of the urban sewage firstly enters an anoxic/aerobic SBR reactor and is subjected to pre-denitrifying and nitrifying reaction; and the produced nitrifying liquid is mixed with the other part of raw sewage, and the mixture enters a partial DEAMOX reactor for denitrification. The method comprises the following steps that: 65-85% of the raw water enters the anoxic/aerobic SBR reactor; the pre-denitrifying process is performed by use of the carbon source in the raw water to reduce the residual NO3<->-N of the system in the previous cycle; the NH4<+>-N is oxidized into NO3<->-N by aeration; the nitrifying liquid and 15-35% of the raw water together enter the DEAMOX reactor; and by taking the NO2<->-N produced by partial denitrifying as an electron acceptor, the NH4<+>-N in the raw water generates N2 through anaerobic ammonium oxidation reaction to realize deep denitrification of low-C/N ratio urban sewage. The technology makes full use of the carbon source in the raw water, does not need an external carbon source, saves energy consumption of aeration, and is an economical and efficient new means for solving the problem in the denitrification of low-C/N ratio urban sewage.
Description
Technical field
The present invention relates to a kind of less energy-consumption and handle low-carbon and nitrogen (C/N) than the method for municipal effluent, the technical field that belongs to biological sewage treatment, specifically be to be two portions with former moisture, a part enters anoxic/aerobic sbr reactor device, take full advantage of organism in the former water by Prepositive denitrification, aeration carries out nitrated subsequently, nitrification liquid and another part Yuan Shui re-entering part denitrification coupling Anammox (DEAMOX) reactor, utilize a small amount of organism in the former water to generate nitrite nitrogen by the part denitrification, more synchronously with former water in ammonia nitrogen realize the removal of water nitrogen in the dirt by the Anammox reaction.The present invention takes full advantage of carbon source in the former water, need not to add outer carbon source, reduces the aeration process oxygen-consumption, has reduced the working cost in the sewage treatment process.
Background technology
In recent years, nitrogen, the excessive eutrophication phenomenon that causes of phosphorus are on the rise in the water body, water area ecological environment and human health have been subjected to having a strong impact on, and China is to the effluent quality of municipal sewage plant for this reason, and is especially stricter to nitrogen, the phosphorus index request of water outlet.Bio-denitrification technology is present most widely used sewage water denitrification technology, and principle is to realize the removal of nitrogen by nitrifier and denitrifying bacteria effect, and its key that reaches efficient denitrification is sufficient carbon source.Water inlet C/N then needs to add outer carbon source when relatively low and improves treatment effect, but this working cost that had not only consumed limited organic resource but also increased Sewage Plant.
Municipal effluent for low C/N ratio, adopt tradition aerobic/when anoxic process is handled, organism is consumed at aeration phase in the former water, and follow-up anoxic denitrification process can cause denitrification not thorough owing to carbon source is not enough, limited carbon source and aeration energy consumption in the former water have not only been wasted, and treatment effect is undesirable, can not satisfy strict emission request, and research less energy-consumption, the municipal effluent denitrification process that treatment effect is good have become an important process in the sewage disposal.
Anaerobic ammonia oxidation process is a kind of new bio denitride technology, and principle is that anaerobic ammonium oxidizing bacteria is with NO under anoxia condition
2 --N is electron acceptor(EA), directly with NH
4 +-N is oxidized to N
2Compare with traditional technology, anaerobic ammonia oxidation process need not oxygen supply and organic carbon source, and excess sludge production is low, anaerobic ammonia oxidizing bacteria metabolic activity height, and process volume transformation efficiency height is the bio-denitrifying sewage approach of present economical and efficient of generally acknowledging.But the Anammox reaction is matrix with the nitrite, usually need be with short distance nitration as pre-treating technology.The realization of short distance nitration mainly makes nitration reaction only proceed to NO by methods such as restriction dissolved oxygen, free ammonia inhibition and hot operations
2 -This step of-N, but in handling the low practical application of C/N than municipal effluent, be restricted, be difficult to keep stable and make comparatively reason such as difficulty and being not suitable for economically of sewage warming temperature mainly due to nitrite accumulation.
If can under the lower situation of the C/N that disposes of sewage, realize denitrification effect preferably, reduce the working cost for the treatment of processes simultaneously, can reach municipal sewage treatment less energy-consumption, high efficiency target.
