[KSCI] Korea Science Citation Index Service

http://dx.doi.org/10.17137/Korrae.2013.21.3.43

Effects of diverse Pre-treatment methods on the sludge digestion and methane production in combined mesophilic anaerobic and thermophilic aerobic sludge digestion process

Ha, Jeong Hyub (Department of Chemical Engineering, Pohang University of Science and Technolog)
Park, Jong Moon (Division of Advanced Nuclear Engineering, Pohang University of Science and Technolog)
Park, Sang Kyu (Department of Chemical Engineering, Pohang University of Science and Technolog)
Cho, Hyun Uk (School of Environmental Engineering, Pohang University of Science and Technolog)
Jang, Hyun Min (School of Environmental Engineering, Pohang University of Science and Technolog)
Choi, Suk Soon (Department of Biological and Environmental Engineering, Semyung University)

Publication Information

Journal of the Korea Organic Resources Recycling Association / v.21, no.3, 2013 , pp. 43-52 More about this Journal

Abstract

In this study, various influent sludge pre-treatment methods were adopted to investigate their effects on the sludge digestion and methane production in combined mesophilic anaerobic and thermophilic aerobic sludge digestion process. A lab-scale sewage sludge digestion process was operated during 4 phases using different feed sludge pre-treatment strategies. In phase 1, feed sludge was supplied without any pre-treatment. In contrast, in phases 2, 3 and 4, thermal, thermal-alkaline and long time alkaline treatment (7 days) were applied to influent sludge, respectively. With sludge pre-treatment, TCOD removal was drastically increased from 44% to 76% from phases 1 to 4, respectively. Also, pre-treatment of feed sludge significantly improved the methane production rate of MAD, showing an increment from 101 to 165-256mL/L/day. Meanwhile, TCOD removal and methane production at phase 4 were not increased, compared to those at phase 3. Based on the experimental results, it was concluded that pre-treatment of feed sludge significantly increases the efficiency of sludge digestion and thermal-alkaline method was the most effective method among the pre-treatment methods examined.

Keywords

Sludge removal; methane production; sludge pre-treatment; combined sludge; digestion process;

Citations & Related Records

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