外源添加剂强化剩余污泥厌氧发酵产酸的影响研究

Effect of Exogenous Additives on Acid Production by Anaerobic Fermentation of Waste Activated Sludge

挥发性脂肪酸(VFA)是污水生物处理中反硝化脱氮和厌氧释磷过程必需的碳源,还能作为底物生产高附加值的产品,而利用剩余污泥进行厌氧发酵是产VFA的重要途径之一。为了提高污泥产酸效率,利用外源添加剂促进和强化污泥厌氧发酵产酸的研究逐渐引起重视。文章总结了抗生素、表面活性剂、植物化学物质和盐类四类外源添加剂对污泥厌氧发酵产酸过程的影响,分别从外源添加剂对污泥的增溶、水解、产酸和产甲烷四个过程进行了分析,同时阐述了外源添加剂在污泥中的降解、残留状况,最后提出对两种或两种以上的外源添加剂联用促进产酸和寻找能促进污泥产酸的共发酵基质也是今后的研究重点。

Volatile fatty acids(VFA)are essential carbon sources for denitrifying nitrogen removal and anaerobic phosphorus release in biological wastewater treatment and can also be used as substrates to produce high value-added products.Anaerobic fermentation using waste activated sludge(WAS)is one of the important ways to produce VFA.In order to improve the efficiency of sludge acid production,the research of using exogenous additives to promote and strengthen the anaerobic fermentation of waste activated sludge has been paid more and more attention.This paper summarizes the influence of four kinds of exogenous additives(the antibiotics,surfactants,plant chemicals and salt)on the anaerobic fermentation process of WAS,analyze the four processes of solubilization,hydrolysis,acidification and methane-producing,and expounds the degradation and residue of exogenous additives in WAS.Finally,it is suggested that the combination of two or more exogenous additives to promote acid production and the search of co-fermentation substrates that can promote acid production of sludge are also the focus of future research.