CN102515431A - Integrated technology for high efficiency nitrogen and phosphorus removal based on sludge emission reduction and device thereof - Google Patents
Integrated technology for high efficiency nitrogen and phosphorus removal based on sludge emission reduction and device thereof Download PDFInfo
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Abstract
The invention relates to an integrated technology for the high efficiency nitrogen and phosphorus removal based on sludge emission reduction. The technology comprises the following steps: 1, sewage filtered by a grating enters an anaerobic pool and is fully mixed with sludge in the anaerobic pool under stirring, the obtained anaerobic outlet water enters an anoxic pool and fully contacts with sludge in the anoxic pool, the obtained anoxic outlet water enters an aerobic pool and is fully mixed with sludge in the aerobic pool, and the obtained mixed liquor circulatingly flows in the aerobic pool; 2, a moiety of the mixed liquor backflows to the anoxic pool; and 3, the other moiety of the mixed liquor is discharged after solid-liquid separation carried out by a membrane assembly. According to the technology of the invention, A2/O is combined with a membrane biological reactor (MBR), so the concentration of the sludge in the aerobic pool is higher than sludge concentrations through routine active sludge methods, and the sludge age is prolonged; and additionally, the sludge concentrations of above three pools are adjusted through stirring and backflow processing, so nitrogen and phosphorus removal effects are enhanced, and processed outlet water indexes can reach a first order standard A in GB18918-2002.
Description
Technical field
The invention belongs to environment and public works technical field, be specifically related to a kind of A that reduces discharging based on mud
2/ O-MBR high-efficient denitrification and dephosphorization integrated technique is applicable to advanced treatment and middle water reuse in municipal effluent, the Industrial Wastewater Treatment.
Background technology
Because world population increases and The development in society and economy, the water quality eutrophication is also serious day by day, so various countries have also formulated strict nitrogen phosphorus emission standard, and denitrification dephosphorization technique also receives much concern." urban wastewater treatment firm pollutant emission standard " from enforcement on July 1 in 2003 (GB18918-2002) proposed more strict requirement to urban wastewater treatment firm water outlet TN (total nitrogen) and TP (total phosphorus).In the denitrification dephosphorization technique flow process of routine,, be difficult to obtain good denitrogenation dephosphorizing effect usually because the partition ratio of anaerobic zone and oxygen-starved area sludge quantity, releases phosphorus and denitrification process contention carbon source, thalline sludge age require not equal problem.Therefore, study that denitrogenation dephosphorizing and mud emission-reduction technology are just significant efficiently.
Traditional activated sludge process remains the dirty water living creature processing technique of domestic and international main flow at present; But; The surplus sludge volume that traditional activated sludge process produces is big; The sludge treatment expense can account for about 50-60% of sewage work's construction and operation total expenses, and disposing the required huge investment of excess sludge also is a big problem of biological sewage treatment.A large amount of excess sludges and high processing costs have become one of important factor of restriction dirty water living creature processing technique development.Therefore how fundamentally to solve the focus that the excess sludge reduction problem has been world today's common concern.
Summary of the invention
The object of the invention is to provide a kind of high-efficient denitrification and dephosphorization integrated technique and device that reduces discharging based on mud, and this technology can improve traditional biological denitrogenation dephosphorizing rate on the basis of reducing excess sludge discharge, reach the intensified denitrification and dephosphorization effect.
For realizing above-mentioned purpose, the present invention adopts following technical scheme:
A kind of high-efficient denitrification and dephosphorization integrated technique that reduces discharging based on mud, this technology is: the sewage behind grid filtration gets in the anaerobic pond, under agitation condition with anaerobic pond in mud mixing (guaranteeing that both fully contact); The anaerobism water outlet is flowed out the back from anaerobic pond and is got into the anoxic pond, with the mud mixing (guaranteeing that both fully contact) in the anoxic pond; The anoxic water outlet is flowed out the back from anoxic pond and is got in the Aerobic Pond, and with the mud thorough mixing in the Aerobic Pond, mixed solution circulates in Aerobic Pond; Wherein a part of mixed-liquor return is to anoxic pond; Another part mixed solution is expel liquid after the membrane module solid-liquid separation.
