CN102173510B - Sludge reflow-free device with simultaneous nitrification and denitrification (SND) function and operation control method thereof - Google Patents

Sludge reflow-free device with simultaneous nitrification and denitrification (SND) function and operation control method thereof Download PDF

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CN102173510B
CN102173510B CN201110050915XA CN201110050915A CN102173510B CN 102173510 B CN102173510 B CN 102173510B CN 201110050915X A CN201110050915X A CN 201110050915XA CN 201110050915 A CN201110050915 A CN 201110050915A CN 102173510 B CN102173510 B CN 102173510B
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water
aeration
mud
sludge
membrane
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CN201110050915XA
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CN102173510A (en
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冯华军
沈霞娟
赵博
吴春金
余秋璟
张倩
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浙江工商大学
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Abstract

The invention discloses a sludge reflow-free device with a simultaneous nitrification and denitrification (SND) function. The device comprises a pool body; the sidewall of the pool body is provided with a main water inlet; the interior of the pool body is divided by a clapboard into a diversion area, an aeration area and a sludge precipitation area in sequence; the aeration area is internally provided with an overflow groove; the bottom of the aeration area is provided with microporous aeration devices distributed uniformly; and the sludge precipitation area is internally provided with a membrane element. The invention also discloses an operation control method of the device. By skillful arrangement of aeration pipes and combined use with a biological membrane, the power cost and the operating cost of sludge reflow are saved, and the purpose of reducing energy consumption is achieved. The biological environment to be achieved by the simultaneous nitrification and denitrification is adjusted indirectly through adjusting parameters such as active sludge concentration, sludge age, unit sludge load and the like; the operation is strong in human controllability, and the problem that the microbial metabolic environment in the SND technology is not easy to control is solved.

Description

Mud with SND denitrification functions does not have reflux and progress control method thereof
Technical field
The present invention relates to have the biological removal of nitrogen technical field of synchronous nitration and denitrification effect, relating in particular to a kind of mud with sewage water denitrification function does not have reflux and progress control method thereof.
Background technology
Biological denitrification process comprises two main body reactions of nitrification and denitrification; The traditional biological denitrogenation is earlier the organonitrogen in the sewage to be converted into ammonia nitrogen; Through nitrifier ammonia nitrogen is converted into nitric nitrogen and nitrite nitrogen, the denitrification through denitrifying bacterium at last is translated into nitrogen release.Because two required chemical environments of reaction differ greatly; So traditional technology be with nitrification and denitrification respectively as on the space or temporal two independently the stage is realized the removals of nitrogen; But because nitration reaction consumes basicity, anti-nitration reaction need add reasons such as carbon source, often causes system complex; Energy consumption is bigger, the shortcoming of management trouble.
(Simultaneous nitrification and denitrification SND) is the microbial reaction phenomenon that nitration reaction and anti-nitration reaction carry out to synchronous nitration and denitrification in same reactor drum.Experiment showed, and in same treatment system, realize the synchronous nitration and denitrification process, the difficulty that can simplify the operation and technical process reduce the input of basicity and organic carbon source, thereby reduce investment outlay, improve processing efficiency.But because the influence factor of synchronous nitration and denitrification is numerous, DO, C/N, ORP and PH, temperature etc. all can produce material impact to its processing efficiency, so be difficult to its optimum operating condition of control in the engineering.
(Membrane Bioreactor, MBR) treatment technology is a kind of new and effective water technology that membrane separation technique is combined with biologic treating technique to membrane bioreactor.The effect of film is to substitute second pond in the membrane bioreactor; Compare with traditional biochemical water technology; Film can be trapped in organism in the bio-reactor, through keeping high organism concentration and hold back the high-molecular weight solute, impels into organic biological degradation in the water.And the sludge quantity of MBR system is also less relatively, even can realize zero-emission mud.The unit of membrane bioreactor outbalance is a membrane element, and the film of use is generally microfiltration membrane or ultra-filtration membrane.Membrane bioreactor is owing to have pollutants removal rate highly, and advantage such as effluent quality is good and stable, and excess sludge is few is that of water treatment field studies focus in recent years.But membrane bioreactor ubiquity membrane element work-ing life not high problem; This mainly is because membrane element is immersed in the aeration zone fully; A large amount of microbe metabolites can be trapped in the film surface; Cause problems such as film obstruction, this also is the restrictive factor that present MBR technology is further extensively promoted.Secondly membrane bioreactor generally can only be with the nitrated one-tenth nitrate salt of ammonia nitrogen, and not good to the removal effect of total nitrogen.