Summary of the invention
The objective of the invention is in order to solve the problems of the technologies described above, propose a kind of the processing by anoxic/aerobic SBR-DEAMOX denitrification process and hang down C/N than the method for (C/N＜4) municipal effluent, specifically be to be two portions with former moisture, a part enters anoxic/aerobic sbr reactor device, utilizes in the former water carbon source to remove on this reactor and remains NO after the one-period draining
3 --N, again by aeration with NH in the former water
4 +-N is oxidized to NO
3 --N, the former water of the nitrification liquid of discharge and another part enter DEAMOX(part denitrification coupling Anammox again) reactor, utilize a small amount of carbon source in the former water with NO in the nitrification liquid
3 --N is reduced to NO
2 --N, NO
2 --N and NH
4 +-N generates N by the Anammox reaction
2Thereby, reach low C/N than the purpose of city sewage deep denitrogenation.
The objective of the invention is to be achieved through the following technical solutions:
A kind of device for anoxic/aerobic SBR-DEAMOX denitrification process is characterized in that, comprises raw water box 1, anoxic/aerobic sbr reactor device 2, intermediate water tank 3, DEAMOX reactor 4.
Raw water box 1 links to each other with anoxic/aerobic sbr reactor device 3 by first peristaltic pump 2.1; This reactor is provided with whipping appts 2.2 and temperature-control device 2.3, and reactor bottom is provided with aeration head 2.4, and pneumatic pump 2.5 links to each other with aeration head by gas meter 2.6; Anoxic/aerobic sbr reactor device one side is established excess sludge discharge mouth 2.8, and anoxic/aerobic sbr reactor device links to each other with intermediate water tank 3; Raw water box links to each other with intermediate water tank by second peristaltic pump 3.1; Intermediate water tank links to each other with DEAMOX reactor 4 by the 3rd peristaltic pump 4.1; The DEAMOX reactor is provided with whipping appts 4.2 and temperature-control device 4.3.
Anoxic/aerobic SBR-DEAMOX denitrification process is handled low C/N than the method for municipal effluent, it is characterized in that, comprises following process:
DEAMOX reactor inoculation Anammox mud and sludge hydrolytic acidifying coupling denitrification mud are the mixed mud of 2.5～3.8:1 by volume, inoculation back DEAMOX reactor sludge concentration MLSS=1500～2500mg/L.Wherein, sludge hydrolytic acidifying coupling denitrification mud comes the sludge hydrolytic acidifying coupling denitrification reactor of self-operating more than 6 months, this reactor water inlet NO
3 --N=30～60mg/L, NO
3 --N clearance is 90%～100%, and this mud has incomplete denitrification characteristic, under the low situation of organic carbon source concentration, and can only be with NO
3 --N is reduced to NO
2 --N; Anammox mud comes the anaerobic ammonia oxidation reactor of self-operating more than 10 months, its NH of intaking
4 +-N=20～30mg/L, NO
2 --N=28～40mg/L, NH
4 +-N and NO
2 -The clearance of-N is respectively 85%～94% and 90%～99%.
In the raw water box weekly phase 65%～85% sewage of handling total sewage quantity pump into anoxic/aerobic sbr reactor device, controlling its sludge concentration MLSS is 1500～3000mg/L; Anoxic/aerobic sbr reactor device water inlet back anoxia stirring 1～2h; Aeration agitation 2～4h subsequently, dissolved oxygen concentration control is at 2.0～4.0mg/L in the aeration process; Aeration finishes postprecipitation 30～60min, then nitrification liquid is expelled to intermediate water tank, and the draining ratio is 40%～60%.
In the raw water box weekly phase 15%～35% sewage of handling total sewage quantity pump into intermediate water tank, mix with nitrification liquid; Mixed solution in the intermediate water tank pumps into the DEAMOX reactor, and anoxia stirring 2～5h behind the water inlet end precipitates 30～60min then, discharges supernatant liquor, and the draining ratio is 40%～60%.
Know-why:
Anoxic/aerobic SBR-DEAMOX denitrification process is handled low C/N and is referred to that than municipal effluent handling total sewage quantity by phase weekly is divided into two portions, and at first 65%～85% sewage enters anoxic/aerobic sbr reactor device, remaining NO in the system after last one-period finishes
3 --N utilize this part the water inlet in organic carbon source carry out denitrification, pass through aerobic stage again with the NH in the former water
4 +-N is converted into NO
3 --N, the nitrification liquid of discharge mixes with the former water of another part, enters in the DEAMOX reactor; Comprise the flora that a class has incomplete denitrification attribute in the sludge hydrolytic acidifying coupling denitrification mud of DEAMOX reactor inoculation, it can only be with NO under the lower condition of organic concentration
3 --N is reduced to NO
2 --N; The NO that denitrification process produces in the DEAMOX reactor
2 --N more synchronously with former water in NH
4 +-N realizes the removal of nitrogen by the effect of anaerobic ammonia oxidizing bacteria in the seed sludge.
