pH对生物表面活性剂脂肽强化剩余污泥厌氧水解酸化的影响  

Effect of pH on hydrolysis and acidification of waste activated sludge anaerobic fermentation enhanced by biosurfactant surfactin

作　　者：吴至成[1] 吴琳[2] 

机构地区：[1]海南医学院附属医院,海口571102 [2]海南医学院环境生物与生态教研室,海口571199

出　　处：《环境工程学报》2016年第7期3830-3834,共5页Chinese Journal of Environmental Engineering

基　　金：海南医学院培育基金项目(HY2012-014);海南省卫生厅资助课题(琼卫2013资助-053号)

摘　　要：近年来,污泥厌氧发酵作为一种新型的污泥处理方式受到广泛关注。通过厌氧发酵,一方面污泥得以减量化,另一方面,得到能源物质短链挥发性脂肪酸(SCFA)。然而,厌氧反应中水解步骤是限制污泥厌氧发酵的关键步骤。因此,提出利用脂肽强化污泥厌氧发酵生产SCFA的方法,并探讨了pH对脂肽强化污泥水解酸化的影响。实验结果表明,碱性环境有助于进一步提高脂肽作用下污泥厌氧水解酸化速率,且最佳pH为10,此时最大SCFA积累量为286.4 mg·g^(-1)。研究表明,碱性环境能够进一步强化污泥中有机物(蛋白质和多糖)的溶出,且抑制甲烷的积累。Anaerobic fermentation has drawn much attention recently as a promising technology for waste activated sludge（ WAS） management. On one hand,it could achieve sludge reduction,and on the other hand,a short chain fatty acid（ SCFA） energy substrate can be obtained. However,hydrolysis is the limiting step in anaerobic fermentation of sludge. This study reports on an efficient approach for enhancing SCFA production from anaerobic fermentation of WAS by adding surfactin,and discusses the effect of pH on the process of hydrolysis and acidification of sludge enhanced by surfactin. Experimental results showed that alkaline conditions can further improve the rate of hydrolysis and acidification when enhanced by surfactin,and the optimal pH was 10 with the corresponding SCFA production being 286. 4 mg·g-1. The study of this mechanism revealed that alkaline conditions could improve the solubilization of protein and carbohydrate,while inhibiting methane generation.

关 键 词：剩余污泥 脂肽 厌氧发酵 PH 短链挥发性脂肪酸 

分 类 号：X705[环境科学与工程—环境工程]