| Title |
Evaluation of the Inhibitory Effect of Cu2+, Al3+ and Zn2+ on the Activated Sludge |
| Authors |
김창규 ( Chang Gyu Kim ) ; 김요용 ( Yo Yong Kim ) ; 박익범 ( Ik Beom Park ) ; 송진호 ( Jin Ho Song ) ; 남우경 ( Woo Kyong Nam ) ; 한송희 ( Song Hee Han ) ; 김복준 ( Bok Jun Kim ) ; 오조교 ( Jo Gyo Oh ) |
| DOI |
https://doi.org/10.15681/KSWE.2015.31.2.87 |
| Keywords |
activated sludge; Al; Cu; IC10; inhibitory effect; Zn |
| Abstract |
In this study, the inhibitory effect of toxic metals was investigated on the activated sludge of the municipal sewage treatment plant. The allowable concentration of toxic metals was also estimated for the stable operation of the biological treatment process. The single and mixture toxicity of Cu2+, Al3+ and Zn2+ were evaluated for the activated sludge microorganisms. As a result, nitrifying microorganisms were more susceptible than heterotrophic microorganisms. IC10 (Inhibition Concentration of 10%) of Cu2+, Al3+ and Zn2+ for the nitrifying microorganisms was 3 mg/L, 7 mg/L and 25 mg/L, respectively. The mixture toxicity showed three times more sensitive than the single toxicity. The concentrations of Cu2+, Al3+ and Zn2+ to minimize the inhibitory effect on organic matter removal and nitrification in batch experiments were found to be 1.3 mg/L, 2.5 mg/L and 6.3 mg/L. |