CN104163493B - The method of micro-aeration nitrated associating sludge fermentation coupling denitrification process low ratio of carbon to ammonium sanitary sewage - Google Patents
The method of micro-aeration nitrated associating sludge fermentation coupling denitrification process low ratio of carbon to ammonium sanitary sewage Download PDFInfo
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- CN104163493B CN104163493B CN201410361653.2A CN201410361653A CN104163493B CN 104163493 B CN104163493 B CN 104163493B CN 201410361653 A CN201410361653 A CN 201410361653A CN 104163493 B CN104163493 B CN 104163493B
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Abstract
The method of micro-aeration nitrated associating sludge fermentation coupling denitrification process low ratio of carbon to ammonium sanitary sewage, belongs to sewage sludge process field.Device comprises: former pond, storage basin, main reactor, blowoff basin, air compressor, spoil disposal pond and automatic control system.Main reactor is provided with agitator, temperature control unit, gas meter and aerating apparatus.Method is: the spoil disposal of inoculation excess sludge fermentation system when running first, municipal effluent excess sludge that biological denitrification system is arranged and sanitary sewage is injected to main reactor when each cycle is run, ammonia nitrogen in mixed solution is converted into nitrite nitrogen by nitration reaction, and then the internal carbon source utilizing sludge fermentation to produce carries out anti-nitration reaction.The present invention adopts micro-aeration in the nitrated stage, and the denitrification stage, without the need to adding outer carbon source, finally achieves the object of to carry out sludge internal carbon source exploitation, nitration reaction and the reaction of fermentation coupling denitrification in same reactor.
Description
Technical field
The present invention relates to the method for a kind of micro-aeration nitrated combined ferment coupling denitrification process low ratio of carbon to ammonium sanitary sewage, belong to technical field of biological sewage treatment.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 causes showing great attention to of people.Meanwhile, the emission standard for nitrogen is also increasingly strict.China is that ammonia nitrogen is less than 5mg/L to the one-level emission standard A of nitrogen in " urban wastewater treatment firm pollutant emission standard " (GB18918-2002) within 2002, to promulgate, 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, which results in and about have municipal sewage plant's total nitrogen of 1/3rd to be difficult to up to standard, need the mode by adding outer carbon source in the denitrification stage to reach one-level emission standard A.
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 while water purification.The sludge quantity that China produces every year is especially up to more than 100,000,000 tons.Therefore, the excess sludge process 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 the problem solving sewage disposal carbon source deficiency, can realize again the minimizing harmless treatment of mud.But existing majority research is often confined to the exploitation of sludge internal carbon source, after namely sludge fermentation produces acid, by the mode eluriated organic acid put in reactor and utilize.The mode of this fermentation-elutriation has following deficiency: 1, because mixing sludge is in anaerobic environment for a long time, causes mud viscosity to raise, not easily mud-water separation; 2, anaerobic fermentation process is difficult to avoid methane phase to react generation completely, and methane phase process can consume bulk fermentation product; 3, general lower owing to eluriating efficiency, to improve voltaile fatty acid (Volatile Fatty Acid, the VFA) stripping quantity in liquid phase, then 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 fermented liquid being injected subsequent processing units, influent load can be increased.
Summary of the invention
In order to solve the problem, the present invention utilizes sequencing batch reactor to be coupled in same system by nitrated, the denitrification of sludge fermentation, city domestic sewage, the organic acid utilizing sludge fermentation to produce carries out denitrification for carbon source, without the need to additional carbon, enhances 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 utilizes tunning to carry out the coupling of anti-nitration reaction, thus the system water outlet of making reaches one-level A standard.
The present invention is realized by following technological step:
A method for micro-aeration nitrated associating sludge fermentation coupling denitrification process low ratio of carbon to ammonium sanitary sewage, 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, an agitator, temperature control unit, pH sensor, DO sensor is provided with 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 No. two agitators.
Former pond, intake pump are connected successively with water inlet pipe one end, 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. are connected successively with water shoot one end, and the water shoot the other end is connected with main reactor; Spoil disposal pond, draining rly. are connected successively with shore pipe one end, 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.
