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Technology and Engineering
- ISSN: 2333-2581
- Modern Environmental Science and Engineering
The Basic Study on the Energy Potential Flow Analysis of a Sewage Treatment Plant
Toshiki Fukushima
METAWATER Co., Ltd, Technology Strategy Department Business Strategy Division, JR Kanda Manseibashi Bldg, 1-25,
Kandasudacho, Chiyoda-ku, Tokyo, 101-0041, Japan
Abstract: To improve the independent generation of electric power by utilizing the organics in sewage influent an analysis was made of the behavior of organics within the plant, together with electric power consumption, in the form of energy flow. The energy potential was calculated from COD, and the behavior in each process was studied. About 10% of the energy potential could be recovered (4% in the form of electric power) through power generation with digestion gas, but most of the energy potential was lost in mineralization in the aeration tank and incinerator. Methods that could be used to raise electric power independence were evaluated in terms of “COD concentration necessary for independence.” Estimated values compared to 5800 mg/L in the case of a normal primary settling tank were as follows: 2800 mg/L (51% down) when the high-efficiency solids-liquid separation was introduced; 1800 mg/l (69% down) when activated carbon from sludge was charged. It may be concluded that electric power independence is difficult to achieve with any single method, but it might be achieved when these methods are combined.
Key words: energy independence, energy potential, organic matter, sewage treatment plant