The anoxic that the present invention relates to/aerobic SBR-DEAMOX denitrification process is handled low C/N and is had the following advantages than municipal effluent:
1) at the municipal effluent denitrogenation of low C/N ratio, compare with traditional nitration denitrification technology, need not additional carbon, denitrification process only need take full advantage of that carbon source can satisfy the water outlet requirement in the former water;
2) organism in a part of sewage is consumed because of Prepositive denitrification in the treating processes, and requisite oxygen tolerance reduces in aeration process subsequently, in addition, and the NH in the partial raw water
4 +-N need not oxidation, removes by the Anammox reaction, has therefore saved the required aeration rate of entire reaction course, thereby has greatly reduced the working cost in the sewage treatment process.
3) whole technological operation is simple, only needs to set time and the flooding velocity in each stage in the reaction process, and need not complicated control process, and water outlet TN can satisfy emission standard.
Description of drawings
Fig. 1 is that anoxic/aerobic SBR-DEAMOX denitrification process is handled low C/N than the schema of municipal effluent.
Embodiment
The invention will be further described below in conjunction with accompanying drawing and specific examples:
As shown in Figure 1, the device of anoxic/aerobic SBR-DEAMOX denitrification process comprises raw water box 1, anoxic/aerobic sbr reactor device 2, intermediate water tank 3, DEAMOX reactor 4.
A part of sewage links to each other with anoxic/aerobic sbr reactor device 2 by first peristaltic pump 2.1 in the raw water box 1; This reactor is provided with whipping appts 2.2 and temperature-control device 2.3, and reactor bottom is provided with aeration head 2.4, and pneumatic pump 2.5 links to each other with aeration head by gas meter 2.6; Anoxic/aerobic sbr reactor device one side is established intake 2.7 and excess sludge discharge mouth 2.8, and anoxic/aerobic sbr reactor device links to each other with intermediate water tank 3; Raw water box links to each other with intermediate water tank by second peristaltic pump 3.1; The 3rd peristaltic pump 4.1 links to each other intermediate water tank with DEAMOX reactor 4; The DEAMOX reactor is provided with whipping appts 4.2, temperature-control device 4.3 and intake 4.4.
Specifically comprise following process:
DEAMOX reactor inoculation Anammox mud and sludge hydrolytic acidifying coupling denitrification mud are the mixed mud of 3:1 by volume, inoculation back DEAMOX reactor sludge concentration MLSS=1500～2500mg/L.Wherein, sludge hydrolytic acidifying coupling denitrification mud comes the sludge hydrolytic acidifying coupling denitrification reactor of self-operating more than 6 months, this reactor water inlet NO
3 --N=30～60mg/L, NO
3 --N clearance is 90%～100%, and this mud has incomplete denitrification characteristic, under the low situation of organic carbon source concentration, and can only be with NO
3 --N is reduced to NO
2 --N; Anammox mud comes the anaerobic ammonia oxidation reactor of self-operating more than 10 months, its NH of intaking
4 +-N=20～30mg/L, NO
2 --N=28～40mg/L, NH
4 +-N and NO
2 -The clearance of-N is respectively 85%～94% and 90%～99%.
Test used former hydromining family members institute of Beijing University of Technology sanitary sewage, significant parameter is: COD=200～300mg/L, NH
4 +-N=60～85mg/L, TN=60～90mg/L; Its C/N belongs to typical low C/N and compares municipal effluent than between 2.2～3.5; Former water is collected in the raw water box; To handle total sewage quantity be 7.5L to anoxic/aerobic SBR-DEAMOX denitrification process phase weekly.
