CN104163493A - Micro-aeration nitration combined sludge fermentation and denitrification coupled method for processing domestic sewage with low carbon nitrogen ratio - Google Patents
Micro-aeration nitration combined sludge fermentation and denitrification coupled method for processing domestic sewage with low carbon nitrogen ratio Download PDFInfo
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Abstract
A micro-aeration nitration combined sludge fermentation and denitrification coupled method for processing domestic sewage with low carbon nitrogen ratio belongs to the field of sewage and sludge processing. A device comprises a raw water pit, a mud storage tank, a main reactor, a water drain tank, an air compressor, a sludge discharge tank and an automatic control system. A stirrer, a temperature control device, a gas flowmeter and an aeration device are arranged on the main reactor. The method is as follows: during initial operation, discharged sludge of a residual sludge fermentation system is inoculated; during each periodic operation, residual sludge and domestic sewage which are discharged from an urban sewage biological denitrification system are injected into the main reactor; ammonia nitrogen in a mixed liquor undergoes a nitratlon reaction to be converted to nitrite nitrogen; and furthermore, an internal carbon source generated by sludge fermentation is used to carry out a denitrification reaction. According to the invention, micro-aeration is adopted in the stage of nitration, and there is no need to add an external carbon source in the stage of denitrification. Finally, the purpose of realizing development of an internal carbon source in sludge, a nitratlon reaction and a fermentation coupled denitrification reaction in a same reactor is achieved.
Description
Technical field
The present invention relates to the nitrated combined ferment coupling denitrification of a kind of micro-aeration and process the method for low ratio of carbon to ammonium sanitary sewage, belong to dirty water living creature processing technique field.This technique is applicable to the strengthened denitrification biological treatment of low ratio of carbon to ammonium (COD mass concentration/total nitrogen concentration, C/N) city domestic sewage.
Background technology
Day by day serious along with body eutrophication, nitrate pollution problem has caused showing great attention to of people.Meanwhile, also increasingly strict for the emission standard of nitrogen." urban wastewater treatment firm pollutant emission standard " that China promulgated in 2002 is that ammonia nitrogen is less than 5mg/L to the one-level A emission standard of nitrogen in (GB18918-2002), and total nitrogen is less than 15mg/L.But, the problem that the ubiquitous carbon-nitrogen ratio of China's municipal effluent is on the low side becomes municipal sewage treatment bottleneck up to standard gradually, it is up to standard that this has caused approximately having municipal sewage plant's total nitrogen of 1/3rd to be difficult to, and need to reach one-level A emission standard by the mode that adds outer carbon source in the denitrification stage.
Activated sludge process is one of common method of current municipal sewage treatment use, and activated sludge process can produce a considerable number of excess sludge in water purification.The annual sludge quantity producing of China is especially up to more than 100,000,000 tons.Therefore, the excess sludge processing problem of sewage biological treatment system is another Focal point and difficult point of municipal sewage plant.
In recent years, the development and utilization of sludge internal carbon source becomes new study hotspot.This had both contributed to solve the problem of sewage disposal carbon source deficiency, can realize again the minimizing harmless treatment of mud.But existing most research is often confined to the exploitation of sludge internal carbon source, sludge fermentation is produced after acid, by the mode of eluriating, organic acid is put in reactor and is utilized.The mode of this fermentation-elutriation has following deficiency: 1, because mixing sludge is for a long time in anaerobic environment, cause mud viscosity to raise, be difficult for mud-water separation; 2, anaerobic fermentation process is difficult to avoid produce methane reaction generation completely, can consume bulk fermentation product and produce methane process; 3, generally lower owing to eluriating efficiency, if will improve voltaile fatty acid (Volatile Fatty Acid, the VFA) stripping quantity in liquid phase, need to strengthen and eluriate the water yield and eluriate number of times; 4, because fermenting process can discharge higher ammonia nitrogen and phosphoric acid salt, when being injected to subsequent disposal unit, fermented liquid can increase influent load.
Summary of the invention
In order to address the above problem, the present invention utilizes sequencing batch reactor that nitrated, the denitrification of sludge fermentation, city domestic sewage are coupled in same system, the organic acid that utilizes sludge fermentation to produce carries out denitrification for carbon source, without additional carbon, has strengthened the denitrification effect of low C/N sewage.The present invention can realize micro-aeration oxidative ammonolysis in same reactor, fermentation produces internal carbon source, original position and utilizes tunning to carry out the coupling of anti-nitration reaction, thereby the system water outlet of making reaches one-level A standard.
