Reducing effect of aerobic selector on the toxicity of synthetic organic compounds in activated sludge process
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Date
2009-12
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Elsevier
Abstract
The effects of phenol, 2-chlorophenol (2-CP), 2,4-dichlorophenol (2,4-DCP) and 1,2,4-trichlorobenzene (1,2,4-TCB) on the biodegradation kinetics of the conventional activated sludge system (CASS) and the selector activated sludge system (SASS) were investigated. Experiments were carried out using a respirometric method on unacclimated biomass from two lab-scale systems that were operated with the sludge age of 8 days. Toxicity of the test compounds for both reactors were arranged according to EC50 (effective concentration) values in order as: 1,2,4-TCB > 2,4-DCP > 2-CP > phenol. All selected test compounds induced higher inhibition effect in the CASS. The SASS appeared to reduce inhibition effect in comparison to the CASS, by 21.36%, 66.95%, 64.37% and 33.33% for phenol, 2-CP, 2,4-DCP and 1,2,4-TCB, respectively. Consequently, the SASS may be recommended as a promising configuration alternative for the waste streams containing toxic compounds.
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Keywords
Conventional activated sludge system, Inhibition, Respirometry, Selector activated sludge system, Synthetic organic chemicals, Waste-water, Filamentous bulking, Rcra compounds, Biodegradation, Kinetics, 4-chlorophenol, Chlorophenol, Chemicals, Bacteria, 2,4-DCP, Agriculture, Biotechnology & applied microbiology, Energy & fuels, Bioactivity, Biomass, Industrial chemicals, Organic chemicals, Organic compounds, Phenols, Toxicity, Activated sludge process, Activated sludge, Inhibition, Organic compound, Oxic conditions, Toxicity
Citation
Eleren, S. C. ve Alkan, U. (2009). "Reducing effect of aerobic selector on the toxicity of synthetic organic compounds in activated sludge process". Bioresource Technology, 100(23), 5714-5720.