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Relationship between Toxicity of Heavy Metals and Sludge Retention Time in Sequencing Batch Reactor Process  

Kim, Keum-Yong (Department of Environmental Engineering, Chungbuk National University)
Cho, Young-Cheol (Department of Environmental Engineering, Chungbuk National University)
Lee, Sang-Ill (Department of Environmental Engineering, Chungbuk National University)
Publication Information
Journal of Korean Society of Environmental Engineers / v.29, no.3, 2007 , pp. 283-288 More about this Journal
Abstract
In order to elucidate the relationship between the sludge retention time(SRT) and the toxicity of heavy metals, such as copper (Cu), cadmium(Cd), and zinc(Zn), in sequencing batch reactor(SBR) process, IC50 was estimated with measuring of INT-dehydrogenase activity in variable SRTs. When the concentrations of heavy metals were increased, the activity of INT-dehydrogenase was gradually decreased indicating the heavy metals inhibit bacterial activity. Cu showed higher toxicity than Zn and Cd. $IC_{50}$ of Cu, Cd, and Zn ranged from $0.37\sim1.96$ mg/L, $15.4\sim16.9$ mg/L, and $9.70\sim23.4$ mg/L, respectively. The toxicity of Cu and Zn was reversely proportional to the length of SRT. It is probably caused by the increased concentration of extracellular polymeric substances in longer SRT which absorb heavy metals. Therefore, the operation of SBR with increased SRT is desirable in treatment of industrial wastewater containing heavy metals.
Keywords
Sequencing Bach Reactor; Sludge Retention Time; Heavy Metals; INT-dehydrogenase Activity; Extracellular Polymeric Substances;
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Times Cited By KSCI : 2  (Citation Analysis)
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