Role of extracellular polymeric substances in anaerobic granular sludge: Assessing dewaterability during Fe(II)-peroxydisulfate conditioning and granulation processes

JOURNAL OF CLEANER PRODUCTION

卷:286

Article

Ding, Wanqing^1,2  Jin, Wenbiao^1,2  Zhou, Xu^1,2  Yang, Qinhui¹  Chen, Chuan²  Wang, Qilin³ 

[1] Harbin Inst Technol Shenzhen, Shenzhen Engn Lab Microalgal Bioenergy, Shenzhen 518055, Peoples R China

[2] Harbin Inst Technol, Sch Environm, State Key Lab Urban Water Resource & Environm, Harbin 150090, Peoples R China

[3] Univ Technol Sydney, Ctr Technol Water & Wastewater, Sch Civil & Environm Engn, Ultimo, NSW 2007, Australia

关键词: Sludge dewaterability;    Anaerobic granular sludge;    Peroxydisulfate;    Granulation;    Extracellular polymeric substances;   

DOI  :  10.1016/j.jclepro.2020.124968

来源: Elsevier

【 摘 要 】

In this study, Fe(II) activated peroxydisulfate (PDS) conditioning and sludge granulation were conducted to investigate the dewaterability of anaerobic granular sludge (AGS). After Fe(II)-PDS conditioning, the dewaterability of three AGS from different sources was enhanced. The specific resistance to filtration (SRF) reduction rates were achieved (98.30% +/- 0.19%, 99.51% +/- 0.17% and 96.47% +/- 1.25%, respectively) under the optimal Fe(II) and PDS additions; And the optimal reductions of capillary suction time (CST) were 93.49% +/- 2.49%, 95.33% +/- 0.02% and 88.04% +/- 2.95%, respectively. The mechanism of improving AGS dewaterability by Fe(II)-PDS conditioning was proposed. The radical SO4 center dot-=OH center dot destroyed the structure of extracellular polymeric substances (EPS) layers and microbial cells, resulting in the bound water released from AGS. Thereafter, the generated Fe(III) facilitated the sludge re-flocculation and decreased the electrostatic repulsion. During a 132-day granulation, the CST value showed a positive correlation with protein (S-EPS), polysaccharide and zeta potential, and a negative correlation with protein (LB-EPS), protein (TB-EPS), particle size and VSS. Collectively, the protein was the primary component in AGS and showed a strong correlation with dewaterability. The variations of protein in TB-EPS during the conditioning and the granulation were consistent with the changes of sludge dewaterability. (C) 2020 Elsevier Ltd. All rights reserved.

【 授权许可】

Free