Concrete, mixing speed is 10～100 r/min in the said anaerobic pond; Liquid portion is back to anaerobic pond in the said anoxic pond; Sludge concentration in the said Aerobic Pond is 5～15 g/L.
Preferably, mixing speed is 20～40 r/min in the said anaerobic pond, anaerobic pond sludge concentration 2～30 g/L, anaerobic pond hydraulic detention time 1～10 h, anaerobism water outlet suspended sediment concentration (SS) 0.1～6.0g/L; Said anoxic pond sludge concentration 2～20 g/L, anoxic pond hydraulic detention time 0.5～4 h, anoxic water outlet suspended sediment concentration (SS) 0.1～6.0g/L, anoxic pond to anaerobic pond reflux ratio greater than 0 smaller or equal to 300%; Said Aerobic Pond sludge concentration 5～10 g/L, Aerobic Pond hydraulic detention time 1～20 h, Aerobic Pond dissolved oxygen content 0.5～4.0mg/L, Aerobic Pond to anoxic pond reflux ratio 100～500%.
Preferably, said anaerobic pond sludge concentration 5～20 g/L, anaerobic pond hydraulic detention time 3～5 h; Said anoxic pond sludge concentration 5～10 g/L, anoxic water outlet suspended sediment concentration 0.1～3.0g/L, anoxic pond to anaerobic pond reflux ratio 100～300%; Said Aerobic Pond hydraulic detention time 4～8 h, Aerobic Pond dissolved oxygen content 2.0～3.0mg/L (GWR: i.e. aeration rate and the ratio preferred 10～15 of handling the water yield), Aerobic Pond to anoxic pond reflux ratio 200～300%.In addition, suitable kept anaerobic pond upflow velocity is 2～3.5 * 10
-4M/s.
A kind of device that is used for the said high-efficient denitrification and dephosphorization integrated technique that reduces discharging based on mud, this device comprises anaerobic pond, anoxic pond and the Aerobic Pond that connects successively, is provided with whisking appliance in the anaerobic pond; The anaerobic pond lower end is provided with the water inlet pipe upper end and is provided with rising pipe; The anaerobic pond rising pipe is connected with the water-in of anoxic pond lower end, and the anoxic pond upper end wall is provided with the spilling water groove outward, and the spilling water groove is connected with the water-in of being located at the Aerobic Pond middle part; Be provided with flow apron and aerating apparatus in the Aerobic Pond; Membrane module is positioned at the aerating apparatus top, and Aerobic Pond lower end refluxing opening is connected with anoxic pond through reflux pump, and the Aerobic Pond bottom is provided with shore pipe.
Concrete, said anaerobic pond and anoxic pond can be integral type (both are through the backflow seam connection of lower end), also can be for independent split type.Integral type does not need extra the mud refluxing unit to be set, but the sludge concentration in quick adjustment two ponds; The split type operational administrative of being convenient to, each tool advantage of dual mode.
The lower side of said Aerobic Pond and the angle of level ground are acute angle, preferably are miter angle.In addition, the lower end of Aerobic Pond also can be curved, is beneficial to sludgd deposition so equally and waterpower circulates.
Said anaerobic pond rising pipe goes out water pump through first and is connected with the water-in of anoxic pond lower end; The outlet of said membrane module and second goes out water pump and is connected.
Process using anaerobic pond of the present invention, anoxic pond, Aerobic Pond and membrane module combine; Whisking appliance is set in anaerobic pond; Change level of disruption through regulating agitator speed to the bottom sludge blanket; The sludge concentration that influences in the anaerobic pond distributes, thus the suspended sediment concentration in the control top water outlet.Through reflow treatment, make anaerobic pond can share the sludge concentration of anoxic pond and Aerobic Pond.Mud circulates in the total system, and the phosphorus of releasing that is beneficial to polyP bacteria is inhaled the phosphorus effect, is beneficial to the sludge concentration balance that keeps each reactive moieties.Membrane module is set in the Aerobic Pond, and the film water outlet can effectively reduce the suspended sediment concentration of water outlet, avoids long nitrifier and polyP bacteria of generation cycle to run off; Increase microbe population; Improve microbial growth speed and metabolic activity, thereby strengthen denitrification effect, polyP bacteria has obtained great enrichment simultaneously; Improve polyP bacteria shared ratio in Sludge System, thereby strengthened phosphor-removing effect.In addition; Film water outlet suspended sediment concentration is low can be realized artificially controlling sludge volume with stable characteristics and be beneficial to process strengthening going out to gather the polyP bacteria that the phosphorus ability is strengthened; System only need discharge a small amount of rich phosphorated mud just can keep the stable of total system; Sludge discharge (ton mud/1 ton of water of processing): 0.001～0.01, the mud CER: 50～90%, reach the purpose that mud reduces discharging.
