A sludge fermentation method for municipal wastewater treatment

By combining the synergistic effects of a compound agent for pest control, consisting of hyperbranched polyester bactericide, penicillin, insecticide, and heavy metal remover, with a fermentation compound agent, the problem of incomplete treatment of harmful substances in existing sludge fermentation methods is solved. This achieves efficient sludge fermentation and reduction of harmful substances, producing fertilizer suitable for fertilization and soil improvement.

CN117843206BActive Publication Date: 2025-12-02BEIJING SIQINGYUAN BIO TECH
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Patent Information

Application Number
CN202410164363.2
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-02-05
Publication Date
2025-12-02
Estimated Expiration
2044-02-05

AI Technical Summary

Technical Problem

In existing sludge fermentation methods, pesticides inhibit the biological activity of bacteria and enzymes, resulting in incomplete treatment of pathogens, parasite eggs, and heavy metals. There is still room for further reduction in the content of harmful substances in fermented sludge.

Method used

A fungicide composed of hyperbranched polyester and penicillin is used, combined with insecticides and heavy metal removers, and fungi such as Trichoderma reesei, Candida albicans, and Aspergillus. Cellulase and pectinase are used for synergistic fermentation to form a pest control compound, which ensures that the content of harmful substances is reduced without affecting the biological activity during the fermentation process.

Benefits of technology

It significantly reduces the content of harmful substances in fermented sludge, achieving efficient fermentation of sludge and complete removal of harmful substances, producing fertilizer suitable for fertilization and soil improvement.

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Abstract

This application relates to the technical field of wastewater treatment, specifically disclosing a sludge fermentation method for municipal wastewater treatment, comprising the following steps: mixing sludge, fermentation compound agent, pest control compound agent, and water evenly and stirring for 15-18 hours, followed by filtration to obtain fermented sludge; the pest control compound agent includes bactericides, insecticides, and heavy metal removal agents, wherein the bactericides include a hyperbranched polyester bactericide and penicillin in a weight ratio of (2.5-3):(1.2-1.5), and the fermentation compound agent includes *Trichoderma reesei*, *Candida*, *Aspergillus*, cellulase, and pectinase. The method of this application can be used to treat municipal wastewater, and has the advantages of reducing the harmful content of fermented sludge, realizing sludge recycling and reuse, and having a simple procedure.
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