System and method for treating sludge with efficient recycling and low pollution emission

Abstract

The invention relates to the field of sludge treatment and in particular relates to a system and a method for treating sludge with efficient recycling and low pollution emission to reduce the ammonia nitrogen concentration of deaminated sludge, reduce the organic matter consumption, increase the biogas yield and reduce the pollutant emission in sludge treatment. The invention adopts the technical scheme as follows: the method comprises the following steps: thermally hydrolyzing the sludge, cooling, performing anaerobic fermentation to generate biogas, cooling the fermented sludge, mixing with a nitrite solution, deaminating in an anaerobic ammonia oxidation tank, circularly returning one part of the deaminated sludge to an anaerobic fermentation tank to reduce the ammonia nitrogen concentration of the anaerobic fermentation tank and prevent the inhibition effect of high-concentration ammonia nitrogen on the biogas, and performing anaerobic fermentation on organic matters in the part of the deaminated sludge to generate more biogas; dehydrating another part of the deaminated sludge to greatly reduce the ammonia nitrogen concentration and the organic matter content of the dehydrated sludge and filter liquor. The system and the method have the advantages of efficient recycling and low pollution emission in sludge treatment, and have high economic and environmental benefits.

Description

technical field [0001] The invention relates to the field of sludge treatment, in particular to a sludge treatment system and method with high-efficiency resource utilization and low pollution discharge. Background technique [0002] (1) Sludge anaerobic fermentation treatment technology [0003] In recent years, the improvement of China's environmental protection requirements has led to the rapid development of the sewage treatment industry, and the sewage treatment capacity, treatment volume, and sludge production have all increased rapidly. The composition and chemical properties of sludge are complex, including organic matter, plant nutrients, etc., as well as toxic and harmful substances such as heavy metals, pathogens, and persistent organic matter. Without effective treatment, sludge can easily cause secondary pollution to groundwater, soil, etc. , so that the environmental benefits of sewage treatment facilities are greatly reduced. Sludge treatment should meet the...

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Problems solved by technology

During the oxidation of ammonia nitrogen to nitrite under aerobic conditions, some organic matter will also be consumed due to the oxidation reaction, resulting in a decrease in the concentration of organic matter

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