Chinese patent invention application 200610114524.9 discloses a kind of A 2The denitrifying gear of/O oxidation trench technology synchronous nitration.This device is supported well-anaerobic environment through the macroscopic view that forms in the DO on-line monitoring appearance monitoring love oxidation ditch aeration pond; Microcosmic through the monitoring of ORP on-line monitoring appearance forms in the oxidation ditch aeration pond is supported well-anaerobic environment; Utilize computer control frequency conversion gas blower control aeration rate, guarantee that the nitration reaction and the anti-nitration reaction of both macro and micro state carries out simultaneously.This device can effectively be controlled the reaction of synchronous nitration and denitrification in the water, but has system complex, and floor space is bigger, management inconvenience, and running cost is high, the shortcoming that excess sludge is many.
Summary of the invention
The invention provides a kind of SND of having denitrification effect, and realize that mud does not have effective, easy, the economic waste disposal plant of backflow.The progress control method that the present invention also provides the mud with SND denitrification functions not have reflux, this method operation is controlled, has solved the wayward microbial metabolism problem of environment of SND technology.
A kind of mud of the SND of having denitrification functions does not have reflux, comprises the pond body, and a sidewall of said pond body is provided with water main inlet port.Described pond body inner route clapboard is divided into water conservancy diversion district, aeration zone and sludge settling district successively, and described water conservancy diversion district is positioned near water main inlet port place side.Can below described dividing plate, flow guiding inclined plate be set as required, baffling buffering swash plate is set above it.Each regional size is by the decision of flooding velocity size, and the hydraulic detention time in general water conservancy diversion district is 0.3~0.5h, and the hydraulic detention time of aeration zone is 4~8h, and the hydraulic detention time of settling region is 1.0~2.0h.
Be provided with overflow groove in the described aeration zone; Promptly between body two side, pond, surround overflow groove with three baffle plates; The overflow groove height of baffle plate is higher than water main inlet port, and the pond body sidewall in the described overflow groove is provided with the branch water-in, and divides the height of water-in consistent with water main inlet port.Wherein the water inlet total flux of all branch water-ins is 15%~30% of a water main inlet port; Its effect is in order to replenish the denitrifying carbon source of synchronous nitration and denitrification effect; But all divide the water inlet total flux of water-in can not surpass 40% of water main inlet port; Otherwise meeting remarkably influenced water outlet ammonia nitrogen index may cause water outlet not up to standard.Water inlet gets into overflow groove from minute water-in, evenly flows to behind the submergence two side shield tops in the aeration zone of overflow groove below.
Bottom, described aeration zone is provided with equally distributed microporous aeration device, is row with the direction perpendicular to water (flow) direction, arranges by a certain percentage.The service radius of microporous aeration device is generally 0.3~0.5m, and (every row aerating apparatus can be to any direction effect; The air that promptly produces can reach distance and be 0.3-0.5m; The service distance that is microporous aeration device is generally 0.3~0.5m), and the column pitch of described microporous aeration device is 4~6 times of the one-sided service distance of micro-pore aeration.Making so all has LDO zone in per two row aeration regional centers, interregional at a distance from existing with high-solubility oxygen, helps the top condition that provides synchronous nitration and denitrification to realize on the macroscopic view.
The number of columns of the microporous aeration device of described minute water-in quantity visual response device bottom and decide promptly lack one than the microporous aeration device row, and the flow of all branch water-ins is equal.
Described microporous aeration device is connected with pneumatic pump.
