CN101289248A - Operation method of non-anaerobic segment biological dephosphorization of sequencing batch reactor - Google Patents

Abstract

The invention relates to an operation method of biological phosphorus removal without anaerobic section in a sequencing batch reactor, which is use for the treatment of waste water containing phosphorus. The method adopts the general sequencing batch reactor and includes the steps that sewage first enters the SBR and aerobic aeration is conducted directly to the sewage; the concentration of the dissolved oxygen in the SBR is 6mg/L at the beginning of the aerobic aeration and the pH value is adjusted to be 7.5 by NaHCO3 and 0.5 M HCl; the aerobic aeration lasts for 4h and then is completed; the solution is settled for about 0.5h, so as to separate the water and the sludge; the water power staying time in the reactor is about 12h; sludge is discharged and the active sludge concentration in the reactor is about 4000 mg/L, and the sludge age is about 7d; finally the reactor is kept still for about 7h. The method adopts no anaerobic section or anaerobic zone and realizes the synchronous removal of organism and phosphorus by direct oxidation, thus being applicable to the treatment of sewage containing phosphorus compound, particularly city domestic sewage containing phosphorus compound with low concentration and reducing the construction and operating costs of the sewage treatment.

Description

The operation method of sequencing batch reactor non-anaerobic segment biological dephosphorization

Technical field

The present invention relates to the treatment process of phosphorus-containing wastewater, belong to technical field of sewage in the environment protection.

Technical background

Because the increase day by day of industrial and agricultural production development and population, the water resources of China is suffering the pollution of all contaminations, wherein the body eutrophication problem that causes of the excessive emissions of nitrogen and phosphorus is more and more serious, hydrobiont and HUMAN HEALTH has been caused serious harm.In general, the main component that causes the body eutrophication phenomenon has tens kinds of elements such as organic carbon, nitrogen, phosphorus, potassium, iron, wherein organic carbon is easy to handle, and the demand of other composition in the eutrophication generating process is extremely low beyond the dephosphorization, nitrogen, can not become the restricted factor.Therefore, the principal element that causes eutrophication is phosphorus and nitrogen.More strictly speaking, because the blue-green algae of existence such as Anabaenopsis, Circularis and Gloctrichic echinufate in the water body can be replenished nitrogen by nitrogen fixation.So phosphorus can become the limiting factor of algae proliferation, it is particularly important to preventing body eutrophication to remove phosphorus too much in the water body.

Traditional biological phosphate-eliminating theory is thought, biological phosphate-eliminating mainly by polyP bacteria under anaerobic in the hydrolysis cellular plasm polymeric phosphate (poly-P) discharge phosphorus, excess ingestion phosphorus under the condition of aerobic, and the approach of getting rid of rich phosphorus sludge reaches the purpose of dephosphorization.PolyP bacteria belongs to facultative heterotrophic organism, in anaerobic environment and do not have DO and a large amount of NO ₃ ^-Under the prerequisite that exists, polyP bacteria is hydrolyzed into orthophosphoric acid salt with the acquisition energy with poly-phosphorus in the cell, and utilizes the organism of easily degrading in the sewage, and as voltaile fatty acid (VFAs), synthetic many β of ergastic substances hydroxy alkanoic acid salt (PHA) is stored in the cell; In aerobic environment, polyP bacteria is electron acceptor(EA) with the free oxygen, the PHA that stores in the oxidation cell, and the energy that utilizes this reaction to produce, excessive phosphoric acid salt, the high-energy synthetic substance A TP of from sewage, absorbing, wherein a part is converted into poly-phosphorus, is stored in the cell as energy matter.Because therefore the phosphorus that the phosphorus that aerobic environment absorbs down discharges down much larger than anaerobic environment can reach biological phosphate-eliminating efficiently by discharging rich phosphorus sludge.The representational biological phosphate-eliminating technology of setting up on the basis of this biological phosphate-eliminating theory is A/O technology (Anaerobic/Oxic).In recent years, the biological phosphate-eliminating theory has had new development, found denitrification phosphorus-collecting bacterium (DNPAOs-denitrifying phosphate-accumulatingorganisms), this class polyP bacteria not only can be with oxygen as the poly-phosphorus of electron acceptor(EA), and under anoxia condition, can replace dissolved oxygen to gather phosphorus with nitrate as electron acceptor(EA), simultaneously nitrate reduction is become N ₂Or nitride, and then denitrifying phosphorus removal technique appearred, but discovery of denitrification phosphorus-collecting bacterium and traditional dephosphorization theory be contradiction not, nitrate depends on the occasion that nitrate occurs to the influence of biological phosphate-eliminating, if nitrate appears at anaerobic zone, must influence polyP bacteria because of the contention carbon source and release phosphorus; Nitrate appears at polyP bacteria and fully releases after the synthetic PHA of phosphorus, then can provide electron acceptor(EA) for the synthetic poly-phosphorus of polyP bacteria oxidation PHA.No matter be traditional dephosphorization process or up-to-date dephosphorization research, in reaction process, all set up the anaerobism section, polyP bacteria is at the poly-phosphorus of anaerobism section hydrolysis, be discharged in the water with phosphatic form, obtain energy simultaneously the voltaile fatty acid of easily degrading in the sewage is synthesized PHA with the energy substance as follow-up aerobic section.Traditional studies show that, the anaerobism section is the requisite stage of biological phosphate-eliminating, and the synthetic PHA's of anaerobism section is many more, and the outputted aerobic water phosphorus concentration is low more; Do not have the anaerobism section in the reaction process, do not have a large amount of generations of PHA, just can not realize biological phosphate-eliminating.Even with the VFA of dephosphorization bacterial preference as nutrition, many investigators all can not realize effective removal of phosphorus in single-stage aerobic activated sludge technology, and the clearance of most of municipal sewage plants phosphorus of employing conventional activated sludge process is only 20～30%, except that microorganism normal growth and the metabolic phosphorus that is absorbed, almost there is not the excessive absorption of phosphorus.The relevant patent of invention that relates to denitrogenation dephosphorizing that retrieves from State Intellectual Property Office of the People's Republic of China has 87 more than, but the technology, device or the operation method that relate to biological phosphate-eliminating have all been set up anaerobism section or anaerobic zone in reaction process, as the inversion A AO waste water treatment process that 1. feeds intake, publication number CN1607190, open day 2003.10.14; 2. a kind of method of domestic sewage denitrifying-dephosphorizing and device, publication number CN1709810, an open day 2005.05.27; 3. a kind of buried under earth type sewage treatment equipment and this device thereof are handled the sanitary sewage method, publication number CN101113064, open day 2008.01.30 etc.

