The removal of various organic constituents in municipal sewage was investigated using anaerobic ... more The removal of various organic constituents in municipal sewage was investigated using anaerobic fluidized sludge blanket. (AFSB) and anaerobic filter (AF). Experimental results revealed that the AFSB reactor could treat the sewage more efficiently than the AF reactor and the removal efficiency of organic latter greatly varied in constituents. At hydraulic retention lines in the range of 8 to 24 hours, 50% COD reduction and 59% TOC reduction can be achieved by the AFSB reactor at 37°C. Lipids, proteins and carbohydrates can be highly removed, but the removal efficiency of surfactants is very low under anaerobic conditions. Methane production was rather limied (0.12 m3/kg COD removed at STP) and the COD reioval by sulfate reduction seems not to be neglected. The sludge production during 272 day operation times was 0.272 gVSS/g COD removed in the AFSB reactor.
The treatment characteristics of dilute milk wastes (1500 mg COD/l) were investigated by the two ... more The treatment characteristics of dilute milk wastes (1500 mg COD/l) were investigated by the two phase anaerobic digestion system consisting of a completely mixed reactor for acidogenesis and an upflow filter for methanogenesis. The system removed 92% of the influent COD at an overall hydraulic detention time of 4.4 days. Carbohydrates in the milk were most extensively decomposed (95%), next proteins (50%), while lipids were rapidly hydrolized to long-chain fatty acids but not degraded during the acid phase. The phase separation had an effect on reducing the toxicity of long-chain fatty acids to both acetogenic and methanogenic bacteria. The rates of sludge production were 0.257 mg VS/mg COD utilized during the acid phase and 0.043 mg VS/mg COD utilized during the methane phase. This low sludge production in the methane filter made possible long periods of operation without sludge wasting. The system proposed in this study could accept shock loads of a three-fold increase of the inf...
The Activated Sludge Model No. 2d (ASM2d) presents a model for biological phosphorus removal with... more The Activated Sludge Model No. 2d (ASM2d) presents a model for biological phosphorus removal with simultaneous nitrification-denitrification in activated sludge systems. ASM2d is based on ASM2 and is expanded to include the denitrifying activity of the phosphorus accumulating ...
Recently, PHAs(Polyhydroxyalkanoates) are focused on as biodegradable plastics. In this research,... more Recently, PHAs(Polyhydroxyalkanoates) are focused on as biodegradable plastics. In this research,the potential capabilities of PHA production in activated sludges treating real wastewater were surveyed. In this survey, conventional, anaerobic-aerobic and A2O activated sludges at 4 wastewater treatment plants in Tokyo were taken, and PHA production capability from acetate as carbon source in each activated sludge was investigated. Asresults, all activated sludges could accumulate PHA from acetate. This indicated that even conventional activated sludge can also accumulate PHA. The different capabilities of PHA production in activated sludges were different with dependent on the wastewater treatment plant, 20-30% PHA contents to MLSS were observed for 2 of 4 wastewater treatment plant. Throughout this survey, about 29.5% PHA contents was achieved at maximum. Key Words; PHA, biodegradable plastics, activated sludge treating real wastewater 1.は じめに PHA(Polyhydroxyalkanoate)は,微 生物 に とってエネ...
The Activated Sludge Model No.3 (ASM No.3) proposed by the IAWQ Task Group includes the process o... more The Activated Sludge Model No.3 (ASM No.3) proposed by the IAWQ Task Group includes the process of storage of organic substrates. But, it is not experimentally verified that the storage of organic substrates has principal significance in actual activated sludge processes. Moreover, the parameters for the storage of organic substrates in ASM No.3 are not selected on experimental bases. In this research, polyhydroxyalkanoate (PHA) is assumed as the principal storage product, and the capacity of storage of PHA in activated sludges obtained from seven full scale plants in Tokyo, including conventional activated sludge processes as well as those designed for nutrient removal, was examined. Sodium acetate was fed under either aerobic or anaerobic conditions to the activated sludges, and the behavior of internally stored PHA was measured. It was experimentally demonstrated that under the aerobic condition the storage process significantly affect the substrate uptake rate not only in activa...
Journal of the Environmental Engineering Division, 1981
... of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113, Japan) and Hideake Unno , (Master of Engrg., Pla... more ... of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113, Japan) and Hideake Unno , (Master of Engrg., Planning Div., Dept. of Water Supply and Environment, Ministry of Health and Welfare, Tokyo, Japan) Journal of the Environmental Engineering Division , Vol. 107 , No. ...
Biochemical mechanisms of anaerobic uptake of organic substrate by anaerobic-aerobic activated sl... more Biochemical mechanisms of anaerobic uptake of organic substrate by anaerobic-aerobic activated sludge were investigated experimentally. As the organic polymers stored in the cell, 3H2MB and 3H2MV were newly identified besides PHB and PHV. Conceptual pathways for the formation of PHA (polyhydroxyalkanoates) were postulated. It was suggested that the conversion of glycogen into PHA should be important for the mechanisms of biological excess phosphate removal.
