CN103288211B - 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 process low-carbon and nitrogen (C/N) than the method for municipal effluent, the technical field that belongs to biological sewage treatment, by former moisture, be specifically two portions, a part enters anoxic/aerobic sbr reactor device, by Prepositive denitrification, make full use of organism in former water, 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 former water to generate nitrite nitrogen by part denitrification, synchronously by Anammox, react with the ammonia nitrogen in former water the removal that realizes water nitrogen in dirt again.The present invention makes full use of carbon source in former water, without adding outer carbon source, reduces aeration process oxygen-consumption, has reduced the working cost in sewage treatment process.
Background technology
In recent years, Water, the excessive eutrophication phenomenon causing of phosphorus are on the rise, water area ecological environment and human health have been subject to having a strong impact on, and the effluent quality of China to municipal sewage plant is for this reason especially stricter to the nitrogen of water outlet, phosphorus index request.Bio-denitrification technology is current most widely used sewage water denitrification technology, and principle is for realizing 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 needs to add outer carbon source when lower 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/anoxic process is when process, in former water, organism is consumed at aeration phase, and follow-up anoxic denitrification process can cause denitrification not thorough because carbon source is not enough, limited carbon source and aeration energy consumption in former water have not only been wasted, and treatment effect is undesirable, can not meet strict emission request, research less energy-consumption, the municipal effluent denitrification process that treatment effect is good have become an important process in 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 by NH
4 +-N is oxidized to N
2.Compare with traditional technology, anaerobic ammonia oxidation process is without oxygen supply and organic carbon source, and excess sludge production is low, and anaerobic ammonia oxidizing bacteria metabolic activity is high, and process volume transformation efficiency is high, is the bio-denitrifying sewage approach of current generally acknowledged economical and efficient.But Anammox reaction be take nitrite as matrix, conventionally need to using 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 be restricted in than the practical application of municipal effluent processing low C/N, is difficult to remain stable and makes the comparatively reason such as difficulty and being not suitable for economically of sewage warming temperature mainly due to nitrite accumulation.
If can realize good denitrification effect in the situation that the C/N that disposes of sewage is lower, 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 object of the invention is in order to solve the problems of the technologies described above, propose a kind ofly by anoxic/aerobic SBR-DEAMOX denitrification process, to process low C/N than the method for (C/N < 4) municipal effluent, by former moisture, be specifically two portions, a part enters anoxic/aerobic sbr reactor device, utilizes in former water carbon source to remove on this reactor and remains NO after cycle draining
3 --N, then by aeration by NH in former water
4 +-N is oxidized to NO
3 --N, the former water of the nitrification liquid of discharge and another part enters DEAMOX(part denitrification coupling Anammox again) reactor, utilizes a small amount of carbon source in former water by NO in nitrification liquid
3 --N is reduced to NO
2 --N, NO
2 --N and NH
4 +-N is reacted and is generated N by Anammox
2thereby, reach low C/N than the object of city sewage deep denitrogenation.
The object of the invention is to be achieved through the following technical solutions:
A 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 is connected with anoxic/aerobic sbr reactor device 3 by the 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 is connected 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 is connected with intermediate water tank 3; Raw water box is connected with intermediate water tank by the second peristaltic pump 3.1; Intermediate water tank is connected with DEAMOX reactor 4 by the 3rd peristaltic pump 4.1; DEAMOX reactor is provided with whipping appts 4.2 and temperature-control device 4.3.
Anoxic/aerobic SBR-DEAMOX denitrification process is processed low C/N than the method for municipal effluent, it is characterized in that, comprises following process:
DEAMOX reactor inoculation Anammox mud and sludge hydrolysis acidification coupling denitrification mud are the mixed mud of 2.5～3.8:1 by volume, DEAMOX reactor sludge concentration MLSS=1500～2500mg/L after inoculation.Wherein, sludge hydrolysis acidification coupling denitrification mud carrys out 6 months above sludge hydrolysis acidification coupling denitrification reactors of self-operating, this reactor water inlet NO
3 --N=30～60mg/L, NO
3 --N clearance is 90%～100%, and this mud has incomplete Denitrification Characteristics, in the lower situation of organic carbon source concentration, and can only be by NO
3 --N is reduced to NO
2 --N; Anammox mud comes 10 months above anaerobic ammonia oxidation reactors of self-operating, 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%.
