文献类型：期刊文献

英文题名：Hydrocyclone breakage of activated sludge to exploit internal carbon sources and simultaneously enhance microbial activity

作者：Xu, Yinxiang[1,2];Wang, Hualin[1];Wang, Zhenhua[1];Fang, Yuanyuan[1];Liu, Yi[1];Zeng, Tao[2];Liu, Zhongbin[2];Liu, Ming[2]

机构：[1]East China Univ Sci & Technol, Natl Engn Lab Ind Wastewater Treatment, 130 Meilong Rd, Shanghai 200237, Peoples R China;[2]Sichuan Univ Sci & Engn, Sichuan Engn Lab Resource Utilizat Mine Tailings, Zigong 643000, Sichuan, Peoples R China

年份：2018

卷号：117

起止页码：651

外文期刊名：PROCESS SAFETY AND ENVIRONMENTAL PROTECTION

收录：;EI(收录号：20182605365098);WOS:【SCI-EXPANDED(收录号:WOS:000446134900061)】；

基金：This work is financially surpported by the Key Research and Development Program of Sichuan Provincial Department of Science and Technology (2017SZ0167), the National Science Fund for Distinguished Young Scholars of China (51125032), the Research Program of Key Lab of Process Equipment and Control Engineering of Sichuan Province (GK201704), the Special Project for Young Science and Technology Innovation Team in Sichuan Province (2017TD0027), and the Key Science and Technology Program of Zigong (2016SF02).

语种：英文

外文关键词：Hydrocyclone breakage; Activated sludge; Carbon source; Microbial activity; Shear force

摘要：Breaking activated sludge (AS) for organic compounds as supplemental carbon sources is beneficial for enhanced nitrogen removal from wastewater with low carbon/nitrogen ratios, but it is usually limited by the severe deterioration of microbial activity in wastewater treatment systems. In this paper, the hydrocyclone breakage method was proposed to treat AS to release carbon sources and simultaneously enhance microbial activity. The effects of hydrocyclone breakage on carbon sources release and physicochemical properties of AS were emphatically investigated through various batch experiments. The results indicated that the internal carbon sources were effectively released from AS after hydrocyclone breakage, and the soluble chemical oxygen demand (SCOD) and polysaccharides concentrations were increased by over 100% at higher inlet flow rates of the hydrocyclone. Importantly, the sludge aggregates were broken into smaller pieces which still had a good settleability and low expansibility in wastewater treatment systems. The denitrification rate of AS improved 45.5% after hydrocyclone treatment. Meanwhile, extra cellular polymeric substances (EPS) on AS surfaces and porous channels were also cleaned by shearing exfoliation and centrifugal desorption. Therefore, the hydrocyclone breakage for AS showed great advantages in releasing partial carbon sources and synchronously enhancing microbial activity of survival microorganism for advanced nitrogen removal. (C) 2018 Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.