CN202729946U - Two-stage anoxic/oxic (A/O)-membrane biological reactor (MBR) nitrogen and phosphorus removal device - Google Patents

Abstract

The utility model discloses a two-stage anoxic/oxic (A/O)-membrane biological reactor (MBR) nitrogen and phosphorus removal device. The nitrogen and phosphorus removal device comprises an anaerobic tank, a first anoxic tank, a first oxic tank, a second anoxic tank, a second oxic tank and a membrane tank, which are sequentially communicated, wherein the anaerobic tank and the second anoxic tank are respectively communicated with a water inlet pipe; a water inlet pump is arranged on the water inlet pipe; a membrane component is arranged in the membrane tank and communicated with a water outlet pipe; a water outlet pump is arranged on the water outlet pipe; a sedimentation tank is arranged at the bottom of the membrane tank and communicated with the anaerobic tank through a sludge mixed liquid backflow pipe; and a backflow pump is arranged on the sludge mixed liquid backflow pipe. By the adoption of the nitrogen and phosphorus removal device, pollutant such as organic matters, nitrogen and phosphorus in sewage can be well removed, and the operating energy consumption of an MBR process can be reduced, so the nitrogen and phosphorus removal device is applicable to the treatment of town domestic sewage.

Description

A kind of two-stage A/O-MBR denitrification dephosphorization apparatus

Technical field

The utility model relates to a kind of denitrification dephosphorization apparatus, is specifically related to a kind of two-stage A/O that uses film-bioreactor-MBR denitrification dephosphorization apparatus.

Background technology

Contain a large amount of nitrogen and phosphorus pollution materials in the municipal effluent, enter the unhurried current water bodys such as lake, reservoir, river mouth, bay when sewage after, nitrogen, phosphorus accumulate gradually, make particularly algal bloom of hydrobiont, finally cause the water ecology balance to be seriously damaged, so-called eutrophication phenomenon namely occurs.Eutrophication not only can be destroyed the original ecosystem of water body, also can cause great financial loss to fishery, aquaculture etc., when serious even jeopardize human health.In order effectively to contain body eutrophication, strict nitrogen, phosphorus emission standard have been formulated in increasing countries and regions.But traditional sewage treatment process is because existence is to the contradiction of carbon source demand between denitrogenation and dephosphorization, and water outlet nitrogen, phosphorus concentration are difficult to simultaneously up to standard, and this is so that sewage denitrification and dephosphorization becomes focus and the difficult point of sewage treatment area.

MBR is a kind of Novel sewage treatment and reuse technique that membrane separation technique and biological processing unit is combined.This technique is because the efficient membrane sepn of employing substitutes the second pond in the conventional activated sludge process, and solid-liquid separation efficiency is high, and water outlet is good and stable, but direct reuse; The microbial biomass that can keep high density in the reactor, the processing volume load is high, small accommodation area; The excess sludge generation is little; Convenient operation and management, level of automation is high.In view of the advantage of MBR, set up MBR sewage disposal and the wsates resources project of considerable scale and quantity both at home and abroad.Therefore MBR can improve the processing power of system owing to can move under high sludge concentration, but it is unfavorable to film pollution control to cross high sludge concentration, needs higher aeration energy consumption to come controlling diaphragm to pollute.

Sewage denitrification and dephosphorization and reduction system operation energy consumption are important applied field and the developing direction of MBR, and owing to complicated mechanism, influence factor is numerous, and the existing independently denitrogenation dephosphorizing of investigation MBR or energy-saving and cost-reducing of studying mostly is difficult to both and takes into account.Part Study adopts the mode of additional carbon to improve simultaneously Nitrogen/Phosphorus Removal, but owing to having increased complexity and the running cost of technique, is not suitable for large-scale promotion.Research is arranged by using A ²O technique denitrification dephosphorization technology makes denitrogenation and dephosphorization can share a part of carbon source, can alleviate to a certain extent both contradiction, but its effect is still limited, and denitrification effect is undesirable when the reply low carbon-nitrogen ratio sewage.The endogenous denitrification of employing technology is also arranged, utilize the intracellular organic matter of microorganism as carbon source, need not the carbon source in the sewage, thereby be highly suitable for the denitrogenation dephosphorizing processing of the limited municipal effluent of common carbon source content, this technical stability also need be optimized.Energy-conservation aspect mainly reaches energy-saving and cost-reducing purpose with optimization film group device structure, the more efficient aeration mode of exploitation.

