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Bioelectrochemical enhancement of the anaerobic digestion of thermal-alkaline pretreated sludge in microbial electrolysis cells

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  • Xiao, Benyi
  • Chen, Xia
  • Han, Yunping
  • Liu, Junxin
  • Guo, Xuesong

Abstract

Batch experiments were conducted to study bioelectrochemical enhancement of the anaerobic digestion of thermal-alkaline-pretreated sludge in single-chamber membrane-free microbial electrolysis cells (MECs) with different applied voltage. Experimental results showed bioelectrochemical method could be combined with thermal-alkaline pretreatment to enhance anaerobic digestion of sludge. The methane productions of thermal-alkaline pretreated sludge increased by 20.0%–79.3% when applied voltage was 0.6–1.8 V. The optimal applied voltage was determined as 1.8 V. Water electrolysis did not occur during test under these applied voltages. The removal rates of SCOD and sludge VSS were increased by the applied voltages, with enhanced rates of 2.6–27.6% and 17.1–51.3%, respectively. These applied voltages could enhance the growth of hydrogenotrophic methanogens and inhibit a portion of acetoclastic methanogens. High voltage (up to 1.8 V) was required to produce more methane and reduce more sludge in anaerobic digestion of thermal-alkaline-pretreated sludge when the electrodes of MECs were constructed with special material (Ti/Ru alloy) with a large distance (2 cm).

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  • Xiao, Benyi & Chen, Xia & Han, Yunping & Liu, Junxin & Guo, Xuesong, 2018. "Bioelectrochemical enhancement of the anaerobic digestion of thermal-alkaline pretreated sludge in microbial electrolysis cells," Renewable Energy, Elsevier, vol. 115(C), pages 1177-1183.
    • Handle: RePEc:eee:renene:v:115:y:2018:i:c:p:1177-1183
    DOI: 10.1016/j.renene.2017.06.043
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    1. Liu, Wenzong & Cai, Weiwei & Guo, Zechong & Wang, Ling & Yang, Chunxue & Varrone, Cristiano & Wang, Aijie, 2016. "Microbial electrolysis contribution to anaerobic digestion of waste activated sludge, leading to accelerated methane production," Renewable Energy, Elsevier, vol. 91(C), pages 334-339.
    2. Zhen, Guangyin & Lu, Xueqin & Kobayashi, Takuro & Li, Yu-You & Xu, Kaiqin & Zhao, Youcai, 2015. "Mesophilic anaerobic co-digestion of waste activated sludge and Egeria densa: Performance assessment and kinetic analysis," Applied Energy, Elsevier, vol. 148(C), pages 78-86.
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    1. Amro Hassanein & Freddy Witarsa & Stephanie Lansing & Ling Qiu & Yong Liang, 2020. "Bio-Electrochemical Enhancement of Hydrogen and Methane Production in a Combined Anaerobic Digester (AD) and Microbial Electrolysis Cell (MEC) from Dairy Manure," Sustainability, MDPI, vol. 12(20), pages 1-12, October.
    2. Kong, Fanying & Ren, Hong-Yu & Pavlostathis, Spyros G. & Nan, Jun & Ren, Nan-Qi & Wang, Aijie, 2020. "Overview of value-added products bioelectrosynthesized from waste materials in microbial electrosynthesis systems," Renewable and Sustainable Energy Reviews, Elsevier, vol. 125(C).
    3. Shabib, Ahmad & Abdallah, Mohamed & Shanableh, Abdallah & Sartaj, Majid, 2022. "Effect of substrates and voltages on the performance of bio-electrochemical anaerobic digestion," Renewable Energy, Elsevier, vol. 198(C), pages 16-27.
    4. Chen, Hong & Yi, Hao & Li, Hechao & Guo, Xuesong & Xiao, Benyi, 2020. "Effects of thermal and thermal-alkaline pretreatments on continuous anaerobic sludge digestion: Performance, energy balance and, enhancement mechanism," Renewable Energy, Elsevier, vol. 147(P1), pages 2409-2416.
    5. Xu, Xi-Jun & Wang, Wan-Qiong & Chen, Chuan & Xie, Peng & Liu, Wen-Zong & Zhou, Xu & Wang, Xue-Ting & Yuan, Ye & Wang, Ai-Jie & Lee, Duu-Jong & Yuan, Yi-Xing & Ren, Nan-Qi, 2020. "The effect of PBS on methane production in combined MEC-AD system fed with alkaline pretreated sewage sludge," Renewable Energy, Elsevier, vol. 152(C), pages 229-236.
    6. Kovalev, Andrey A. & Kovalev, Dmitriy A. & Zhuravleva, Elena A. & Katraeva, Inna V. & Panchenko, Vladimir & Fiore, Ugo & Litti, Yuri V., 2022. "Two-stage anaerobic digestion with direct electric stimulation of methanogenesis: The effect of a physical barrier to retain biomass on the surface of a carbon cloth-based biocathode," Renewable Energy, Elsevier, vol. 181(C), pages 966-977.

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