New process for treating sewerage

Abstract

A process for treating sewage includes such steps as mixing the sewage with active sludge in a reactor A, cleaning in a reactor B, draining the cleaned sewage, delivering the separated sludge to a reactor C, returning part of it to the reactor A, and discharging the rest. Its advantages are use of small reactors instead of one large aerating pool, and low cost.

Description

【Technical field】 [0001] The invention belongs to the field of environmental protection and relates to a sewage treatment process. 【Background technique】 [0002] Since the 1980s, the research, development and application of new sewage biological treatment processes and technologies have made considerable progress worldwide, and many new sewage biological treatment techniques have emerged, including activated sludge process, contact oxidation, etc. Method, AB method, SBR method (including CAST, MSBR process, etc.), oxidation ditch method, facultative oxygen hydrolysis process and the combination of the above processes, etc., some of which have been widely used in engineering practice in various parts of our country. The existing biological treatment of sewage is mainly realized through the two processes of microbial absorption (adsorption) and degradation of pollutants: the first process, the microorganisms absorb (adsorption) the pollutants in the water body to separate the...

AI Technical Summary

Problems solved by technology

From a macro point of view, the transfer of pollutants from sewage to microorganisms and the metabolic degradation of pollutants in vivo by microorganisms are not separated in time and space, that is, the separation of pollutants from water and the separation of pollutants in microorganisms. The degradation in the body is carried out simultaneously in the same aeration tank and other reactors. The rate of pollutants being metabolized and degraded by microorganisms is much lower than the rate of microbial absorption (adsorption), so that the aeration tank and other reactors must have a larger volume. As a result, the project investment and floor area are relatively large. In this case, aeration of sewage will result in large ineffective power consumption; and the concentration of sludge is low, and the probability of air (dissolved oxygen) contacting and colliding with microorganisms is small. The utilization rate is low, therefore, the total energy consumption is high

In addition, activated sludge is a simple microbial floc, which is prone to problems such as sludge bulking.

[0003] The disadvantages of similar processes are: 1. Only focusing on degrading pollutants directly in sewage, the degradation efficiency is low

2. The separation and degradation of pollutants are carried out in the same time and space, the sewage treatment takes a long time, and the required reactor is bulky and costly

3. When the aeration device supplies oxygen, the ineffective power consumption is large, and the oxygen absorption rate is low

These defects make the existing similar sewage treatment processes (including combined processes) poor in processing capacity, low in efficiency, high in energy consumption, and have certain difficulties in operation control. The project scale of unit sewage treatment is large, and the best investment in sewage treatment The scale of the control point and the operation cost are large, so that the investment and operation cost of the sewage treatment project are high, and the sewage treatment plant occupies a large area

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