Sewage treatment equipment and sewage treatment method

Abstract

The invention relates to sewage treatment equipment, which comprises a pre-aeration device, an anoxic device, an anaerobic device and an intermittent aeration device; a stirring device is arranged in the anoxic device, the anaerobic device and the intermittent aeration device; an aeration head is arranged in the pre-aeration device and the intermittent aeration device; a mixed solution back-flow device is arranged between the intermittent aeration device and the anoxic device; and sewage treated through the intermittent aeration device flows back to the anoxic device through the mixed solution back-flow device. The advantages of the activated sludge method and the intermittent aeration method are combined in the sewage treatment equipment disclosed by the invention; sewage high-efficiency denitrification having low C/N ratio is realized; furthermore, the impact load resistant performance of the system is good; the amount of residual sludge is low; the process is flexible; and the operation cost is low.

Description

technical field [0001] The invention relates to a sewage treatment equipment and a sewage treatment method, in particular to a low C / N ratio sewage treatment equipment and a sewage treatment method. Background technique [0002] In recent years, as the contradiction between supply and demand of water resources has become increasingly prominent, the shortage of water resources has become one of the key issues restricting the development of the national economy and the improvement of people's lives. , also requires water conservation and rational use of non-traditional water resources. The large discharge of production wastewater and domestic sewage has led to the increase of nitrogen in the water body. Although the sewage treatment rate in my country has continued to increase, and the current sewage discharge standard has been raised from the second level to the first level, the eutrophication of the water body is caused by the presence of nitrogen and phosphorus in the water...

AI Technical Summary

Problems solved by technology

The large discharge of production wastewater and domestic sewage has led to the increase of nitrogen in the water body. Although the sewage treatment rate in my country has continued to increase, and the current sewage discharge standard has been raised from the second level to the first level, the eutrophication of the water body is caused by the presence of nitrogen and phosphorus in the water body. However, the chemical and related problems have not been completely solved, and the recovery of phosphorus through physical and chemical methods has achieved good results, so the biological method of water treatment is mainly to remove nitrogen

Nitrogen compounds can only be effectively removed by biological methods. Sufficient carbon sources are the key to denitrification of sewage. In theory, biological denitrification can achieve good denitrification effects under the condition that the influent C / N ratio is not lower than 3.4. However, the domestic sewage, chemical wastewater, aquaculture wastewater, and landfill leachate in most cities in my country have a C / N ratio lower than 3.4 due to rainwater inflow and other reasons. Usually, external carbon sources must be added to achieve a better treatment effect. However, such a treatment method increases the cost of water treatment, and at the same time increases the amount of sludge discharge, greenhouse gas emissions, etc.

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