The present invention realizes by following technological step:
The nitrated associating sludge fermentation of micro-aeration coupling denitrification is processed a method for low ratio of carbon to ammonium sanitary sewage, and its device comprises: former pond, storage basin, main reactor, air compressor, blowoff basin, spoil disposal pond, process controller able to programme and computer.Former pond, storage basin, air compressor, blowoff basin, spoil disposal pond are connected with main reactor respectively, be provided with agitator, temperature control unit, pH sensor, DO sensor at main reactor top, side is provided with gas meter, water inlet pipe, enters mud pipe, rising pipe, shore pipe, and bottom is provided with aerating apparatus; Storage basin top is provided with agitator No. two.
Former pond, intake pump and water inlet pipe one end are connected successively, and the water inlet pipe the other end is connected with main reactor; Storage basin, enter dredge pump and enter mud pipe one end and be connected successively, enter the mud pipe the other end and be connected with main reactor; Blowoff basin, draining rly. and water shoot one end are connected successively, and the water shoot the other end is connected with main reactor; Spoil disposal pond, draining rly. and shore pipe one end are connected successively, and the shore pipe the other end is connected with main reactor; Air compressor is connected with main reactor by gas meter;
Process controller able to programme is built-in with pH sensor interface, DO sensor interface, water inlet relay interface, agitator interface, temperature control sensor interface, aeration relay interface, draining relay interface, a spoil disposal relay interface, enters mud relay interface, and the process controller the other end able to programme is connected with computer.
The nitrated associating sludge fermentation of micro-aeration coupling denitrification is processed a method for low ratio of carbon to ammonium sanitary sewage, and its feature comprises the following steps:
1) seed sludge: the seed sludge adopting when the nitrated associating sludge fermentation of micro-aeration coupling denitrification main reactor starts is first from sludge digestion system spoil disposal, and its sludge concentration is 10-13kgMLSS/m
3, and the mixing sludge concentration of intaking for the first time after mud is 5-8kgMLSS/m
3;
2) startup system: open intake pump, enter dredge pump, agitator, No. two agitators, air compressor, open process controller able to programme and computer, it is 0.5-0.8mg/L that DO is set, and set temperature is 30 ± 1 DEG C;
3) enter mud: start into dredge pump, the fresh residual sludge pump in storage basin is entered in main reactor, excess sludge is arranged excess sludge by municipal effluent biological denitrification system, and sludge concentration is concentrated into 10-13kgMLSS/m
3, the mass concentration ratio that enters mud and seed sludge is 1/5 to 3/10;
4) water inlet: start intake pump, the city domestic sewage in former pond is pumped in main reactor, water inlet volume accounts for the 2/5-3/5 of main reactor useful volume;
5) aerobic stage: the nitrated stage adopts micro-aeration, make dissolved oxygen be controlled at 0.5-0.8mg/L by process controller control air compressor able to programme, process controller able to programme is collected pH sensor feedback signal and is conveyed into computer, when the first order derivative of pH signal is by bearing change timing, close air compressor;
6) the anoxic stage: by agitator of process controller control able to programme, rotating speed is 80-100rpm, and process controller able to programme is collected pH sensor feedback signal and also transferred to computer, when the first order derivative of pH signal is when just becoming negative, close agitator No. one, enter next step;
7) leave standstill: the time of staticly settling is 30-60min, after precipitation finishes, enter next step;
8) draining: by process controller control draining rly. able to programme, volume of displacement is the 2/5-3/5 of main reactor useful volume;
9) spoil disposal: by process controller control spoil disposal rly. able to programme, spoil disposal is than being 1:12.5-1:8;
10) stir: start an agitator by process controller able to programme, churning time is 6-10h;
11) circulation step (3)---(10).
Principle of the present invention: the present invention can realize micro-aeration oxidative ammonolysis in same reactor, fermentation produces internal carbon source, original position and utilizes tunning to carry out the coupling of anti-nitration reaction.The city domestic sewage C/N of the method for the invention processing is less than 3, and influent ammonium concentration is 50mg/L.First in the ammonia oxidation stage, dissolved oxygen is controlled at 0.5-0.8mg/L, and nitrobacteria utilizes dissolved oxygen to carry out nitration reaction, is nitrite nitrogen by mineralized nitrogen; In the denitrification stage, when fermenting bacteria digests, the internal carbon source that denitrifying bacterium utilizes sludge fermentation to produce carries out anti-nitration reaction, has realized thus the reaction of fermentation coupling denitrification.In addition, owing to adopting micro-aeration previous stage, therefore can not produce considerable influence to fermenting bacteria.Anti-nitration reaction carries out anaerobic digestion, for next cycle provides internal carbon source after stopping.
