화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korean Journal of Chemical Engineering, Vol.37, No.4, 663-669, April, 2020
DOI10.1007/s11814-019-0457-x  Export Citation
Alum sludge conditioning with ferrous iron/peroxymonosulfate oxidation: Characterization and mechanism
Xu Zhou, Wenbiao Jin, Lan Wang, Lin Che, Chuan Chen1, †, Shao-feng Li2, Xue-Ting Wang1, Renjie Tu, Song-Fang Han, Xiaochi Feng, and Nan-Qi Ren1
  • Shenzhen Engineering Laboratory of Microalgal Bioenergy, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China
  • 1State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China
  • 2Department of Building and Environmental Engineering, Shenzhen Polytechnic, Shenzhen 518055, China
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Alum sludge produced by drinking water plants needs to be conditioned and dewatered before final disposal. In this study, a novel ferrous iron/peroxymonosulfate (PMS) oxidation process was employed to enhance alum sludge dewaterability. The effect of oxidative sulfate radicals generated by Fe2+ activated HSO5 - on alum sludge was studied. The results showed that the optimal conditioning conditions for addition of Fe2+ and PMS were 0.5 g/g and 0.1 g/g TSS, respectively. Meanwhile, the capillary suction time (CST) and specific resistance to filtration (SRF) of alum sludge was reduced by 66% and 88%. Also found was that the absolute value of the zeta potential increased and the particle size decreased in alum sludge after Fe2+-PMS conditioning, which indicated that oxidative sulfate radicals destroyed the floc structure of alum sludge and smaller particles were generated. At the same time, the water contained in sludge flocs was released and enhanced sludge dewaterability, while leaching of aluminum ions also characterized decomposition of alum sludge.
Keywords:Water Purification Sludge;Alum Sludge;Dewaterability;Oxidative Conditioning;Ferrous-peroxymonosulfate
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