EFFECT OF ACID-ALKALI MICROWAVE COMBINED PRETREATMENT ON RUPTURE OF SLUDGE EXTRACELLULAR POLYMERIC SUBSTANCES AND METHANE PRODUCTION

ZHOU Yu-han; PAN Yang; ZHANG Rui-liang; ZHENG Chao-ting; ZHI Zhong-xiang; ZHEN Guang-yin

doi:10.13205/j.hjgc.202012004

Volume 38 Issue 12

Apr. 2021

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ZHOU Yu-han, PAN Yang, ZHANG Rui-liang, ZHENG Chao-ting, ZHI Zhong-xiang, ZHEN Guang-yin. EFFECT OF ACID-ALKALI MICROWAVE COMBINED PRETREATMENT ON RUPTURE OF SLUDGE EXTRACELLULAR POLYMERIC SUBSTANCES AND METHANE PRODUCTION[J]. ENVIRONMENTAL ENGINEERING , 2020, 38(12): 19-25,31. doi: 10.13205/j.hjgc.202012004

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EFFECT OF ACID-ALKALI MICROWAVE COMBINED PRETREATMENT ON RUPTURE OF SLUDGE EXTRACELLULAR POLYMERIC SUBSTANCES AND METHANE PRODUCTION

doi: 10.13205/j.hjgc.202012004

1. Shanghai Key Lab for Urban Ecological Processes and Eco-Restoration, School of Ecological and Environmental Sciences, East China Normal University, Shanghai 200241, China;
2. Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China

Received Date: 2019-11-18
Available Online: 2021-04-23

Abstract

Abstract

Extracellular polymeric substances (EPS) are the essential components of sludge, which influence sludge dewaterability and methane productivity. In this study, the roles played by different EPS fractions in methane production of sludge were investigated. Results demonstrated that combined acid-alkali microwave pretreatment dissolved the intracellular organic matters and changed the distribution of EPS, and furthermore enhanced methanogenesis. The optimal conditions were observed to be pH=10, 500 W microwave and 120 s, and then the concentration of soluble chemical oxygen demand (SCOD) in S-EPS reached 11460 mg/L, increased by 84.5% compared with the control. The accumulative methane production approached 89.08 mL/g-VS, whose increase rate was 59.9%. At pH=10, 12, the contribution of S-EPS to methane production accounted for 16.6% and 30.4%, respectively, much higher than LB-EPS and TB-EPS. During the anaerobic digestion process, the contribution of S-EPS rapidly increased in the first four days and then slightly and constantly decreased in the following days. Therefore, acid-alkali pretreatment combined with microwave accelerated the methane production of sludge by enhancing the release of polysaccharide and protein from sludge flocs into S-EPS fraction.
- sludge,
- acid-alkali pretreatment,
- microwave,
- extracellular polymeric substances(EPS),
- anaerobic digestion,
- methane production

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References(37)

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