Compared with prior art, the present invention has the following advantages:
1) nitration reaction, the fermentation coupling denitrification of in the same space, having realized city domestic sewage react, and without additional carbon, can realize the total nitrogen one-level A emission standard of low C/N city domestic sewage;
2) adopt micro-aeration in the nitrated stage, the neither acid-producing activity of destroy fermentation-causing bacterium, has saved again energy consumption;
3) nitrite nitrogen of short distance nitration water outlet provides stable anaerobic environment for fermentation in the coupling denitrification stage, and denitrification process produces basicity simultaneously, has neutralized the short chain fatty acid that digestion reaction produces, and has effectively promoted digestive efficiency;
4), compared to traditional anaerobic digestion process, the existence of nitrite nitrogen has avoided methanogen to consume sludge fermentation product, thereby makes tunning fully for denitrogenation.
Brief description of the drawings
Fig. 1 is structure drawing of device of the present invention:
The former pond of 1-1.1-intake pump 1.2-water inlet pipe
No. bis-agitator 2.2-of 2-storage basin 2.1-enter dredge pump 2.3-and enter mud pipe
Agitator 3.2-temperature sensor 3.3-gas meter 3.4-pH sensor of 3-main reactor 3.1-
3.5-DO sensor 3.6-aeration head
4-air compressor 5-blowoff basin 5.1-draining rly. 5.2-water shoot
6-spoil disposal pond 6.1-spoil disposal rly. 6.2-shore pipe
7-process controller 7.1-pH able to programme sensor interface 7.2-DO sensor interface
Agitator interface of 7.3-water inlet relay interface 7.4-
7.5-temperature control sensor interface 7.6-aeration relay interface
7.7-draining relay interface 7.8-spoil disposal relay interface
7.9-enters mud relay interface 8-computer
Embodiment
By reference to the accompanying drawings 1 and embodiment the present invention will be further described.
The nitrated associating sludge fermentation of micro-aeration coupling denitrification is processed a method for low ratio of carbon to ammonium sanitary sewage, and its device comprises: former pond 1, storage basin 2, main reactor 3, air compressor 4, blowoff basin 5, spoil disposal pond 6, process controller able to programme 7 and computer 8.Micro-aeration associating sludge fermentation coupling denitrification main reactor 3 adopts cylindrical structural, be provided with No. one agitator 3.1 at its top, temperature sensor 3.2, pH sensor 3.4, DO sensor 3.5, side is provided with gas meter 3.3, both sides are respectively equipped with water inlet pipe 1.2, enter mud pipe 2.3, rising pipe 5.2, shore pipe 6.2, and bottom is provided with aerating apparatus 3.6.
Former pond 1 is connected with main reactor 3 by intake pump 1.1, water inlet pipe 1.2, storage basin 2 by entering dredge pump 2.2, enter mud pipe 2.3 and be connected with main reactor, storage basin 2 tops are provided with agitator 2.1 No. two, blowoff basin 5 is connected with main reactor 3 by draining rly. 5.1, water shoot 5.2, spoil disposal pond 6 is connected with main reactor 3 by spoil disposal rly. 6.1, shore pipe 6.2, and air compressor 4 is connected with main reactor 3 by gas meter 3.3.
Process controller 7 able to programme is built-in with pH sensor interface 7.1, DO sensor interface 7.2, water inlet relay interface 7.3, agitator interface 7.4, temperature control sensor interface 7.5, aeration relay interface 7.6, draining relay interface 7.7, a spoil disposal relay interface 7.8, enters mud relay interface 7.9, and process controller 7 the other ends able to programme are connected with computer 8.
The present invention is with sanitary sewage (pH=7.0-7.9, the NH of certain university's dependents' district discharge
4 +-N=58-68mg/L, COD=120-140mg/L) be research object.Experiment seed sludge is from certain sludge from wastewater treatment plant excess sludge that Digestive tract is arranged, and experiment, concentrates and is placed on (MLSS=10-13kgMLSS/m in storage basin from city domestic sewage pilot scale excess sludge that denitrification system is arranged with excess sludge
3, MLVSS=8-11kgMLSS/m
3).Micro-aeration associating sludge fermentation coupling denitrification main reactor useful volume is 10L, the digested sludge of operation inoculation first 4L, and each cycle adds fresh excess sludge 1.2L, water inlet 4.8L, NH after mixing
4 +-N concentration is 35mg/L, and sludge concentration is 6.1kgMLSS/m
3, temperature of reaction is controlled at 30 DEG C.Concrete operational process is as follows:
1) seed sludge: the seed sludge adopting when the nitrated associating sludge fermentation of micro-aeration coupling denitrification main reactor starts is first from sludge digestion system spoil disposal, and its sludge concentration is 12kgMLSS/m
3, the fresh excess sludge adding is first from city domestic sewage pilot scale denitrification system, and its sludge concentration is 11kgMLSS/m
3, and the mixing sludge concentration of intaking for the first time after mud is 6.1kgMLSS/m
3.
