J. Technology and Education, Vol.16, No.1, pp.9-15, 2009
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Treatment of Drainage from the Cultivation of Soft-Shelled Turtles
Using Prototype Photo-catalytic Devices and Carbon Fiber
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Susumu KOHATA1, Kana KUDOH1, Kohei TANEMURA1,
Hirofumi IYAMA2, Syuji YOSHIDA3, Makoto SHIMODA3
1Department of Bioengineering, 2Department of Mechanical and Electrical Engineering, 3Technical Stuff Room,
Yatsushiro National College of Technology (Hirayama-shinmachi, Yatsushio, Kumamoto 866-8501, Japan)
Morio HATTORI4
Hattori SST Ltd. Co. (Hamamatsucho, Minamata, Kumamoto 867-0068, Japan)
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(Received April 15, 2009; Accepted May 8, 2009)
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Abstract
A TiO2 photo-catalyst drainage device was evaluated for its ability, in conjunction with carbon fiber injection, to purify waste fluid resulting from a soft-shelled turtle breeding system that utilizes hot spring water. When 34 L of cultured drainage was treated by one photo-catalyst device in a laboratory for 24 hours, the chemical oxygen demand (COD) was reduced by 1 ppm. Similarly, when 600 L was treated by two photo-catalyst devices in a processing tank of drainage for 115 hours, the COD was reduced by 0.5 ppm. In both drainage processes, it was confirmed that the photo-catalyst oxidized NH4+ into NO2| and then into NO3|. Upon carbon fiber injection, the flock was adsorbed by the fiber in a short time, and the total phosphorus and nitrogen concentrations declined. As a result, the water quality of the drainage processing tank was within the guidelines of both the national government and Kumamoto prefecture.

Keywords:
Soft-shelled turtle breeding, TiO2 , Photo-catalyst, Carbon fiber
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