In addition, the pressure crown_interception of film can also effectively reduce each item monitoring index of water outlet, and holds back down the organic substance of difficult degradation, strengthens the degraded of bacterium to hard-degraded substance, cultivates the mikrobe that activity is better, adaptive faculty is stronger.Difficult degradation simultaneously or slow degradation material also are beneficial to the increase of the residence time and are degraded, thereby are fundamentally reducing sludge yield, only need the appropriateness discharging be rich in the balance of phosphorus sludge in order to phosphorus content in the assurance system.The enhancing of the increase of nitrobacteria and polyP bacteria quantity and ability makes degree of nitration better in the system, and it is stronger to gather the phosphorus ability, is more conducive to the intensified denitrification and dephosphorization effect.
Technology of the present invention is A
2/ O-MBR strengthening denitrogenation dephosphorization technique both can reach denitrification dephosphorization technique efficiently, can reduce the discharging of excess sludge again, reduced the sludge treatment expense, reached the purpose of wastewater treatment and reuse.Process characteristic of the present invention is: (1) this integrated technique makes the interior sludge concentration (5～15 g/L) of Aerobic Pond be higher than the sludge concentration (2～4 g/L) in the Aerobic Pond in the conventional activated sludge method; Prolonged sludge age (60～600 days); Make mud obtain autoxidation, fundamentally reduce sludge yield.(2) this integrated technique is on the basis of traditional biological denitrogenation; Can give full play to the efficient crown_interception of membrane module, avoid the loss of long nitrifier of generation cycle, increase nitrifier quantity; Whole multiplication rate of nitrifier and metabolic activity are improved, strengthen denitrification effect.(3) this integrated technique is given full play to the efficient crown_interception of film on the basis of traditional biological dephosphorization; PolyP bacteria shared ratio in Sludge System is improved; Strengthen polyP bacteria and inhale the phosphorus ability, the phosphorus content of water outlet is reduced, strengthen the denitrogenation dephosphorizing effect through discharging rich phosphorus sludge.(4) this integrated technique makes that sludge concentration is higher than the sludge concentration in the conventional activated sludge method in the system, and high sludge concentration has reduced hydraulic detention time.In addition, Aerobic Pond mud is back to anoxic pond earlier and is back to anaerobic pond by anoxic pond again, and the release of phosphorus has strengthened the denitrogenation dephosphorizing effect under the nitrate salt inhibition anaerobic condition of having avoided carrying in the returned sluge.
Description of drawings
Fig. 1 is the schematic flow sheet of integrated technique according to the invention;
Fig. 2 is the apparatus structure synoptic diagram of the said technology of Fig. 1,1 anaerobic pond wherein, 2 anoxic pond, 3 Aerobic Ponds, 4 anaerobic pond water inlet pipes, 5 anaerobism rising pipes; 6 anoxic pond, first water-in, 7 anoxic pond, second water-in, 8 Aerobic Pond water-ins, 9 Aerobic Pond shore pipes, 10 whisking appliances; 11 spilling water grooves, 12 reflux stitches 13 reflux pumps, 14 flow aprons, 15 membrane modules; 16 aerating apparatuss, 17 second go out water pump, and 18 first go out water pump, 19 spilling water groove water outlets, 20 Aerobic Pond refluxing openings.
Embodiment
Below through preferred embodiment technology of the present invention is done further explain, but protection domain of the present invention is not limited thereto.