2) startup system: open intake pump, enter dredge pump, agitator, No. two agitators, air compressor, open process controller able to programme and computer, it is 0.5-0.8mg/L that DO is set, and set temperature is 30 ± 1 DEG C;
3) enter mud: start into dredge pump, the fresh residual sludge pump in storage basin is entered in main reactor, excess sludge is arranged excess sludge by municipal effluent biological denitrification system, and sludge concentration is 11kgMLSS/m
3, enter dredge pump speed for 240ml/min, entering the mud time is 5min;
4) water inlet: start intake pump, the sanitary pump in former pond is entered in main reactor, water inlet pump speed is 480ml/min, and flooding time is 10min;
5) aerobic stage: the nitrated stage adopts micro-aeration, make dissolved oxygen be controlled at 0.5-0.8mg/L by process controller control air compressor able to programme, process controller able to programme is collected pH sensor feedback signal and is conveyed into computer, when the first order derivative of pH signal is by bearing change timing, close air compressor, the nitrated time is about 3h;
6) the anoxic stage: by agitator of process controller control able to programme, rotating speed is 80rpm, and process controller able to programme is collected pH sensor feedback signal and also transferred to computer, when the first order derivative of pH signal is when just becoming negative, close agitator No. one, enter subsequently next step;
7) leave standstill: the time of staticly settling is 30min, after precipitation finishes, enter next step;
8) draining: by process controller control draining rly. able to programme, volume of displacement is 4.8L, and water discharge time is 2min;
9) spoil disposal: after draining finishes, start No. an agitator, by process controller control spoil disposal rly. able to programme, spoil disposal 1.2L;
10) stir:, churning time is 9h;
11) circulation step (3)---(10).
Operation result shows continuously: at 30 DEG C, DO concentration is 0.5-0.8mg/L, and in reactor, sludge concentration is 5-8kgMLSS/m
3, water inlet C/N is less than in 3 situation, and water outlet ammonia nitrogen is less than 5mg/L, and water outlet total nitrogen is less than 10mg/L, reaches " urban wastewater treatment firm pollutant emission standard " (GB18918-2002) one-level A standard.The present invention has realized in same reactor that micro-aeration is nitrated, the exploitation of sludge internal carbon source, utilize sludge internal carbon source to carry out denitrifying coupling, has finally realized the denitrification process of low C/N sanitary sewage.
Claims (2)
1. the nitrated associating sludge fermentation of micro-aeration coupling denitrification is processed a device for low ratio of carbon to ammonium sanitary sewage, it is characterized in that: comprise former pond (1), storage basin (2), main reactor (3), air compressor (4), blowoff basin (5), spoil disposal pond (6), process controller able to programme (7) and computer (8); Former pond (1), storage basin (2), air compressor (4), blowoff basin (5), spoil disposal pond (6) are connected with main reactor (3) respectively, be provided with an agitator (3.1), temperature sensor (3.2), pH sensor (3.4), DO sensor (3.5) at described main reactor (3) top, side is provided with gas meter (3.3), water inlet pipe (1.2), enters mud pipe (2.3), water shoot (5.2), shore pipe (6.2), and bottom is provided with aeration head (3.6); Storage basin (2) top is provided with No. two agitators (2.1);
Former pond (1), intake pump (1.1) and one end of water inlet pipe (1.2) are connected successively, and the water inlet pipe the other end is connected with main reactor (3); Storage basin (2), enter dredge pump (2.1) and be connected successively with one end of entering mud pipe (2.3), enter mud pipe (2.3) the other end and be connected with main reactor (3); Blowoff basin (5), draining rly. (5.1) are connected successively with water shoot one end (5.2), and described water shoot (5.2) the other end is connected with main reactor (3); Spoil disposal pond (6), draining rly. (6.1) and shore pipe (6.2) one end are connected successively, and shore pipe (6.2) the other end is connected with main reactor (3); Air compressor (4) is connected with main reactor (3) by gas meter (3.3);
Process controller able to programme (7) is built-in with pH sensor interface (7.1), DO sensor interface (7.2), water inlet relay interface (7.3), an agitator interface (7.4), temperature control sensor interface (7.5), aeration relay interface (7.6), draining relay interface (7.7), spoil disposal relay interface (7.8), enters mud relay interface (7.9), and process controller able to programme (7) the other end is connected with computer (8).
