Explore the closed-loop disposal route of surplus sludge: Sludge self-circulation preparation of sludge-based biochar (SBB) to enhance sludge dewaterability

doi:10.1016/j.colsurfa.2022.128304

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	Explore the closed-loop disposal route of surplus sludge: Sludge self-circulation preparation of sludge-based biochar (SBB) to enhance sludge dewaterability
	Yang, Yahong 1; Yang, Xingfeng 1; Wang, Xuan 2; Yang, Qiyong 3; Xu, Weixin 1; Li, Yangying 1
刊名	COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
	2022-04-05
卷号	638
关键词	Excess sludge Sludge-based biochar Sludge dewatering Closed-loop disposal Extracellular polymeric substance
ISSN号	0927-7757
DOI	10.1016/j.colsurfa.2022.128304
英文摘要	Sludge-based biochar (SBB) has been used to improve excess sludge dewaterability. However, the conditionings of sludge dewaterability using SBB prepared by different methods are discrepant. Herein three SBBs (SBB0, SBB1, SBB2) were prepared by direct carbonization, ZnCl2 pre-activation and carbonization-HCl post-activation method respectively.The feasibility of SBB as sludge dewatering conditioner and the mechanism were mainly explored. The results demonstrated that all three SBBs enhance sludge dewatering. SBB1 had the best conditioning effect among all the three methods at the same dosage. SBB particles significantly reduced the compressibility of sludge and improved the porosity of sludge cake. Zeta potential analysis showed that the positive charge on the surface of SBB could neutralize the sludge flocs with negative charges, reduce the electrostatic repulsion between sludge particles, make the sludge destabilize and aggregate. The SBB characteristics exhibited a coagulant aid effect. Meanwhile, SBB promotes the dissolution of inner EPS and effectively weakens the water holding capacity of sludge flocs by adsorbing viscous macromolecules through non-covalent interactions. Sludge colloid destabilization, EPS dissolution and removal of water-holding substances played a synergistic effect in the process of weakening the affinity between water molecules and solid phase. The specific surface area, pore volume, the number and type of surface functional groups, the content of silicon and aluminum compounds of SBB1 were better than those of SBB0 and SBB2 combined with the characterization results of three SBBs.Therefore SBB1 had the best effect on sludge dewatering. The proposed closed-loop sludge disposal route by sludge self-circulation using SBB derived from wastewater treatment plants (WWTPs) is a green sustainable insight and a promising research direction.
WOS研究方向	Chemistry
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000745076000003
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/154767]
专题	土木工程学院
作者单位	1.Lanzhou Univ Technol, Sch Civil Engn, Lanzhou 730050, Gansu, Peoples R China; 2.Lanzhou Xingrong Environm Dev Co Ltd, Lanzhou 730070, Gansu, Peoples R China; 3.Jiujiang Univ, Coll Resources & Environm, Jiujiang 332005, Jiangxi, Peoples R China
推荐引用方式 GB/T 7714	Yang, Yahong,Yang, Xingfeng,Wang, Xuan,et al. Explore the closed-loop disposal route of surplus sludge: Sludge self-circulation preparation of sludge-based biochar (SBB) to enhance sludge dewaterability[J]. COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS,2022,638.
APA	Yang, Yahong,Yang, Xingfeng,Wang, Xuan,Yang, Qiyong,Xu, Weixin,&Li, Yangying.(2022).Explore the closed-loop disposal route of surplus sludge: Sludge self-circulation preparation of sludge-based biochar (SBB) to enhance sludge dewaterability.COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS,638.
MLA	Yang, Yahong,et al."Explore the closed-loop disposal route of surplus sludge: Sludge self-circulation preparation of sludge-based biochar (SBB) to enhance sludge dewaterability".COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS 638(2022).