CN102557343A - Process and device for treating sewage through denitrification and dephosphorization by oxic-anaerobic-anoxic-oxic (OAAO) plus membrane bioreactor (MBR) process - Google Patents
Process and device for treating sewage through denitrification and dephosphorization by oxic-anaerobic-anoxic-oxic (OAAO) plus membrane bioreactor (MBR) process Download PDFInfo
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- CN102557343A CN102557343A CN2011104473354A CN201110447335A CN102557343A CN 102557343 A CN102557343 A CN 102557343A CN 2011104473354 A CN2011104473354 A CN 2011104473354A CN 201110447335 A CN201110447335 A CN 201110447335A CN 102557343 A CN102557343 A CN 102557343A
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Abstract
The invention belongs to the field of sewage treatment, and discloses a process and a device for treating sewage through denitrification and dephosphorization by an oxic-anaerobic-anoxic-oxic (OAAO) plus membrane bioreactor (MBR) process. A pre-aerobic tank is arranged on the basis of the inverted anaerobic-anoxic-oxic (A<2>/O) process flow; and meanwhile, a membrane separation technology is used for substituting two sedimentation units of sedimentation tanks. According to the process, pre-treated sewage flows into the pre-aerobic tank, an anoxic tank and an anaerobic tank respectively; and the sewage flows into an MBR tank through the pre-aerobic tank, the anoxic tank, the anaerobic tank and an aerobic tank, is filtered by a membrane component and is drained. By the process for treating the sewage, a mixed liquor of the MBR tank can flow back to the pre-aerobic tank by arranging the pre-aerobic tank before an inverted A<2>/O process and changing influent and reflux modes, so that dissolved oxygen generated by the excess aeration of the MBR tank can be efficiently utilized; and the inverted A<2>/O process is adopted, so that the internal circulation caused by the denitrification and dephosphorization is avoided, the internal circulation volume of the mixed liquor is reduced, and the operation and maintenance cost which is required by the internal circulation is correspondingly reduced. The water quality of effluent treated by the method meets the requirements of I-class A criteria of Integrated Wastewater Discharge Standard (GB 8978-1996).
Description
Technical field
The invention belongs to sewage treatment area.
Background technology
The deterioration of water resources, shortage of energy sources and quality of water environment becomes the bottleneck of socio-economic development day by day, and the denitrogenation dephosphorizing usefulness, the reduction WWT energy consumption that improve wastewater treatment rate and degree of treatment, reinforcement sewage work become the task of top priority.Along with the raising of sewage disposal plant effluent water quality, the existing insufficient phenomenon of sewage work's ubiquity carbon source.How to improve existing sewage treatment process carbon source efficient utilization, reduce Pollutant levels in the water outlet, be the current difficult problem that need solve.
Membrane Bio-reactor Technology (MBR) is the product that membrane separation technique and dirty water living creature processing technique organically combine; This technology replaces the muddy water gravity settling separation process in the traditional active sludge treating processes with ultra, microfiltration membrane sepn process; Owing to adopt membrane sepn, can keep very high biota concentration and very excellent water outlet effect.This technology has advantages such as effluent quality is good, floor space is little, excess sludge discharge is few, not influenced by the mud expansible, capacity of resisting impact load is strong, level of automation is high, and operational management is easy, is the sewage disposal technology that has development potentiality.
But membrane Bio-reactor Technology (MBR) is because its energy consumption is big, equipment price is high, seriously limited applying of it to controlling shortcoming such as strict.As be the pollution on controlling diaphragm surface, need to adopt the mode of blast aeration that the film surface is purged, GWR is 10:1 ~ 20:1 in the general membrane cisterna, causes the membrane cisterna energy consumption to strengthen.
If can the traditional activated sludge process treatment process be combined with the MBR membrane separation technique, can improve effluent quality on the one hand, also can save floor space on the other hand, have application prospects, received investigator's concern at present.But because the high GWR of MBR membrane cisterna; Its mixed solution dissolved oxygen concentration is up to 5.0mg/L ~ 10.0mg/L; If it is not carried out scientific utilization; Not only waste the energy consumption of blast aeration, but also will consume available carbon source in a large amount of sewage, be unfavorable for improving the water outlet effect of a whole set of Sewage treatment systems.
Therefore, should develop one and overlap MBR membrane treatment process flow process and method high-effect, less energy-consumption.
Summary of the invention
The present invention will solve the technical problem that carbon source in the traditional activated sludge process sewage treatment process is effectively utilized and existing MBR membrane bioreactor exists aspect energy consumption, proposed that a kind of energy consumption is low, the OAAO+MBR denitrogenation dephosphorizing sewage treatment process and the device of saving carbon source.