Anoxic/aerobic sbr reactor device useful volume is 12L, and temperature is controlled at 25～28 ℃, and sludge age SRT is controlled to be 5 days.The sewage of at first total sewage quantity 80% pumps into anoxic/aerobic sbr reactor device, and the water inlet volume is 6L; Water inlet back anoxia stirring 1h; Aeration agitation 3h subsequently, dissolved oxygen concentration 2.0～4.0mg/L in the Controlling System; Aeration finishes postprecipitation 30min, then nitrification liquid is expelled to intermediate water tank, and the draining ratio is 50%, NH in the nitrification liquid
4 +-N=5～10mg/L, NO
3 --N=30～40mg/L;
In the raw water box weekly the phase sewage of handling total sewage quantity 20% enter intermediate water tank by peristaltic pump, water inlet volume 2L mixes mixed solution COD=60～80mg/L, NH with nitrification liquid
4 +-N=18～26mg/L, NO
3 --N=24～32mg/L;
Mixed solution in the 7.5L intermediate water tank is pumped into the DEAMOX reactor, DEAMOX reactor useful volume 15L, temperature is controlled at 28～30 ℃, and SRT is 30 days, water inlet back anoxia stirring 3h; Precipitation 40min; Afterwards supernatant liquor is discharged, the draining ratio is 50%, and the phase volume of displacement is 7.5L weekly, water outlet NH
4 +-N＜2mg/L, TN＜5mg/L, the TN clearance reaches 88%～90%.
Long run test result shows:
Be water inlet with real life sewage, anoxic/aerobic sbr reactor device sludge concentration MLSS is controlled to be 2000～2500mg/L, and SRT is 5 days, anoxia stirring 1h, and aeration agitation 3h, the draining ratio is 50%; DEAMOX reactor sludge concentration MLSS is controlled to be 1500～2500mg/L simultaneously, and SRT is 30 days, and the draining ratio is 50%; Total system is when the phase is disposed of sewage 7.5L weekly, water outlet NH
4 +-N＜2mg/L, TN＜5mg/L, the TN clearance reaches 91%～95%, can realize the city sewage deep denitrogenation.
Claims (2)
1. a device that is used for anoxic/aerobic SBR-DEAMOX denitrification process is characterized in that, comprises raw water box (1), anoxic/aerobic sbr reactor device (2), intermediate water tank (3), DEAMOX reactor (4);
Raw water box (1) links to each other with anoxic/aerobic sbr reactor device (3) by first peristaltic pump (2.1); This reactor is provided with whipping appts (2.2) and temperature-control device (2.3), and reactor bottom is provided with aeration head (2.4), and pneumatic pump (2.5) links to each other with aeration head by gas meter (2.6); Anoxic/aerobic sbr reactor device one side is established excess sludge discharge mouth (2.8); Anoxic/aerobic sbr reactor device links to each other with intermediate water tank (3); Raw water box links to each other with intermediate water tank by second peristaltic pump (3.1); Intermediate water tank links to each other with DEAMOX reactor (4) by the 3rd peristaltic pump (4.1); The DEAMOX reactor is provided with whipping appts (4.2) and temperature-control device (4.3).
2. application rights requires 1 described device to carry out anoxic/aerobic SBR-DEAMOX denitrification process and handles low C/N than the method for municipal effluent, it is characterized in that, comprises following process:
DEAMOX reactor inoculation Anammox mud and sludge hydrolytic acidifying coupling denitrification mud are the mixed mud of 2.5～3.8:1 by volume, inoculation back DEAMOX reactor sludge concentration MLSS=1500～2500mg/L; Wherein, sludge hydrolytic acidifying coupling denitrification mud comes the sludge hydrolytic acidifying coupling denitrification reactor of self-operating more than 6 months, this reactor water inlet NO
3 --N=30～60mg/L, NO
3 --N clearance is 90%～100%; Anammox mud comes the anaerobic ammonia oxidation reactor of self-operating more than 10 months, its NH of intaking
4 +-N=20～30mg/L, NO
2 --N=28～40mg/L, NH
4 +-N and NO
2 -The clearance of-N is respectively 85%～94% and 90%～99%;
In the raw water box weekly phase 65%～85% sewage of handling total sewage quantity pump into anoxic/aerobic sbr reactor device, control reactor sludge concentration MLSS is 1500～3000mg/L; Anoxic/aerobic sbr reactor device water inlet back anoxia stirring 1～2h; Aeration agitation 2～4h subsequently, dissolved oxygen concentration control is at 2.0～4.0mg/L in the aeration process; Aeration finishes postprecipitation 30～60min, then nitrification liquid is expelled to intermediate water tank, and the draining ratio is 40%～60%;
In the raw water box weekly phase 15%～35% sewage of handling total sewage quantity pump into intermediate water tank, mix with nitrification liquid; Mixed solution in the intermediate water tank pumps into the DEAMOX reactor; DEAMOX reactor water inlet back anoxia stirring 2～5h; Precipitate 30～60min then, discharge supernatant liquor, the draining ratio is 40%～60%.
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