The utility model content

Can not effectively remove nitrogen in the sewage and the deficiency of phosphorus in order to overcome traditional waste water treatment process, the purpose of this utility model provides a kind of two-stage A/O-MBR denitrification dephosphorization apparatus, when utilizing this device to carry out denitrogenation dephosphorizing, can can not need additionally to add under the condition of carbon source for low carbon-nitrogen ratio sewage, carrying out high-efficient denitrification and dephosphorization processes, and technique is simple, and operation energy consumption is lower than traditional MBR, and water outlet can reach national reuse water standard.

A kind of two-stage A/O provided by the utility model-MBR denitrification dephosphorization apparatus comprises the anaerobic pond, the first anoxic pond, the first Aerobic Pond, the second anoxic pond, the second Aerobic Pond and the membrane cisterna that are communicated with successively;

Described anaerobic pond and the second anoxic pond all are connected with water inlet pipe, and described water inlet pipe is provided with intake pump;

Be provided with membrane module in the described membrane cisterna, described membrane module is connected with rising pipe, and described rising pipe is provided with out water pump; The bottom of described membrane cisterna is provided with settling tank, and described settling tank is connected with described anaerobic pond by the mud mixed liquid return line, and described mud mixed liquid return line is provided with reflux pump.

In above-mentioned two-stage A/O-MBR denitrification dephosphorization apparatus, described water inlet pipe is provided with flow control valve, enters the ratio that enters in described anaerobic pond and the second anoxic pond with adjusting.

In above-mentioned two-stage A/O-MBR denitrification dephosphorization apparatus, described settling tank can be the back taper bodily form, is beneficial to the sedimentation of mud mixed liquid.

In above-mentioned two-stage A/O-MBR denitrification dephosphorization apparatus, be provided with whipping appts in described anaerobic pond, the first anoxic pond and the second anoxic pond.

In above-mentioned two-stage A/O-MBR denitrification dephosphorization apparatus, be provided with aeration oxygenator in described the first Aerobic Pond, the second Aerobic Pond and the membrane cisterna.

In above-mentioned two-stage A/O-MBR denitrification dephosphorization apparatus, described anaerobic pond, the first anoxic pond, the first Aerobic Pond, the second anoxic pond, the second Aerobic Pond and membrane cisterna all can be comprised of one or more unit cells.

The two-stage A/O that the utility model provides-MBR denitrification dephosphorization apparatus, have following advantage: the utility model combines two-stage A/O with MBR, traditional MBR technique has good deammoniation nitrogen ability, can the ammonia nitrogen of sewage kind is fully nitrated, and two-stage A/O system has stronger denitrifying capacity, and both to the total nitrogen degradation capability, are fit to the processing of low carbon-nitrogen ratio sewage in conjunction with the raising system, it is strong that system's total nitrogen is removed ability, can guarantee that the water outlet total nitrogen obviously is better than other traditional technologys; By designing the settling region at membrane cisterna, can reduce the sludge concentration that enters the membrane separation zone mixed solution, reduce the membrane module working load, owing to having reduced the sludge concentration in membrane module zone, run duration can suitably reduce the aeration intensity of membrane module, reduces the operation energy consumption of MBR system.

Description of drawings

The two-stage A/O-MBR denitrification dephosphorization apparatus that Fig. 1 provides for the utility model.

Each mark is as follows among the figure: 1 anaerobic pond, 2 first anoxic pond, 3 first Aerobic Ponds, 4 second anoxic pond, 5 second Aerobic Ponds, 6 membrane cisternas, 7 water inlet pipes, 8 intake pumps, 9 flow control valves, 10 membrane modules, 11 rising pipes, 12 settling tanks, 13 mud mixed liquid return lines, 14 reflux pumps, 15 aeration oxygenators, 16 go out water pump.

