Overview of key operation factors and strategies for improving fermentative volatile fatty acid production and product regulation from sewage sludge |
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| Authors: | Wei Fang Xuedong Zhang Panyue Zhang Jijun Wan Hongxiao Guo Dara SM Ghasimi Xavier Carol Morer Tao Zhang |
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| Institution: | State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China;Department of Water Management, Section Sanitary Engineering, Delft University of Technology, PO Box 5048, 2600 GA Delft, the Netherlands;School of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China;Key Laboratory of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an 710055, China;Department of Civil Engineering, University of Kurdistan Hewl(e)r, Erbil, Kurdistan Region, Iraq;Institut Quimíc de Sarrià, Universitat Ramon Llull, Via Augusta 390, E-08017 Barcelona, Spain |
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| Abstract: | In recent years, volatile fatty acid (VFA) production through anaerobic fermentation of sewage sludge, instead of methane production, has been regarded as a high-value and promising roadmap for sludge stabilization and resource recovery. This review first presents the effects of some essential factors that influence VFA production and composition. In the second part, we present an extensive analysis of conventional pretreatment and co-fermentation strategies ultimately addressed to improving VFA production and composition. Also, the effectiveness of these approaches is summarized in terms of sludge degradation, hydrolysis rate, and VFA production and composition. According to published studies, it is concluded that some pretreatments such as alkaline and thermal pretreatment are the most effective ways to enhance VFA production from sewage sludge. The possible reasons for the improvement of VFA production by different methods are also discussed. Finally, this review also highlights several current technical challenges and opportunities in VFA production with spectrum control, and further related research is proposed. |
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| Keywords: | Corresponding authors Sewage sludge Anaerobic digestion VFA production Pretreatment Co-fermentation |
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