Micro-electric field stimulation coupled anaerobic membrane distillation reactor and method for enhancing methanogenesis thereof

By introducing micro-electric field stimulation into the anaerobic membrane distillation reactor, the problem of inhibited methanogenic bacteria activity in the treatment of high-salt and high-ammonia-nitrogen wastewater was solved, achieving efficient methane generation and stable operation, and improving the system's resistance to shock loads and metabolic recovery capabilities.

CN122444323APending Publication Date: 2026-07-24GUANGZHOU UNIVERSITY
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Patent Information

Application Number
CN202610913858.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-06-24
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

Existing anaerobic membrane distillation bioreactors suffer from problems such as inhibited methanogenic bacteria activity, accumulation of volatile fatty acids, and low energy recovery efficiency when treating complex saline organic wastewater containing high salt, high ammonia nitrogen, and recalcitrant organic matter. As a result, they are unable to maintain high methane generation performance under long-term stable operation and high-salt conditions.

Method used

A micro-electric field-coupled anaerobic membrane distillation reactor is adopted. By setting up a composite anode and a carbon brush cathode in the anaerobic reaction vessel, a micro-electric field of 0.3~0.8V is applied. Combined with membrane distillation components, a temperature control unit, and a stirring unit, interspecies electron transfer is enhanced, thereby improving the activity of methanogenic bacteria and the methane recovery capacity.

Benefits of technology

It significantly improves gas production efficiency and methane recovery capacity, enhances the system's tolerance to high salt and high ammonia nitrogen shocks, ensures the stability of long-term continuous operation and rapid recovery of metabolic function, and increases methane yield by about 40% under complex operating conditions.

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Abstract

This invention discloses a micro-electric field-stimulated coupled anaerobic membrane distillation reactor and its method for enhancing methanogenesis, belonging to the field of wastewater treatment and resource utilization technology. The reactor includes an anaerobic reaction tank, a micro-electric field stimulation unit, a membrane distillation assembly, a temperature control unit, an influent unit, a condensation and collection unit, a vacuum pump, and a biogas collection unit. The micro-electric field stimulation unit consists of a composite anode, a carbon brush cathode, and an external DC power supply, applying a micro-electric field of 0.3~0.8V. The method includes inoculating anaerobic sludge, adding kitchen wastewater and / or landfill leachate, starting membrane distillation at 45~65℃ and applying a micro-electric field, gradually increasing the proportion of landfill leachate, collecting biogas, and monitoring methane content. This invention utilizes a low-voltage micro-electric field to promote interspecies electron transfer, achieving a methane yield exceeding 340mL / gCOD at a 1:1 ratio of kitchen wastewater to landfill leachate, approximately 40% higher than the control, and enhancing the system's resistance to shock loads and metabolic recovery capacity.
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