Embodiment

Employed experimental technique is ordinary method if no special instructions among the following embodiment.

Used material, reagent etc. if no special instructions, all can obtain from commercial channels among the following embodiment.

The two-stage A/O that the utility model provides-MBR denitrification dephosphorization apparatus comprises anaerobic pond 1, the first anoxic pond 2, the first Aerobic Pond 3, the second anoxic pond 4, the second Aerobic Pond 5 and the membrane cisterna 6 that is communicated with successively; Wherein anaerobic pond 1 and the second anoxic pond 4 all are connected with water inlet pipe 7, and this water inlet pipe 7 is provided with intake pump 8 and flow control valve 9, enter the ratio that enters in anaerobic pond 1 and the second anoxic pond 4 with adjusting; Be provided with membrane module 10 in the membrane cisterna 6, this membrane module 10 is connected with rising pipe 11, and rising pipe 11 is provided with out water pump 16, and the water after purifying is discharged; The bottom of membrane cisterna 6 is provided with the settling tank 12 of the back taper bodily form, can be beneficial to the sedimentation of mud mixed liquid; This settling tank 12 is connected with anaerobic pond 1 by mud mixed liquid return line 13, and this mud mixed liquid return line 13 is provided with reflux pump 14, is used for mud mixed liquid is pumped to anaerobic pond 1; Be equipped with whipping appts 14 in anaerobic pond 1, the first anoxic pond 2 and the second anoxic pond 4; Be equipped with aeration oxygenator 15 in the first Aerobic Pond 3, the second Aerobic Pond 5 and the membrane cisterna 6.

In the denitrification dephosphorization apparatus that the utility model provides, anaerobic pond 1, the first anoxic pond 2, the first Aerobic Pond 3, the second anoxic pond 4, the second Aerobic Pond 5 and membrane cisterna 6 all can be comprised of a plurality of unit cells.

When the denitrification dephosphorization apparatus that uses the utility model to provide carries out sewage disposal, its flow process is as follows: sewage enters anaerobic pond 1 through intake pump 8, organic substrates in the sewage is absorbed by polyP bacteria and synthesizes PHAs and is stored in the born of the same parents, polyP bacteria discharges the solvability orthophosphoric acid salt simultaneously, and the COD that shows as supernatant liquor reduces and the phosphorus concentration rising.In anaerobic pond 1, organonitrogen also is converted into ammonia nitrogen.Sewage enters the first anoxic pond 2 afterwards, denitrifying bacteria utilizes sewage carbon source that mud mixed liquid return line 13 is carried out denitrification denitrogenation from the nitrate that settling tank 12 transports, Denitrifying Phosphate Accumulating Organisms can utilize intracellular PHA s to carry out denitrification dephosphorization herein simultaneously, removes part nitrate and phosphorus.Sewage enters the first Aerobic Pond 3 and the second anoxic pond 7 successively afterwards.Partial raw water directly enters the second anoxic pond 7 through former moisture flow pipe 12 in this technical process, and denitrifying bacteria utilizes sewage carbon source that the nitrate that the first Aerobic Pond produces is carried out denitrification denitrogenation.Sewage mixes again, and gravity flow enters the second aerobic zone, in this stage, polyP bacteria utilizes intracellular PHA s to absorb rapidly and removes deliquescent phosphorus, COD is because the effect of aerobic microbiological continues minimizing, the Simultaneous Nitrification bacterium is nitrite nitrogen and nitrate nitrogen with mineralized nitrogen, through after above a series of biochemical reactions, the nitrogen in the sewage, phosphorus and other pollution substance are removed substantially.And last mixed solution enters membrane cisterna 6, and membrane cisterna 6 sludge concentrations are higher, set settling tank 12 at membrane cisterna 6, part mud is back to front-end process through precipitating after concentrated, reduce the membrane cisterna sludge concentration by the mud concentrating return-flow, reduce the aeration intensity that controlling diaphragm pollutes, reduce operation energy consumption; Membrane cisterna 6 then plays the effect of further guarantee water quality, holds back by film and separates the pollution substance of removing the suspended states such as colloid phosphorus, finally through going out water pump 16 suction drainings, obtains to satisfy the water outlet of national reuse standard.