2. application rights requires the method for device processing low ratio of carbon to ammonium sanitary sewage described in 1, and its feature comprises the following steps:
1) seed sludge: the seed sludge adopting when the nitrated associating sludge fermentation of micro-aeration coupling denitrification main reactor starts is first from sludge digestion system spoil disposal, and its sludge concentration is 10-13kgMLSS/m
3, and the mixing sludge concentration of intaking for the first time after mud is 5-8kgMLSS/m
3;
2) startup system: open intake pump, enter dredge pump, agitator, No. two agitators, air compressor, open process controller able to programme and computer, it is 0.5-0.8mg/L that DO is set, and set temperature is 30 ± 1 DEG C;
3) enter mud: start into dredge pump, the fresh residual sludge pump in storage basin is entered in main reactor, excess sludge is arranged excess sludge by municipal effluent biological denitrification system, and sludge concentration is concentrated into 10-13kgMLSS/m
3, the mass concentration ratio that enters mud and seed sludge is 1/5 to 3/10;
4) water inlet: start intake pump, the city domestic sewage in former pond is pumped in main reactor, water inlet volume accounts for the 2/5-3/5 of main reactor useful volume;
5) aerobic stage: the nitrated stage adopts micro-aeration, make dissolved oxygen be controlled at 0.5-0.8mg/L by process controller control air compressor able to programme, process controller able to programme is collected pH sensor feedback signal and is conveyed into computer, when the first order derivative of pH signal is by bearing change timing, close air compressor;
6) the anoxic stage: by agitator of process controller control able to programme, rotating speed is controlled at 80-100rpm, process controller able to programme is collected pH sensor feedback signal and is transferred to computer, when the first order derivative of pH signal is when just becoming negative, close agitator No. one, enter next step;
7) leave standstill: the time of staticly settling is 30-60min, after precipitation finishes, enter next step;
8) draining: by process controller control draining rly. able to programme, volume of displacement is the 2/5-3/5 of main reactor useful volume;
9) spoil disposal: by process controller control spoil disposal rly. able to programme, spoil disposal is than being 1:12.5-1:8;
10) stir: start an agitator by process controller able to programme, churning time is 6-10h;
11) circulation step (3)---(10).
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105129986A (en) * | 2015-08-27 | 2015-12-09 | 上海晶宇环境工程股份有限公司 | Process for deeply removing total nitrogen in waste water by means of biological method and device of process |
| CN109485149A (en) * | 2018-12-22 | 2019-03-19 | 北京工业大学 | A kind of apparatus and method for realizing treatment of advanced stage landfill leachate advanced nitrogen and excess sludge reduction |
| CN110028153A (en) * | 2019-05-10 | 2019-07-19 | 北京工业大学 | A method of domestic sewage denitrifying and mud decrement are realized with sequencing batch reactor joint sludge fermentation |
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| CN103214092A (en) * | 2013-05-09 | 2013-07-24 | 中国科学院生态环境研究中心 | Biological denitrification device |
| CN103663862A (en) * | 2013-11-25 | 2014-03-26 | 北京工业大学 | Device and method for nitrogen and phosphorus removal for low CN ratio urban sewage through nitrosation and anaerobic ammonia oxidation coupling denitrifying phosphorus removal intensification |
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| CN102583705A (en) * | 2012-01-12 | 2012-07-18 | 北京工业大学 | Method and device for culturing oxidizing bacteria capable of quickly enriching nitrite |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105129986A (en) * | 2015-08-27 | 2015-12-09 | 上海晶宇环境工程股份有限公司 | Process for deeply removing total nitrogen in waste water by means of biological method and device of process |
| CN109485149A (en) * | 2018-12-22 | 2019-03-19 | 北京工业大学 | A kind of apparatus and method for realizing treatment of advanced stage landfill leachate advanced nitrogen and excess sludge reduction |
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| CN110028153A (en) * | 2019-05-10 | 2019-07-19 | 北京工业大学 | A method of domestic sewage denitrifying and mud decrement are realized with sequencing batch reactor joint sludge fermentation |
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