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KMID : 1024520210300110945
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Journal of the Environmental Sciences
2021 Volume.30 No. 11 p.945 ~ p.956
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Toxicity Evaluation of Single and Binary Mixture of Heavy Metals on the Growth and Phosphorus Removal Ability of Bacillus sp.
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Kim Deok-Won
Park Ji-Su
Oh Eun-Ji
Yoo Jin
Kim Deok-Hyeon
Chung Keun-Yook
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Abstract
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In this study, the effects of single and binary heavy metals toxicity on the growth and phosphorus removal ability of Bacillus sp.. known as be a phosphorus-removing microorganism, were quantitatively evaluated. Cd, Cu, Zn, Pb, Ni were used as heavy metals. As a result of analysis of variance of the half of inhibition concentration and half of effective concentration for each single heavy metal treatment group, the inhibitory effect on the growth of Bacillus sp. was Ni < Pb < Zn < Cu < Cd. And the inhibitory effect on phosphorus removal by Bacillus sp. was Ni < Pb < Zn < Cu < Cd. When analyzing the correlation between growth inhibition and phosphorus removal efficiency of a single heavy metal treatment group, a negative correlation was found (R2 = 0.815), and a positive correlation was found when the correlation between IC50 and EC50 was analyzed (R2 = 0.959). In all binary heavy metal treatment groups, the interaction was an antagonistic effect when evaluated using the additive toxicity index method. This paper is considered to be basic data on the toxic effects of heavy metals when phosphorus is removed using phosphorus removal microorganisms in wastewater.
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KEYWORD
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Toxicity assessment, Additive toxicity index, Phosphorus removal, Heavy metal, Bacillus sp.
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