城市生物质厌氧产酸构建碳源的研究进展

Review on Carbon Source Using Acidogenic Product from Municipal Biomass Fermentation

城市污水生物处理脱氮除磷阶段缺乏高效优质碳源,是国内外污水处理厂普遍面临的主要问题之一。通常采用投加外部碳源的方法提高脱氮除磷效率。常用的外加碳源包括传统的甲醇、乙酸、葡萄糖等,以及高浓度的有机废水及其发酵产物,污泥消化液等。传统投加外碳源如甲醇、乙酸、葡萄糖等成本较高,并且甲醇存在一定的毒性和运输问题。开发经济有效的新型可替代碳源成为目前新的研究热点。利用城市废弃生物质,如可生化性好的啤酒废水、淀粉废水,或城市污水厂剩余污泥的厌氧发酵产物作为污水厂外加碳源,研究发现产物中含有较多的短链挥发性脂肪酸(如乙酸、丙酸、丁酸等),其反硝化效率较单一乙酸做碳源要高,同时还可以节约碳源成本,是一种经济有效的可替代碳源。

Currently the readily degradable organic carbon source was a limiting factor for successful nitrogen and phosphorus removal from municipal wastewater.External carbon sources were used to improve the denitrification and dephosphorization efficiency.The most commonly carbon sources used in wastewater treatment plants were methanol,acetate and sugar.However considering the operational cost and related safety issues of the chemicals,new economic and effective alternative carbon sources attracted more attentions.New alternative carbon sources could be brewery wastewater,starch wastewater,and their anaerobic acidogenic products.It was reported that acidogenic products volatile fatty acids such as acetate,propionate,butyrate,which were cost saving and had higher denitrification efficiency than acetate was a kind of economic and effective alternative carbon source.