Method for circulating and reutilizing sludge during process of sewage

Abstract

Treatment of refused pollutant is carried out by EC treating for sludge in sewage treatment plant, removing heavy metal, pesticides and antibiotics residues, entering into sludge dewatering apparatus to dewater, delivering dewatered sludge to air-drying farm to air dry, adding into additives to adjust N, P and K proportion in sludge, entering dried sludge into composting chamber to compost, transferring air to composing chamber, spraying water while timing agitating, adding into EM, fermenting, delivering manure mixture to livestock farm and feeding by earthworm. Earthworm's excrement can be used as biological organic fertilizer. It's cheap and economical.

Description

technical field [0001] The invention belongs to the technical field of waste pollutant treatment, and in particular relates to a sludge recycling method in the sewage treatment process. Background technique [0002] The generation of sludge is inevitable in the process of human activities. The arbitrary stacking and discarding of a large amount of sludge produced by sewage treatment has caused new pollution to the environment. How to properly dispose of this sludge has become a topic of common concern worldwide. [0003] Sludge is the solid sedimentation material produced by water and wastewater treatment processes. Generally refers to municipal drainage sludge. The output of sludge accounts for about 0.3% to 0.5% of the total amount of sewage treatment (calculated with a water content of 97%). In addition to nitrogen, phosphorus and other nutrients needed for crop growth, sludge can improve In addition to the organic matter in the soil structure, it also contains potentia...

AI Technical Summary

Problems solved by technology

However, the infrastructure investment and operating costs required for sludge incineration are relatively high, and incineration will produce certain smoke and dust, resulting in secondary pollution

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