CN102432141B - Pre-anaerobic fermentation synchronous denitrification sewage denitrification and sludge reduction integrated device and method - Google Patents
Pre-anaerobic fermentation synchronous denitrification sewage denitrification and sludge reduction integrated device and method Download PDFInfo
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- CN102432141B CN102432141B CN201110346128XA CN201110346128A CN102432141B CN 102432141 B CN102432141 B CN 102432141B CN 201110346128X A CN201110346128X A CN 201110346128XA CN 201110346128 A CN201110346128 A CN 201110346128A CN 102432141 B CN102432141 B CN 102432141B
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Abstract
The invention provides a pre-anaerobic fermentation synchronous denitrification sewage denitrification and sludge reduction integrated device and a method. A raw water tank and a sludge storage tank in a system are connected with an anaerobic fermentation synchronous denitrification reactor; and the anaerobic fermentation synchronous denitrification reactor is connected with an intermediate watertank, an anaerobic-aerobic (A/O) nitrification reactor, a secondary sedimentation tank and a drain tank. The method comprises the following steps that: sewage and mixed sludge, together with nitrified liquid, enter the anaerobic fermentation synchronous denitrification reactor, water discharged by the anaerobic fermentation synchronous denitrification reactor is nitrified in the A/O nitrificationreactor and is subjected to mud-water separation by the secondary sedimentation tank, one part of nitrified liquid is refluxed to the anaerobic fermentation synchronous denitrification reactor, and the rest part is discharged; and the mixed sludge discharged by the secondary sedimentation tank is processed in the anaerobic fermentation synchronous denitrification reactor, and the mixed sludge of the system is discharged by the anaerobic fermentation synchronous denitrification reactor. By the device and the method, the carbon source utilization efficiency of urban sewage can be integrally improved, and the sludge yield of a sewage plant is reduced while denitrification is enhanced.
Description
Technical field
The invention belongs to sewage sludge biologic treating technique field, especially a kind of preposition anaerobically fermenting synchronous denitrification sewage water denitrification collection sludge reduction method.
Background technology
Along with the quickening of China's process of industrialization, urban rivers and lakes and reservoir water environmental quality worsen, and the body eutrophication problem is serious day by day.China had promulgated new " urban wastewater treatment firm pollutant emission standard " in 2002, had increased the highest permission emission concentration of total nitrogen.And the municipal sewage plant on the domestic existing great majority all can not realize the qualified discharge of total nitrogen, how to improve the traditional technology denitrification effect, is the active demand in present stage municipal sewage treatment field.And municipal effluent biological treatment denitrification process needs organism as carbon source, general requirement BOD/TKN〉4, but municipal effluent C/N is more on the low side than generally in China, can't satisfy the demand of denitrogenation, the carbon source deficiency becomes municipal sewage treatment total nitrogen key reason not up to standard, domestic existing urban sewage treatment system often comes the supplementary carbon source demand by adding outer carbon sources such as methyl alcohol, and this had both increased processing cost, has aggravated the CO of water factory again
2Discharging and mixing sludge output.
On the other hand, the mixing sludge output of urban sewage treatment system is big, processing cost is high, for a typical urban sewage treatment system, its sludge treatment cost accounts for 40% of total cost greatly, and the processing of mixing sludge disposes the secondary cause nutritive element easily and discharge, and causes secondary pollution, therefore, the mixing sludge output that how to reduce urban sewage treatment system also is an important topic.
Summary of the invention
Weak point at above-mentioned technology, the invention provides and a kind ofly can finish denitrification synchronously and to the fermentation of sewage sludge, the carbon source that is difficult to utilize in the former water of deep development and discharge the carbon source of mixing sludge in the aerating system, and realize preposition anaerobically fermenting synchronous denitrification sewage water denitrification collection mud decrement apparatus and method that the low consumption of nitrogen in the municipal effluent is removed with the combined action of nitrifier.
