Domestic sewage non-backflow denitrification treatment device and method

Abstract

The invention relates to a domestic sewage non-backflow denitrification treatment device and method. An internal space of an integrated reaction pond body of the device is sequentially divided into anaerobic denitrification areas and aerobiotic nitrification areas, which are alternately distributed and serially connected with one another, along the running direction of the sewage, and an anaerobic denitrification area is arranged on the rearmost end of the reaction pond body; filler which is 80 to 90 percent of the volume of each anaerobic denitrification area is filled inside each anaerobic denitrification area, the upper part of each anaerobic denitrification area is provided with a gas collection pipe which is used for adjusting a self backflow state; and the bottom of each aerobic nitrification area is provided with a micro-pore aeration head, and a corresponding deflection plate is arranged above the rear side of the micro-pore aeration head. The nitrification areas and the denitrification areas are mutually independent from one another, the nitrified bacteria is intercepted in each nitrification area through a self-backflow way of the sludge, the denitrification efficiency is high and no alkaline is needed; and the domestic sewage non-backflow denitrification treatment device and method are suitable for the dispersion domestic sewage treatment, simple in process, convenient to manage, less in investment of capital construction, low in daily running expense and high-efficient in denitrification; and the sewage after being treated can reach a discharging standard A.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a non-reflux denitrification treatment device and method for domestic sewage. Background technique [0002] At present, solving the technical problems of decentralized sewage treatment in the vast rural areas of our country is an important way to improve the ecological environment. From a technical point of view, the research on the traditional wastewater denitrification process has been relatively mature and can operate stably. However, the denitrification process of small and medium-sized sewage treatment is still an important factor that plagues the efficient operation of sewage treatment facilities in my country at this stage. The main reasons are: l) Most of the current denitrification processes are A 2 / O process, the denitrification efficiency is directly proportional to the reflux ratio (Wang Sheping, 2006), and the wastewater treatment fee rises sharply after the denitr...

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Problems solved by technology

But still there are some deficiencies in the denitrification process of segmented water inflow for decentralized sewage treatment facilities: 1) although the existing segmented water inflow process has saved the nitrification liquid backflow facility, the sludge backflow equipment has not been saved; 2) anoxic, good Oxygen zones exist alternately, and the mixed solution flowing from the aerobic zone to the anoxic zone inevitably carries part of the dissolved oxygen. If the control is unfavorable, it may cause other heterotrophic bacteria to compete with denitrifying bacteria for easily degradable COD in the incoming water. For domestic sewage with a C / N ratio, the problem of insufficient carbon source for denitrification will be more serious

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