CN102001787B - Anaerobic microporous aerator oxidation ditch reactor and sewage treatment method - Google Patents
Anaerobic microporous aerator oxidation ditch reactor and sewage treatment method Download PDFInfo
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- CN102001787B CN102001787B CN 201010527386 CN201010527386A CN102001787B CN 102001787 B CN102001787 B CN 102001787B CN 201010527386 CN201010527386 CN 201010527386 CN 201010527386 A CN201010527386 A CN 201010527386A CN 102001787 B CN102001787 B CN 102001787B
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Abstract
The invention discloses an anaerobic microporous aerator oxidation ditch reactor and a sewage treatment method. The reactor comprises a plurality of treatment zones which are adjacent to and communicated with one another hydraulically, wherein the treatment zones comprise a hydrolysis zone, an anaerobic zone, an anoxic zone, an aerobic zone and a settling zone. Supernate return channels are formed between the settling zone and the hydrolysis zone for returning nitrate-containing supernate from the settling zone to the hydrolysis zone, and denitrification treatment is performed by using the action of denitrifying bacteria. The reactor integrates hydrolysis, anaerobic treatment, anoxic treatment, aerobic treatment and settling, thereby greatly saving floor area and reducing investment cost of infrastructure construction. The adopted internal and external return systems improve the utilization rate of the capacity of a pool, increase denitriding and dephosphorizing effects and reduce treatment cost.
Description
Technical field
The present invention relates to a kind of facility and method that city domestic sewage is handled that be used for, particularly a kind ofly be used to satisfy the anaerobism microporous aerated oxidation ditch reactor drum of advanced nitrogen dephosphorization requirement and use the method that this reactor drum carries out WWT.
Background technology
In order to protect water surrounding, reduce and pollute, China has strengthened the construction dynamics to the municipal sewage plant in recent years.The technology that is suitable for municipal sewage treatment at present has Activated Sludge Process, SBR method and mainstream technologys such as mutation technology, oxidation ditch process thereof.Yet municipal sewage treatment also is one of high energy consumption industry, and high energy consumption has caused the sewage treatment facility operation cost high, is to cause one of major reason that sewage work can not normally move.Therefore, the problem of solution is needed in the energy-saving and cost-reducing normal operation that has become the guarantee municipal sewage plant of WWT badly.
Oxidation ditch since 50 years 20th century came out because it is simple in structure, operation is easy and the stable treated effect and all over the world by broad research and application, and constantly have novel oxidation ditch to emerge in large numbers.In recent years, the application of oxidation ditch process aspect China's municipal sewage treatment is quite general.Adopted existing 154 families of Sewage Plant of oxidation ditch in 2006, near 1/3rd of existing municipal sewage plant.
Common oxidation ditch type comprises Carrousel (Carrouse) oxidation ditch, two ditch or three ditch alternative expression oxidation ditches, opel (Orbal) oxidation ditch and Paasche Wei Er (Pasveer) oxidation ditch etc. at present.These oxidation ditches mostly be exposed to ground and ringwise or the irrigation canals and ditches of bar loop constitute its main body reactive moieties, and possess oxidation and precipitation process ability.
These existing oxidation ditches utilize surface aeration equipment oxygen supply and promotion current to advance usually, and the characteristics of these equipment are that installation and maintenance are simple, and are easy to use.But the problem of its existence is exactly the service rating height of the equipment that is equipped with, and the energy consumption of folk prescription water treatment is high, and this oxygen supply mode energy consumption is generally at 15～25w/m
3The aeration effect of these equipment also can only involve the distance of 1-2 rice under water simultaneously; They mix oxygen supply through changeing equipment such as brush, plate-spinning with the mixed solution top section; And then drive underclad portion mixing oxygen supply, so the pond of these oxidation ditch process is little deeply usually.
In addition, the operation characteristic of oxidation ditch is underload, long sludge age, so treatment effect is stable, effluent quality is good, and can reach higher nitrogen removal rate.Yet from the principle of biological carbon and phosphorous removal, long sludge age helps the growth of nitrifier, can obtain high nitric efficiency; But biological phosphate-eliminating is the discharging through excess sludge removes phosphorus from system, therefore long sludge age is the major reason that causes biological phosphate-eliminating efficient not high.Although increased anaerobic reactor in some oxidation ditch process at present, the raising of dephosphorization efficiency by using need be shortened sludge age usually.Along with the shortening of sludge age, the original advantage of oxidation ditch is weakened.Therefore, on the basis that keeps the oxidation ditch characteristics, improving the denitrogenation dephosphorizing effect is technological difficulties.
So these existing oxidation ditches itself have some shortcoming, the one, the energy that oxidation ditch is consumed when carrying out oxygen supply is higher with the ratio of organism volume load; The 2nd, floor space is bigger, mainly be limited by the efficiency of oxygen supply of surface aeration equipment low, need reasons such as bigger impellent and ditch depth are more shallow; The 3rd, the denitrogenation dephosphorizing poor effect is difficult to satisfy the requirement of municipal effluent industry advanced nitrogen dephosphorization.
Because oxidation Ditch Technology is shorter in the time of China's large-scale application; Be to introduce and duplicate mostly; Lacking systematic research and summary, and how to reduce the energy consumption and raising denitrogenation dephosphorizing efficient of oxidation ditch, is to guarantee oxidation ditch system steady running and continue development key.