For achieving the above object, the invention provides a kind of preposition anaerobically fermenting synchronous denitrification sewage water denitrification collection mud decrement device, comprise former pond, storage basin, anaerobically fermenting synchronous denitrification reactor, the A/O nitrator, second pond and blowoff basin, described former pond is connected with described anaerobically fermenting synchronous denitrification reactor respectively with described storage basin, between described anaerobically fermenting synchronous denitrification reactor and described A/O nitrator, also be provided with intermediate pool, described anaerobically fermenting synchronous denitrification reactor is connected with described A/O nitrator by described intermediate pool, described A/O nitrator is connected with described second pond and blowoff basin successively, and described blowoff basin is connected with described anaerobically fermenting synchronous denitrification reactor.
Top and bottom at described anaerobically fermenting synchronous denitrification reactor is respectively arranged with triphase separator and water-distributing device, be provided with mud valve in described water-distributing device lower end, also be provided with the internal reflux pump on the described anaerobically fermenting synchronous denitrification reactor, described anaerobically fermenting synchronous denitrification reactor is connected with described intermediate pool by water shoot.
Described former pond and described storage basin are respectively by intake pump and advance dredge pump and be connected with described anaerobically fermenting synchronous denitrification reactor.
Described intermediate pool is connected with described A/O nitrator by the A/O intake pump.
Described second pond is connected with the importing end of described storage basin and described A/O nitrator by described A/O system's mud valve and mud reverse flow valve respectively.
Described blowoff basin is connected with described anaerobically fermenting synchronous denitrification reactor by the nitrification liquid reflux pump.
In addition, the present invention also provides a kind of method that realizes preposition anaerobically fermenting synchronous denitrification sewage water denitrification collection mud decrement device simultaneously, may further comprise the steps:
(1) open dredge pump, the mixing sludge in the storage basin is injected anaerobically fermenting synchronous denitrification reactor, mixing sludge is mixed in proportion by the second pond spoil disposal of sewage work and sludge digestion system spoil disposal and forms;
(2) open intake pump, municipal effluent is injected anaerobically fermenting synchronous denitrification reactor, treat all to fill it up with in the anaerobically fermenting synchronous denitrification reactor back and inject intermediate pool;
(3) mixed solution that municipal sewage plant's second pond spoil disposal is mixed with municipal effluent adds to A/O nitrator and second pond and handles, and the nitrification liquid after the processing is back in the anaerobically fermenting synchronous denitrification reactor by blowoff basin;
(4) open sludge reflux pump, A/O system mud valve and advance dredge pump, the mud that second pond is carried out after the mud-water separation is back in the storage basin, and by A/O system mud valve and mud reverse flow valve return sludge ratio is regulated;
(5) open A/O intake pump and mud reverse flow valve, after intermediate pool is filled with in the water outlet of anaerobically fermenting synchronous denitrification reactor, make the partial reflux mud after intermediate pool water outlet and second pond are handled inject the A/O nitrator;
(6) start the internal reflux ratio that progressively promotes the reflux ratio of nitrification liquid in the operational process and reduce anaerobically fermenting synchronous denitrification reactor.
In step (1), municipal sewage plant's second pond spoil disposal and sludge digestion system spoil disposal form by the mixed of 3:1, and the concentration of the postvaccinal mixing sludge of anaerobically fermenting synchronous denitrification reactor is 10g/L.
In step (2), after anaerobically fermenting synchronous denitrification reactor is filled it up with, promote the upflow velocity of anaerobically fermenting synchronous denitrification reactor by the internal reflux pump.
In step (3), the concentration of handling dissolved oxygen in the aerobic zone of back by aerating system and agitator is 0.3-1.0mg/L.
Compared with prior art, the present invention has the following advantages:
(1) takes full advantage of in the former water carbon source and carry out denitrification;
(2) big of former water COD is anaerobism removal, reduction aeration energy consumption;
(3) the mixing sludge output of reduction sewage disposal operation section;
(4) supply of former water carbon source can be created the co-substrate fermentation condition for anaerobically fermenting synchronous denitrification system, improves fermentation efficiency;
(5) under the condition that former water carbon source abundance or mixing sludge fermentation production rate are high, can spontaneous formation produce the methane system in the anaerobically fermenting synchronous denitrification reactor, reclaim carbon source to greatest extent.
Description of drawings
Fig. 1 is the structure iron of apparatus of the present invention part;
Fig. 2 is the schema of the inventive method part.