Embodiment 1
A kind of high-efficient denitrification and dephosphorization integrated technique that reduces discharging based on mud, this technology is: through the sewage behind the grid filtration in the bottom gets into anaerobic pond, mud thorough mixing under agitation condition and in the anaerobic pond; The anaerobism water outlet is flowed out the back and is got into the anoxic pond from the bottom from anaerobic pond top, mix with mud in the anoxic pond; The anoxic water outlet is flowed out the back in the middle part gets into Aerobic Pond from anoxic pond top, and with the mud thorough mixing in the Aerobic Pond, mixed solution circulates in Aerobic Pond; Wherein a part of mixed solution is back in the anoxic pond after flow out the Aerobic Pond lower end; Another part mixed solution is expel liquid after the membrane module solid-liquid separation.Mixing speed is 50 r/min in the said anaerobic pond; Liquid portion is back to anaerobic pond in the said anoxic pond, and reflux ratio is 200%; Sludge concentration in the said Aerobic Pond is 8 g/L.Said anaerobic pond sludge concentration 20 g/L, anaerobic pond hydraulic detention time 4 h, anaerobism water outlet suspended sediment concentration 5g/L; Said anoxic pond sludge concentration 8 g/L, anoxic pond hydraulic detention time 1.5 h, anoxic water outlet suspended sediment concentration 4g/L; Said Aerobic Pond sludge concentration 6g/L; Aerobic Pond hydraulic detention time 6 h, Aerobic Pond dissolved oxygen content 2.0mg/L, Aerobic Pond to anoxic pond reflux ratio 200%.In addition, suitable kept anaerobic pond upflow velocity 2 * 10
-4M/s, anoxic pond upflow velocity 1 * 10
-4M/s, Aerobic Pond upflow velocity 6.5 * 10
-5M/s.
Be used for the device of the above-mentioned high-efficient denitrification and dephosphorization integrated technique that reduces discharging based on mud, as shown in Figure 2, this device comprises anaerobic pond 1, anoxic pond 2 and the Aerobic Pond 3 that connects successively; Be provided with whisking appliance 10 in the anaerobic pond 1; Anaerobic pond 1 lower end is provided with water inlet pipe 4, and anaerobic pond 1 upper end is provided with rising pipe 5, and the rising pipe 5 of anaerobic pond 1 goes out water pump 18 through first and is connected with first water-in 6 of anoxic pond 2 lower ends; Anoxic pond 2 upper end wall are provided with spilling water groove 11 outward; Spilling water groove 11 lower end water outlets 19 are connected with the water-in 8 of being located at Aerobic Pond 3 middle parts, are provided with flow apron 14 and aerating apparatus 16 in the Aerobic Pond 3, and membrane module 15 is positioned at aerating apparatus 16 tops; Aerobic Pond 3 lower end refluxing openings 20 are connected with second water-in 7 of anoxic pond 2 through reflux pump 13, and Aerobic Pond 3 bottoms are provided with shore pipe 9.Said anaerobic pond 1 is integral type (both are communicated with through the backflow seam 12 of lower end) with anoxic pond 2.The outlet of said membrane module 15 and second goes out water pump 17 and is connected.The lower side of said Aerobic Pond 3 and the angle of level ground are 45 degree.
Embodiment 2
A kind of high-efficient denitrification and dephosphorization integrated technique that reduces discharging based on mud, this technology is: through the sewage behind the grid filtration in the bottom gets into anaerobic pond, mud thorough mixing under agitation condition and in the anaerobic pond; The anaerobism water outlet is flowed out the back and is got into the anoxic pond from the bottom from anaerobic pond top, mix with mud in the anoxic pond; The anoxic water outlet is flowed out the back in the middle part gets into Aerobic Pond from anoxic pond top, and with the mud thorough mixing in the Aerobic Pond, mixed solution circulates in Aerobic Pond; Wherein a part of mixed solution is back in the anoxic pond after flow out the Aerobic Pond lower end; Another part mixed solution is expel liquid after the membrane module solid-liquid separation.Mixing speed is 40 r/min in the said anaerobic pond; Liquid portion is back to anaerobic pond in the said anoxic pond, and reflux ratio is 300%; Sludge concentration in the said Aerobic Pond is 5g/L.Said anaerobic pond sludge concentration 10g/L, anaerobic pond hydraulic detention time 8 h, anaerobism water outlet suspended sediment concentration 4.5g/L; Said anoxic pond sludge concentration 6g/L, anoxic pond hydraulic detention time 3 h, anoxic water outlet suspended sediment concentration 3.75g/L; Said Aerobic Pond sludge concentration 5g/L; Aerobic Pond hydraulic detention time 12 h, Aerobic Pond dissolved oxygen content 4.0mg/L, Aerobic Pond to anoxic pond reflux ratio 300%.Device is with embodiment 1.