Each divides on the midperpendicular that the distributing position of water-in is in adjacent two row microporous aeration device lines (being that overflow groove is positioned at adjacent two row microporous aeration device middle upper parts), and air-flow and the mud mixture in the aeration zone that the former water microporous aeration device capable of using that this moment, overflow weir came out produces carry out thorough mixing.Like this, body water inlet in pond is accomplished by water main inlet port and branch water-in jointly, prevents that along with water (flow) direction nutritive substance is under-supply in the latter half space, aeration zone, and microorganism growth is restricted, and efficient is removed in influence, thereby has guaranteed effluent quality.
Described settling region is equipped with membrane element, and described membrane element adopts the SE material, and membrane pore size is 2~10 μ m, and membrane element is lower than water main inlet port 15~20cm.Described membrane element connects two suction pumps through T-valve.When the settling region liquid level is higher than membrane element 15~20cm, utilize one of them suction pump to draw water to the pond body, then this device water outlet, suction pump quits work when liquid level is lower than membrane element.Every at a distance from 12 hours, body draws clear water from export-oriented pond by another suction pump, and membrane element is carried out back flushing 30S.Two suction pumps all can be controlled through the PLC controlling box automatically.
Bottom, described sludge settling district slopes inwardly and forms the bucket swash plate, and described bucket swash plate becomes 100~125 degree angles with horizontal plane.The setting of described bucket swash plate is in order to let active sludge slip into settling region bottom smoothly, thereby is back to the aeration zone.
Adopt membrane element to realize separating of active sludge and water outlet in the settling region, organism is trapped in the reactor drum, make that the organism concentration in the aeration zone is able to keep, promote organic biological degradation in the water.Simultaneously, this way has prolonged mud age, and the sludge quantity of generation is less relatively, even realizes the zero release of mud.Membrane element is installed in 15~20cm under the liquid level, has not only prevented the dry damaged of membrane element, prolong membrane lifetime, reduce the frequency of utilization of suction pump simultaneously, prevent physical damage.Regularly film is cleaned, prevent effectively that then membrane element from blocking because of life-time service causes fenestra.
Former water gets into mud by water main inlet port does not have reflux; Through water conservancy diversion district's dividing plate and baffling swash plate, large granular impurity sinks, and water body gets into the aeration zone from the bottom, aeration zone; Below overflow groove, pass through the aeration zone; Form mud mixture, and under the disturbance of microporous aeration device bubble, the former water that flows into branch water-in from overflow groove converges.Mud mixture is through the buffering eddy effect of mud baffling swash plate; Steadily get into traverse baffle and dividing plate and surround passage; Realize mud-water separation, water body gets into the sludge settling district, and active sludge passes through the guiding of flow guiding inclined plate and bucket swash plate in effect refluxed entering aeration zones such as self gravitations.When the settling region liquid level is higher than membrane element 15~20cm, utilize the water outlet suction pump to draw water to the pond body, then this device water outlet, when liquid level was lower than membrane element, suction pump this moment quit work.Every at a distance from 12 hours, body draws clear water from export-oriented pond by the back flushing suction pump, and membrane element is carried out back flushing.Two suction pumps are controlled through the PLC controlling box automatically.
