Korean Journal of Environmental Agriculture (한국환경농학회지)

The Korean Society of Environmental Agriculture (한국환경농학회)
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Inhibitory Effect of the Selected Heavy Metals on the Growth of the Phosphorus Accumulating Microorganism, Acinetobacter sp.

  • Chung, Keun-Yook (Department of Agricultural Chemistry, Chungbuk National University) ;
  • Han, Seok-Soon (Department of Agricultural Chemistry, Chungbuk National University) ;
  • Kim, Hong-Ki (Department of Agricultural Chemistry, Chungbuk National University) ;
  • Choi, Guak-Soon (Department of Agricultural Chemistry, Chungbuk National University) ;
  • Kim, In-Su (Department of Agricultural Chemistry, Chungbuk National University) ;
  • Lee, Sang-Sung (Department of Agricultural Chemistry, Chungbuk National University) ;
  • Woo, Sun-Hee (Department of Crop Science, Chungbuk National University) ;
  • Lee, Kyung-Ho (Department of Environmental Planning, Gyeongju University) ;
  • Kim, Jai-Joung (Department of Agricultural Chemistry, Chungbuk National University)
  • Published : 2006.03.31
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Abstract

This study was initiated to evaluate the inhibitory effect of selected heavy metals on the growth of Acinetobacter sp. Down as one of the phosphorus accumulating microorganisms (PAO) involved in the enhanced biological phosphorus removal (EBPR) process of the wastewater treatment plant. Acinetobacter sp. was initially selected as a starting model microorganism and was grown under aerobic condition for this experiment. The heavy metals selected and investigated in this study were cadmium (Cd), copper (Cu), mercury (Hg), nickel (Ni), and zinc (Zn). Median $(IC_{50})$ and threshold $(IC_{10})$ inhibitory concentrations for Cd, Cu, Hg, Ni, and Zn were 2.95 and 1.45, 4.92 and 2.53, 0.03 and 0.02, 1.12 and 0.43, 14.84 and 5.46 mg $L^{-1}$, respectively. We demonstrated that most of heavy metals tested in the experiment inhibited the growth of Acinetobacter sp. in the range of predetermined concentrations. Based on the data obtained from the experiment, Hg was the most sensitive to Acinetobacter sp., then Ni, Cd, Cu, and Zn in order.

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