Summary of the invention
Deficiency to above-mentioned prior art; The purpose of this invention is to provide and a kind ofly can satisfy anaerobism microporous aerated oxidation ditch reactor drum and the sewage water treatment method that denitrogenation dephosphorizing that the municipal sewage treatment industry improves day by day requires; High to solve the ubiquitous denitrification dephosphorization technique investment of present oxidation ditch process; Problems such as working cost height, the energy consumption of WWT in the reduction oxidation ditch process improves technology denitrogenation dephosphorizing efficient.
Be to realize above-mentioned purpose, one of technical scheme of the present invention is: a kind of anaerobism microporous aerated oxidation ditch reactor drum, this reactor drum comprise and adjoining each other and a plurality of treatment zones of hydraulic communication each other that said a plurality of treatment zones comprise:
Hydrolysis area; Pending sewage is introduced this hydrolysis area; And through stopping wherein acidication bacterium and denitrifying bacteria be hydrolyzed acidification and adverse effect denitrogenation; With removal COD, BOD, ss suspended solid and total nitrogen index, and the hardly degraded organic substance in the sewage is converted into easy by biodegradable organism;
Anaerobic zone is introduced this anaerobic zone with the sewage after hydrolysis treatment from this hydrolysis area, and is carried out anaerobic treatment through the anerobes that stops wherein, from sewage, discharges phosphorus;
The oxygen-starved area is introduced this oxygen-starved area with the sewage after anaerobic treatment from this anaerobic zone, and carries out anoxic denitrification processing, denitrogenation from sewage through the amphimicrobe that stops wherein;
Aerobic zone is introduced this aerobic zone with the sewage after anaerobic treatment from this oxygen-starved area, and through the oxygen supply mode sewage is removed organic carbon source, nitration treatment and aerobic suction phosphorus; And
The settling region is introduced this settling region with the muddy water mixed solution of handling well from this aerobic zone, carries out mud-water separation, carries out mud discharging and the discharging of handling the back clear water then; Wherein
Between this settling region and this hydrolysis area, be provided with the supernatant return flow line, make the supernatant that contains nitrate salt of discharging in this settling region be back in this hydrolysis area, and utilize denitrifying bacteria to carry out denitrification and handle and remove nitrogenous source.
According to one embodiment of present invention; Wherein, Between this settling region and this anaerobic zone, also be provided with the mud return flow line, make the part mud of in this aerobic zone, handling be back to and continue to participate in anaerobic treatment this anaerobic zone from this settling region through organic carbon source removal, nitration treatment and suction phosphorus.
According to one embodiment of present invention, wherein, between this aerobic zone and this oxygen-starved area, also be provided with the mixed-liquor return passage, make muddy water mixed solution that part in this aerobic zone contains nitrate salt be back to continue to participate in anoxic denitrification in this oxygen-starved area and handle.
For realizing above-mentioned purpose, one of technical scheme of the present invention is: a kind of sewage water treatment method, and it is used aforesaid any one anaerobism microporous aerated oxidation ditch reactor drum and carries out WWT, and this method may further comprise the steps:
Pending sewage is introduced hydrolysis area; And through stopping wherein acidication bacterium and denitrifying bacteria be hydrolyzed acidification and adverse effect denitrogenation; With removal COD, BOD, ss suspended solid and total nitrogen index, and the hardly degraded organic substance in the sewage is converted into easy by biodegradable organism;
Sewage after hydrolysis treatment is introduced this anaerobic zone from this hydrolysis area, and carry out the releases phosphorus element processing of sewage through the anerobes that stops wherein;
Sewage after anaerobic treatment is introduced this oxygen-starved area from this anaerobic zone, and carry out the denitrification denitrogenation processing of sewage through the amphimicrobe that stops wherein;
Sewage after anaerobic treatment is introduced this aerobic zone from this oxygen-starved area, and through the oxygen supply mode sewage is carried out organic carbon source removal, nitration treatment and suction phosphorus and handle; And
The muddy water mixed solution of handling well is introduced this settling region from this aerobic zone, carry out mud-water separation, carry out mud discharging and the discharging of handling the back clear water then; Wherein
When discharging supernatant from this settling region, the part supernatant is carried out supernatant from this settling region to this hydrolysis area reflux, make the supernatant that part contains nitrate salt be back in this hydrolysis area, and handle and remove nitrogenous source through utilizing denitrifying bacteria to carry out denitrification.
The invention has the beneficial effects as follows, this bio-reactor catchment separate, anaerobism, anoxic, aerobic and settling system be in one, saved floor space greatly, reduced the investment capital cost.The internal reflux system that is adopted has improved utilization rate of tank volume, has strengthened the effect of denitrogenation dephosphorizing, has reduced processing costs.The stability of operation and safety increase, and effluent quality can reach national grade one discharge standard.Integrated, the blocking of structures, extensibility is stronger.
Particularly, the present invention has the following advantages:
1) anaerobism microporous aerated oxidation ditch reactor drum of the present invention adopts the anaerobic-aerobic combinatorial principle, gives full play to the pretreated advantage of the anaerobism that does not need energy consumption, and reduces the organic loading of oxidation ditch with this, thereby reach the target that reduces the entire treatment system energy consumption.
Anaerobism microporous aerated oxidation ditch reactor drum of the present invention has been set up the supernatant return flow line between settling region and hydrolysis area; The supernatant that contains nitrate salt of discharging in the settling region is back in this hydrolysis area, and handles and realize removing more fully nitrogenous source through utilizing denitrifying bacteria to carry out denitrification.Make full use of the anaerobic hydrolysis effect of hydrolysis area, make it not only have effect, have the not available effect that removes nitrogenous source of existing independent hydrolytic tank technology simultaneously the carbon source organic matter degradation.
