Sewage carbon source recovery system and method

Abstract

The invention relates to a sewage carbon source recovery system and method. The sewage carbon source recovery system comprises a sewage introduction device, an aeration sand setting device, a pumping device, a fermentation device and a stirring device. Sewage enters the aerated sand setting device, and large-particle to-be-decomposed carbon source grit is deposited at the bottom of the aerated sand setting device under the action of gravity; then the to-be-decomposed carbon source grit is pumped into the fermentation device through the pumping device, the to-be-decomposed grit carbon source is primarily decomposed through the fermentation device to obtain primarily decomposed carbon source grit, and then the primarily decomposed carbon source grit continues to flow back into the stirring device to be stirred and decomposed to obtain re-decomposed carbon source grit; and finally, the decomposed carbon source grit flows back to the aerated grit setting device, so that a carbon source and sewage mixed solution is obtained in the aerated grit setting device, the carbon source and sewage mixed solution contains a carbon source released after decomposition, the carbon source can be used as substances required by subsequent nitrogen and phosphorus removal operation, and the carbon source input cost during subsequent nitrogen and phosphorus removal is reduced.

Description

Technical field [0001] The present disclosure relates to the field of sewage treatment, and more particularly to a sewage carbon source recovery system and method. Background technique [0002] The sewage contains a large amount of resources or energy, such as dissolved carbon sources such as particulate carbon sources and inorganic gravel surfaces, etc., which can be used as the carbon source required for denitrification and phosphorus reactivity during the sewage treatment, reducing the sewage treatment process. Carbon source investment costs. [0003] However, in the current sewage treatment, the particulate carbon source in the sewage is directly discharged, causing the amount of carbon source in the sewage. A large amount of carbon source in sewage, resulting in subsequent carbon sources required for sewage to remove nitrogen and phosphorus, and excustted, sands that are discharged from organic matter such as carbon sources, may cause secondary pollution. Inventive content ...

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Problems solved by technology

[0003] However, in the current sewage treatment, the particulate carbon source in the sewage is directly discharged together with the sand, resulting in a low carbon source content in the sewage

The loss of a large amount of carbon sources in sewage leads to the lack of carbon sources required for the subsequent denitrification and phosphorus removal of sewage, and the discharged sand contains organic matter such as carbon sources, which may cause secondary pollution

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