Effect of the physicochemical properties of municipal sludge from different areas in China and their influence on dewatering performance
WU Chunxu1,2,, TANG Mingyue3, ZHANG Hongtao1,,, SHA Xuehua2, CHEN Zhaolin4, ZHANG Weijun3 1.School of Environment, Tsinghua University, Beijing 100084, China 2.Solid Waste Business Department, Beijing Enterprises Water Group Limited, Beijing 100102, China 3.School of Environment Studies, China University of Geoscience (Wuhan), Wuhan 430074, China 4.Beijing Guohuan Tsinghua Design and Research Institute Limited Company, Beijing 100084, China
Abstract:In this study, five typical sewage treatment plants in southern China and northern China were selected to compare floc properties, extracellular polymeric substances (EPS) and dewatering performances of sludge, respectively. The Pearson correlation analysis results showed some obvious differences in physicochemical properties and dewatering performances of sludge from sewage treatment plants in different areas. The average particle size of sludge had a positive correlation with its organic matter content. The protein content in EPS had greater influence on dewatering performance than polysaccharide. The protein content in soluble EPS (S-EPS) had the most significant effect on sludge dewatering performance (r=0.704, P<0.05). Three-dimensional fluorescence analysis and parallel factor analysis showed S-EPS contained tryptophan proteins (TPN) and humic acid (HA), while loosely-bound EPS (LB-EPS) and tightly-bound EPS (TB-EPS) contained TPN and fulvic acid (FA). This study provided new insights for sludge conditioning and dewatering. Key words:municipal sludge/ dewatering performance/ physicochemical properties of sludge/ regional disparity/ protein in EPS.
图1不同地区污水处理厂污泥样品脱水性能 Figure1.Dewatering performance of sludge samples from sewage treatment plants in different regions
ZHANG W, TANG M, YANG P, et al. Micro-interfacial mechanisms on sludge dewaterability enhancement using cerium chloride for preparation of carbon-based functional material[J]. Journal of Hazardous Materials, 2020, 386: 121930.
[6]
CAO B, ZHANG W, WANG Q, et al. Wastewater sludge dewaterability enhancement using hydroxyl aluminum conditioning: Role of aluminum speciation[J]. Water Research, 2016, 105(15): 615-624.
[7]
ZHANG W, PENG S, XIAO P, et al. Understanding the evolution of stratified extracellular polymeric substances in full-scale activated sludges in relation to dewaterability[J]. RSC Advances, 2014, 5(2): 1282-1294.
[8]
AI J, ZHANG W, CHEN F, et al. Catalytic pyrolysis coupling to enhanced dewatering of waste activated sludge using KMnO4Fe(II) conditioning for preparing multi-functional material to treat groundwater containing combined pollutants[J]. Water Research, 2019, 158: 424-437.
CURVERS D, USHER S P, KILCULLEN A R, et al. The influence of ionic strength and osmotic pressure on the dewatering behaviour of sewage sludge[J]. Chemical Engineering Science, 2009, 64(10): 2448-2454.
[11]
LI X Y, YANG S F. Influence of loosely bound extracellular polymeric substances (EPS) on the flocculation, sedimentation and dewaterability of activated sludge[J]. Water Research, 2007, 41(5): 1022-1030.
HOUGHTON J I, STEPHENSON T. Effect of influent organic content on digested sludge extracellular polymer content and dewaterability[J]. Water Research, 2002, 36(14): 3620-3628.
ZHANG W, YANG P, YANG X, et al. Insights into the respective role of acidification and oxidation for enhancing anaerobic digested sludge dewatering performance with Fenton process[J]. Bioresource Technology, 2015, 181: 247-253.
HENDERSON R K, BAKER A, MURPHY K R, et al. Fluorescence as a potential monitoring tool for recycled water systems: A review[J]. Water Research, 2009, 43(4): 863-881.
[18]
YU G H, HE P J, SHAO L M. Novel insights into sludge dewaterability by fluorescence excitation-emission matrix combined with parallel factor analysis[J]. Water Research, 2010, 44(3): 797-806.
[19]
FENG X, DENG J, LEI H, et al. Dewaterability of waste activated sludge with ultrasound conditioning[J]. Bioresource Technology, 2009, 99(3): 1074-1081.
1.School of Environment, Tsinghua University, Beijing 100084, China 2.Solid Waste Business Department, Beijing Enterprises Water Group Limited, Beijing 100102, China 3.School of Environment Studies, China University of Geoscience (Wuhan), Wuhan 430074, China 4.Beijing Guohuan Tsinghua Design and Research Institute Limited Company, Beijing 100084, China Received Date: 2020-01-13 Accepted Date: 2020-10-24 Available Online: 2021-01-13 Keywords:municipal sludge/ dewatering performance/ physicochemical properties of sludge/ regional disparity/ protein in EPS Abstract:In this study, five typical sewage treatment plants in southern China and northern China were selected to compare floc properties, extracellular polymeric substances (EPS) and dewatering performances of sludge, respectively. The Pearson correlation analysis results showed some obvious differences in physicochemical properties and dewatering performances of sludge from sewage treatment plants in different areas. The average particle size of sludge had a positive correlation with its organic matter content. The protein content in EPS had greater influence on dewatering performance than polysaccharide. The protein content in soluble EPS (S-EPS) had the most significant effect on sludge dewatering performance (r=0.704, P<0.05). Three-dimensional fluorescence analysis and parallel factor analysis showed S-EPS contained tryptophan proteins (TPN) and humic acid (HA), while loosely-bound EPS (LB-EPS) and tightly-bound EPS (TB-EPS) contained TPN and fulvic acid (FA). This study provided new insights for sludge conditioning and dewatering.