Return sludge separation technique for improving dephosphorization removing nitric efficiency factor of wastewater treatment

A technology for returning sludge and denitrification efficiency, which is applied in the field of returning sludge separation technology to achieve the effect of improving removal efficiency

Inactive Publication Date: 2008-09-24
NANJING AGRICULTURAL UNIVERSITY
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Problems solved by technology

[0019] Technical Problem The return sludge separation process (referred to as RSSP process) of the present invention is a method to improve the comprehensive treatment efficiency of nitrogen and phosphorus in urban sewage treatment plants, which

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  • Return sludge separation technique for improving dephosphorization removing nitric efficiency factor of wastewater treatment
  • Return sludge separation technique for improving dephosphorization removing nitric efficiency factor of wastewater treatment
  • Return sludge separation technique for improving dephosphorization removing nitric efficiency factor of wastewater treatment

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Embodiment Construction

[0043] The implementation process of the present invention is described below

[0044] The experiment uses typical domestic sewage, and its main water quality indicators are as follows: pH is 7.3; COD is 250-400mg / L; BOD5 is 160-280mg / L; TN is 30-45mg / L; NH4+-N is 15-20mg / L ; NO3--N is 0.2mg / L; TP is 8-10mg / L; alkalinity is 380-440mg / L.

[0045] The return sludge separation process, abbreviated as RSSP (Return SludgeSeparate Process), was carried out at a scale of 0.5 cubic meters per day, and was compared with A 2 / O process for comparative study.

[0046] A 2 For the / O process, see Li Gendong, Diao Shushen. Discussion on biological phosphorus removal technology for wastewater, "Environmental Technology" 2005, Issue 1, 37-38. The main reaction zone is composed of anaerobic pool, anoxic pool and aerobic pool. The present invention improves the return sludge separation process (RSSP) of sewage treatment dephosphorization and denitrification efficiency, is in A 2 On the bas...

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Abstract

The invention relates to a returned sludge separation process improving the sewage treatment dephosphorization and denitrification efficiency, and belongs to the new sewage treatment technology. The returned sludge separation process has the specific contents that: firstly, sludge at the bottoms of two settlement tanks flows inversely, and the sludge return flow R(R is equal to Qr/Q) is controlled between 50 and 85 percent; secondly, the return flow sludge enters into a cavitation air concentration treatment system for performing the concentration and the separation, and is separated into two parts of supernatant fluid and concentrated sludge. The process needs the concentration percentage f (f is equal to Qr/Qs) of the cavitation air concentration separation process to be controlled between 2.5 and 3.2, and requires the suspended solid concentration in the supernatant fluid not to be more than 550 mg/L; thirdly, the separated supernatant fluid singly flows inversely to an oxygen-poor tank for the denitrification, the concentrated sludge flows directly and inversely to an anaerobic tank. The returned sludge separation process of the invention can effectively improve the removal efficiency of nitrogen and phosphorus in the sewage treatment process with stable operation, and easily utilize the existing wastewater treatment process to be changed and realized; meanwhile, the investment is small, and the operation cost is low.

Description

1. Technical field [0001] The invention relates to a return sludge separation process for improving the phosphorus and nitrogen removal efficiency of sewage treatment, belongs to the new technology field of sewage treatment, and is mainly used for improving the treatment efficiency of nitrogen and phosphorus in urban sewage treatment plants and industrial sewage treatment processes. 2. Background technology [0002] (1) The problem of eutrophication caused by nitrogen and phosphorus discharge is becoming more and more serious [0003] Water eutrophication is one of the top ten environmental problems in the world, and it is also a very prominent environmental problem facing our country at this stage. Especially in recent years, the main large lakes in my country's inland have experienced water eutrophication to varying degrees, and the situation has become increasingly serious. In 2007, the cyanobacteria outbreak in Taihu Lake once again sounded the alarm for us. [0004] Th...

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Application Information

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IPC IPC(8): C02F3/30
Inventor 蔡天明陈立伟殷红兰霍秀兵王艳
Owner NANJING AGRICULTURAL UNIVERSITY
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