2) anaerobism microporous aerated oxidation ditch reactor drum of the present invention has been integrated the microporous aeration device in the traditional activated sludge process in aerobic zone (being oxidation ditch), has improved the utilising efficiency of dissolved oxygen in the aerobic zone greatly.Utilize the underwater propeller that is arranged on these microporous aeration device downstream to replace the commentaries on classics brush and the plate-spinning device of conventional oxidation ditch simultaneously; Under the prerequisite that does not reduce horizontal flow velocity; Greatly reduce the power consumption of promotion, and help to improve the efficiency of oxygen supply of microporous aeration device.
3) because the aeration ununiformity of aerating apparatus almost is inevitable; So; Even the wind supply quantity that has adopted meet the specifications to require; The body part still can form the dead angle in the pond, and the circulation plug-flow form by means of underwater propeller of the present invention then can form good waterpower fluidised form, effectively avoids the generation of analogue.Therefore, behind the increase transverse flow speed, help improving the utilization ratio that the pond holds.
Description of drawings
Fig. 1 representes the structural representation according to the anaerobism microporous aerated oxidation ditch reactor drum of the embodiment of the invention
Wherein, description of reference numerals is following:
1～hydrolysis area, 2～anaerobic zone, 3～oxygen-starved area, 4～aerobic zone, 5～settling region; 6～mud storage pool, 7-10～communicating aperture, 11-13～effluent weir, 14～mixed-liquor return pump, 15～sludge reflux pump; 16～mud discharging pump, 17-19～underwater propeller, 20～microporous aeration device, 21～wet well, 22～supernatant reflux pump; 23～water inlet pipe, 24～sludge bucket, 25～rising pipe, 26～distributing flue; R1～supernatant return flow line, R2～mud return flow line, R3～mixed-liquor return passage, W1-W4～reactor drum outer wall.
Embodiment
Below in conjunction with accompanying drawing and instance the present invention is done further explanation.
Fig. 1 representes the structural representation according to the anaerobism microporous aerated oxidation ditch reactor drum of the embodiment of the invention.
As shown in Figure 1, the anaerobism microporous aerated oxidation ditch reactor drum of this enforcement comprises and adjoining each other and a plurality of treatment zones of hydraulic communication each other.Said a plurality of treatment zone comprises hydrolysis area 1, anaerobic zone 2, oxygen-starved area 3, aerobic zone 4, settling region 5 and mud storage pool 6.With above-mentioned a plurality of treatment zone reasonable disposition, make it constitute one and be similar to reactor drum overall area rectangular, that surround by reactor drum outer wall W1-W4.In the present embodiment; Reactor drum outer wall W1 near anaerobic zone 2 and oxygen-starved area 3 is a upper outer wall; Near the reactor drum outer wall W3 of settling region 5 are below outer walls, are right-hand outer walls near the reactor drum outer wall W4 of hydrolysis area 1, are the left outer walls away from the reactor drum outer wall W3 of hydrolysis area 1.
Hydrolysis area 1 is used for pending sewage is introduced this hydrolysis area 1; And through stopping wherein acidication bacterium and denitrifying bacteria be hydrolyzed acidification and adverse effect denitrogenation; With removal COD, BOD, ss suspended solid and total nitrogen index, and the hardly degraded organic substance in the sewage is converted into easy by biodegradable organism.
Anaerobic zone 2 is used for the sewage after hydrolysis treatment is introduced this anaerobic zone 2 from this hydrolysis area 1, and carries out anaerobic treatment through the anerobes that stops wherein, from sewage, discharges phosphorus.
Oxygen-starved area 3 is used for the sewage after anaerobic treatment is introduced this oxygen-starved area 3 from this anaerobic zone 2, and carries out anoxic denitrification processing, denitrogenation from sewage through the amphimicrobe that stops wherein.
Aerobic zone 4 is used for the sewage after anaerobic treatment is introduced this aerobic zone 4 from this oxygen-starved area 3, and through the oxygen supply mode sewage is carried out carbonization and nitration treatment.
Settling region 5 is used for the muddy water mixed solution of handling well is introduced this settling region 5 from this aerobic zone 4, carries out mud-water separation, carries out mud discharging and the discharging of handling the back clear water then.
Between this settling region 5 and this hydrolysis area 1, be provided with supernatant return flow line R1, make the supernatant that contains nitrate salt of discharging in this settling region 5 be back in this hydrolysis area 1, and utilize denitrifying bacteria to carry out denitrification and handle and remove nitrogenous source.
Between this settling region 5 and this anaerobic zone 2, also be provided with mud return flow line R2, make that the part mud through carbonization and nitration treatment is back to this anaerobic zone 2 from this settling region 5 in this aerobic zone 4, keep enough microbial biomasss to continue to participate in anaerobic treatment.
Between this aerobic zone 4 and this oxygen-starved area 3, also be provided with mixed-liquor return passage R3, make muddy water mixed solution that part in this aerobic zone 4 contains nitrate salt be back to continue to participate in anoxic denitrification in this oxygen-starved area 3 and handle.
Wherein, this aerobic zone 4 forms dual U-shaped circulation irrigation canals and ditches by four long strip shape raceway grooves side by side, is provided for the microporous aeration device 20 to the mikrobe oxygen supply at the middle part of every long strip shape raceway groove.Downstream next-door neighbour being arranged at every microporous aeration device 20 in the long strip shape raceway groove is provided with in order to promote the underwater propeller 19 that muddy water mixed solution circulates.
