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Sewage treatment in an oxidation ditch plant on Kita-shiga heights [Japan]
1989
Ozawa, H. (Nagano-ken. Research Inst. for Health and Pollution (Japan)) | Suzuki, T. | Itoh, S. | Matsui, M. | Furihata, A.
The removal of organics and nitrogen was investigated in a sewage treatment plant by oxidation ditch process. Influent and effluent samples were taken each month for the 2-year period and examined. The wastewater with average BOD value of 240 mg/l was treated in an oxidation ditch at a periodical average MLSS concentration of 3,100 mg/l. Average BOD of the effluent was 19 mg/l and BOD removal averaged 94%. Average total-N in the effluent was 11 mg/l, the bulk of which was composed of Kjeldhal-N, and nitrogen removal averaged 74%. Alkalinity reduction was about 3 mgCaCO3/l per apparent decrease of 1 mg/l ammonia-N, though the theoretical value by nitrification is 7.14 mgCaCO3/l, and no large pH drop was observed in the effluent. Alkalinity loss by nitrification was considered to be mitigated by generation of alkalinity by deamination and denitrification. Apparent 50% ammonia-N removal corresponded to the residual alkalinity of 110 mgCaCO3/l.
Mostrar más [+] Menos [-]In situ immobilization of heavy-metal-contaminated soils
1989
Czupyrna, G.
Air pollution modeling and its application VII
1989
Dop, H. van (Han)
Scientific monitoring strategies for ocean waste disposal
1989
Hood, D. W. (Donald Wilbur) | Schoener, Amy | Park, P. Kilho (Paul Kilho)
Effects of air pollution on western forests
1989
Olson, Richard K. | Lefohn, Allen S.
Pattern analysis of offensive-odor substances in young salmon [Oncorhynchus masou] by gas chromatography and mass spectroscopy
1989
Taguchi, Y. (Nagano-ken. Research Inst. for Health and Pollution (Japan)) | Yamaura, Y. | Tsukioka, T. | Hayashi, H. | Seki, H. | Maki, S.
Survey of pesticide residues in vegetables and fruits for the past fifteen years
1989
Yoshida, F. (Nagano-ken. Research Inst. for Health and Pollution (Japan)) | Yamaura, Y.
Microbial interactions with chemical water pollution
1989
Tóth, D (Dezider) | Tomašovičová, Daniela
