Systematic assessment of dredged sludge dewaterability improvement with different organic polymers based on analytic hierarchy process  

作　　者：Zhenzhen Song Hongyu Gao Wanwan Liu Liqing Li Weijun Zhang Dongsheng Wang 

机构地区：[1]Faculty of Materials Science and Chemistry,China University of Geosciences,Wuhan 430074,Hubei,China [2]State Key Laboratory of Environmental Aquatic Chemistry,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China [3]Institute for resources and environmental engineering,Shanxi University,Taiyuan 030006,Shanxi,China [4]School of Environmental Studies,China University of Geosciences,Wuhan 430074,Hubei,China

出　　处：《Journal of Environmental Sciences》2021年第5期311-321,共11页环境科学学报（英文版）

基　　金：supported by the Major Science and Technology Program for Water Pollution Control and Treatment(No.2018ZX07110004)。

摘　　要：Organic polymeric flocculants are commonly used in improving dredged sludge dewaterability, but less attention has been paid to residual water quality. In this paper, the effects of cationic etherified starch(CS) and poly-dimethyl diallyl ammonium chloride(PDDA) on dredged sludge dewatering efficiency and residual water quality of Baiyangdian lake were comprehensively investigated and evaluated by analytic hierarchy process(AHP). The results indicated that PDDA had stronger electrical effect and flocculation performance compared with CS, resulting in more efficient dewatering performance. PDDA can reduce the pollutants of discharged residual water, while CS significantly promoted the increase of NH_(4)^(+)-N and NO_(3)^(–)-N in the residual water. The increase of NH_(4)^(+)-N in the residual water of CS was due to the release of dredged sludge, while the increase of NO_(3)^(-)-N was introduced by CS leaching. AHP showed that PDDA performed better in flocculation treatment of dredged sludge than other organic polymers. This work provides a method for optimization of flocculation treatment for dredged sludge dewaterability.

关 键 词：Dredge sludge dewatering Flocculation evaluation model Residual water quality Analytic hierarchy process 

分 类 号：X703[环境科学与工程—环境工程]