Summary of the invention

The objective of the invention is, defective at the prior art existence, a kind of operation method of sequencing batch reactor non-anaerobic segment biological dephosphorization is provided, it is with traditional sequencing batch reactor (SBR) Removal of Phosphorus in Wastewater, do not establish anaerobism section or anaerobic zone in the reaction process, by changing the SBR operation method, can realize phosphorus and organic synchronous removal by oxidation step, be suitable for to the sewage of P contained compound particularly the city domestic sewage of low phosphorus compound handle, also can reduce the construction and the working cost of sewage disposal.

Technical scheme of the present invention is, the operation method of described sequencing batch reactor (being the sbr reactor device) non-anaerobic segment biological dephosphorization adopts the common sequencing batch reactor (7) that inlet valve (2), flowing water Valve (3), spoil disposal valve (5) are housed, this reactor bottom is equipped with the aeration head (8) that connects through the same air compressor of under meter (9) (11), it is characterized in that, carry out as follows:

A. open inlet valve (2), sewage enters the sbr reactor device (7) from water inlet pipe (1), after sewage to be advanced finishes, closes inlet valve (2);

B. open air compressor (11) and make the direct aerobic aeration of described reactor, regulate under meter (9), the interior dissolved oxygen concentration of sbr reactor device (7) (DO) was 5.8mgL when aeration was begun ^-1-6.2mgL ^-1, use NaHCO ₃Regulate the pH value with 0.5M HCL, make that the pH value is controlled at 7.0-8.5 in the reaction process, the aerobic aeration time is 3.5h-4.5h;

C. after aerobic aeration finishes, close air compressor (11), precipitate 0.4h-0.6h then, to realize mud-water separation;

D. after precipitation finishes, open water discharging valve (3), making the interior hydraulic detention time of reactor is 11h-13h; Close water discharging valve (3) after draining finishes, open spoil disposal valve (5) and carry out spoil disposal, so that stablize sludge concentration, control mud age, making the interior activated sludge concentration of reactor is 3800mgL ^-1-4200mgL ^-1, mud mud age is 6d-8d;

5, after spoil disposal finished, reactor left standstill 6h-8h.

Below the present invention made further specify.

Among the present invention, above-mentioned operation method is not set up after water inlet for anaerobism section or the anaerobic zone that poly-phosphorus discharges and ergastic substances PHA accumulates, and directly enters the aerobic aeration stage.Therefore, operation method of the present invention obviously runs counter to anaerobic phosphorus release/aerobic traditional biological dephosphorization theory of taking the photograph phosphorus.The applicant finds in early-stage Study, and some microorganisms particularly heterotrophic microorganism the excess picked-up behavior to matrix such as organic carbon source, phosphorus can occur after having experienced abundant with the poor environmental change of matrix repeatedly.SBR absorbs on the basis in the microorganism excess that the operation method of realizing biological phosphate-eliminating under the processing condition of non-anaerobic segment just is being based on the phosphorus of applicant's early-stage Study discovery among the present invention.Owing to exist the long period to leave standstill the phase (6h-8h) between two aerobic sections, produced the stage of a nutrition poorness, be that microorganism is in " hunger " state, when the external world has nutraceutical matrix such as C, P (aerobic section), microorganism can excessively absorb these nutrition fast, temporarily they are absorbed, put aside in cell, in ensuing extraneous shortage nutraceutical matrix, slowly utilize again, get rid of rich phosphorus sludge by each cycle and reach the dephosphorization purpose.

Compare with traditional biological phosphate-eliminating technology, above-mentioned biological phosphate-eliminating operation method has the advantage of following aspect:

(1) phosphor-removing effect is good, and particularly to the city domestic sewage of low phosphorus compound, the clearance of phosphorus can reach more than 90%;

(2) operational path is simplified greatly, and corresponding process control link also obtains simplifying, and this can reduce facility investment, reduces capital construction and running cost;

(3) do not need to be provided with complicated anaerobism section aerobic section alternately, the process that effectively shortened is handled the cycle, thereby can reduce equipment volume, and then reduces floor space;

(4) treatment process can be provided with flexibly, and adaptability is strong.

Description of drawings

Fig. 1 is a kind of example structure synoptic diagram of the sequencing batch reactor (sbr reactor device) that adopts of the present invention.In the drawings:

The 1-water inlet pipe, the 2-inlet valve, the 3-flowing water Valve,

The 4-rising pipe, 5-spoil disposal valve, the 6-shore pipe,

The 7-sequencing batch reactor, the 8-aeration head, the 9-under meter,

The 10-blast main, the 11-air compressor.

Embodiment

Be treated to example illustrated with simcity sanitary sewage and real cell waste water below.

Embodiment 1: the operation method of sequencing batch reactor non-anaerobic segment biological dephosphorization, referring to Fig. 1, the common sequencing batch reactor 7 of inlet valve 2, flowing water Valve 3, spoil disposal valve 5 is equipped with in employing, this reactor bottom is equipped with the aeration head 8 that connects with air compressor 11 through under meter 9, it is characterized in that, carry out as follows:

A. open inlet valve 2, sewage enters the sbr reactor device 7 from water inlet pipe 1, after sewage to be advanced finishes, closes inlet valve 2;

B. open air compressor 11 and make the direct aerobic aeration of described reactor, regulate under meter 9, sbr reactor device 7 interior dissolved oxygen concentrations (DO) were 6mgL when aeration was begun ^-1, use NaHCO ₃Regulate the pH value with 0.5M HCL, make that the pH value is controlled at 7.5 in the reaction process, the aerobic aeration time is 4h;

C. after aerobic aeration finishes, close air compressor 11, precipitate 0.5h then, to realize mud-water separation;

D. after precipitation finishes, open water discharging valve 3, making the interior hydraulic detention time of reactor is 12h; Close water discharging valve 3 after draining finishes, open spoil disposal valve 5 and carry out spoil disposal, so that stablize sludge concentration, control mud age, making the interior activated sludge concentration of reactor is 4000mgL ^-1, mud mud age is 7d;

E. after spoil disposal finished, reactor left standstill 6h-8h.

By above-mentioned operation method treatment of simulated city domestic sewage.Carbon source mainly adopts glucose, and with soluble phosphate in the potassium primary phosphate Simulated Water, water inlet COD is 300-350mgL ^-1, TP is 15-20mgL ^-1The result is as follows after the steady running: water outlet COD is 20 ~ 48mgL ^-1, TP is 0-0.96mgL ^-1, COD, TP clearance reach 89.7 ± 6.5%, 95.6 ± 4.4% respectively.

Embodiment 2: press embodiment 1 described operation method and handle real cell waste water.Water inlet COD is 170-286mgL ^-1, TP is 3.75-8.26mgL ^-1The result is as follows after the steady running: water outlet COD is 26-84mgL ^-1, TP is 0-0.62mgL ^-1, COD, TP clearance reach 77.5 ± 7.8%, 92.2 ± 5.6% respectively.

Claims (1)

1, a kind of operation method of sbr reactor device non-anaerobic segment biological dephosphorization, the common sbr reactor device (7) of inlet valve (2), flowing water Valve (3), spoil disposal valve (5) is equipped with in employing, this reactor bottom is equipped with the aeration head 8 that connects with air compressor 11 through under meter 9, it is characterized in that, carry out as follows:

A. open inlet valve (2), sewage enters the sbr reactor device (7) from water inlet pipe (1), after sewage to be advanced finishes, closes inlet valve (2);

B. open air compressor (11) and make the direct aerobic aeration of described reactor, regulate under meter (9), the interior dissolved oxygen concentration of sbr reactor device (7) (DO) was 5.8mgL when aeration was begun ^-1-6.2mgL ^-1, use NaHCO ₃Regulate the pH value with 0.5M HCL, make that the pH value is controlled at 7.0-8.5 in the reaction process, the aerobic aeration time is 3.5h-4.5h;

C. after aerobic aeration finishes, close air compressor (11), precipitate 0.4h-0.6h then, to realize mud-water separation;

D. after precipitation finishes, open water discharging valve (3), making the interior hydraulic detention time of reactor is 11h-13h; Close water discharging valve (3) after draining finishes, open spoil disposal valve (5) and carry out spoil disposal, so that stablize sludge concentration, control mud age, making the interior activated sludge concentration of reactor is 3800mgL ^-1-4200mgL ^-1, mud mud age is 6d-8d;

E. after spoil disposal finished, reactor left standstill 6h-8h.