Method for treating domestic sewage by modifying agricultural wastes

By modifying corn cobs or corn stalks and mixing them with activated sludge, the problem of poor nitrogen removal and phosphorus removal results caused by low organic carbon concentration in sewage is solved, and efficient sewage treatment and resource utilization of agricultural waste are achieved.

CN119750769APending Publication Date: 2025-04-04CHINA JAPAN FRIENDSHIP ENVIRONMENTAL PROTECTION CENT
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Patent Information

Application Number
CN202411958419.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-27
Publication Date
2025-04-04

AI Technical Summary

Technical Problem

The low organic carbon concentration in the tail water of existing sewage treatment plants leads to poor deep nitrogen removal and phosphorus removal effects, and agricultural waste has not been effectively utilized in resource utilization.

Method used

Modified agricultural waste is formed by modifying corn cobs or corn stalks, such as alkali treatment, oxidation treatment or alkali oxidation treatment, and mixed with activated sludge to treat domestic sewage to achieve nitrogen removal and phosphorus removal effect.

Benefits of technology

Modified corn cobs and corn stalks significantly improve the release rate and biochemical properties of organic carbon, enhance denitrification and nitrogen removal performance, improve the nitrogen removal and phosphorus removal effect of wastewater, and realize the resource utilization of agricultural waste.

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Abstract

The invention belongs to the technical field of domestic sewage treatment, and provides a method for treating domestic sewage by modifying agricultural wastes. The method comprises the following steps: modifying the agricultural wastes to obtain modified agricultural wastes; the agricultural waste is corncob or corn straw; inoculating the modified agricultural wastes with activated sludge to obtain a mixture, and carrying out nitrogen and phosphorus removal treatment on the domestic sewage by the mixture to obtain treated domestic sewage; the temperature of the modification treatment is 32-37 DEG C, and the time is 18-22 hours. After the denitrification reactor adopting the modified corncob as the filler is subjected to biofilm culturing for 20 days, when the HRT is 24 hours and the nitrate inflow concentration is 15 mg / L, the reactor reaches the highest denitrification efficiency and has good denitrification performance; the influence of the phosphate inflow concentration on the denitrification effect of the modified corncob reactor is small; the COD concentration is in a decreasing trend along with time.
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