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Received November 20, 2019
Accepted February 17, 2020
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
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Improving primary sludge dewaterability by oxidative conditioning process with ferrous ion-activated peroxymonosulfate
Xu Zhou1
Wenbiao Jin1
Lan Wang1
Wanqing Ding1
Chuan Chen2†
Xijun Xu2
Renjie Tu1
Song-Fang Han1
Xiaochi Feng1
Duu-Jong Lee3 4
1Shenzhen Engineering Laboratory of Microalgal Bioenergy, Harbin Institute of Technology (Shenzhen), 518055 Shenzhen, China 2State Key Laboratory of Urban Water Resource and Environment (SKLUWRE), Harbin Institute of Technology, 150001, Harbin, China 3Department of Chemical Engineering, National Taiwan University, Taipei 106, Taiwan 4Department of Chemical Engineering, National Taiwan University of Science and Technology, Taipei 106, Taiwan
cchen@hit.edu.cn
Korean Journal of Chemical Engineering, September 2020, 37(9), 1498-1506(9), 10.1007/s11814-020-0517-2
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Abstract
Enhancement of sludge dewaterability is key for sludge management and disposal of wastewater treatment plants (WWTP). In this study, the Fe2+-peroxymonosulfate (PMS) conditioning approach was first used to oxidize the primary sludge from the primary sedimentation tank of a full scale WWTP. The combination of Fe2+ (0.05-0.5 g/g TSS) and PMS (0.05-0.5 g/g TSS) could significantly improve the dewaterability of primary sludge. The optimal addition amount of Fe2+ and PMS was 0.1 g/g TSS and 0.25 g/g TSS, respectively, under which the capillary suction time (CST) and specific resistance to filtration (SRF) of the sludge was reduced by 79% and 95%. The physicochemical properties (particle size, zeta potential, EPS composition) of the primary sludge before and after oxidative conditioning were measured. Results showed that sulfate radicals generated from Fe2+-PMS system effectively reduced organic matter in different EPS fractions, further destroying sludge floc cells. Then the bound water in the sludge flocs was released, thereby improving the sludge dewaterability. The microscopic morphology also indicated that the sludge flocs have a blocky structure with tight texture before conditioning. After conditioning, the sludge flocs become smaller, and many irregular pores are formed on the surface, which facilitates the passage of internal moisture. Economic analysis showed that Fe2++PMS conditioning is more economical than the traditional Fenton method.
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Sun F, Xiao K, Zhu W, Withanage N, Zhou Y, Water Res., 130, 208 (2018)
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Zhen GY, Lu XQ, Niu J, Su LH, Chai XL, Zhao YC, Li YY, Song Y, Niu DJ, Chem. Eng. J., 233, 274 (2013)
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Liu C, Wu B, Chen XE, Xie S, Chem. Pap., 71, 2343 (2017)