In this aerobic zone 4, also comprise: mixed-liquor return pump 14, in this mixed-liquor return passage R3, the part muddy water mixed solution in this aerobic zone 4 is back in this oxygen-starved area 3, this mixed-liquor return pump 14 is arranged near 3 places, this oxygen-starved area; Communicating aperture 10 is used for being communicated with this settling region 5, and this communicating aperture 10 is arranged on the partition wall between this aerobic zone 4 and this settling region 5, and is as shown in Figure 1, and this communicating aperture 10 specifically is arranged on this partition wall near its low order end position, promptly near distributing flue 26 places; And effluent weir 12, being used for the muddy water mixed solution after the collection and treatment, this effluent weir 12 is arranged near this communicating aperture 10 places, and collected supernatant is flowed into next treatment zone through this communicating aperture 10.
Wherein, this hydrolysis area 1 rectangular shaped comprises in this hydrolysis area 1: water inlet pipe 23, be used for treatment sewage is introduced this hydrolysis area 1, and this water inlet pipe 23 is communicated with outside sewage running piping; Communicating aperture 7 is used for being communicated with this anaerobic zone 2, and this communicating aperture 7 is arranged in this hydrolysis area 1 and on the partition wall between this anaerobic zone 2, and is as shown in Figure 1, and this communicating aperture 7 specifically is arranged on this partition wall near its uppermost position place, promptly near the outer wall W1 place of reactor drum; And effluent weir 11, being used to collect supernatant, this effluent weir 11 is arranged near this communicating aperture 7 places, and collected supernatant is flowed into next treatment zone through this communicating aperture 7.
Wherein, this anaerobic zone 2 forms the circulation irrigation canals and ditches by two long strip shape raceway grooves side by side, is provided with at the middle part of every long strip shape raceway groove in order to promote the underwater propeller 17 that muddy water mixed solution circulates.
In this anaerobic zone 2, comprise communicating aperture 8, be used for being communicated with this oxygen-starved area 3 that this communicating aperture 8 is arranged on the partition wall between this anaerobic zone 2 and this oxygen-starved area 3, and is as shown in Figure 1, this communicating aperture 8 specifically is arranged on this partition wall near the position, center.
Wherein, this oxygen-starved area 3 forms the circulation irrigation canals and ditches by two long strip shape raceway grooves side by side, is provided with at the middle part of every long strip shape raceway groove in order to promote the underwater propeller 18 that muddy water mixed solution circulates.
In this oxygen-starved area 3, also comprise communicating aperture 9; Be used for being communicated with this aerobic zone 4, this communicating aperture 9 is arranged on the partition wall between this oxygen-starved area 3 and this aerobic zone 4, and is as shown in Figure 1; This communicating aperture 9 specifically is arranged on this partition wall near its high order end position, promptly near the outer wall W2 place of reactor drum.
Wherein, this settling region 5 is formed by rectangular channel, in this settling region 5, comprises: distributing flue 26, be used for introducing this settling region 5 evenly distributedly from these aerobic zone 4 effusive muddy water mixed solutions of handling well, and this distributing flue 26 is arranged on the upstream extremity of this settling region 5; Sludge bucket 24 is used for this settling region 5 sedimentary mud are collected, and this sludge bucket 24 is arranged near this distributing flue 26; Effluent weir 13 is used to collect supernatant and discharge, and this effluent weir 13 is arranged on the downstream end of this settling region 5.
In addition, mud storage pool 6 is used for that the mud of this settling region 5 post precipitations is introduced this mud storage pool 6 and also stores wherein, and this mud storage pool 6 is arranged between this settling region 5 and this hydrolysis area 1.
In this mud storage pool 6, comprise: sludge reflux pump 15 is back to active sludge this anaerobic zone 2 from this settling region 5 in the R2 of mud return flow line; And mud discharging pump 16, be used for the excess sludge that contains phosphoric is discharged from this mud storage pool 6.
In the present embodiment, said anaerobism microporous aerated oxidation ditch reactor drum also comprises wet well 21, is used for the supernatant that the effluent weir 13 of this settling region 5 is discharged is introduced wherein, and this wet well 21 is arranged between this settling region 5 and this aerobic zone 4.
In this wet well 21, comprise: supernatant reflux pump 22, the part supernatant of in the R1 of supernatant return flow line, this effluent weir 13 being discharged is back in this hydrolysis area 1; And rising pipe 25, the supernatant that is used for that this effluent weir 13 is discharged is discharged outside this reactor drum, and the clear water transport pipe is communicated with after this rising pipe 25 and the external treatment.
Specifically describe the method for using anaerobism microporous aerated oxidation ditch reactor drum of the present invention to carry out WWT below.
This method may further comprise the steps:
At first, pending sewage gets into settling pit after grid pump well pump house, lifting, flow into anaerobism microporous aerated oxidation ditch reactor drum of the present invention certainly, handles back up to standard discharging at last.
Pending sewage at first gets into the hydrolysis area 1 of front end via water inlet pipe 23; The active sludge that contains the acidication bacterium in this hydrolysis area 1 stop; It all has certain removal effect to organic carbon source, ss suspended solid; Simultaneously can the organism of difficult degradation be converted into the readily biodegradable organic matter, improve the efficient of follow-up aerobic treatment.This hydrolysis area 1 also has the peculiar function of the present invention; The autoprecipitation district 5 terminal supernatants that contain nitrate salt are back to this district and accomplish the supernatant backflow in the future exactly; Handle through utilizing denitrifying bacteria to carry out denitrification, can further improve denitrification effect sewage.
Sewage is handled in hydrolysis area 1 after get in the anaerobic zone 2 active sludge that contains anerobes that in this anaerobic zone 2, stops by effluent weir 11 and communicating aperture 7.Circulation irrigation canals and ditches both sides at this anaerobic zone 2 respectively are equipped with underwater propeller 17, are responsible for promoting muddy water mixed solution and in annular irrigation canals and ditches, run up, and bacterium and organism are able to thorough mixing.Dephosphorization through utilizing anerobes to carry out sewage is handled, and the phosphorus in the sewage is released.