Main nomenclature is as follows:
The former pond of 1-2-anaerobically fermenting synchronous denitrification reactor
3-intermediate pool 4-storage basin 5-A/O nitrator
6-second pond 7-blowoff basin 2.1-intake pump
2.2-internal reflux pump 2.3-triphase separator 2.4-water-distributing device
2.5-advance dredge pump 2.6-nitrification liquid reflux pump 2.7-mud valve
2.8-water shoot 4.1-A/O system mud valve
5.1-A/O intake pump 5.2-whipping appts 5.3-air compressor machine
5.4-aeration plate 5.5-gas flow regulating valve
5.6-A/O rising pipe 5.7-mud reverse flow valve 6.1-sludge reflux pump
6.2-second pond rising pipe
Embodiment
Below in conjunction with drawings and Examples the present invention is described in further detail.
As shown in Figure 1, the invention provides a kind of preposition anaerobically fermenting synchronous denitrification sewage water denitrification collection mud decrement device, comprise former pond 1, storage basin 4, anaerobically fermenting synchronous denitrification reactor 2, A/O nitrator 5, second pond 6 and blowoff basin 7.Wherein, former pond 1 is connected with anaerobically fermenting synchronous denitrification reactor 2 respectively with storage basin 4, also be provided with intermediate pool 3 between anaerobically fermenting synchronous denitrification reactor 2 and A/O nitrator 5, anaerobically fermenting synchronous denitrification reactor 2 is connected with A/O nitrator 5 by intermediate pool 3.A/O nitrator 5 is connected with second pond 6 and blowoff basin 7 successively, and blowoff basin 7 is connected with anaerobically fermenting synchronous denitrification reactor 2.Top and bottom at anaerobically fermenting synchronous denitrification reactor 2 is respectively arranged with triphase separator 2.3 and water-distributing device 2.4, is provided with mud valve 2.7 in water-distributing device 2.4 lower ends.Also be provided with internal reflux pump 2.2 on anaerobically fermenting synchronous denitrification reactor 2, anaerobically fermenting synchronous denitrification reactor 2 is connected with intermediate pool 3 by water shoot 2.8.Former pond 1 and storage basin 4 are respectively by intake pump 2.1 and advance dredge pump 2.5 and be connected with anaerobically fermenting synchronous denitrification reactor 2.Intermediate pool 3 is connected with A/O nitrator 5 by A/O intake pump 5.1.Blowoff basin 7 is connected with anaerobically fermenting synchronous denitrification reactor 2 by nitrification liquid reflux pump 2.6.A/O nitrator 5 is the A/O reactor of no nitrification liquid internal reflux, be uncovered pond bodily form formula, the pond body is divided into some lattice chamber by dividing plate, each dividing plate upper edge water (flow) direction water flowing duct that is crisscross arranged up and down connects each lattice chamber, water (flow) direction front end lattice chamber is lattice chamber, oxygen-starved area, be provided with whipping appts 5.2, be aerobic zone lattice chamber thereafter, aeration plate 5.4 is all installed in each bottom, aerobic zone lattice chamber, aeration plate 5.4 links to each other with air compressor machine 5.3 by gas flow regulating valve 5.5, and A/O rising pipe 5.6 connects A/O nitrator 5 and second pond 6.The radical sedimentation basin of water inlet peripheral effluent in the middle of second pond 6 adopts, second pond 6 imports end by sludge reflux pump 6.1 and mud reverse flow valve 5.7 with A/O nitrator 5 and links to each other, be connected with storage basin 4 by sludge reflux pump 6.1 and A/O system mud valve 4.1 simultaneously, and be connected with blowoff basin 7 by second pond rising pipe 6.2.Nitrification liquid reflux pump 2.6 connects blowoff basin 7 and anaerobically fermenting synchronous denitrification reactor 2.
As shown in Figure 2, the present invention also provides a kind of method of using preposition anaerobically fermenting synchronous denitrification sewage water denitrification collection mud decrement device simultaneously, may further comprise the steps:
(1) open dredge pump, the mixing sludge in the storage basin is injected anaerobically fermenting synchronous denitrification reactor, mixing sludge is mixed in proportion by the second pond spoil disposal of sewage work and sludge digestion system spoil disposal and forms.In step (1), municipal sewage plant's second pond spoil disposal and sludge digestion system spoil disposal form by 3: 1 mixed, and the concentration of the postvaccinal mixing sludge of anaerobically fermenting synchronous denitrification reactor is 10g/L.
