Treatment system and method for realizing zero emission of landfill leachate and fermented biogas slurry

Abstract

According to the treatment system and method for realizing zero emission of the landfill leachate and the fermented biogas slurry. The landfill leachate and the fermented biogas slurry are subjected to thermal extraction twice, most ammonia nitrogen in the wastewater is removed, and ammonia water is obtained after condensation; residual ammonia nitrogen and volatilizable small molecular COD in thewastewater are removed by adopting a mechanical vapor recompression technology (MVR for short) and a forced circulation flash evaporation technology, and the wastewater is fed into a biochemical reactor for biochemical treatment to obtain regenerated return water; and innocent treatment is performed on the residual high-concentration waste liquid. Therefore, zero emission of landfill leachate andfermented biogas slurry is realized. By adopting the system and the method disclosed by the invention, the wastewater can be completely recycled, the zero-emission treatment of high-ammonia-nitrogenand high-COD landfill leachate and fermented biogas slurry is realized, the biodegradability of the wastewater is improved, the produced ammonia water can bring certain economic benefits, the operation and investment cost of the system is reduced, the heat energy in the system is repeatedly recycled, and the system has the characteristics of low energy consumption, and high efficiency.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment and resource utilization, in particular to a treatment system and method for realizing zero discharge of landfill leachate and fermented biogas slurry. Background technique [0002] Landfill leachate and fermented biogas slurry is a kind of high-concentration organic wastewater, which has high salt content, high chloride ion height, high COD concentration, high ammonia nitrogen content, complex composition, serious imbalance of microbial nutrient elements, difficult to degrade, and poor biodegradability , which is difficult to treat wastewater. In view of the characteristics of high COD, ammonia nitrogen and salt content in landfill leachate and fermented biogas slurry, the current domestic treatment methods for this type of wastewater mainly include: coagulation sedimentation, membrane desalination, stripping deamination, evaporation crystallization, biochemical treatment Wait. [...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a treatment system and method for realizing zero discharge of landfill leachate and fermented biogas liquor, so as to solve the problems existing in the prior art, such as complex and lengthy process, easy clogging of membrane, high energy consumption, poor biodegradability, waste water Valuable resources have not been fully utilized and other issues, starting from how to improve the biodegradability of landfill leachate and fermented biogas liquor to effectively remove ammonia nitrogen and COD in wastewater, seek low energy consumption for treatment, and realize the recycling and utilization of wastewater. Zero-emission process method

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