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A comparative study on the alternating mesophilic and thermophilic two-stage anaerobic digestion of food waste

Journal of Environmental Sciences 2014年第6期26卷 1274-1283页

作者： Jey-R Sabado Ventura Jehoon Lee deokjin jahng Department of Environmental Engineering and Energy Myongji University

An alternating mesophilic and thermophilic two stage anaerobic digestion （AD） process was conducted. The temperature of the acidogenic （A） and methanogenic （M） reactors was controlled as follows： System 1 （S1） mesophilic A-mesophilic M; （S2） mesophilic A-thermophilic M; and （S3） thermophilic A-mesophilic M. Initially, the AD reactor was acclimatized and inoculated with digester sludge. Food waste was added with the soluble chemical oxygen demand （SCOD） concentrations of 41.4-47.0 g/L and volatile fatty acids of 2.0-3.2 g/L. Based on the results, the highest total chemical oxygen demand removal （86.6%） was recorded in S2 while S3 exhibited the highest SCOD removal （96.6%）. Comparing S1 with S2, total solids removal increased by 0.5%;S3 on the other hand decreased by 0.1% as compared to S1. However, volatile solids （VS） removal in S1, S2, and S3 was 78.5%, 81.7%, and 79.2%, respectively. S2 also exhibited the highest CH4 content, yield, and production rate of 70.7%, 0.44 L CH4/g VSadded, and 1.23 L CH4/（***）, respectively. Bacterial community structure revealed that the richness, diversity, evenness, and dominance of S2 were high except for the archaeal community. The terminal restriction fragments dendrogram also revealed that the microbial community of the acidogenic and methanogenic reactors in S2 was distinct. Therefore, S2 was the best among the systems for the operation of two-stage AD of food waste in terms of CH4 production, nutrient removal, and microbial community structure.

关键词： community structure food waste methane production nutrient removal two-stage anaerobic digestion

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Sustainable water management for green infrastructure

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Journal of Environmental Sciences 2014年第6期26卷 1213-1213页

作者： Kim Lee Hyung Yun Zuwhan Park Joonhong Hong Seungkwan Kim Sungpyo Yi Qitao Wang Xiaoyan Li Yingxia jahng deokjin Yeom Ick Tae Kang Joohyon Maniquiz-Redillas Maria Stenstrom Michael Wirojanagud Wanpen Tsai Frank Kongju National University Korea Korea University Korea Yonsei University Korea Anhui University of Science and Technology Capital Normal University Beijing Normal University Myongji University Korea Sungkunkwan University Korea Dongguk University Korea University of California USA Los Angeles KhonKaen University Thailand Louisiana State University USA

The water is the most important component in the ecosystems responsible for energy flow and mass transport. The water also plays an important role for human existence. However, the constructed infrastructures such as roads, buildings, railways, drainage systems, etc. give negative impacts to the ecosystem such as deteriorating the water quality and changing the natural water circulation system.

关键词： Sustainable water management for green infrastructure

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