Then sewage is via in the communicating aperture 8 entering oxygen-starved areas 3, and in this oxygen-starved area 3, stopping has the active sludge that contains amphimicrobe.Circulation irrigation canals and ditches both sides in this oxygen-starved area 3 are equipped with underwater propeller 18 equally, are responsible for promoting muddy water mixed solution and in annular irrigation canals and ditches, run up, and bacterium and organism are able to thorough mixing.Carry out the denitrogenation processing of sewage through the denitrification that utilizes amphimicrobe.Nitrogenous source in the sewage is able to remove.
In this oxygen-starved area 3, through will be wherein, utilize in the mixed solution that refluxes contained nitrate salt further to carry out denitrification and handle, thereby realize further denitrogenation from the mixed-liquor return of aerobic zone 4.
Sewage has got in the aerobic zone 4 via communicating aperture 9 then; This district forms dual U-shaped circulation irrigation canals and ditches by four rectangular raceway grooves; Muddy water mixed solution flows in irrigation canals and ditches with the speed that is not less than 0.3m/s under the promotion of thruster 19 under water; Simultaneously whenever be provided with microporous aeration device 20, be responsible for giving the aerobic microbiological oxygen supply that stops wherein at a distance from a segment distance; This aerobic zone 4 is carrying out organic carbon source simultaneously and is removing and nitrated effect under action of microorganisms.
Be provided with mixed-liquor return pump 14 at aerobic zone 4 near 3 places, oxygen-starved area, be used to carry out above-mentioned mixed-liquor return.
Sewage is degraded in aerobic zone 4 to the emission standard of national requirements; The muddy water mixed solution of handling well is finally via the distributing flue 26 of effluent weir 12 and communicating aperture 10 entering settling regions 5; Get into the mud-water separation of carrying out of settling region 5 then; The mud of post precipitation is scraped the mud of pond bottom sediments in the sludge bucket 24 with the mud scraper that is arranged on settling tank 5 end faces, and then enters in the mud storage pool 6.
Supernatant after the mud-water separation is then collected and is expelled in the wet well 21 through being arranged on settling region 5 terminal effluent weirs 13; The part supernatant is back to completion supernatant backflow in this hydrolysis area 1 through the supernatant reflux pump 22 that is arranged in this wet well 21, and remaining supernatant is discharged through rising pipe 25 as water outlet up to standard.
In this mud storage pool 6, the part active sludge is back to completion mud backflow in the anaerobic zone 2 through the sludge reflux pump 15 that is arranged in this mud storage pool 6, and remaining simultaneously mud is disposed to outside this reactor drum via sludge pump 16.
The present invention improves from following three aspects:
1) utilize anaerobism one aerobic combinatorial principle, give full play to the pretreated advantage of anaerobic hydrolysis of no energy consumption, reduce the organic loading of oxidation ditch simultaneously, enhanced system denitrification denitrogenation effect, and then reach the target of the energy consumption of reduction system.
The mechanism of action of hydrolysis area 1 mainly comprises the following aspects:
A. the acidication bacterium is small organic molecules such as formic acid, acetate with the organic matter degradation in the waste water, is prone to improved denitrifying speed and utilization of carbon source efficient by the denitrifying bacteria utilization.
B. acidication process and denitrification process carry out in same hydrolysis area, thereby obtain the promoted each other effect of associated treatment.Acidication is that denitrification provides efficient carbon source, and denitrification can quicken the generation that acidication reacts again to the consumption of acidication product, reduce product and suppress, thereby the utilization of the acidization of making, carbon source is all more abundant.
C. denitrifying bacteria can remain on lower level with its concentration to the utilization timely and effectively of acidizing product, has reduced absorption, absorption and the biological metabolism utilization of other mikrobes to acidizing product.
D. nitrification liquid refluxes and to have changed the redox potential of hydrolysis area, possibly suppress to a certain extent methanobacteria (best ORP-200～-400mv) growth.
E. the fluidised form of pulling flow type, upflowing is very effective for microorganism growth.
Compare with traditional denitrification dephosphorization technique; Same under the situation that does not increase external carbon source; The denitrification effect of anaerobism microporous aerated oxidation ditch reactor drum of the present invention will improve nearly 20～40%; This is for the more and more stricter nitrogen phosphorus controlling index in present municipal sewage plant, and this anaerobism microporous aerated oxidation ditch is an optimal selection beyond doubt.
2) aerobic zone 4 (oxidation ditch) has been integrated the microporous aeration device in the traditional activated sludge process, has improved the utilising efficiency of dissolved oxygen in the aerobic zone greatly.Utilize thruster to replace the commentaries on classics brush and the plate-spinning device of conventional oxidation ditch, form good waterpower fluidised form, under the prerequisite that does not reduce horizontal flow velocity, greatly reduce the power consumption of promotion.
Adopt microporous aeration device and underwater propeller among the present invention.Microporous aeration device at first is set in each oxidation ditch at certain intervals, utilizes the micro-pore aeration mode to increase oxidation ditch process sewage and air contact area, it is high to have improved oxygen transfer efficiency.Secondly, the next-door neighbour is provided with underwater propeller in the downstream of microporous aeration device, utilizes lower energy consumption, satisfies oxidation ditch process and moves necessary horizontal flow velocity.In addition, underwater propeller has also increased the transmission of dissolved oxygen, thereby helps to improve the efficiency of oxygen supply of microporous aeration device.Underwater propeller to the raising of efficiency of oxygen supply mainly through two approach: make the water body fluidised form more be tending towards disorderly on the one hand, help the renewal at speed up gas and liquid interface and quicken the transfer of oxygen; Through weakening the influence of annular-flow, make in fact up-flow speed reduction of bubble on the other hand, correspondingly prolonged the duration of contact between the gas-liquid.