A kind of mud of the above-mentioned SND of having denitrification functions does not have the progress control method of reflux, may further comprise the steps:
1. reactor start-up:
1) active sludge being inoculated into above-mentioned mud does not have in the aeration zone of reflux, and initial sludge concentration is controlled at 5000~6000mg/L, and pH maintains 6.5~7.5 in the controlling reactor, and initial dissolution oxygen is 1.5~2.0mg/L;
2) in pending former water, add a certain proportion of nontoxic and C/N than greater than 40 carbohydrate waste water, making the C/N ratio that mixes the mixing water inlet that the back forms is 15~20, will mix water inlet slowly in the introducing reactor drum;
3) if dissolved oxygen content of survey aeration zone mud mixture greater than 2.0mg/L, reduces aeration rate; If less than 1.5mg/L, increase aeration rate; The control dissolved oxygen content is at 1.5~2.0mg/L;
4) activated sludge concentration and SV are surveyed in mud sampling 30(active sludge is the volume of sedimentation after 30 minutes in 1000 milliliters of graduated cylinders) can calculate sludge volume index according to formula (1):
SVI = SV 30 MLSS - - - ( 1 )
If SVI>130, one or more that then adopt following method are adjusted: 1. intermittently mud is got in manual work; 2. turn aeration rate down; 3. if MLSS=5000 then reduces the ratio of mixing carbohydrate waste water in the water inlet;
If SVI<80, one or more that then adopt following method are adjusted: 1. increase aeration rate; 2. increase the ratio of mixing carbohydrate waste water in the water inlet.Make aeration zone SVI maintain 80~130 through above-mentioned adjustment;
5) survey aeration zone mud mixture dissolved oxygen content, if DO>1.0mg/L then turns aeration rate down; If DO<0.6mg/L then increases aeration rate, make DO maintain 0.6~1.0mg/L through adjustment;
6) survey activated sludge concentration, if MLSS>5000mg/L, one or more that then adopt following method are adjusted: 1. adopt the intermittently suitable spoil disposal of mode of artificial spoil disposal; 2. reduce to mix the ratio of carbohydrate waste water in the water inlet; If MLSS<4000mg/L then selects according to the C/N ratio situation: if C/N≤15 increase the ratio of mixing carbohydrate waste water in the water inlet; If C/N>15 let mud self-sow for some time, sludge concentration increases gradually.
7) through aforesaid operations, on guaranteeing that the Inlet and outlet water nitrogen removal rate is greater than 60% basis, gradually reduce the ratio of mixing carbohydrate waste water in the water inlet, finally adopt complete sewage water inlet.When nitrogen removal rate greater than 60%, dissolved oxygen is controlled at 0.6~1.0mg/L, and makes SVI maintain 80~130, activated sludge concentration maintains 4000~5000mg/L, promptly reactor drum the unloading phase finish, can formally put into operation;
2. calculate the useful volume of body aeration zone, pond,, change water-in and the flooding velocity that divides water-in, unit sludge COD load is controlled at 0.30~0.40kg (COD)/(kgMLSSd) according to the COD concentration of water inlet; Monitor the changing conditions of aeration zone dissolved oxygen simultaneously, regulate microporous aeration device, dissolved oxygen is controlled at 0.6~1.0mg/L;
3. work as the settling region liquid level and be higher than membrane element 15~20cm, utilize the water outlet suction pump to draw water, realize mud-water separation in the settling region to the pond body; Membrane element is carried out back flushing, make the mud of settling region come-up get back to the aeration zone, the mud mud of no reflux was controlled at 40~50 days age.
The present invention adopts mud not have reflux; And be used in combination, but in actual operation, still have a small amount of discarded active sludge and produce with microbial film; Control mud age was at 40~50 days; Reduce the generation of excess sludge, reduced mud reflux and power-equipment simultaneously, reached the purpose that cuts down the consumption of energy.
Denitrogenate in the technology at synchronous nitration and denitrification, dissolved oxygen content is the most key factor, yet dissolved oxygen content is wayward in the muddy water mixed solution; And it is bigger influenced by weather, season, temperature etc.; The present invention regulates parameter indirect regulation dissolved oxygens such as mud mud age and control unit sludge load through the regulation and control sludge concentration, reaches the needed coenocorrelation of synchronous nitration and denitrification; Artificial controllability is strong in the operation, has solved the wayward microbial metabolism problem of environment of SND technology.
Description of drawings
Fig. 1 is the cross-sectional view of apparatus of the present invention;
Fig. 2 is the plan structure synoptic diagram of apparatus of the present invention.
Description of reference numerals:
3-aeration zone 4-sludge settling district, 1-water main inlet port 2-water conservancy diversion district
5-overflow groove 6-membrane element 7-divide water-in 8-microporous aeration device
9-pneumatic pump 10-water outlet suction pump 11-water conservancy diversion district dividing plate 12-flow guiding inclined plate
Dividing plate 15-aeration zone, 13-mud traverse baffle 14-aeration zone flow guiding inclined plate
16-sludge settling district dividing plate 17-sludge settling district flow guiding inclined plate
18-back flushing suction pump 19-pond body
Fig. 3 is the reactor start-up stage process schema in the control method of apparatus of the present invention.