A method for micro-aeration nitrated associating sludge fermentation coupling denitrification process low ratio of carbon to ammonium sanitary sewage, its feature comprises the following steps:
1) seed sludge: the seed sludge adopted during micro-aeration nitrated associating sludge fermentation coupling denitrification main reactor initiating switchup is from sludge digestion system spoil disposal, and its sludge concentration is 10-13kgMLSS/m
3, and the mixing sludge concentration after mud of intaking for the first time is 5-8kgMLSS/m
3;
2) start up system: open intake pump, enter dredge pump, an agitator, No. two agitators, air compressor, open process controller able to programme and computer, arranging DO is 0.5-0.8mg/L, and set temperature is 30 ± 1 DEG C;
3) enter mud: start into dredge pump, enter in main reactor by the fresh residual sludge pump in storage basin, 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 entering mud and seed sludge is 1/5 to 3/10;
4) intake: start intake pump, pump in main reactor by the city domestic sewage in former pond, water inlet volume accounts for the 2/5-3/5 of main reactor useful volume;
5) aerobic stage: the nitrated stage adopts micro-aeration, controlling air compressor by process controller able to programme makes dissolved oxygen control at 0.5-0.8mg/L, 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) anoxic phases: control an agitator by process controller able to programme, rotating speed is 80-100rpm, and process controller able to programme is collected pH sensor feedback signal and transferred to computer, when the first order derivative of pH signal is by when just becoming negative, close an agitator, enter next step;
7) leave standstill: the time of staticly settling is 30-60min, after precipitation terminates, enter next step;
8) draining: control draining rly. by process controller able to programme, volume of displacement is the 2/5-3/5 of main reactor useful volume;
9) spoil disposal: control spoil disposal rly. by process controller 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 utilizes tunning to carry out the coupling of anti-nitration reaction.The city domestic sewage C/N of the method for the invention process is less than 3, and influent ammonium concentration is 50mg/L.First in the ammonia oxidation stage, dissolved oxygen controls 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, while fermenting bacteria carries out digesting, the internal carbon source that denitrifying bacterium utilizes sludge fermentation to produce carries out anti-nitration reaction, thus achieves the reaction of fermentation coupling denitrification.In addition, owing to adopting micro-aeration previous stage, therefore considerable influence can not be produced 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) in the same space, achieve the nitration reaction of city domestic sewage, the reaction of fermentation coupling denitrification, without the need to additional carbon, the total nitrogen one-level emission standard A of low C/N city domestic sewage can be realized;
2) adopt micro-aeration in the nitrated stage, neither the acid-producing activity of destroy fermentation-causing bacterium, again saves energy consumption;
3) nitrite nitrogen of short distance nitration water outlet is the fermentation coupling denitrification stage provide stable anaerobic environment, and denitrification process produces basicity simultaneously, has neutralized the short chain fatty acid that digestion reaction produces, has effectively facilitated digestive efficiency;
4) compared to traditional anaerobic digestion process, the existence of nitrite nitrogen avoids methanogen and consumes sludge fermentation product, thus makes tunning fully for denitrogenation.
Accompanying drawing explanation
Fig. 1 is structure drawing of device of the present invention:
1-former pond 1.1-intake pump 1.2-water inlet pipe
No. bis-, 2-storage basin 2.1-stirs 2.2-and enters dredge pump 2.3-and enter mud pipe and mix device
3-main reactor 3.1-agitator 3.2-temperature sensor 3.3-gas meter 3.4-pH sensor
3.5-DO passes 3.6-aeration head sensor
4-air pressure 5-blowoff basin 5.1-draining relay 5.2-water shoot contracting machine
6-spoil disposal pond 6.1-spoil disposal continues 6.2-shore pipe electrical equipment
7-process controller 7.1-pH able to programme sensor 7.2-DO sensor interface interface
7.3-water inlet relay interface 7.4-agitator interface
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.
A method for micro-aeration nitrated associating sludge fermentation coupling denitrification process low ratio of carbon to ammonium sanitary sewage, 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, an agitator 3.1 is provided with 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 passes through into dredge pump 2.2, enters mud pipe 2.3 and be connected with main reactor, storage basin 2 top is provided with No. two agitators 2.1, 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, spoil disposal relay interface 7.8, enters mud relay interface 7.9, and process controller 7 the other end able to programme is 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 excess sludge, from city domestic sewage pilot scale excess sludge that denitrification system is arranged, concentrates and is placed on (MLSS=10-13kgMLSS/m in storage basin
3, MLVSS=8-11kgMLSS/m
3).Micro-aeration associating sludge fermentation coupling denitrification main reactor useful volume is 10L, and run inoculation digested sludge 4L first, 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 controls at 30 DEG C.Carrying out practically process is as follows:
1) seed sludge: the seed sludge adopted during micro-aeration nitrated associating sludge fermentation coupling denitrification main reactor initiating switchup is from sludge digestion system spoil disposal, and its sludge concentration is 12kgMLSS/m
3, the fresh excess sludge added first is from city domestic sewage pilot scale denitrification system, and its sludge concentration is 11kgMLSS/m
3, and the mixing sludge concentration after mud of intaking for the first time is 6.1kgMLSS/m
3.