In addition; The ratio in the zone of the zone of the aerating apparatus that is provided with in the anaerobism microporous aerated oxidation ditch and non-aeration device is between 1/4～1/3; This compares with traditional activated sludge process technology 100% area arrangements aeration dispersion device, has practiced thrift the assembly cost of aerating apparatus greatly and has reduced operation energy consumption.
In view of above factor, it is good that anaerobism microporous aerated oxidation ditch technology has a treatment effect, characteristic of low energy consumption.
The pond of 3) improving system holds utilising efficiency
The utilization ratio of oxidation ditch system utilization rate of tank volume and dissolved oxygen and the utilization ratio of active sludge all have relation.Under the situation of microbial bacteria in the active sludge and dissolved oxygen and organic substrates full contact, the processing efficiency of system is only best.
Generally speaking, the ununiformity of oxygen supply aeration almost is inevitably in the aerobic aeration pond, so even the wind supply quantity that has adopted meet the specifications to require, the body part still can form dead angle, dead band in the pond.This circulation irrigation canals and ditches plug-flow form of oxidation ditch then can effectively be avoided the generation of analogue then.Therefore, utilize the mode of micro-pore aeration, after the increase underwater propeller improves transverse flow speed, help improving the utilization ratio that the pond holds.
Test result through actual sewage treatment plant further specifies advantage of the present invention and effect below.
Test condition and method:
With certain city 1.5 ten thousand m
3The WWT factory engineering of/d is an example, design influent quality COD 450mg/L, BOD 220mg/L, TN 50mg/L, NH
4-N 40mg/L, water outlet reaches one-level B emission standard.The main process that this project adopts is an anaerobism microporous aerated oxidation ditch technology, and the reactor drum useful volume is 12490m
3, 19.40 hours residence time, comprise hydrolysis, anaerobism, anoxic, aerobic and precipitate five treatment stage.Its processing technological flow is following:
Its flow process is: sewage is at first removed thick foreign material through coarse rack; Get into pump well through sewage after the initial gross separation; Rotary drum separating machine on the horizontal-flow grit chamber of flowing through after the pump lifting is further removed the smaller particles thing, and rotary drum separating machine trapped substance is transported to the refuse tip outward together with the grid slag that grid is retained down.Sewage gets into horizontal-flow grit chamber and carries out the sand water sepn behind the rotary drum separating machine, isolate sandstone liquid and remove the sandstone in the sewage through the sand water separation device, the sand of holding back outward transport.The settling pit water outlet gets into anaerobism microporous aerated oxidation ditch reactor drum of the present invention, and each item index is qualified discharge after microbial biochemical reaction is handled.
The excess sludge of from anaerobism microporous aerated oxidation ditch reactor drum, discharging is admitted to the collection mud sump, after the water extracter dehydration, and the mud cake outward transport.
Behind actual motion, as shown in table 1 to the sewage detection result before and after handling.Table 2 is processing parameter in the reactor drum during the WWT.
Processing parameter in the table 2 run duration reactor drum
| Sequence number | Title | Numerical value | Remarks |
| 1 | Reactor temperature ℃ | 13～29℃ | |
| 2 | Effluent recycling compares % | 100～200 | The mixed solution circulation |
| 3 | Sludge loading [kgBOD/ (kgMLVSS.d)] | 0.12 | |
| 4 | Sludge concentration MLSS mg/L | 2540 | |
| 5 | Denitrification is removed load [kgNO 3-N/N/m 3.d] | 0.1 | |
| 6 | Hydrolysis area residence time h | 2.5 | |
| 7 | Anaerobic zone residence time h | 1 | |
| 8 | Oxygen-starved area residence time h | 1.5 | |
| 9 | Settling region residence time h | 3 |
Can get according to actual project data, the effluent quality of anaerobism microporous aerated oxidation ditch technology can satisfy national urban wastewater treatment firm one-level B emission standard.The COD value of water outlet is below 50mg/L, and the ammonia nitrogen basic controlling is below 5mg/L, and total nitrogen concentration basically all maintains below the 15mg/L, and indivedual indexs can satisfy country-level A standard.
The investment of this project is 1200 yuan/ton, and ton water power consumption is 0.21kw.h/m
3, 0.35 yuan/m of direct operating cost
3, the about 0.55 yuan/m of unit operation cost
3
Claims (18)
1. anaerobism microporous aerated oxidation ditch reactor drum, this reactor drum comprise and adjoining each other and a plurality of treatment zones of hydraulic communication each other that said a plurality of treatment zones comprise:
Hydrolysis area (1); Pending sewage is introduced this hydrolysis area (1); And through stopping wherein acidication bacterium and denitrifying bacteria be hydrolyzed acidification and denitrification denitrogenation effect; With removal COD, BOD, ss suspended solid and total nitrogen index, and the hardly degraded organic substance in the sewage is converted into easy by biodegradable organism;
Anaerobic zone (2) is introduced this anaerobic zone (2) with the sewage after hydrolysis treatment from this hydrolysis area (1), and carries out anaerobic treatment through the anerobes that stops wherein, from sewage, discharges phosphorus;
Oxygen-starved area (3) is introduced this oxygen-starved area (3) with the sewage after anaerobic treatment from this anaerobic zone (2), and carries out anoxic denitrification processing, denitrogenation from sewage through the amphimicrobe that stops wherein;
Aerobic zone (4) is introduced this aerobic zone (4) with the sewage after anaerobic treatment from this oxygen-starved area (3), and through the oxygen supply mode sewage is removed organic carbon source, nitration treatment and aerobic suction phosphorus;
Settling region (5) is introduced this settling region (5) with the muddy water mixed solution of handling well from this aerobic zone (4), carries out mud-water separation, carries out mud discharging and the discharging of handling the back clear water then; Wherein
Between this settling region (5) and this hydrolysis area (1), be provided with supernatant return flow line (R1), make the supernatant that contains nitrate salt of discharging in this settling region (5) be back in this hydrolysis area (1), and utilize denitrifying bacteria to carry out denitrification and handle and remove nitrogenous source.