(2) open intake pump, municipal effluent is injected anaerobically fermenting synchronous denitrification reactor, treat all to fill it up with in the anaerobically fermenting synchronous denitrification reactor back and inject intermediate pool.In step (2), after anaerobically fermenting synchronous denitrification reactor is filled it up with, by the upflow velocity in the internal reflux pump lifting anaerobically fermenting synchronous denitrification reactor.
(3) mixed solution that municipal sewage plant's second pond spoil disposal is mixed with municipal effluent adds to A/O nitrator and second pond and handles, and the nitrification liquid after the processing is back in the anaerobically fermenting synchronous denitrification reactor by blowoff basin.The mixed solution that certain municipal sewage plant's second pond spoil disposal adopts municipal effluent to be made into about 2500-4000mg/L adds to A/O nitrator and second pond, unlatching whipping appts, air compressor machine, gas flow regulating valve make that aerobic zone dissolved oxygen concentration DO is 0.3-1.0mg/L, open the A/O intake pump, after treating that the water outlet of A/O nitrator is full of blowoff basin, open the nitrification liquid reflux pump and start the nitrification liquid backflow, control nitrification liquid reflux ratio is 200-400%;
(4) open sludge reflux pump, A/O system mud valve and advance dredge pump, the mud that second pond is carried out after the mud-water separation is back in the storage basin, and by A/O system mud valve and mud reverse flow valve return sludge ratio is regulated.Return sludge ratio is 50-100% after regulating, the SRT of A/O nitrator is 10-20 days, regularly opens the mud valve of anaerobically fermenting synchronous denitrification reactor, and the SRT that regulates anaerobically fermenting synchronous denitrification reactor is 40-60 days.
(5) open A/O intake pump and mud reverse flow valve, after intermediate pool is filled with in the water outlet of anaerobically fermenting synchronous denitrification reactor, make the partial reflux mud after intermediate pool water outlet and second pond are handled inject the A/O nitrator;
(6) start the internal reflux ratio that progressively promotes the reflux ratio of nitrification liquid in the operational process and reduce anaerobically fermenting synchronous denitrification reactor.
The initial 1.0mg/L that maintains of A/O nitrator aerobic zone lattice chamber concentration then according to the variation adjustment of A/O nitrator water outlet ammonia nitrogen concentration, strengthens aeration rate when the water outlet ammonia nitrogen concentration is higher than 1mg/L, reduce aeration rate during less than 1mg/L.
The nitrification liquid reflux ratio is initially 100%, and is stable and during less than 1mg/L when anaerobically fermenting synchronous denitrification reactor water outlet nitrous oxides concentration, progressively promotes reflux ratio to certain value; When adjusting the nitrification liquid reflux ratio, the internal reflux ratio of synchronization control anaerobically fermenting synchronous denitrification reactor, both are in conjunction with not only reaching the purpose that promotes upflow velocity but also avoid excessive turbulence to cause efficient to reduce.
The adjustment strategy of SRT in the anaerobically fermenting synchronous denitrification reactor: under fixing nitrification liquid reflux ratio condition, according to total nitrogen content adjustment in the total water outlet of system, namely when total nitrogen water outlet during greater than 15mg/L, reduce its SRT, and can be stabilized in 10mg/L when following when the total water outlet total nitrogen of system, can promote its SRT, further reduce system's mixing sludge output.