Embodiment
Like Fig. 1, shown in 2, a kind of mud of the SND of having denitrification functions does not have reflux, comprises pond body 19, and a sidewall of pond body 19 is provided with water main inlet port 1.Body 19 inside, described pond are divided into water conservancy diversion district 2, aeration zone 3 and sludge settling district 4 successively by dividing plate; Water conservancy diversion district 2 is positioned at the side near water main inlet port 1; The hydraulic detention time in water conservancy diversion district 2 is about 0.3~0.5h; The hydraulic detention time of aeration zone 3 is about 4~8h, and the hydraulic surface loading of settling region 4 is controlled at 0.6-0.9m 3/ m 2.h.
Be provided with water conservancy diversion district dividing plate 11 and water conservancy diversion district flow guiding inclined plate 12 between described water conservancy diversion district 2 and the aeration zone 3; Be provided with mud baffling buffering swash plate 13, aeration zone dividing plate 14 and aeration zone flow guiding inclined plate 15 between described aeration zone 3 and the sludge settling district 4; Also be provided with sludge settling district dividing plate 16 and sludge settling district flow guiding inclined plate 17 in the sludge settling district 4.
As shown in Figure 1; Be provided with two overflow grooves 5 in the described aeration zone 3; Each overflow groove 5 is respectively surrounded between body two side, pond by three baffle plates, and described overflow groove 5 two ends are connected with the pond body sidewall, and two side shields upper ends of overflow groove 5 are higher than water main inlet port 1; The pond body sidewall that is positioned at overflow groove 5 is provided with branch water-in 7, divides the height of water-in 7 consistent with water main inlet port 1.All divide the water inlet total flux of water-ins 7 is 15%~30% of water main inlet port 1, specifically adjusts with the TN clearance according to influent quality C/N and water outlet COD, and the effect that divides water-in is the denitrifying carbon source for additional synchronous nitration and denitrification effect.All divide the flow of water-in equal basically.
3 bottoms, described aeration zone are provided with equally distributed microporous aeration device 8, are row with the direction perpendicular to water (flow) direction, arrange by a certain percentage.The service radius of microporous aeration device is generally 0.3~0.5m, and (circle among the figure i.e. a row microporous aeration device; Every row aerating apparatus can be to any direction effect; The air that promptly produces can reach distance and be 0.3-0.5m), the column pitch L of described microporous aeration device 8 is 4~6 times of the one-sided service distance of micro-pore aeration.Making so all has LDO zone in per two row aeration regional centers, interregional at a distance from existing with high-solubility oxygen, helps the top condition that provides synchronous nitration and denitrification to realize on the macroscopic view.
Each divides on the vertical line of the line that the distributing position of water-in 7 is in adjacent two row microporous aeration devices 8; Be that overflow groove is positioned at adjacent two row microporous aeration device middle upper parts; Divide water-in quantity visual response device bottom microporous aeration device number of columns and decide, the quantity of promptly dividing water-in 1 is lacked one than the columns of microporous aeration device 8.
Described microporous aeration device 8 is connected with pneumatic pump 9.
Described settling region 4 is equipped with membrane element 6, and described membrane element 6 adopts the SE material, and membrane pore size is 2, and membrane element is lower than right side water main inlet port 1 and is 15cm.Membrane element 6 connects suction pump 10 and suction pump 18 through T-valve.When the settling region liquid level is higher than membrane element 15cm, utilize water outlet suction pump 10 to draw water to the pond body, then this device water outlet, when liquid level was lower than membrane element, suction pump this moment quit work.Every body drew clear water from export-oriented pond by the back flushing suction pump at a distance from 12 hours, and membrane element carries out back flushing 30S.Two suction pumps are controlled by the PLC controlling box automatically.
4 bottoms, described sludge settling district slope inwardly and form bucket swash plate 20.
