J. Technology and Education, Vol.16, No.1, pp.9-15, 2009

研究論文

光触媒装置と炭素繊維を用いた稚鼈養殖排水の処理

　

木幡　進^*1，工藤加奈¹，種村公平¹，井山裕文²，吉田修二³，下田誠³，服部守男⁴

　

¹八代工業高等専門学校生物工学科, ²機械電気工学科, ³技術室

（〒866-8501八代市平山新町2627）*kohata@as.yatsushiro-nct.ac.jp

⁴ (有)服部エスエスティー (〒867-0068水俣市浜松町5番98号)

　

Treatment of Drainage from the Cultivation of Soft-Shelled Turtles

Using Prototype Photo-catalytic Devices and Carbon Fiber

　

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)

　

　

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