The present invention combines the characteristics of MBR technology, the traditional waste water treatment process flow process is reformed, at inversion A
2Increase by an Aerobic Pond before the/O technology, the dissolved oxygen that the excessive aeration of MBR membrane cisterna is produced efficiently utilizes further; Change single-point water intake mode traditional in the biochemistry pool simultaneously, thereby improve the effective rate of utilization of carbon source in the water inlet, then with the sewage treatment process of improvement preposition aerobic+inversion A
2/ O (OAAO) technology and MBR process combination are utilized membrane module high efficiency separation function, obtain good effluent quality.
Technical scheme of the present invention is following:
A kind of OAAO+MBR denitrogenation dephosphorizing sewage treatment process; Its device comprises successively preface contact each other logical preposition Aerobic Pond, anoxic pond, anaerobic pond, Aerobic Pond and MBR membrane cisterna, and preposition Aerobic Pond is provided with first sewage water inlet pipe of band variable valve, and the MBR membrane cisterna is provided with the MBR membrane module; The water outlet of MBR membrane module connects rising pipe; The MBR membrane cisterna is provided with the mud relief outlet, it is characterized in that: anoxic pond is provided with second sewage water inlet pipe of band variable valve, and anaerobic pond is provided with band variable valve the 3rd sewage water inlet pipe; The return line that reflux pump is housed is connected the MBR membrane cisterna logical with preposition Aerobic Pond.
Sewage treatment process is: get into preposition Aerobic Pond, anoxic pond and anaerobic pond from first, second and the 3rd sewage water inlet pipe respectively through pretreated sewage; Clear water after the MBR membrane module filters is discharged through rising pipe from its water outlet, and the mud relief outlet of mud from the MBR membrane cisterna discharged; Wherein, MBR membrane cisterna mixed-liquor return to preposition Aerobic Pond, its quantity of reflux is 3 ~ 5 times of sewage water inlet total amount.
The mean concns of mud is 5～7g/L in preposition Aerobic Pond, anoxic pond, anaerobic pond, the Aerobic Pond, and the mean concns of mud is 7～9g/L in the MBR membrane cisterna, and total hrt is 10～20 hours.
The present invention has following outstanding substantive distinguishing features and marked improvement:
1. treatment process of the present invention has been broken the conventional thought of denitrogenation dephosphorizing flow process, before Aerobic Pond is put, with in the mixed-liquor return in the MBR membrane cisterna to the preposition Aerobic Pond, so can make full use of the dissolved oxygen in the membrane cisterna simultaneously, reduces the blast aeration amount in the Aerobic Pond;
2. the present invention takes the multipoint water feeding mode, and sewage divides get into each biochemical reaction tank at 3 after the pre-treatment soon, can make full use of the carbon source in the sewage, is respectively denitrifying bacteria and dephosphorization bacterial efficient available high-quality carbon source is provided; Simultaneously owing to adopt inversion A
2/ O technology has been avoided the internal recycle of denitrogenation and dephosphorization, has reduced the required operation and maintenance cost of internal recycle.
Description of drawings
Fig. 1 is device of the present invention and method of use synoptic diagram thereof.
Among the figure: 1-preposition Aerobic Pond; 2-anoxic pond; 3-anaerobic pond; 4-Aerobic Pond; 5-MBR membrane cisterna; 6-MBR membrane module; 7-aerating apparatus; 8-water shoot; 81-wet-pit; 9-water inlet pipe; 91-main intake pump; 10-the first water transport port; 11-the first sewage water inlet pipe; 12-the first water intaking valve; 13-return line; 14-reflux pump; 20-the second water transport port; 21-the second sewage water inlet pipe; 22-the second water intaking valve; 30-the three water transport port; 31-the three sewage water inlet pipe; 32-the three water intaking valve; 40-the four water transport port.
Embodiment
Below in conjunction with accompanying drawing the present invention is described further.
Fig. 1 is OAAO+MBR denitrogenation dephosphorizing sewage treatment process provided by the invention and device synoptic diagram.