The reactor start-up process is operated as follows:
1) active sludge being inoculated into above-mentioned mud does not have in the aeration zone of reflux, and initial sludge concentration is controlled at 5000~6000mg/L, and pH maintains 6.5~7.5 in the controlling reactor, and initial dissolution oxygen is 1.5~2.0mg/L.
2) in pending former water, add a certain proportion of nontoxic and C/N than greater than 40 carbohydrate waste water (the for example higher foodstuff production waste water of sugar degree such as beer industrial waste water, fruit juice wastewater), making the C/N ratio that mixes the mixing water inlet that the back forms is 15~20.To mix water inlet and slowly introduce in the reactor drum, mud is progressively grown.
3) survey the dissolved oxygen content (DO) of aeration zone mud mixture, DO is at 1.5~2.0mg/L in control, if excessive or too smallly then regulate through reducing or increase aeration rate.
4) activated sludge concentration (MLSS), SV are surveyed in mud sampling 30, can calculate sludge volume index (SVI) according to formula (1):
SVI = SV 30 MLSS - - - ( 1 )
If calculate SVI>130, one or more that then adopt following method are adjusted: 1. intermittently mud is got in manual work; 2. turn aeration rate down; 3. if MLSS=5000 then reduces the ratio of mixing carbohydrate waste water in the water inlet.If SVI<80, one or more that then adopt following method are adjusted: 1. increase aeration rate; 2. increase the ratio of mixing carbohydrate waste water in the water inlet.Make aeration zone SVI maintain 80~130 through above-mentioned adjustment.
5) dissolved oxygen content (DO) of survey aeration zone mud mixture is if DO>1.0mg/L then turns aeration rate down; If DO<0.6mg/L then increases aeration rate, make DO maintain 0.6~1.0mg/L through adjustment.
6) survey activated sludge concentration (MLSS), if MLSS>5000mg/L, one or more that then adopt following method are adjusted: 1. adopt the intermittently suitable spoil disposal of mode of artificial spoil disposal; 2. reduce to mix the ratio of carbohydrate waste water in the water inlet.If MLSS<4000mg/L then selects according to C/N ratio (C/N) situation: if C/N<15 increase the ratio of mixing carbohydrate waste water in the water inlet; If C/N>15 let mud self-sow for some time, sludge concentration increases gradually;
If activated sludge concentration is excessive; Then cause consuming more dissolved oxygens, be unfavorable for energy efficient, the too small processing efficiency that then influences former water of activated sludge concentration; In the process that reduces sludge concentration, monitor SVI, guarantee upgrowth situation that active sludge is good and the ability of disposing of sewage.
7), on guaranteeing that the Inlet and outlet water nitrogen removal rate is greater than 60% basis, gradually reduce the ratio of mixing carbohydrate waste water in the water inlet through aforesaid operations; The complete sewage water inlet of final employing, nitrogen removal rate is greater than 60%, and dissolved oxygen is controlled at 0.6~1.0mg/L; And make SVI maintain 80~130; Activated sludge concentration maintains 4000~5000mg/L, and promptly the unloading phase end of reactor drum can formally put into operation.
Calculate the useful volume of body aeration zone, pond; According to the COD concentration of water inlet, change water-in 1 and the flooding velocity that divides water-in 7, unit sludge COD load is controlled at 0.30~0.40kg (COD)/(kgMLSSd); Because the utilization of carbon source consumes dissolved oxygen; Should monitor the changing conditions of aeration zone dissolved oxygen simultaneously, regulate microporous aeration device, dissolved oxygen is controlled at 0.6~1.0mg/L.