2) start up system: open intake pump, enter dredge pump, an agitator, No. two agitators, air compressor, open process controller able to programme and computer, arranging DO is 0.5-0.8mg/L, and set temperature is 30 ± 1 DEG C;
3) enter mud: start into dredge pump, enter in main reactor by the fresh residual sludge pump in storage basin, 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) intake: start intake pump, enter in main reactor by the sanitary pump in former pond, water inlet pump speed is 480ml/min, and flooding time is 10min;
5) aerobic stage: the nitrated stage adopts micro-aeration, controlling air compressor by process controller able to programme makes dissolved oxygen control at 0.5-0.8mg/L, 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) anoxic phases: control an agitator by process controller able to programme, rotating speed is 80rpm, and process controller able to programme is collected pH sensor feedback signal and transferred to computer, when the first order derivative of pH signal is by when just becoming negative, close an agitator, enter next step subsequently;
7) leave standstill: the time of staticly settling is 30min, after precipitation terminates, enter next step;
8) draining: control draining rly. by process controller able to programme, volume of displacement is 4.8L, and water discharge time is 2min;
9) spoil disposal: after draining terminates, starts an agitator, controls spoil disposal rly., spoil disposal 1.2L by process controller able to programme;
10) stir:, churning time is 9h;
11) circulation step (3)---(10).
Continuous operation result shows: at 30 DEG C, and DO concentration is 0.5-0.8mg/L, and in reactor, sludge concentration is 5-8kgMLSS/m
3, when water inlet C/N is less than 3, 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 achieves 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, finally achieves the denitrification process of low C/N sanitary sewage.
Claims (1)
1. the method for micro-aeration nitrated associating sludge fermentation coupling denitrification process low ratio of carbon to ammonium sanitary sewage, application is as lower device, and this 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); Former pond (1), storage basin (2), air compressor (4), blowoff basin (5), spoil disposal pond (6) are connected with main reactor (3) respectively, an agitator (3.1), temperature sensor (3.2), pH sensor (3.4), DO sensor (3.5) is provided with 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) are connected successively with one end of water inlet pipe (1.2), 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 the one end 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) are connected successively with shore pipe (6.2) one end, 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), 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 able to programme (7) the other end is connected with computer (8);
Its feature comprises the following steps:
1) seed sludge: the seed sludge adopted during micro-aeration nitrated associating sludge fermentation coupling denitrification main reactor initiating switchup is from sludge digestion system spoil disposal, and its sludge concentration is 10-13kgMLSS/m
3, and the mixing sludge concentration after mud of intaking for the first time is 5-8kgMLSS/m
3;
2) start up system: open intake pump, enter dredge pump, an agitator, No. two agitators, air compressor, open process controller able to programme and computer, arranging DO is 0.5-0.8mg/L, and set temperature is 30 ± 1 DEG C;
3) enter mud: start into dredge pump, enter in main reactor by the fresh residual sludge pump in storage basin, 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 entering mud and seed sludge is 1/5 to 3/10;
4) intake: start intake pump, pump in main reactor by the city domestic sewage in former pond, water inlet volume accounts for the 2/5-3/5 of main reactor useful volume;
5) aerobic stage: the nitrated stage adopts micro-aeration, controlling air compressor by process controller able to programme makes dissolved oxygen control at 0.5-0.8mg/L, 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) anoxic phases: control an agitator by process controller able to programme, rotating speed controls 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 by when just becoming negative, close an agitator, enter next step;
7) leave standstill: the time of staticly settling is 30-60min, after precipitation terminates, enter next step;
8) draining: control draining rly. by process controller able to programme, volume of displacement is the 2/5-3/5 of main reactor useful volume;
9) spoil disposal: control spoil disposal rly. by process controller 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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| 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 |
| CN109485149B (en) * | 2018-12-22 | 2022-04-22 | 北京工业大学 | Device and method for realizing advanced denitrification and excess sludge reduction of late landfill leachate |
| 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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| 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 |
| 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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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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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