65%～85% sewage that in raw water box, each cycle is processed total sewage quantity pumps into anoxic/aerobic sbr reactor device, and controlling its sludge concentration MLSS is 1500～3000mg/L; Anoxia stirring 1～2h after anoxic/aerobic sbr reactor device water inlet; Aeration agitation 2～4h subsequently, in aeration process, Dissolved Oxygen concentration Control is at 2.0～4.0mg/L; Aeration finishes postprecipitation 30～60min, then nitrification liquid is expelled to intermediate water tank, and draining ratio is 40%～60%.
15%～35% sewage that in raw water box, each cycle is processed total sewage quantity pumps into intermediate water tank, mixes with nitrification liquid; Mixed solution in intermediate water tank pumps into DEAMOX reactor, and anoxia stirring 2～5h after water inlet end, then precipitates 30～60min, discharges supernatant liquor, and draining ratio is 40%～60%.
Know-why:
Anoxic/aerobic SBR-DEAMOX denitrification process is processed low C/N and is referred to by each cycle being processed to total sewage quantity and be divided into two portions than municipal effluent, and first 65%～85% sewage enters anoxic/aerobic sbr reactor device, remaining NO in system after a upper end cycle
3 --N utilizes organic carbon source in this part water inlet to carry out denitrification, then passes through aerobic stage by the NH in 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 DEAMOX reactor; In the sludge hydrolysis acidification coupling denitrification mud of DEAMOX reactor inoculation, comprise the flora that a class has incomplete denitrification attribute, it can only be by NO under the lower condition of organic concentration
3 --N is reduced to NO
2 --N; The NO that in DEAMOX reactor, denitrification process produces
2 --N is the NH synchronously and in former water again
4 +-N realizes the removal of nitrogen by the effect of anaerobic ammonia oxidizing bacteria in seed sludge.
The anoxic the present invention relates to/aerobic SBR-DEAMOX denitrification process is processed low C/N and is had the following advantages than municipal effluent:
1) for the municipal effluent denitrogenation of low C/N ratio, compare with traditional nitration denitrification technique, without additional carbon, denitrification process only need make full use of carbon source in former water can meet water outlet requirement;
2) in treating processes, the organism in a part of sewage is consumed because of Prepositive denitrification, and in aeration process subsequently, requisite oxygen tolerance reduces, in addition, and the NH in partial raw water
4 +-N, without oxidation, is reacted and is removed by Anammox, has therefore saved the required aeration rate of whole reaction process, thereby has greatly reduced the working cost in sewage treatment process.
3) whole technological operation is simple, only need to set time and the flooding velocity in each stage in reaction process, and without complicated control process, water outlet TN can meet emission standard.
Accompanying drawing explanation
Fig. 1 is that anoxic/aerobic SBR-DEAMOX denitrification process is processed low C/N than the schema of municipal effluent.
Embodiment
Below in conjunction with accompanying drawing and specific examples, the invention will be further described:
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.
In raw water box 1, a part of sewage is connected with anoxic/aerobic sbr reactor device 2 by the 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 is connected 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 is connected with intermediate water tank 3; Raw water box is connected with intermediate water tank by the second peristaltic pump 3.1; The 3rd peristaltic pump 4.1 is connected intermediate water tank with DEAMOX reactor 4; 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 hydrolysis acidification coupling denitrification mud are the mixed mud of 3:1 by volume, DEAMOX reactor sludge concentration MLSS=1500～2500mg/L after inoculation.Wherein, sludge hydrolysis acidification coupling denitrification mud carrys out 6 months above sludge hydrolysis acidification coupling denitrification reactors of self-operating, this reactor water inlet NO
3 --N=30～60mg/L, NO
3 --N clearance is 90%～100%, and this mud has incomplete Denitrification Characteristics, in the lower situation of organic carbon source concentration, and can only be by NO
3 --N is reduced to NO
2 --N; Anammox mud comes 10 months above anaerobic ammonia oxidation reactors of self-operating, 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 Families Home of Beijing University of Technology sanitary sewage for former hydromining used, significant parameter is: COD=200～300mg/L, NH
4 +-N=60～85mg/L, TN=60～90mg/L; Its C/N, than between 2.2～3.5, belongs to typical low C/N and compares municipal effluent; Raw water collection is in raw water box; It is 7.5L that anoxic/aerobic SBR-DEAMOX denitrification process each cycle is processed total sewage quantity.
