Combined device for producing carbon source by medium-temperature alkaline hydrolysis of sludge

Abstract

The invention provides a combined device for producing a carbon source by medium-temperature alkaline hydrolysis of sludge. The combined device comprises a sludge pretreatment device and a hydrolysis acidification tank. After entering the combined device, the sludge is firstly concentrated by the sludge pretreatment device, so that the water content of the sludge is reduced, thereby facilitating the fermentation of the sludge. The concentrated sludge enters the hydrolysis acidification tank to be subjected to medium-temperature alkaline hydrolysis fermentation; organic matters which cannot be directly utilized originally are decomposed into the utilizable micromolecular carbon source to be enriched in a supernatant of the hydrolysis acidification tank; the carbon source can be discharged along with the supernatant, and is reused in the front end of a sewage treatment biochemical pool so as to replace or reduce the addition of an external carbon source. The undecomposed sludge after fermentation is gathered at the bottom of the hydrolysis acidification tank, and can be removed regularly. According to a material balance principle, the organic matters which cannot be directly utilized originally in the sludge can be converted into directly utilizable organic matters, thereby realizing sludge reduction.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a combined device for producing carbon sources from medium-temperature alkaline hydrolysis sludge. Background technique [0002] At present, most sewage treatment plants have the problem of insufficient carbon source in the influent. The lack of carbon source also intensifies the competition of denitrifying bacteria and phosphorus accumulating bacteria for carbon source, resulting in poor biological phosphorus and nitrogen removal and poor effluent quality. Up to standard. At the same time, for sewage treatment plants using biological methods, there are still problems of large sludge output and high disposal costs. [0003] Domestically, the problem of insufficient carbon sources is usually solved by adding carbon sources, while sludge treatment is generally solved by landfill or incineration after compression and dehydration. In terms of supplementary carbon sources, ...

AI Technical Summary

Problems solved by technology

However, domestic engineering cases are rarely seen. In addition to domestic awareness of such issues and policy guidance, the objective feasibility also plays a certain role in limiting the development of this technology.

At present, this technology is mainly still in the laboratory stage, and there is no mature equipment that can be used directly, so engineering application cannot be realized

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