Former water gets into mud by water main inlet port does not have reflux; Through water conservancy diversion district's dividing plate and baffling swash plate, large granular impurity sinks, and water body gets into the aeration zone from the bottom, aeration zone; Below overflow groove, pass through the aeration zone; Form mud mixture, and under the disturbance of microporous aeration device bubble, the former water that flows into branch water-in from overflow groove converges.Mud mixture is through the buffering eddy effect of mud baffling swash plate; Steadily get into traverse baffle and dividing plate and surround passage; Realize mud-water separation, water body gets into the sludge settling district, and active sludge passes through the guiding function of flow guiding inclined plate in effect refluxed entering aeration zones such as self gravitations.When the settling region liquid level is higher than membrane element 15~20cm, utilize the water outlet suction pump to draw water to the pond body, then this device water outlet realizes mud-water separation in the settling region.When liquid level was lower than membrane element, suction pump this moment quit work.Every at a distance from 12 hours, body draws clear water from export-oriented pond by the back flushing suction pump, and membrane element is carried out back flushing, and the mud that the settling region is floated is got back to the aeration zone, and the mud mud of no reflux was controlled at 40~50 days age.Two suction pumps are controlled through the PLC controlling box automatically.
Embodiment one
Sewage with institute's transfer of emerald green garden, Hangzhou one district's city domestic sewage pipe network pumping plant is water inlet; Between the starting period, add sucrose; Regulate waste water C/N than about 20; Active sludge and reactor assembly with above control method domestication make an experiment, and tame approximately after 10 days and phase out the sucrose dosage, adopt former water as water inlet after 20 days fully.
Move 2 months, the water inlet total nitrogen concentration is between 51.45~70.02mg/L, and water inlet COD concentration is at 366~742.16mg/L, and influent ammonium concentration is between 40.85~63.21mg/L.Under the stable condition of reactor drum, the effluent quality detected result is as shown in the table, basic discharged without residual mud.
Water inlet C/N ratio SVI Nitrogen removal rate % COD clearance % Ammonia nitrogen removal frank %
10.4 75.68 90 92 98
12.4 68.09 90 94 95
10.6 90.5 81 93 95
8.7 68.89 88 89 95
9.1 85.62 90 96 91
8.3 92 93 94 98

Claims (8)

1. the mud with SND denitrification functions does not have reflux; Comprise the pond body; The sidewall of described pond body is provided with water main inlet port; It is characterized in that: described pond body inner route clapboard is divided into water conservancy diversion district, aeration zone and sludge settling district successively, is provided with water conservancy diversion district dividing plate and water conservancy diversion district flow guiding inclined plate between described water conservancy diversion district and the aeration zone; Be provided with mud baffling buffering swash plate, aeration zone dividing plate and aeration zone flow guiding inclined plate between described aeration zone and the sludge settling district; Also be provided with sludge settling district dividing plate and sludge settling district flow guiding inclined plate in the sludge settling district, described water conservancy diversion district is positioned near water main inlet port place side;
Be provided with overflow groove in the described aeration zone, described overflow groove is for to surround with three baffle plates between body two side, pond, and the baffle plate of described overflow groove upper end is higher than water main inlet port; Be provided with the branch water-in in the described overflow groove; Bottom, described aeration zone is provided with equally distributed microporous aeration device;
Described sludge settling is equipped with membrane element in the district; Bottom, described sludge settling district slopes inwardly and forms the bucket swash plate.
2. the mud of the SND of having denitrification functions as claimed in claim 1 does not have reflux, it is characterized in that: with the direction perpendicular to water (flow) direction is row, and the column pitch of described microporous aeration device is 4~6 times of the one-sided service distance of micro-pore aeration.
3. the mud of the SND of having denitrification functions as claimed in claim 1 does not have reflux; It is characterized in that: described membrane element is hydrophobic microfiltration membrane element; Mould material adopts the SE material, and membrane pore size is 2 μ m~10 μ m, and the height of membrane element is lower than water main inlet port 15~20cm.
4. the mud of the SND of having denitrification functions as claimed in claim 1 does not have reflux, it is characterized in that: described bucket swash plate becomes 100~125 degree angles with horizontal plane.
5. the mud of the SND of having denitrification functions as claimed in claim 1 does not have reflux, it is characterized in that: described microporous aeration device is connected with pneumatic pump, and described membrane element is connected with the back flushing suction pump with the water outlet suction pump through T-valve.
