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http://dx.doi.org/10.17137/korrae.2018.26.4.53

Effect of Waste Activated Sludge Mixing Ratio on the Biogas Production in Bioelectrochemical Anaerobic Digestion  

Chung, Jae-Woo (Department of Environmental Engineering, Gyeongnam National University of Science and Technology (GNTECH))
Lee, Myoung-Eun (Department of Environmental Engineering, Gyeongnam National University of Science and Technology (GNTECH))
Seo, Sun-Chul (Wastewater Treatment Department, Yongjin Environment Co. Ltd)
Ahn, Yongtae (Department of Energy Engineering, Gyeongnam National University of Science and Technology (GNTECH))
Publication Information
Journal of the Korea Organic Resources Recycling Association / v.26, no.4, 2018 , pp. 53-61 More about this Journal
Abstract
Anaerobic digestion (AD) is one of the most widely used process that can convert the organic fraction of waste activated sludge (WAS) into biogas. However, most researched actual methane yields of anaerobic digester (AD) on lab scale is lower than theoretical ones. Bioelectrochemical, anaerobic digester was used to increase methane yield from waste activated sludge. The influence of anaerobic digestion sludge and raw sludge mixing ratio (3:7, 5:5) on methane yield and organic matter removal efficiency were explored. As a result, when the mixing ratio of bioelectrochemical anaerobic sludge was 5:5 compared with 3:7, the highest methane yields were 294.2 mL $CH_4/L$ (0.63 times increase) and 52.5% (7.5% increase), the bioelectrochemical anaerobic digester(5:5) was more stable in the pH, t otal alkalinity and VFAs, respectively. These results showed that the increase in the mixing ratio of anaerobic digestion sludge was found to be effective for maintaining the stable performance of bioelectrochemical anaerobic digester.
Keywords
Microbial electrolysis cell (MEC); biogas production; mixing ratio; high-strength waste/wastewater;
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