As shown in Figure 1, OAAO+MBR denitrogenation dephosphorizing waste disposal plant provided by the invention, it comprises successively preface contact each other logical preposition Aerobic Pond 1, anoxic pond 2, anaerobic pond 3, Aerobic Pond 4 and MBR membrane cisterna 5; Preposition Aerobic Pond 1 is communicated with by first water transport port 10 with anoxic pond 2; Anoxic pond 2 is communicated with by second water transport port 20 with anaerobic pond 3, and anaerobic pond 3 is communicated with by the 3rd water transport port 30 with Aerobic Pond 4, and Aerobic Pond 4 is communicated with by the 4th water transport port 40 with MBR membrane cisterna 5; MBR membrane cisterna 5 is provided with MBR membrane module 6 and aerating apparatus 7; The water outlet of MBR membrane module 6 connects rising pipe 8, and rising pipe 8 is provided with wet-pit 81, and MBR membrane cisterna 5 is provided with the mud relief outlet.
First sewage water inlet pipe 11, second sewage water inlet pipe 21 and the 3rd sewage water inlet pipe 31 are connected to main water inlet tube 9; Main water inlet tube 9 is connected with the leading portion polluted water pretreatment apparatus through main intake pump 91;
The other end of first sewage water inlet pipe 11 is connected to preposition Aerobic Pond 1, the first sewage water inlet pipe 11 and is provided with first water intaking valve 12;
The other end of second sewage water inlet pipe 21 is connected to anoxic pond 2, the second sewage water inlet pipes 21 and is provided with second water intaking valve 22;
The other end of the 3rd sewage water inlet pipe 31 is connected to anaerobic pond 3, the three sewage water inlet pipes 31 and is provided with the 3rd water intaking valve 32;
The return line 13 that reflux pump 14 is housed is connected MBR membrane cisterna 5 logical with preposition aerobic 1 pond.
Described preposition Aerobic Pond 1, anoxic pond 2, anaerobic pond 3, Aerobic Pond 4 and MBR membrane cisterna 5 constitute by one or more unit cells.
Concrete operation scheme of the present invention is:
Respectively from first sewage water inlet pipe 11, second sewage water inlet pipe 21 and three sewage water inlet pipe 31 get into preposition Aerobic Pond 1, anoxic pond 2 and anaerobic pond 3 with main intake pump 91 through main water inlet tube 9 minutes three tunnel through the leading portion pretreated sewage; Its water inlet ratio can be respectively regulated through first water intaking valve 12, second water intaking valve 22 and the 3rd water intaking valve 42, and the flow direction of sewage is: the 6 → water outlet of preposition Aerobic Pond 1 → anoxic pond 2 → anaerobic pond 3 → Aerobic Pond 4 → MBR membrane cisterna 5 → membrane module; Clear water is discharged through water shoot 8 through wet-pit 81 from the water outlet of membrane module 6, and mud is discharged by the mud relief outlet of MBR membrane cisterna 5.
Starting reflux pump 14 simultaneously makes the partially mixed liquid of MBR membrane cisterna 5 be back to preposition Aerobic Pond 1 through return line 13; In this process; Preposition Aerobic Pond 1 makes full use of the mixed solution of the MBR membrane cisterna 5 that is back to this pond; Reduced on the one hand the blast aeration amount of preposition Aerobic Pond 1, the dissolved oxygen that on the other hand the excessive aeration of MBR membrane cisterna 5 is produced makes full use of; Simultaneously, in preposition Aerobic Pond 1, nitration reaction has taken place, the ammonia nitrogen in the sewage is converted into nitric nitrogen; Afterwards; Mixed solution in the preposition Aerobic Pond 1 gets into anoxic pond 2 through first water transport port 10; The carbon source of denitrifying bacteria utilization in the sewage that 21 conveyings of second sewage water inlet pipe are come in carried out denitrification in anoxic pond 2; With the nitrate salt denitrification in this pond body is the removal that nitrogen is realized nitrogen, is that polyP bacteria is created good living environment in the anaerobic pond 3 of back simultaneously; Mixed solution in the anoxic pond 2 gets into anaerobic pond 3 through second water transport port 20; PolyP bacteria absorbs the organism in 31 water inlets of the 3rd sewage water inlet pipe and synthesizes PHAs and is stored in the cell in anaerobic pond 3; Discharge orthophosphoric acid salt simultaneously, this moment, organonitrogen also was converted into ammonia nitrogen; Then the mixed solution in the anaerobic pond 3 gets into Aerobic Pond 4 through the 3rd water transport port 30; Nitrifier in the Aerobic Pond 4 is converted into nitric nitrogen with ammonia nitrogen; The while polyP bacteria is utilized in the interior PHAs of the cell that stores in the anaerobic pond 3 and absorbs the phosphoric acid salt in the mixed solution in a large number; Realize the removal of phosphor in sewage, the organism in this sewage also is able to degraded and removes; Mixed solution gets into MBR membrane cisterna 5 through the 4th water transport port 40 in the Aerobic Pond 4; At this; Mixed solution water outlet after membrane module 6 filters, clear water is discharged through water shoot 8 through wet-pit 81 from MBR membrane cisterna 5, and mud is discharged by the mud relief outlet of MBR membrane cisterna 5; Satisfy the metabolic demand of mikrobe in the mud, realize the high-efficiency activated of mud in a whole set of treatment system.