6. the mud of the SND of having denitrification functions as claimed in claim 1 does not have reflux; It is characterized in that: the height of described minute water-in is consistent with water main inlet port, and the distributing position of described minute water-in is on the midperpendicular of line of adjacent two row microporous aeration devices; Branch water-in quantity is lacked one than the columns of microporous aeration device.
7. the mud like the described SND of the having denitrification functions of the arbitrary claim of claim 1-6 does not have the progress control method of reflux, it is characterized in that, may further comprise the steps:
1. reactor start-up:
1) active sludge being inoculated into above-mentioned mud does not have in the aeration zone of reflux, and initial sludge concentration is controlled at 5000~6000mg/L, and pH maintains 6.5~7.5 in the controlling reactor, and initial dissolution oxygen is 1.5~2.0mg/L;
2) in pending former water, add a certain proportion of nontoxic and C/N than greater than 40 carbohydrate waste water, making the C/N ratio that mixes the mixing water inlet that the back forms is 15~20, will mix water inlet slowly in the introducing reactor drum;
3) if dissolved oxygen content of survey aeration zone mud mixture greater than 2.0mg/L, reduces aeration rate; If less than 1.5mg/L, increase aeration rate; The control dissolved oxygen content is at 1.5~2.0mg/L;
4) activated sludge concentration and SV are surveyed in mud sampling 30, can calculate sludge volume index according to formula (1):
SVI = SV 30 MLSS - - - ( 1 )
If SVI>130, one or more that then adopt following method are adjusted: 1. intermittently mud is got in manual work; 2. turn aeration rate down; 3. if MLSS=5000 then reduces the ratio of mixing carbohydrate waste water in the water inlet;
If SVI<80, one or more that then adopt following method are adjusted: 1. increase aeration rate; 2. increase the ratio of mixing carbohydrate waste water in the water inlet, make aeration zone SVI maintain 80~130 through above-mentioned adjustment;
5) survey aeration zone mud mixture dissolved oxygen content, if DO>1.0mg/L then turns aeration rate down; If DO<0.6mg/L then increases aeration rate, make DO maintain 0.6~1.0mg/L through adjustment;
6) survey activated sludge concentration, if MLSS>5000mg/L, one or more that then adopt following method are adjusted: 1. adopt the intermittently suitable spoil disposal of mode of artificial spoil disposal; 2. reduce to mix the ratio of carbohydrate waste water in the water inlet; If MLSS<4000mg/L then selects according to the C/N ratio situation: if C/N≤15 increase the ratio of mixing carbohydrate waste water in the water inlet; If C/N>15 let mud self-sow for some time, sludge concentration increases gradually;
7), on guaranteeing that the Inlet and outlet water nitrogen removal rate is greater than 60% basis, gradually reduce the ratio of mixing carbohydrate waste water in the water inlet through aforesaid operations; Final adopt complete sewage water inlet, when nitrogen removal rate greater than 60%, dissolved oxygen is controlled at 0.6~1.0mg/L; And make SVI maintain 80~130; Activated sludge concentration maintains 4000~5000mg/L, and promptly the unloading phase end of reactor drum formally puts into operation;
2. calculate the useful volume of body aeration zone, pond,, change water-in and the flooding velocity that divides water-in, unit sludge COD load is controlled at 0.30~0.40kg (COD)/(kgMLSSd) according to the COD concentration of water inlet; Monitor the changing conditions of aeration zone dissolved oxygen simultaneously, regulate microporous aeration device, dissolved oxygen is controlled at 0.6~1.0mg/L;
3. work as the settling region liquid level and be higher than membrane element 15~20cm, utilize the water outlet suction pump to draw water, realize mud-water separation in the settling region to the pond body; Every at a distance from 12 hours, body draws clear water from export-oriented pond by the back flushing suction pump, and membrane element is carried out back flushing, and the mud that the settling region is floated is got back to the aeration zone, and the mud mud of no reflux was controlled at 40~50 days age.
8. progress control method as claimed in claim 7 is characterized in that: described carbohydrate waste water is beer industrial waste water or fruit juice wastewater.
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