Anaerobic fermentation device with struvite recycling function and fermentation acid production method thereof

Abstract

The invention discloses an anaerobic fermentation device with a struvite recycling function. The anaerobic fermentation device comprises a tank body, wherein the tank body is internally provided with a sludge internal circulation structure and a struvite recycling structure; the sludge internal circulation structure comprises an internal circulation tube, an internal circulation pump and a sludge inlet tube; the struvite recycling structure comprises a basin-shaped structure, an inverted funnel-shaped structure, a stirring machine, an alkali liquid input device and a magnesium source liquid input device and various discharge tubes. According to a method for utilizing the anaerobic fermentation device with the struvite recycling function to ferment to produce acid, the pH value is stabilized and the nitrogen and the phosphorus in a fermented liquid are recycled by controlling the sludge feeding amount and the circulation amount every day. According to the anaerobic fermentation device with the struvite recycling function and the fermentation acid production method disclosed by the invention, the pH value in the anaerobic fermentation process is stable, the fermentation efficiency is high, the nitrogen and the phosphorus in the fermented liquid can be effectively removed, and then struvite crystal with relatively high purity can be collected, so that the method is an economic and efficient sludge treatment method and has good social and economic benefits.

Description

Technical field [0001] The invention belongs to the technical field of water pollution control, and particularly relates to an anaerobic fermentation device with struvite recovery function and a method for fermentation to produce acid by using the device. Background technique [0002] At present, sludge digestion is mainly divided into anaerobic digestion and aerobic digestion. Among them, the aerobic digestion of sludge is similar to the activated sludge method, which is carried out in an aeration tank, and the sludge is aerated for a long time without adding substrates, so that the microorganisms in the sludge are in the endogenous respiration Self-oxidation is carried out in the stage, so the biodegradable part of the microbial organism can be oxidized and removed, the digestion degree is high, and the amount of remaining digested sludge is small. However, the operation of aerobic sludge consumes a lot of energy, the operating cost is high, and the degree of sludge organic ma...

AI Technical Summary

Problems solved by technology

In the existing process, the acid production by anaerobic fermentation is separated from the removal of nitrogen and phosphorus from the fermentation liquid, which leads to the large area occupied by the process of using the remaining sludge fermentation liquid as a carbon source, so that the acid production process by anaerobic fermentation has not been widely used

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