Concrete experiment case is as follows:
Concrete experimental water is certain university dependents' district discharging real life sewage (pH=6.9-7.8, SCOD=140-220mg/L, TCOD=180-270mg/L, NH
4 +-N=60-80mg/L, NO
2 --N and NO
3 --N is all below detectability), used anaerobically fermenting synchronous denitrification reactor useful volume 3.5L, hydraulic detention time is 1.75h, A/O reactor useful volume is 9L, be divided into lattice chambers 9, first lattice are the anoxia stirring district, and all the other are aerobic zone, each lattice chamber is connected by the water flowing duct that interlocks up and down that is arranged on along water (flow) direction on each dividing plate, and its hydraulic detention time is 4.5h.Concrete operation process is as follows:
(1) seed sludge of anaerobically fermenting synchronous denitrification reactor is formed by certain municipal sewage plant's second pond spoil disposal and the sludge digestion system spoil disposal mixed by 3: 1, and inoculation back sludge concentration maintains about 10g/L;
(2) municipal effluent is added former pond, opens intake pump, municipal effluent is injected anaerobically fermenting synchronous denitrification reactor, treat whole the filling it up with in the anaerobically fermenting synchronous denitrification reactor after, open the internal reflux pump to promote upflow velocity;
(3) mixed solution that adopts municipal effluent to be made into about 3000mg/L municipal sewage plant's second pond spoil disposal adds to the A/O nitrator, unlatching whipping appts, air compressor machine, gas flow regulating valve make that aerobic zone dissolved oxygen concentration DO is 0.5mg/L, open the A/O intake pump, after treating that the water outlet of A/O nitrator is full of blowoff basin, open the nitrification liquid reflux pump and start the nitrification liquid backflow, control nitrification liquid reflux ratio is 200-400%; Start sludge reflux pump and mud reverse flow valve, treat that the second pond water outlet is full of blowoff basin after, open the nitrification liquid reflux pump and start nitrification liquid and reflux, control nitrification liquid reflux ratio is 200%;
(4) open A/O system's mud valve and advance dredge pump, the mud that second pond is carried out after the mud-water separation is back in the storage basin, adjusting by A/O system mud valve and mud reverse flow valve, the control return sludge ratio is 50%, the SRT of A/O nitrator is 15 days, regularly open anaerobically fermenting synchronous denitrification reactor mud valve, the SRT that regulates anaerobically fermenting synchronous denitrification reactor is 40 days;
(5) open A/O intake pump and mud reverse flow valve, after intermediate pool is filled with in the water outlet of anaerobically fermenting synchronous denitrification reactor, make the partial reflux mud after intermediate pool water outlet and second pond are handled inject the A/O nitrator;
(6) start the internal reflux ratio that progressively promotes the reflux ratio of nitrification liquid in the operational process and reduce anaerobically fermenting synchronous denitrification reactor.In starting operational process, progressively promote nitrification liquid reflux ratio to 300%, anaerobically fermenting synchronous denitrification reactor internal reflux is adjusted to 300%, A/O aerobic section DO concentration is 0.7-1.0mg/L, A/O reactor SRT20d, anaerobically fermenting synchronous denitrification reactor SRT50d, steady running.
Utilize the present invention to handle city domestic sewage, final outflow water ammonia nitrogen concentration＜1mg/L, TN concentration between 5-10mg/L, water outlet COD＜40mg/L, average system mixing sludge output reduces about 38% on year-on-year basis.
Know-why of the present invention is as follows:
Municipal effluent at first enters anaerobically fermenting synchronous denitrification reactor operation, COD in the former water and mixing sludge tunning provide carbon source for denitrification, the ammonia nitrogen that the fermentation of former water and mixing sludge produces enters follow-up A/O nitrator and carries out nitratedly, and nitrification liquid is back to anaerobically fermenting synchronous denitrification reactor again and carries out denitrogenation; The mixing sludge that A/O nitration reaction system produces directly enters the decrement treatment of fermenting in the anaerobically fermenting synchronous denitrification reactor, thereby finishes the integrated of sludge fermentation operation and sewage disposal operation.Present technique can take full advantage of the optimum carbon source in the former water, efficiently develops the granule type carbon source in the former water, and the degree of depth discharges the mixing sludge internal carbon source, and reaches the purpose of system sludge decrement.
