Fate of extracellular polymeric substances of anaerobically digested sewage sludge during pre-dewatering conditioning with Acidithiobacillus ferrooxidans culture

被引：23
|
作者：
Murugesan, Kumarasamy [1 ,3 ]
Ravindran, Balasubramani [1 ]
Selvam, Ammaiyappan [1 ,2 ]
Kurade, Mayur B. [1 ]
Yu, Shuk-Man [1 ,2 ]
Wong, Jonathan W. C. [1 ,2 ]
机构：
[1] Hong Kong Baptist Univ, Sinoforest Appl Res Ctr Pearl River Delta Environ, Hong Kong, Hong Kong, Peoples R China
[2] Hong Kong Baptist Univ, Dept Biol, Hong Kong, Hong Kong, Peoples R China
[3] Periyar Univ, Dept Environm Sci, Salem, India
来源：
BIORESOURCE TECHNOLOGY | 2016年 / 217卷
关键词：
Acidithiobacillus ferrooxidans; Anaerobically digested sludge; Bioflocculant; Sludge dewaterability; Extracellular polymeric substances; ACTIVATED-SLUDGE; ENHANCED DEWATERABILITY; RAW-MATERIAL; EPS; FLOCCULATION; REMOVAL; METALS;
D O I：
10.1016/j.biortech.2016.03.081
中图分类号：
S2 [农业工程];
学科分类号：
0828 ;
摘要：
This study investigated the fate of extracellular polymeric substances (EPS) of anaerobically digested saline sewage sludge during its preconditioning. Sludge was conditioned with Acidithiobacillus ferrooxidans (AF) culture for 24 h in the presence and absence of Fe2+ as an energy substrate. pH decreased from 7.24 to 3.12 during sludge conditioning process. The capillary suction time (CST) of conditioned sludge significantly decreased to <10 s, and specific resistance to filtration (SRF) was reduced by >94% as compared with control within 4 h of conditioning with or without Fe2+, indicating a significant (P < 0.001) improvement in sludge dewaterability. A noticeable decrease in extractable EPS was observed in conditioned sludge. The EPS contents showed a significant negative correlation with dewaterability of sludge (P < 0.05). The results suggest that bioacidification treatment using A. ferrooxidans effectively improved sludge dewaterability through modification of sludge EPS. (C) 2016 Published by Elsevier Ltd.
引用
收藏
页码：173 / 178
页数：6
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