Biosorption of Lead and Cobalt by Absidia coerulea and Thraustochitrium sp.

Absidia coerulea와 Thraustochitrium Sp. 에 의한 납과 코발트의 생물흡착

Nonliving Absidia coerulea and Thraustochitrium sp. were used as biosorbents to remove lead and cobalt that are one of representative pollutant in wastewater and radioactive liquid waste. The optimum pH range for maximum lead and cobalt removal was increased 6.5~11.4 and 8.6~12.0 for Absidia coerulea and 4.2~10.5 and 8.9~11.6 for Thraustochitrium sp. to compared to biosorbent-free control, pH of 8.4~11.2 and 10.5~11.5, respectively. With 1 g biosorbent/L at initial solution pH 5.0. Absidia coerulea and Thraustochitrium sp. took up lead from aqueous solutions to the extent of 104 and 125 mg/g biomass, respectively, whereas Absidia coerulea and Thraustochitrium sp. at initial pH 6.0 took up only 2 and 20 mg/g biomass of cobalt, respectively. For initial 500 mg Pb/L at initial pH 5.0. optimum amount of biosorbent for maximum lead uptake was 0.2 g/L for Absidia coerulea and Thraustochitrium sp., whereas optimum 3.0 g biosorbent/L was needed for initial 200 mg Co/L at initial pH 6.0. Absidia coerulea and Thraustochitrium sp. had higher adsorption capacity for lead than that of cobalt.

중금속 폐수 및 방사성 폐액 속에 포함된 납과 코발트를 제거하기 위해 생물흡착제로 Absidia coerulea와 Thraustochitrium sp.를 사용하여 흡착실험을 진행하였다. 납과 코발트 제거의 최적 pH 영역은 blank의 경우 각각 8.4~11.2, 10.5~11.5, Absidia coerulea는 6.5~11.4, 8.6~12.0, 그리고 Thraustochitrium sp.는 4.2~10.5, 8.9~11.6이었다. 초기 pH 5.0에서 1 g/L의 생물흡착제를 투입했을 때 Absidia coerulea와 Thraustochitrium sp.는 104와 125 mg/g dry biomass의 납을 제거할 수 있었으며, 초기 pH 6.0에서 코발트는 단지 2와 20 mg Co/g dry biomass만을 제거할 수 있었다. 초기 500 mg Pb/L, pH 5.0에서 최적 생물흡착제 투입량은 Absidira coerulea와 Thraustochitrium sp.가 각각 0.2 g/L이었으며, 초기 200 mg Co/L, pH 6.0에서는 3.0 g/L이었다 . Absidia coerulea와 Thraustochitrium sp.는 납에 대해서 높은 흡착능을 보였으나 코발트에 대해서는 비교적 낮은 흡착능을 보였다.