Statistical analyses of operating conditions and power consumption characteristics in small-scale conventional activated sludge plants for sewage treatment
In: Environmental technology, Jg. 21 (2000), Heft 10, S. 1167-1172
academicJournal
- print, 6 ref
Zugriff:
Energy efficiency is one of the important factors that should be taken into account when selecting a treatment method of wastewater. In this study, the present status of the operating conditions (hydraulic retention time, aeration amount and BOD loading) and energy consumption characteristics of small-scale conventional activated sludge plants for sewage treatment in Japan was clarified through statistical analyses. A small-scale sewage plant was defined as one with a real influent flow-rate of sewage less than 5000 m3/d in this study. The analytical results showed that the small-scale activated sludge plants investigated in this study had very good performance of BOD and COD removals but poor energy efficiency. The total power consumption in the small-scale activated sludge plants averaged at 1.0 kWh/m3, which was twice as high as the average value for all of the sewage plants in Japan. It was demonstrated that the working efficiency of an activated sludge plant, defined as the ratio of real influent flow rate to its capacity (designed value of influent flow rate), was the most important factor controlling the energy efficiency. Lower working efficiency significantly brought down the energy effidency of an activated sludge plant. Optimal design of the capacity of activated sludge plants is strongly desired to have higher energy efficiency in sewage treatment.
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Statistical analyses of operating conditions and power consumption characteristics in small-scale conventional activated sludge plants for sewage treatment
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Autor/in / Beteiligte Person: | HU, H.-Y ; GOTO, N ; FUJIE, K |
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Zeitschrift: | Environmental technology, Jg. 21 (2000), Heft 10, S. 1167-1172 |
Veröffentlichung: | London: Selper, 2000 |
Medientyp: | academicJournal |
Umfang: | print, 6 ref |
ISSN: | 0959-3330 (print) |
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