The principle of work of technology of the present invention and device is detailed below in conjunction with Fig. 1 and Fig. 2:
1) municipal effluent is through getting in the anaerobic pond 1 from water inlet pipe 4 behind the grid filtration; Under the stirring action of whisking appliance 10, intake and fully contact with the suspended sludge layer; Organic pollutant in the waste water decomposes rapidly under the effect of anaerobic hydrolysis-acidification flora; Be converted into low molecular solvability organic acid, anaerobion is converted into the methane discharge with low molecular organic acids then, and polyP bacteria is released phosphorus at this.
2) save the sludge concentration in the anaerobism water outlet through changing whisking appliance 10 rotating speed adjustable, thus the sludge concentration in regulation and control anaerobic pond and anoxic pond two ponds.The anaerobism water outlet gets in the anoxic pond 2 through anaerobism rising pipe 5 and anoxic pond second water-in 7, and denitrifying bacteria carries out denitrification under anoxia condition, and nitric nitrogen is converted into nitrogen and discharges, and reaches the denitrogenation purpose.Anoxic pond 2 mud more than needed are back in the anaerobic pond 1 through reflux seam 12 and action of gravity.
3) the anoxic water outlet gets in the Aerobic Pond 3 from the middle part with water-in 8 through the spilling water groove 11 on anoxic pond 2 tops.Aerating apparatus 16 in the Aerobic Pond 3 plays oxygen supply and plug-flow effect, and membrane module 15 places aerating apparatus 16 tops, and the shearing action of bubble can be alleviated the aggravation that film pollutes.Internal recycle flows mixed solution in the pond under the vigorous stirring of bubble and flow apron 14 actings in conjunction in the pond; Organic pollutant further obtains decomposing in Aerobic Pond; Ammonia nitrogen is converted into nitric nitrogen under the nitrobacteria effect; PolyP bacteria is inhaled phosphorus under aerobic condition, rich phosphorated excess sludge can regularly be discharged by shore pipe 9.Partially mixed liquid in the Aerobic Pond 3 goes out under the suction function of water pump 17 to discharge second after membrane module 15 filters; (contained nitric nitrogen also is back in the anoxic pond 2 another part mixed solution in the mixed solution in effect refluxed to the anoxic pond 2 of reflux pump 13; Under the denitrification of denitrifying bacteria, being converted into nitrogen discharges); Through regulating reflux pump 13 adjustable reflux ratios size; Increase reflux ratio and can appropriateness improve the denitrification ratio, increase the clearance of total nitrogen.
Use technology according to the invention and device to carry out the municipal sewage treatment test: test water inlet is water outlet behind the grid of certain municipal sewage plant (Inlet and outlet water flow 1 day 1 ton), and the monitoring index result who handles the back water outlet sees the following form 1.Can find out that by table 1 effluent index after the processing reaches the primary standard A standard of " urban wastewater treatment firm pollutant emission standard " GB18918-2002.
Claims (7)
1. a high-efficient denitrification and dephosphorization integrated technique that reduces discharging based on mud is characterized in that, the sewage behind grid filtration gets in the anaerobic pond; Under agitation condition with anaerobic pond in mud mix; The anaerobism water outlet is flowed out the back from anaerobic pond and is got into the anoxic pond, mixes with mud in the anoxic pond, and the anoxic water outlet is flowed out in the back entering Aerobic Pond from anoxic pond; Mix with the mud in the Aerobic Pond, mixed solution circulates in Aerobic Pond; Wherein a part of mixed-liquor return is to anoxic pond; Another part mixed solution is expel liquid after the membrane module solid-liquid separation.
2. the high-efficient denitrification and dephosphorization integrated technique that reduces discharging based on mud according to claim 1 is characterized in that, mixing speed is 10～100 r/min in the said anaerobic pond; Liquid portion is back to anaerobic pond in the said anoxic pond; Sludge concentration in the said Aerobic Pond is 5～15 g/L.