The above only is preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (3)
1. preposition anaerobically fermenting synchronous denitrification sewage water denitrification collection sludge reduction method, this method is finished in preposition anaerobically fermenting synchronous denitrification sewage water denitrification collection mud decrement device, this device comprises former pond, storage basin, anaerobically fermenting synchronous denitrification reactor, the A/O nitrator, second pond and blowoff basin, in the described A/O nitrator aerating system and agitator are installed, its described former pond is connected with described anaerobically fermenting synchronous denitrification reactor respectively with described storage basin, between described anaerobically fermenting synchronous denitrification reactor and described A/O nitrator, also be provided with intermediate pool, described anaerobically fermenting synchronous denitrification reactor is connected with described A/O nitrator by described intermediate pool, described A/O nitrator is connected with described second pond and blowoff basin successively, described blowoff basin is connected with described anaerobically fermenting synchronous denitrification reactor, the top of described anaerobically fermenting synchronous denitrification reactor is provided with triphase separator, the bottom is provided with water-distributing device, described water-distributing device lower end is provided with mud valve, also be provided with the internal reflux pump on the described anaerobically fermenting synchronous denitrification reactor, described anaerobically fermenting synchronous denitrification reactor is connected with described intermediate pool by water shoot, described former pond and described storage basin are respectively by intake pump and advance dredge pump and be connected with described anaerobically fermenting synchronous denitrification reactor, described intermediate pool is connected with described A/O nitrator by the A/O intake pump, described second pond is connected with the importing end of described storage basin and described A/O nitrator respectively by A/O system mud valve and mud reverse flow valve respectively, described blowoff basin is connected with described anaerobically fermenting synchronous denitrification reactor by the nitrification liquid reflux pump, and above-mentioned preposition anaerobically fermenting synchronous denitrification sewage water denitrification collection sludge reduction method may further comprise the steps:
(1) open dredge pump, the mixing sludge in the storage basin is injected anaerobically fermenting synchronous denitrification reactor, mixing sludge is mixed in proportion by the second pond spoil disposal of sewage work and sludge digestion system spoil disposal and forms;
(2) open intake pump, municipal effluent is injected anaerobically fermenting synchronous denitrification reactor, treat that intermediate pool is injected in the whole backs of filling it up with in the anaerobically fermenting synchronous denitrification reactor;
(3) municipal sewage plant's second pond spoil disposal is mixed with municipal effluent, the mixed solution of the two adds to A/O nitrator and second pond and handles, and the nitrification liquid after the processing is back in the anaerobically fermenting synchronous denitrification reactor by blowoff basin;
(4) open sludge reflux pump, A/O system mud valve and advance dredge pump, the mud that second pond is carried out after the mud-water separation is back in the storage basin, and by A/O system mud valve and mud reverse flow valve return sludge ratio is regulated;
(5) open A/O intake pump and mud reverse flow valve, after intermediate pool is filled with in the water outlet of anaerobically fermenting synchronous denitrification reactor, make the partial reflux mud after intermediate pool water outlet and second pond are handled inject the A/O nitrator;
(6) start the internal reflux ratio that progressively promotes the reflux ratio of nitrification liquid in the operational process and reduce anaerobically fermenting synchronous denitrification reactor.
2. according to the described method of claim 1, it is characterized in that, in step (1), municipal sewage plant's second pond spoil disposal and sludge digestion system spoil disposal form by the mixed of 3:1, and the concentration of the postvaccinal mixing sludge of anaerobically fermenting synchronous denitrification reactor is 10g/L.
3. according to the described method of claim 1, it is characterized in that, in step (3), handle the concentration 0.3-1.0mg/L of dissolved oxygen in the A/O nitrator of back by aerating system and agitator.
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| CN1887740A (en) * | 2006-08-04 | 2007-01-03 | 北京工业大学 | Short-path deep biological denitrogenation method for city garbage percolate |
| CN101003405A (en) * | 2007-01-19 | 2007-07-25 | 北京工业大学 | Denitrified biological denitrificaion equipment of intensified internal source, and method |
| CN202322556U (en) * | 2011-11-04 | 2012-07-11 | 北京工业大学 | Prepositive anaerobic fermentation, synchronous denitrification sewage-denitrifying sludge-collecting reduction device |
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| CN1887740A (en) * | 2006-08-04 | 2007-01-03 | 北京工业大学 | Short-path deep biological denitrogenation method for city garbage percolate |
| CN101003405A (en) * | 2007-01-19 | 2007-07-25 | 北京工业大学 | Denitrified biological denitrificaion equipment of intensified internal source, and method |
| CN202322556U (en) * | 2011-11-04 | 2012-07-11 | 北京工业大学 | Prepositive anaerobic fermentation, synchronous denitrification sewage-denitrifying sludge-collecting reduction device |
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