Method for treating sewage with low carbon nitrogen ratio

Abstract

The invention belongs to the technical field of sewage treatment and discloses a method for treating sewage with a low carbon nitrogen ratio. The method comprises the following steps of (1) preparation of a solid carbon source filler bio-membrane reactor, specifically, the bio-membrane reactor is filled with a solid carbon source material, inoculated active sludge and sewage are poured into the bio-membrane reactor, the bio-membrane reactor is emptied after a period of time of standing, sewage is injected from the bottom of the bio-membrane reactor in an aerated state till biofilm formation succeeds; and (2) synchronous nitrification and denitrification of the sewage, specifically, the sewage is injected continuously from the bottom of the solid carbon source filler bio-membrane reactor inthe aerated state, the sewage is subjected to synchronous nitrification and denitrification when flowing through the solid carbon source material, and then water is discharged from the upper part ofthe solid carbon source filler bio-membrane reactor. The method effectively reduces the concentration of organic matter, reduces the aeration amount required for the aerobic reaction, and improves thesewage treatment efficiency. According to the method, the cost is low, the energy consumption of projects is reduced, the occupied space is small, and the characteristics of being flexible, economical, environmentally friendly and the like are achieved.

Description

Technical field [0001] The invention belongs to the technical field of sewage treatment, and particularly relates to a method for treating sewage with a low carbon to nitrogen ratio. Background technique [0002] In recent years, due to the rapid development of the country, the living standards of residents have been significantly improved, and the large-scale use of various nitrogen and phosphorus substances has caused the characteristics of low-carbon sources of urban domestic sewage in my country, especially in the south. The influent chemical oxygen demand (COD Cr ) The concentration is only 100-200mg / L, but the nitrogen and phosphorus content is relatively high, resulting in a low C / N ratio of the water body, which cannot meet the requirements of biological denitrification. The carbon source acts as an electron donor in the process of biological denitrification and is one of the core substances of biological denitrification. It plays a major role in the biological denitrific...

AI Technical Summary

Problems solved by technology

For urban sewage with low C / N ratio, when the carbon source in the sewage is not enough to meet the denitrification effect, it is usually necessary to supplement the external carbon source during the treatment process to solve the actual sewage denitrification problem. The commonly used external carbon source is liquid organic matter. The main liquid carbon source, although the liquid carbon source has a fast carbon supply speed and a significant reaction effect, but in the process of sewage treatment, the dosage of liquid organic carbon is not easy to control, the cost is high, and the toxicity of methanol is easy to cause secondary pollution

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