Key factors governing alkaline pretreatment of waste activated sludge

作     者：Xianli Shi Li Deng Fangfang Sun Jieyu Liang Xu Deng 

作者机构：College of Life Sciences Shenzhen Key Laboratory of Marine Bioresources and Ecology Shenzhen University 

出 版 物：《Chinese Journal of Chemical Engineering》 (中国化学工程学报（英文版）)

年 卷 期：2015年第23卷第5期

页      面：842-846页

核心收录：

学科分类：0710[理学-生物学] 083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 082903[工学-林产化学加工工程] 0817[工学-化学工程与技术] 08[工学] 0829[工学-林业工程] 0703[理学-化学] 082201[工学-制浆造纸工程] 0822[工学-轻工技术与工程] 

基　　金：the National Natural Science Foundation of China(51078234) Shenzhen R&D fund(JCYJ20140418193546101) Shenzhen University R&D fund(T201203) 

主　　题：Waste activated sludge Alkaline pretreatment Waste treatment Optimization Biodegradation Bioprocess design 

摘      要：Alkaline pretreatment is an effective technology to disintegrate sewage sludge, where alkali dosage and sludge concentration are two important factors. p H value or alkali concentration is usually adjusted in order to determine a proper dosage of alkali. Our work has found that this is not a good strategy. A new parameter, the ratio of alkali to sludge(Ra/s), is more sensitive in controlling the alkali dosage. The sludge concentration Csand retention time t are two other important factors to consider. The validity of these arguments is confirmed with modeling and experiments. The individual effect of Ra/s, Csand t was studied separately. Then the combined effect of these three factors was evaluated. The sludge disintegration degree of 44.7% was achieved with the optimized factors. Furthermore, an alkaline-microwave combined pretreatment process was carried out under these optimized conditions. A high disintegration degree of 62.3% was achieved while the energy consumption of microwave was much lower than previously reported.