By MBR membrane cisterna 5 mixed-liquor returns to the quantity of reflux of preposition Aerobic Pond 1 is 3 ~ 5 times of flooding quantity, and the mean concns of mud is 5～7g/L in preposition Aerobic Pond 1, anoxic pond 2, anaerobic pond 3, the Aerobic Pond 4, and the mean concns of mud is 7～9g/L in the MBR membrane cisterna 5.
As a concrete application example, the handled former water of the present invention is the Guangzhou municipal effluent, is 4 times of sewage water inlet total amount by MBR membrane cisterna 5 mixed-liquor returns to the quantity of reflux of preposition Aerobic Pond 1, and hydraulic detention time is 14h.Handle forward and backward water quality data see the following form (mg/L):
| ? | COD | BOD | SS | TN | TP | NH 3-N |
| Water inlet (before handling) | 200~400 | 150~250 | 150~250 | 30~45 | 4~7 | 25~40 |
| Water outlet (handling the back) | 50 | 20 | 5 | 7.5 | 0.4 | 1.5 |
Effluent quality is superior to one-level A standard.
Claims (2)
1.OAAO+MBR the device of denitrogenation dephosphorizing sewage treatment process; Comprise preposition Aerobic Pond (1), anoxic pond (2), anaerobic pond (3), Aerobic Pond (4) and MBR membrane cisterna (5) that preface is successively contacted logical each other; Preposition Aerobic Pond (1) is provided with first sewage water inlet pipe (11) of band variable valve; MBR membrane cisterna (5) is provided with MBR membrane module (6), and the water outlet of MBR membrane module (6) connects rising pipe (8), and MBR membrane cisterna (6) is provided with the mud relief outlet; It is characterized in that: anoxic pond (2) is provided with second sewage water inlet pipe (21) of band variable valve, and anaerobic pond (3) is provided with the 3rd sewage water inlet pipe (31) of band variable valve; The return line (13) that reflux pump is housed is connected MBR membrane cisterna (5) logical with preposition Aerobic Pond (1).
2.OAAO+MBR denitrogenation dephosphorizing sewage treatment process; Its device comprises preposition Aerobic Pond (1), anoxic pond (2), anaerobic pond (3), Aerobic Pond (4) and the MBR membrane cisterna (5) that preface is successively contacted logical each other; Preposition Aerobic Pond (1) is provided with first sewage water inlet pipe (11) of band variable valve; MBR membrane cisterna (5) is provided with MBR membrane module (6), and the water outlet of MBR membrane module (6) connects rising pipe (8), and MBR membrane cisterna (5) is provided with the mud relief outlet; It is characterized in that: anoxic pond (2) is provided with second sewage water inlet pipe (21) of band variable valve, and anaerobic pond (3) is provided with the 3rd sewage water inlet pipe (31) of band variable valve; The return line (13) that reflux pump is housed is connected logical (1) with MBR membrane cisterna (5) with preposition Aerobic Pond; Get into preposition Aerobic Pond (1), anoxic pond (2) and anaerobic pond (3) from first sewage water inlet pipe (11), second sewage water inlet pipe (21) and the 3rd sewage water inlet pipe (31) respectively through pretreated sewage; Clear water after MBR membrane module (6) filters is discharged through rising pipe (8) from the water outlet of MBR membrane module (6), and mud is discharged from the mud relief outlet of MBR membrane cisterna (5); MBR membrane cisterna (5) mixed-liquor return to preposition Aerobic Pond (1); Its quantity of reflux is 3 ~ 5 times of sewage water inlet total amount; The mean concns of mud is 5～7g/L in preposition Aerobic Pond (1), anoxic pond (2), anaerobic pond (3), the Aerobic Pond (4); The mean concns of mud is 7～9g/L in the MBR membrane cisterna (5), and total hrt is 10～20 hours.
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| CN104003575A (en) * | 2014-05-22 | 2014-08-27 | 广州嘉康环保技术有限公司 | River branch water treatment system and method |
| CN104118969A (en) * | 2014-07-08 | 2014-10-29 | 广州市市政工程设计研究院 | A2O(anaerobic-anoxic-oxic)-MBR (membrane bioreactor) sewage treatment device and method |
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