Reduction of Excess Sludge and Simultaneous Removal of Organic Carbon and Nitrogen by the Porous Carrier and Membrane Hybrid System
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概要
- 論文の詳細を見る
In a fluidized-bed porous carrier system, organic carbon and nitrogen in wastewater can be removed simultaneously. However, the excess sludge generated in the system has not been focused on. On the other hand, a membrane system can separate suspended solid from treated water and retain slowly growing microbes such as nitrifiers in the aeration tank. Porous carrier and membrane hybrid system with these respective advantages has been studied to enhance the nitrogen removal efficiency. In this study, the hybrid system was investigated to compare with a conventional carrier system in terms of the nitrogen removal rate from complex artificial wastewater (CAW) containing polypeptone as a nitrogen source. Moreover, the amounts of excess sludge generated in both systems were evaluated.Longer sludge retention time of the hybrid system was expected to enhance the microbial autolysis and lead to the reduction of the excess sludge. Consequently, the amount of excess sludge generated in the hybrid system was reduced to about one-fourth of that in the carrier system for about two months. In addition, a lot of slowly growing protozoa preyed on the microorganisms, which might have contributed to the reduction of excess sludge. The removal rates of organic carbon and nitrogen in the hybrid system were higher than in the carrier system, due to the highly concentrated microorganisms in the hybrid system. A batch operation revealed that the nitrogenous compounds of polypeptone in CAW were rapidly removed by assimilation, while urea in the artificial wastewater was mainly removed by nitrification. Consequently, total nitrogen concentration in CAW containing polypeptone decreased faster than in artificial wastewater containing urea. These results show that nitrogenous compounds in CAW are easy to be removed. The hybrid system is an efficient system to enhance the nitrogen removal and has a capability to reduce the excess sludge.
- 社団法人 化学工学会の論文
- 2003-10-01
著者
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海野 肇
工学院大
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丹治 保典
Graduate School Of Bioscience And Biotechnology Tokyo Institute Of Technology
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TANJI YASUNORI
Department of Bioengineering, Tokyo Institute of Technology
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UNNO HAJIME
Department of Bioengineering, Tokyo Institute of Technology
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MIYANAGA Kazuhiko
Graduate School of Bioscience and Biotechnology Tokyo Institute of Technology
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Miyanaga K
Department Of Bioengineering Graduate School Of Bioscience And Biotechnology Tokyo Institute Of Tech
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Miyanaga Kazuhiko
東京工業大学 生命工学科
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Miyanaga Kazuhiko
Department Of Chemistry And Biotechnology School Of Engineering The University Of Tokyo
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海野 肇
東京工業大学生命理工学部
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海野 肇
東京工大 生命理工
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Unno Hajime
Dep. Of Biotechnology Tokyo Inst. Of Technol. Yokohama 226-8501 Jpn
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Unno Hajime
Department Of Bioengineering Graduate School Of Bioscience And Biotechnology Tokyo Institute Of Tech
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Tanji Yasunori
Dep. Of Bioengineering Graduate School Of Bioscience And Biotechnology Tokyo Inst. Of Technol.
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Tanji Yasunori
Research Institute For Iron Steel And Other Metals Tohoku University
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FUNADA SHIGEYUKI
Department of Bioengineering, Graduate School of Bioscience and Biotechnology, Tokyo Institute of Te
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ICHI-NOHE RIEKO
Department of Bioengineering, Graduate School of Bioscience and Biotechnology, Tokyo Institute of Te
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Unno Hajime
Department Of Bioengineering Faculty Of Bioscience And Biotechnology Tokyo Institute Of Technology
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Tanji Yasunori
Department Of Bioengineering Faculty Of Bioscience And Biotechnology Tokyo Institute Of Technology
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Unno Hajime
Graduate School Of Bioscience And Biotechnology Tokyo Institute Of Technology:(present Office)depart
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Unno Hajime
Graduate School Of Bioscience And Biotechnology Tokyo Inst. Of Technol.
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Ichi-nohe Rieko
Department Of Bioengineering Graduate School Of Bioscience And Biotechnology Tokyo Institute Of Tech
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Funada Shigeyuki
Department Of Bioengineering Graduate School Of Bioscience And Biotechnology Tokyo Institute Of Tech
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Miyanaga Kazuhiko
Department Of Bioengineering Graduate School Of Bioscience And Biotechnology Tokyo Institute Of Tech
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