2. anaerobism microporous aerated oxidation ditch reactor drum according to claim 1; Wherein, Between this settling region (5) and this anaerobic zone (2), also be provided with mud return flow line (R2); Make in this aerobic zone (4), to be back to this anaerobic zone (2) from this settling region (5), keep enough microbial biomasss to continue to participate in anaerobic treatment through the part mud of removing organic carbon source and nitration treatment.
3. anaerobism microporous aerated oxidation ditch reactor drum according to claim 1; Wherein, Between this aerobic zone (4) and this oxygen-starved area (3), also be provided with mixed-liquor return passage (R3), make muddy water mixed solution that part in this aerobic zone (4) contains nitrate salt be back to continue to participate in anoxic denitrification in this oxygen-starved area (3) and handle.
4. anaerobism microporous aerated oxidation ditch reactor drum according to claim 3; Wherein, This aerobic zone (4) forms dual U-shaped circulation irrigation canals and ditches by four long strip shape raceway grooves side by side, is provided for the microporous aeration device (20) to the mikrobe oxygen supply at the middle part of every long strip shape raceway groove.
5. anaerobism microporous aerated oxidation ditch reactor drum according to claim 4 wherein, is provided with in order to promote the underwater propeller (19) that muddy water mixed solution circulates the downstream next-door neighbour who is arranged at every microporous aeration device (20) in the long strip shape raceway groove.
6. anaerobism microporous aerated oxidation ditch reactor drum according to claim 4 wherein, comprises in this aerobic zone (4):
Mixed-liquor return pump (14) is back to the part muddy water mixed solution in this aerobic zone (4) in this oxygen-starved area (3) in this mixed-liquor return passage (R3), and this mixed-liquor return pump (14) is arranged near this oxygen-starved area (3) to be located;
Communicating aperture (10) is used for being communicated with this settling region (5), and this communicating aperture (10) is arranged on the partition wall between this aerobic zone (4) and this settling region (5); And
Effluent weir (12) is used for the muddy water mixed solution after the collection and treatment, and this effluent weir (12) is arranged near this communicating aperture (10) and locates, and collected muddy water mixed solution is flowed into next treatment zone through this communicating aperture (10).
7. according to claim 1 or 2 or 3 described anaerobism microporous aerated oxidation ditch reactor drums, wherein, this hydrolysis area (1) rectangular shaped comprises in this hydrolysis area (1):
Water inlet pipe (23) is used for treatment sewage is introduced this hydrolysis area (1), and this water inlet pipe (23) is communicated with outside sewage running piping;
Communicating aperture (7) is used for being communicated with this anaerobic zone (2), and this communicating aperture (7) is arranged on the partition wall between this hydrolysis area (1) and this anaerobic zone (2); And
Effluent weir (11) is used to collect supernatant, and this effluent weir (11) is arranged near this communicating aperture (7) and locates, and collected supernatant is flowed into next treatment zone through this communicating aperture (7).
8. according to claim 1 or 2 or 3 described anaerobism microporous aerated oxidation ditch reactor drums; Wherein, This anaerobic zone (2) forms the circulation irrigation canals and ditches by two long strip shape raceway grooves side by side, is provided with at the middle part of every long strip shape raceway groove in order to promote the underwater propeller (17) that muddy water mixed solution circulates.
9. anaerobism microporous aerated oxidation ditch reactor drum according to claim 8 wherein, comprises communicating aperture (8) in this anaerobic zone (2), be used for being communicated with this oxygen-starved area (3), and this communicating aperture (8) is arranged on the partition wall between this anaerobic zone (2) and oxygen-starved area (3).
10. according to claim 1 or 2 or 3 described anaerobism microporous aerated oxidation ditch reactor drums; Wherein, This oxygen-starved area (3) forms the circulation irrigation canals and ditches by two long strip shape raceway grooves side by side, is provided with at the middle part of every long strip shape raceway groove in order to promote the underwater propeller (18) that muddy water mixed solution circulates.
11. anaerobism microporous aerated oxidation ditch reactor drum according to claim 10; Wherein, In this oxygen-starved area (3), comprise communicating aperture (9), be used for being communicated with that this communicating aperture (9) is arranged in this oxygen-starved area (3) and on the partition wall between this aerobic zone (4) with this aerobic zone (4).
12. according to claim 1 or 2 or 3 described anaerobism microporous aerated oxidation ditch reactor drums, wherein, this settling region (5) are formed by rectangular channel, in this settling region (5), comprise:
Distributing flue (26) is used for introducing this settling region (5) evenly distributedly from the effusive muddy water mixed solution of handling well of this aerobic zone (4), and this distributing flue (26) is arranged on the upstream extremity of this settling region (5);
Sludge bucket (24) is used for the sedimentary mud in this settling region (5) is collected, and this sludge bucket (24) is arranged near this distributing flue (26);
Effluent weir (13) is used to collect the supernatant after the mud-water separation and discharges, and this effluent weir (13) is arranged on the downstream end of this settling region (5).