3. like the said high-efficient denitrification and dephosphorization integrated technique that reduces discharging based on mud of claim 2; It is characterized in that; Mixing speed is 20～40 r/min in the said anaerobic pond; Anaerobic pond sludge concentration 2～30 g/L, anaerobic pond hydraulic detention time 1～10 h, anaerobism water outlet suspended sediment concentration 0.1～6.0g/L; Said anoxic pond sludge concentration 2～20 g/L, anoxic pond hydraulic detention time 0.5～4 h, anoxic water outlet suspended sediment concentration 0.1～6.0g/L, anoxic pond to anaerobic pond reflux ratio greater than 0 smaller or equal to 300%; Said Aerobic Pond sludge concentration 5～10 g/L, Aerobic Pond hydraulic detention time 1～20 h, Aerobic Pond dissolved oxygen content 0.5～4.0mg/L, Aerobic Pond to anoxic pond reflux ratio 100～500%.
4. like the said high-efficient denitrification and dephosphorization integrated technique that reduces discharging based on mud of claim 3, it is characterized in that said anaerobic pond sludge concentration 5～20 g/L, anaerobic pond hydraulic detention time 3～5 h; Said anoxic pond sludge concentration 5～10 g/L, anoxic water outlet suspended sediment concentration 0.1～3.0g/L, anoxic pond to anaerobic pond reflux ratio 100～300%; Said Aerobic Pond hydraulic detention time 4～8 h, Aerobic Pond dissolved oxygen content 2.0～3.0mg/L, Aerobic Pond to anoxic pond reflux ratio 200～300%.
5. be used for the device of the said high-efficient denitrification and dephosphorization integrated technique that reduces discharging based on mud of claim 2, it is characterized in that, comprise the anaerobic pond, anoxic pond and the Aerobic Pond that connect successively; Be provided with whisking appliance in the anaerobic pond, the anaerobic pond lower end is provided with the water inlet pipe upper end and is provided with rising pipe, and the anaerobic pond rising pipe is connected with the water-in of anoxic pond lower end; The anoxic pond upper end wall is provided with the spilling water groove outward; The spilling water groove is connected with the water-in of being located at the Aerobic Pond middle part, is provided with flow apron and aerating apparatus in the Aerobic Pond, and membrane module is positioned at the aerating apparatus top; Aerobic Pond lower end refluxing opening is connected with anoxic pond through reflux pump, and the Aerobic Pond bottom is provided with shore pipe.
6. like the said device that is used for based on the high-efficient denitrification and dephosphorization integrated technique of mud reduction of discharging of claim 5, it is characterized in that said anaerobic pond and anoxic pond are integral type, both are communicated with through the backflow seam of lower end; The lower side of said Aerobic Pond and the angle of level ground are 45 degree.
7. like claim 5 or the 6 said devices that are used for based on the high-efficient denitrification and dephosphorization integrated technique of mud reduction of discharging, it is characterized in that said anaerobic pond rising pipe goes out water pump through first and is connected with the water-in of anoxic pond lower end; The outlet of said membrane module and second goes out water pump and is connected.
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| CN105110573A (en) * | 2015-09-22 | 2015-12-02 | 张家港市格锐环境工程有限公司 | Treatment system and method for removing total nitrogen in sewage |
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| CN108439600A (en) * | 2018-05-28 | 2018-08-24 | 天津海之凰科技有限公司 | A kind of reinforcing coupled biological membrane reactor EHBR total nitrogen of urban sewage minimizing technologies |
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| CN110040906A (en) * | 2019-04-04 | 2019-07-23 | 智造起源科技有限公司 | A kind of enhanced high-efficient denitrification and dephosphorization sewage disposal system and treatment process |
| CN111115808A (en) * | 2020-01-14 | 2020-05-08 | 中建环能科技股份有限公司 | Sewage treatment system and method capable of cooperatively regulating and controlling reflux device and stirring device |
| CN114349273A (en) * | 2021-12-28 | 2022-04-15 | 安徽普氏生态环境工程有限公司 | Nitrogen and phosphorus removal system and process for sewage treatment |
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Application publication date: 20120627 |