Sewage treatment system

Abstract

The invention discloses a sewage treatment system which comprises a collection tank, a biogas tank, a residue discharge tank and a biogas liquid collection tank; the biogas tank, which is a closed tank, is connected with the collection tank through a feed opening and has an impervious layer laid at the bottom; excreta, sewage or the like is placed in the methane tank and automatically form a biogas residue layer, a biogas liquid layer and a biogas layer after fermenting in the biogas tank, and a residue discharge opening, a liquid outlet and a gas collecting opening, which are communicated with the biogas residue layer, the biogas liquid layer and the biogas layer respectively, are arranged at the periphery of the biogas tank; the residue discharge tank is communicated with the residue discharge opening through a pipeline; the biogas liquid collection tank is communicated with the biogas tank through the liquid outlet; a biogas liquid purification system is connected with the biogas liquid collection tank. According to the sewage treatment system provided by the invention, biogas, biogas liquid and biogas residue, which are produced through centralized processing of sewage, are utilized effectively, so that all-around utilization of sewage can be realized; meanwhile, water and residue can be separated automatically through reasonable pipeline design, the sewage utilization rate is high, the engineering construction cost is low, the economic benefit is high, and large scale popularization can be performed easily.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a sewage treatment system for animal husbandry. Background technique [0002] my country has a huge animal husbandry industry chain, which has made significant contributions to promoting national development and increasing farmers' income. However, in view of the limitation of our country's current level of agricultural science and technology, a large amount of sewage is directly discharged into rivers during production, causing serious pollution. Therefore, drawing on the development experience at home and abroad, our country has begun to vigorously develop green agriculture and build ecological and environmentally friendly breeding. Among them, it includes a sewage treatment system that collects and ferments human and animal excrement or sewage to obtain biogas and install various energy utilization devices around the biogas. At present, this kind of sewage treatment system is...

AI Technical Summary

Problems solved by technology

At present, this kind of sewage treatment system is still limited to small-scale and small-scale applications. Most biogas digesters only recycle sewage one-sidedly. After obtaining biogas, the remaining biogas slurry and biogas residue are discarded as waste.

In addition, biogas residue and biogas slurry are often deposited at the bottom of the biogas digester. The mixture of biogas slurry and biogas residue is difficult to separate. It needs to be manually salvaged and cleaned regularly before being separated for further use.

The utilization rate of sewage is still very low, the construction cost is high, the economic benefit is low, and it is difficult to promote on a large scale

At the same time, the treated sewage is often difficult to meet the discharge standards, causing serious pollution

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