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살수식 여과조의 질산화작용에 대한 수리학적 부하량과 C/N 비의 영향
최태건 ( Taegun Choi ),김병기 ( Pyong-kih Kim ),박정환 ( Jeonghwan Park ) 한국수산과학회(구 한국수산학회) 2019 한국수산과학회지 Vol.52 No.3
Styrofoam beads, which are relatively inexpensive and can provide a large specific surface area, were tested as filter media. Styrofoam beads with a diameter of 3±0.5 mm were used; the specific surface area of the beads was 1,034 ㎡·m<sup>-3</sup>. Five independent recirculating culture systems were used in the experiment. Each system consisted of one culture tank and three trickling bio-filters. Using the systems, nitrification efficiency was evaluated with respect to hydraulic loading rate (HLR) and carbon/nitrogen (C/N) ratio. The lowest ammonia and nitrogen concentrations were 0.84 mg·L<sup>-1</sup> and 1.30 mg·L<sup>-1</sup>, respectively, observed at an HLR of 50.9 ㎥·m<sup>-2</sup>·h<sup>-1</sup>. Nitrification efficiency in the culture tank was highest at a C/N ratio of 0, with ammonia and nitrite nitrogen concentrations of 0.32 mg·L<sup>-1</sup> and 0.90 mg·L<sup>-1</sup>, respectively. Ammonia and nitrite nitrogen concentrations in the culture tank abruptly changed at C/N ratios ≥ 3.
감성돔(Acanthopagrus schlegelii) 및 참돔(Pagrus major) 치어에 대한 이산화염소(ClO<sub>2</sub>)의 급성 독성
이옥 ( Ock Lee ),서준혁 ( Junhyuk Seo ),서형원 ( Hyoungwon Seo ),장다희 ( Dahee Jang ),이재만 ( Jaeman Lee ),최태건 ( Taegun Choi ),박정환 ( Jeonghwan Park ) 한국수산과학회(구 한국수산학회) 2020 한국수산과학회지 Vol.53 No.3
This study evaluated acute toxicity of chlorine dioxide (ClO<sub>2</sub>) to juveniles of black seabream Acanthopagrus schlegelii (19.4±2.3 g, 10.7±0.4 cm) and red seabream Pagrus major (74.9±8.2 g, 15.9±1.0 cm). Thirty juveniles for each species were exposed to target ClO<sub>2</sub> concentrations of 0, 0.05, 0.1, 0.125, 0.15, 0.2, 0.3, 0.4, and 0.5 mg/L in triplicate for eight days. Half lethal concentrations for 96 hours were found at 0.14 and 0.24 mg ClO<sub>2</sub>/L for black seabream and red seabream, respectively. Red seabream larger than black seabream in body weight appears to be more resistance to chlorine dioxide. However, regardless of species or size, specific loading rates of chlorine dioxide to total fish weight (daily feeding amount of ClO<sub>2</sub> /total fish weight) were similar, showing 1.3 and 1.1 g ClO<sub>2</sub>/kg fish·day<sup>-1</sup> for black seabream and red seabream.