Characterization of dewatering process of activated sludge assisted by cationic surfactants |
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| Institution: | 1. CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science & Technology of China, Hefei 230026, China;2. Collaborative Innovation Center of Suzhou Nano Science and Technology, University of Science & Technology of China, Hefei 230026, China;1. College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China;2. Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China;3. Centre for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology Sydney, Sydney, NSW 2007, Australia;4. School of Energy Science and Engineering, Central South University, Changsha 410083, PR China;1. School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, PR China;2. Universtar Science & Technology (Shenzhen) Co., Ltd., Shenzhen, Guangdong, 518057, PR China;1. College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan, China;2. Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, China;3. Section for Sustainable Biotechnology, Aalborg University Copenhagen, Denmark;4. School of Mechanical Engineering and Automation, Northeastern University, Shenyang, China;5. State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology (SKLUWRE, HIT), Harbin, China |
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| Abstract: | In this work, the dewatering of activated sludge assisted by cationic surfactants was investigated. Dose of dodecyl trimethyl ammonium bromide (DTAB) and cetyl trimethyl ammonium bromide (CTAB) resulted in the release of extracellular polymeric substances (EPS) from sludge and decrease in sludge negative charge. The surfactants significantly promoted sludge dewaterability, as reflected by decreased specific resistance of filtration (SRF) and water content in sludge cakes. The treated sludge were analyzed by combined use of differential scanning calorimetry (DSC), thermo gravimetric analysis (TGA) and Brunauer–Emmett–Teller (BET) analysis. CTAB was found more effective in releasing bound water from sludge than DTAB, due to its superior surface activity and strong adsorption/bridge capacities with sludge. The specific surface area and pore size of sludge cakes declined after surfactant treatment, indicating an enhanced compressibility. With these results, the surfactant-assisted dewatering mechanism could be attributed to the integrated effects of electrostatic neutralization, enhanced compaction and release of EPS and bound water. Our study clearly characterizes the accelerated dewatering process assisted by cationic surfactants, and demonstrates that cationic surfactants could be used as a potential agent for sludge dewatering. |
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| Keywords: | Cationic surfactant Dewatering Adsorption Filtration Separation Waste-water treatment |
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