Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8843780 | International Biodeterioration & Biodegradation | 2018 | 6 Pages |
Abstract
A laboratory-scale demonstration of the aquaculture effluent treatment was conducted in a system that combined a down-flow hanging sponge (DHS) reactor and a hydroponic cultivation bed (HCB). Cyprinus carpio was used as a model aquaculture fish and Cupsicum frutescens was used as a model hydroponic plant. The aquarium water was circulated through the HCB and DHS using a submerged pump. The experiment was divided into six phases in which the sodium acetate solution was supplied using different feeding patterns. The sodium acetate solution acted as a carbon source and not only eliminated nitrogen through denitrification but also increased the alkalinity through biological degradation of the acetate. Denitrification was observed to eliminate 7.7% of the total nitrogen at the inlet out of which 53.5% was converted by C. frutescens to form a fruit. The microbial community in the sludge that was retained in the DHS contained both nitrifying and denitrifying bacteria. Nitrososhaera was the dominant ammonia-oxidizing bacterium, whereas Nitrospira was the dominant nitrite-oxidizing bacterium. Further, Opitutus acted as the dominant denitrifying bacterium. No major bacterial pathogen was detected in the DHS-HCB system. The study confirmed that the DHS system provided single-stage nitrification-denitrification and that the overall DHS-HCB system provided a low-cost and high-performance aquaculture effluent treatment system that is capable of being used for safe food production.
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Authors
Daisuke Tanikawa, Yuka Nakamura, Hiromi Tokuzawa, Yuga Hirakata, Masashi Hatamoto, Takashi Yamaguchi,