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이선일 ( Sun-il Lee ),임상선 ( Sang-sun Lim ),딘비홍 ( Dinh-viet Hung ),이동석 ( Dong-suk Lee ),이광승 ( Kwang-sung Lee ),박래성 ( Re-sung Park ),박연주 ( Yeon-joo Park ),윤광식 ( Kwang-sik Yoon ),최우정 ( Woo-jung Choi ) 한국농공학회 2010 한국농공학회 학술대회초록집 Vol.2010 No.-
Floating plant system can remove phosphorus (P) from water via plant absorption of P. As fly ash (FA) is a good phosphorus (P) adsorbent, using FA as a medium for the floating plant system may enhance P removal. In this study, the effect of FA mixture on P removal was investigated through an experiment using box planted with rice (Oryza sativa L.). Sand mixed with 0 (code FA0), 25 (FA<sub>25</sub>), and 50% (FA<sub>50</sub>) of FA (w/w) was placed into the box (21 cm × 16 cm × 8 cm) and the box was floated on container (8 L) filled with P-contaminated water (3 mg P L<sup>-1</sup> as KH<sub>2</sub>PO<sub>4</sub>). Totally 24 mg of P was added into the container. On 7 days after treatment, chlorophyl-a concentration was 0.20 mg L<sup>-1</sup> for FA<sub>0</sub>, 0.05 mg L<sup>-1</sup> for FA<sub>25</sub>, and 0.04 mg L<sup>-1</sup> for FA<sub>50</sub>, indicating suppression of algae growth. On the same day, concentration of total P was 3.3, 2.7, and 2.3 mg P L<sup>-1</sup> for FA<sub>0</sub>, FA<sub>25</sub>, and FA<sub>50</sub>, respectively, suggesting that the suppression of algae growth by FA application is linked with decrease in P concentration. At the end of experiment (20 days after treatment), removal efficiency of P for FA<sub>0</sub> was as high as 84.8% and this was ascribed to rice uptake and P adsorption by sand. In FA treatment, the removal efficiency increased to 95.8% for FA<sub>25</sub> and 95.7% for FA<sub>50</sub>. Therefore, it was suggested that FA can be used as a plant growth medium in floating plant system for enhanced removal of water P.
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