RESEARCH PROGRESS ON ANAEROBIC CO-FERMENTATION OF WASTE-ACTIVATED SLUDGE TO PRODUCE ACID UNDER THE GOAL OF LOW CARBON
Under the goal of low carbon,the resource utilization of waste-activated sludge is an important approach to synergistically realize the pollution reduction and carbon reduction of organic solid waste in sewage treatment plants.Anaerobic co-fermentation technology is one of the most effective strategies to realize waste-activated sludge resource utilization.High-value products such as volatile fatty acids obtained by anaerobic co-fermentation of waste-activated sludge and other organic solid wastes can be widely used in the production of industrial products,which can simultaneously reduce carbon emissions and realize resource utilization.However,the existing studies mainly focus on the discussion of acid production efficiency during co-fermentation,and lack a systematic summary and analysis of the mechanism and optimal regulation methods.Therefore,based on previous studies,this paper systematically analyzed acid production efficiency from anaerobic co-fermentation of waste-activated sludge with food waste and agricultural waste,discussed the influence of technological parameters such as C/N ratio,pH,temperature,and sludge residence time,and proposed the downstream application of volatile fatty acids.Meanwhile,the work also prospected the perspective of anaerobic co-fermentation technology of waste-activated sludge from the aspects of energy and economy.This work would provide the theoretical basis and technical guidance for the low carbonization application of waste-activated sludge anaerobic co-fermentation technology.
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