The removal of various organic constituents in municipal sewage was investigated using anaerobic ... more The removal of various organic constituents in municipal sewage was investigated using anaerobic fluidized sludge blanket. (AFSB) and anaerobic filter (AF). Experimental results revealed that the AFSB reactor could treat the sewage more efficiently than the AF reactor and the removal efficiency of organic latter greatly varied in constituents. At hydraulic retention lines in the range of 8 to 24 hours, 50% COD reduction and 59% TOC reduction can be achieved by the AFSB reactor at 37°C. Lipids, proteins and carbohydrates can be highly removed, but the removal efficiency of surfactants is very low under anaerobic conditions. Methane production was rather limied (0.12 m3/kg COD removed at STP) and the COD reioval by sulfate reduction seems not to be neglected. The sludge production during 272 day operation times was 0.272 gVSS/g COD removed in the AFSB reactor.
The treatment characteristics of dilute milk wastes (1500 mg COD/l) were investigated by the two ... more The treatment characteristics of dilute milk wastes (1500 mg COD/l) were investigated by the two phase anaerobic digestion system consisting of a completely mixed reactor for acidogenesis and an upflow filter for methanogenesis. The system removed 92% of the influent COD at an overall hydraulic detention time of 4.4 days. Carbohydrates in the milk were most extensively decomposed (95%), next proteins (50%), while lipids were rapidly hydrolized to long-chain fatty acids but not degraded during the acid phase. The phase separation had an effect on reducing the toxicity of long-chain fatty acids to both acetogenic and methanogenic bacteria. The rates of sludge production were 0.257 mg VS/mg COD utilized during the acid phase and 0.043 mg VS/mg COD utilized during the methane phase. This low sludge production in the methane filter made possible long periods of operation without sludge wasting. The system proposed in this study could accept shock loads of a three-fold increase of the inf...
The Activated Sludge Model No. 2d (ASM2d) presents a model for biological phosphorus removal with... more The Activated Sludge Model No. 2d (ASM2d) presents a model for biological phosphorus removal with simultaneous nitrification-denitrification in activated sludge systems. ASM2d is based on ASM2 and is expanded to include the denitrifying activity of the phosphorus accumulating ...
Recently, PHAs(Polyhydroxyalkanoates) are focused on as biodegradable plastics. In this research,... more Recently, PHAs(Polyhydroxyalkanoates) are focused on as biodegradable plastics. In this research,the potential capabilities of PHA production in activated sludges treating real wastewater were surveyed. In this survey, conventional, anaerobic-aerobic and A2O activated sludges at 4 wastewater treatment plants in Tokyo were taken, and PHA production capability from acetate as carbon source in each activated sludge was investigated. Asresults, all activated sludges could accumulate PHA from acetate. This indicated that even conventional activated sludge can also accumulate PHA. The different capabilities of PHA production in activated sludges were different with dependent on the wastewater treatment plant, 20-30% PHA contents to MLSS were observed for 2 of 4 wastewater treatment plant. Throughout this survey, about 29.5% PHA contents was achieved at maximum. Key Words; PHA, biodegradable plastics, activated sludge treating real wastewater 1.は じめに PHA(Polyhydroxyalkanoate)は,微 生物 に とってエネ...
The Activated Sludge Model No.3 (ASM No.3) proposed by the IAWQ Task Group includes the process o... more The Activated Sludge Model No.3 (ASM No.3) proposed by the IAWQ Task Group includes the process of storage of organic substrates. But, it is not experimentally verified that the storage of organic substrates has principal significance in actual activated sludge processes. Moreover, the parameters for the storage of organic substrates in ASM No.3 are not selected on experimental bases. In this research, polyhydroxyalkanoate (PHA) is assumed as the principal storage product, and the capacity of storage of PHA in activated sludges obtained from seven full scale plants in Tokyo, including conventional activated sludge processes as well as those designed for nutrient removal, was examined. Sodium acetate was fed under either aerobic or anaerobic conditions to the activated sludges, and the behavior of internally stored PHA was measured. It was experimentally demonstrated that under the aerobic condition the storage process significantly affect the substrate uptake rate not only in activa...
Journal of the Environmental Engineering Division, 1981
... of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113, Japan) and Hideake Unno , (Master of Engrg., Pla... more ... of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113, Japan) and Hideake Unno , (Master of Engrg., Planning Div., Dept. of Water Supply and Environment, Ministry of Health and Welfare, Tokyo, Japan) Journal of the Environmental Engineering Division , Vol. 107 , No. ...
Biochemical mechanisms of anaerobic uptake of organic substrate by anaerobic-aerobic activated sl... more Biochemical mechanisms of anaerobic uptake of organic substrate by anaerobic-aerobic activated sludge were investigated experimentally. As the organic polymers stored in the cell, 3H2MB and 3H2MV were newly identified besides PHB and PHV. Conceptual pathways for the formation of PHA (polyhydroxyalkanoates) were postulated. It was suggested that the conversion of glycogen into PHA should be important for the mechanisms of biological excess phosphate removal.
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Papers by Tomonori Matsuo