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Removal of Endocrine Disrupting Chemicals in Wastewater by Nitrifying Sludge  

Lim, Kyoung Jo (School of Chemical Engineering and Bioengineering, University of Ulsan)
Hong, Soon Ho (School of Chemical Engineering and Bioengineering, University of Ulsan)
Chung, Jin Suk (School of Chemical Engineering and Bioengineering, University of Ulsan)
Yoo, Ik-Keun (School of Chemical Engineering and Bioengineering, University of Ulsan)
Publication Information
Korean Chemical Engineering Research / v.47, no.6, 2009 , pp. 775-780 More about this Journal
Abstract
The efficacy of nitrifying sludge existed in biological nutrient removal process was examined for possible removal of endocrine disrupting chemical(EDC) in the effluent of wastewater treatment plant. Some of ammonia oxidizing bacteria causes ammonia oxidation mediated by ammonia monooxygenase(AMO) activity, which has low substrate specificity resulting in cometablic degradation of several chemicals. In this study, the removal of three model EDCs such as bisphenol A(BPA), nonylphenol(NP) and dibutyl phthalate(DBP) was studied in batch cultures using nitrifying sludge, BOD-oxidizing sludge with low nitrifying activity, and sterilized sludge. Nitrifying sludge showed higher initial removal rates in all batches of three EDCs when it was fed with ammonium as an energy source. The acclimation time was required for the removal of EDCs in batches using BOD-oxidizing sludge or nitritefed nitrifying sludge. That retardation seemed to attribute to the slow growth of cells using the EDCs while ammonium-fed nitrifying sludge could degrade EDCs through simultaneous cooxidation with ammonia oxidation. