Enhanced sewage biological nitrogen and phosphorus removal method bases on polyhydroxyalkanoate metabolism regulation

A polyhydroxyalkanoate, metabolic regulation technology, applied in biological sludge treatment, chemical instruments and methods, biological water/sewage treatment, etc. To deal with other problems, to achieve the effect of improving efficiency, easy to promote large-scale, and improving efficiency

Active Publication Date: 2013-10-02
TONGJI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, on the one hand, this method will cause greenhouse gas emissions and a large amount of primary and secondary sedimentation sludge is difficult to deal with; on the other hand, urban sewage generally has the problem of low carbon source concentration, and the low carbon-nitrogen ratio of sewage is difficult. Meet the increasing requirements of phosphorus and nitrogen removal

Method used

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  • Enhanced sewage biological nitrogen and phosphorus removal method bases on polyhydroxyalkanoate metabolism regulation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) if figure 1 As shown, the organic waste obtained by the sewage through the grid 1, the regulating tank 2 and the primary sedimentation tank 3 and the remaining sludge of the secondary sedimentation tank 5 are introduced into the sludge thickening tank 6 for concentration and sedimentation for 24 hours at a VSS ratio of 1:1;

[0037] (2) The concentrated mixture enters the PHA precursor production reactor 9 (anaerobic fermentation for 8 days under the condition of controlling pH=10.0) and is directional converted into PHA precursor;

[0038] (3) The obtained PHA precursor (concentration is 4650mg COD / L, the contents of acetic acid and propionic acid are 48% and 41% respectively) enters the sludge dehydrator 12 after removing nitrogen and phosphorus in the sludge conditioning tank 10, and the obtained liquid pumps Enter the PHA precursor storage pool 11 for storage;

[0039] (4) Pump the liquid in the supernatant storage tank 7 and the PHA precursor into the PHA prod...

Embodiment 2

[0042] (1) if figure 1 As shown, the organic waste obtained by the sewage through the grid 1, the regulating tank 2 and the primary sedimentation tank 3 and the remaining sludge of the secondary sedimentation tank 5 are introduced into the sludge concentration tank 6 for concentration and precipitation for 12 hours at a VSS ratio of 10:1;

[0043] (2) The concentrated mixture enters the PHA precursor production reactor 9 (anaerobic fermentation under the condition of controlling pH=8.0 for 8 days);

[0044](3) The obtained PHA precursor (concentration is 4230mg COD / L, the contents of acetic acid and propionic acid are 56% and 28% respectively) enters the sludge dehydrator 12 after removing nitrogen and phosphorus in the sludge conditioning tank 10, and the obtained liquid pumps Enter the PHA precursor storage pool 11 for storage;

[0045] (4) Pump the liquid in the supernatant storage tank 7 and the PHA precursor into the PHA production reactor 8 (control pH=6.8, react for 3....

Embodiment 3

[0047] (1) if figure 1 As shown, the organic waste obtained by the sewage through the grid 1, the regulating tank 2 and the primary sedimentation tank 3 and the remaining sludge of the secondary sedimentation tank 5 are introduced into the sludge concentration tank 6 for concentration and precipitation for 24 hours at a VSS ratio of 5:1;

[0048] (2) The concentrated mixture enters the PHA precursor production reactor 9 (anaerobic fermentation under the condition of controlling pH=8 for 8 days);

[0049] (3) The obtained PHA precursor (concentration is 4310mg COD / L, the contents of acetic acid and propionic acid are 50% and 31% respectively) enters the sludge dehydrator 12 after removing nitrogen and phosphorus in the sludge conditioning tank 10, and the obtained liquid pumps Enter the PHA precursor storage pool 11 for storage;

[0050] (4) Pump the liquid in the supernatant storage tank 7 and the PHA precursor into the PHA production reactor 8 (control pH=7.2, react for 3.5 ...

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Abstract

The invention belongs to the field of environmental protection technology and relates to an enhanced sewage biological nitrogen and phosphorus removal method bases on polyhydroxyalkanoate metabolism regulation. The method comprises the following steps: introducing grain organic matters obtained after primary sedimentation and residual sludge discharged from a secondary sedimentation tank into a sludge tihckener for condensation; conducting anaerobic fermentation on the condensed organic refuses in a production reactor of a polyhydroxyalkanoate precursor to synthesize polyhydroxyalkanoate precursor; removing nitrogen and phosphor, and pumping the liquid into a pool for the polyhydroxyalkanoate precursor; pumping the polyhydroxyalkanoate precursor into a production reactor of polyhydroxyalkanoate to generate polyhydroxyalkanoate; and pumping the sewage into a routine sewage biological nitrogen and phosphorus removal reactor to carry out a sewage biological nitrogen and phosphorus removal process. The method provided by the invention can increase the removal rate of nitrogen and phosphor to 80% and 95%, and the treated outlet water reaches the sewage discharge standard Grade A. The method has advantages of convenient technology control, a small amount of generated greenhouse gas and sludge, and low cost of a reconstruction technology.

Description

technical field [0001] The invention belongs to the technical field of biological treatment of water, waste water or sewage, and relates to a method for enhancing phosphorus and nitrogen removal of urban sewage by regulating the metabolism of polyhydroxyalkanoate (PHA) by an in-situ carbon source. Background technique [0002] With the development of the economy and the improvement of living standards, the discharge of industrial and domestic sewage has increased year by year, and the problem of water pollution has become increasingly serious. A large amount of nutrients such as nitrogen and phosphorus flow into natural water bodies such as rivers and lakes, resulting in widespread eutrophication. The discharge of nitrogen and phosphorus in sewage is the main cause of water eutrophication. Activated sludge method has become a main method for removing nitrogen and phosphorus in sewage because of its advantages such as easy operation. However, on the one hand, this method wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
CPCC02F3/308C02F11/02C02F11/04C12P7/625Y02W10/20
Inventor 陈银广郑雄任洪强苏应龙唐诗璟
Owner TONGJI UNIV
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