Optimization of thermal hydrolysis process for enhancing anaerobic digestion in a wastewater treatment plant with existing primary sludge fermentation

被引：0

作者：

Zhou, Peijun ^{[1
]}

Meshref, Mohamed N.A. ^{[1
,2
]}

Dhar, Bipro Ranjan ^{[1
]}

机构：

[1] Department of Civil and Environmental Engineering, University of Alberta, Edmonton,AB,T6G 1H9, Canada

[2] Public Works Department, Faculty of Engineering, Ain Shams University, 1 El Sarayat St., Abbassia, Cairo,11517, Egypt

来源：

Bioresource Technology | 2021年 / 321卷

关键词：

Anaerobic digestion;

D O I：

暂无

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学科分类号：

摘要：

Many wastewater treatment plants (WWTPs) adopted primary sludge fermentation to produce sludge liquor for the biological denitrification process. The fermented primary sludge (FPS) is usually co-digested with thickened waste activated sludge (TWAS) in the anaerobic digestion (AD) process. To date, there has been limited information on how the sludge thermal hydrolysis process (THP) could be retrofitted for enhancing AD in WWTPs with the existing primary sludge fermentation process. This study assessed two THP retrofitting schemes, (FPS + TWAS and TWAS alone) combining different exposure times (15, 30, and 60 min) and temperatures (140, 160, and 180 °C). The results suggested that temperature had more impact on sludge solubilization than exposure times. Notably, 180 °C was the most effective for sludge solubilization under both schemes. However, a higher degree of solubilization did not necessarily lead to higher methane yields. The THP of FPS + TWAS attained considerably higher methane yield than the pretreatment of TWAS alone. © 2020 Elsevier Ltd

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