13. anaerobism microporous aerated oxidation ditch reactor drum according to claim 2, this reactor drum also comprises:
Mud storage pool (6) is used for that the mud of this settling region (5) post precipitation is introduced this mud storage pool (6) and also stores wherein, and this mud storage pool (6) is arranged between this settling region (5) and this hydrolysis area (1).
14. anaerobism microporous aerated oxidation ditch reactor drum according to claim 13 wherein comprises in this mud storage pool (6):
Sludge reflux pump (15) is back to active sludge this anaerobic zone (2) from this settling region (5) in mud return flow line (R2); And
Mud discharging pump (16) is used for the excess sludge that contains phosphoric is discharged from this mud storage pool (6).
15. according to claim 1 or 2 or 3 described anaerobism microporous aerated oxidation ditch reactor drums; This reactor drum also comprises wet well (21); Be used for the supernatant that the effluent weir (13) of this settling region (5) is discharged is introduced wherein; This wet well (21) is arranged between this settling region (5) and this aerobic zone (4), in this wet well (21), comprises:
Supernatant reflux pump (22), the part supernatant of in supernatant return flow line (R1), this effluent weir (13) being discharged is back in this hydrolysis area (1); And
Rising pipe (25), the supernatant that is used for that this effluent weir (13) is discharged is discharged outside this reactor drum, and the clear water transport pipe is communicated with after this rising pipe (25) and the external treatment.
16. a sewage water treatment method, its application is carried out WWT according to any described anaerobism microporous aerated oxidation ditch reactor drum in the claim 1 to 15, and this method may further comprise the steps:
Pending sewage is introduced hydrolysis area (1); And through stopping wherein acidication bacterium and denitrifying bacteria be hydrolyzed acidification and denitrification denitrogenation effect; With removal COD, BOD, ss suspended solid and total nitrogen index, and the hardly degraded organic substance in the sewage is converted into easy by biodegradable organism;
Sewage after hydrolysis treatment is introduced this anaerobic zone (2) from this hydrolysis area (1), and carry out the releases phosphorus element processing of sewage through the anerobes that stops wherein;
Sewage after anaerobic treatment is introduced this oxygen-starved area (3) from this anaerobic zone (2), and carry out the denitrification denitrogenation processing of sewage through the amphimicrobe that stops wherein;
Sewage after anaerobic treatment is introduced this aerobic zone (4) from this oxygen-starved area (3), and through the oxygen supply mode sewage is carried out organic carbon source removal, nitration treatment and suction phosphorus and handle; And
The muddy water mixed solution of handling well is introduced this settling region (5) from this aerobic zone (4), carry out mud-water separation, carry out mud discharging and the discharging of handling the back clear water then; Wherein
When from this settling region (5) discharge supernatant; The part supernatant is carried out supernatant from this settling region (5) to this hydrolysis area (1) to reflux; The supernatant that feasible part contains nitrate salt is back in this hydrolysis area (1), and handles and remove nitrogenous source through utilizing denitrifying bacteria to carry out denitrification.
17. sewage water treatment method according to claim 16, it is further comprising the steps of:
When from this settling region (5) discharge mud, part mud is carried out mud from this settling region (5) to this anaerobic zone (2) reflux, make the mud that partly contains living microorganism be back to the middle continuation of this anaerobic zone (2) and participate in anaerobic treatment.
18. sewage water treatment method according to claim 16; It is further comprising the steps of: when in this aerobic zone (4), muddy water mixed solution being carried out that organic carbon source is removed and during nitration treatment; The muddy water mixed solution of part present is carried out mixed-liquor return from this aerobic zone (4) to this oxygen-starved area (3), make the muddy water mixed solution that partly contains nitrate salt be back to the middle participation anoxic denitrification that continues in this oxygen-starved area (3) and handle.
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| CN106186313A (en) * | 2015-05-07 | 2016-12-07 | 易百皓源（北京）环保科技有限公司 | For improveing integrated sewage disposal pond and the sewage water treatment method of AO |
| CN104925945B (en) * | 2015-05-22 | 2017-05-31 | 凌志环保股份有限公司 | Round Sump Carrousel oxidation ditch |
| CN105347488A (en) * | 2015-11-30 | 2016-02-24 | 华南理工大学 | Device and method for deep aeration in integrated oxidation ditch |
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| CN108503152A (en) * | 2018-06-21 | 2018-09-07 | 绍兴水处理发展有限公司 | A kind of stain disease denitrification process |
| CN109534598A (en) * | 2018-12-06 | 2019-03-29 | 上海清潺汇环境科技有限公司 | A kind of novel printing-dyeing waste water treatment process |
| CN109942154A (en) * | 2019-04-15 | 2019-06-28 | 浦华环保有限公司 | The method and system of the simultaneous aerobic FBC technical treatment sewage that is coupled of biology |
| CN113461257A (en) * | 2021-06-24 | 2021-10-01 | 贵州大学 | Integrated double-circulation oxidation ditch device for town sewage and treatment method |
| CN114634250A (en) * | 2022-03-17 | 2022-06-17 | 生态环境部华南环境科学研究所 | Plant floating plate oxidation ditch integrated device for sewage treatment and operation method |
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| JP3588047B2 (en) * | 2000-12-19 | 2004-11-10 | 大陽東洋酸素株式会社 | Biological phosphorus removal method in oxidation ditch |
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