Anoxic/aerobic sbr reactor device useful volume is 12L, and temperature is controlled at 25～28 ℃, and it is 5 days that sludge age SRT controls.The sewage of first total sewage quantity 80% pumps into anoxic/aerobic sbr reactor device, and water inlet volume is 6L; Anoxia stirring 1h after water inlet; Aeration agitation 3h subsequently, dissolved oxygen concentration 2.0～4.0mg/L in Controlling System; Aeration finishes postprecipitation 30min, then nitrification liquid is expelled to intermediate water tank, and draining ratio is 50%, NH in nitrification liquid
4 +-N=5～10mg/L, NO
3 --N=30～40mg/L;
The sewage that in raw water box, each cycle is processed total sewage quantity 20% enters intermediate water tank by peristaltic pump, and 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 7.5L intermediate water tank is pumped into DEAMOX reactor, DEAMOX reactor useful volume 15L, temperature is controlled at 28～30 ℃, and SRT is 30 days, anoxia stirring 3h after water inlet; Precipitation 40min; Afterwards supernatant liquor is discharged, draining ratio is 50%, and each cycle volume of displacement is 7.5L, water outlet NH
4 +-N < 2mg/L, TN < 5mg/L, TN clearance reaches 88%～90%.
Long run test result shows:
Take real life sewage as water inlet, and it is 2000～2500mg/L that anoxic/aerobic sbr reactor device sludge concentration MLSS controls, and SRT is 5 days, anoxia stirring 1h, and aeration agitation 3h, draining ratio is 50%; DEAMOX reactor sludge concentration MLSS control is simultaneously 1500～2500mg/L, and SRT is 30 days, and draining ratio is 50%; When whole system each cycle is disposed of sewage 7.5L, water outlet NH
4 +-N < 2mg/L, TN < 5mg/L, TN clearance reaches 91%～95%, can realize city sewage deep denitrogenation.
Claims (2)
1. for a device for anoxic/aerobic SBR-DEAMOX denitrification process, it is characterized in that, comprise raw water box (1), anoxic/aerobic sbr reactor device (2), intermediate water tank (3), DEAMOX reactor (4);
Raw water box (1) is connected with anoxic/aerobic sbr reactor device (3) by the 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) is connected 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 is connected with intermediate water tank (3); Raw water box is connected with intermediate water tank by the second peristaltic pump (3.1); Intermediate water tank is connected with DEAMOX reactor (4) by the 3rd peristaltic pump (4.1); DEAMOX reactor is provided with whipping appts (4.2) and temperature-control device (4.3).
Application rights require 1 described in device carry out anoxic/aerobic SBR-DEAMOX denitrification process and process low C/N than the method for municipal effluent, it is characterized in that, comprise following process:
DEAMOX reactor inoculation Anammox mud and sludge hydrolysis acidification coupling denitrification mud are the mixed mud of 2.5～3.8:1 by volume, DEAMOX reactor sludge concentration MLSS=1500～2500mg/L after inoculation; Wherein, sludge hydrolysis acidification coupling denitrification mud carrys out 6 months above sludge hydrolysis acidification coupling denitrification reactors of self-operating, this reactor water inlet NO
3 --N=30～60mg/L, NO
3 --N clearance is 90%～100%; Anammox mud comes 10 months above anaerobic ammonia oxidation reactors of self-operating, 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%;
65%～85% sewage that in raw water box, each cycle is processed total sewage quantity pumps into anoxic/aerobic sbr reactor device, and controlling reactor sludge concentration MLSS is 1500～3000mg/L; Anoxia stirring 1～2h after anoxic/aerobic sbr reactor device water inlet; Aeration agitation 2～4h subsequently, in aeration process, Dissolved Oxygen concentration Control is at 2.0～4.0mg/L; Aeration finishes postprecipitation 30～60min, then nitrification liquid is expelled to intermediate water tank, and draining ratio is 40%～60%;
15%～35% sewage that in raw water box, each cycle is processed total sewage quantity pumps into intermediate water tank, mixes with nitrification liquid; Mixed solution in intermediate water tank pumps into DEAMOX reactor; Anoxia stirring 2～5h after the water inlet of DEAMOX reactor; Then precipitate 30～60min, discharge supernatant liquor, draining ratio is 40%～60%.
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