Effects of alkali, autoclaving, and Fe+ autoclaving pretreatment on anaerobic digestion performance of coking sludge fro
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RESEARCH ARTICLE
Effects of alkali, autoclaving, and Fe+ autoclaving pretreatment on anaerobic digestion performance of coking sludge from the perspective of sludge extracts and methane production Zhao Yang 1 & Xiaoyue Kang 1 & Ben Chen 1 & Guanglei Qiu 1 & Jingyue Wei 1,2 & Fusheng Li 1,2 & Chaohai Wei 1 Received: 29 January 2020 / Accepted: 15 October 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Pretreatment of activated sludge is an important step in increasing the reaction speed during anaerobic digestion by accelerating the hydrolysis process. It is necessary not only to analyze the changes in the general properties of the sludge before and after pretreatment but also to further analyze and evaluate the sludge structure and extracellular polymeric substances (EPS). In this study, the changes in coking sludge extracts after pretreatments with alkali, autoclaving, and Fe+ autoclaving were analyzed and compared using EPS heat extraction method. Moreover, the methane production potential of the pretreated coking sludge was investigated via biochemical methane potential (BMP) test. The results showed that after alkali, autoclaving, and Fe+ autoclaving, the concentration of protein and polysaccharide in the bound sludge extract accounted for approximately 40% and 28%, 62% and 51%, and 66% and 83% of the total protein and polysaccharide extracted from the sludge, respectively. In the experiment without pretreatment, there is no phenomenon of gas production from coking sludge. According to the BMP test results, Fe+ autoclaving pretreatment showed the highest methane production of 257 mL/gVSS. This study revealed that the analysis of sludge extracts was necessary in assessing the effects of anaerobic digestion pretreatment and methanogenic potential. Moreover, coking sludge showed higher methanogenic potential after Fe+ autoclaving pretreatment. Keywords Sludge structure . Extracellular polymeric substances . Biochemical methane potential . Protein . Polysaccharides . Scanning electron microscope
Introduction There has been a huge contradiction between rapid economic growth and high-carbon dioxide emissions. The only direction for development is the transition to low-carbon and sustainable energy systems, especially renewable energy (Wang and
Li 2016). China has a huge potential for renewable energy, and integrating renewable energy into future energy systems is crucial and significant (Zhang et al. 2017). Biomass has been considered as the most common source of renewable energy in the future (Tan et al. 2019). Anaerobic digestion is an ideal method for treating biomass waste (Perea-Moreno et al. 2019).
Responsible Editor: Ta Yeong Wu * Chaohai Wei [email protected]
Jingyue Wei [email protected]
Zhao Yang [email protected]
Fusheng Li [email protected]
Xiaoyue Kang [email protected] 1
School of Environment and Energy, South China University of Technology, Guangzhou 510006, People’s Republic of China
2
River Basin Research Center, Gifu University, 1-1 Yanagido, Gifu 501-11
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