In above-mentioned treating processes, the sewage quality condition is: COD content is 200 to 300mg/L, and total nitrogen content is 80 to 100mg/L, and total phosphorous is 5 to 10mg/L.The mud mixed liquid reflux ratio of mud mixed liquid return line can be 200%, and sludge concentration is 5g/L, and hydraulic detention time is 17 hours.The project influent COD: TN ≈ 3:1, water outlet COD content are less than 30mg/L, and water outlet TN content is less than 10mg/L, and final outflow water reaches national reuse standard.

The utility model is only established a mud mixed liquid return line, and quantity of reflux can be adjusted according to needs.Reflux ratio is generally 100%-400%; The utility model is established two water inlet pipes, i.e. 2 water inlets, part of contaminated water directly enters anaerobic pond by water inlet pipe, organic substrates in the water inlet is absorbed by polyP bacteria and synthesizes PHAs and is stored in the born of the same parents, polyP bacteria discharges the solvability orthophosphoric acid salt simultaneously, and the COD that shows as supernatant liquor reduces and the phosphorus concentration rising; The isocon of another part sewage by water inlet pipe surmounts part the first anoxic pond and the first Aerobic Pond directly enters the second anoxic pond, and the nitre nitrogen that produces for the first Aerobic Pond carries out denitrification provides carbon source.

The utility model is provided with settling tank at membrane cisterna, after high-concentration activated sludge enters membrane cisterna, can be because the muddy water difference in specific gravity, part mud will sink to settling tank, mud is in the concentrated compacting of funnelform settling tank, can improve sludge reflux efficient, while part mud is concentrated rear backflow and can reduces the membrane cisterna sludge concentration.The low sludge concentration of membrane cisterna can reduce the potentiality that film pollutes, and equally also can suitably reduce the film aeration intensity, reaches energy-conservation purpose.

Claims (6)

1. two-stage A/O-MBR denitrification dephosphorization apparatus is characterized in that: described denitrification dephosphorization apparatus comprises anaerobic pond, the first anoxic pond, the first Aerobic Pond, the second anoxic pond, the second Aerobic Pond and the membrane cisterna that is communicated with successively;

Described anaerobic pond and the second anoxic pond all are connected with water inlet pipe, and described water inlet pipe is provided with intake pump;

Be provided with membrane module in the described membrane cisterna, described membrane module is connected with rising pipe, and described rising pipe is provided with out water pump; The bottom of described membrane cisterna is provided with settling tank, and described settling tank is connected with described anaerobic pond by the mud mixed liquid return line, and described mud mixed liquid return line is provided with reflux pump.

2. two-stage A/O-MBR denitrification dephosphorization apparatus according to claim 1, it is characterized in that: described water inlet pipe is provided with flow control valve.

3. two-stage A/O-MBR denitrification dephosphorization apparatus according to claim 1 and 2, it is characterized in that: described settling tank is the back taper bodily form.

4. two-stage A/O-MBR denitrification dephosphorization apparatus according to claim 1 and 2 is characterized in that: be provided with whipping appts in described anaerobic pond, the first anoxic pond and the second anoxic pond.

5. two-stage A/O-MBR denitrification dephosphorization apparatus according to claim 1 and 2 is characterized in that: be provided with aeration oxygenator in described the first Aerobic Pond, the second Aerobic Pond and the membrane cisterna.

6. two-stage A/O-MBR denitrification dephosphorization apparatus according to claim 1 and 2, it is characterized in that: described anaerobic pond, the first anoxic pond, the first Aerobic Pond, the second anoxic pond, the second Aerobic Pond and membrane cisterna form by one or more unit cells.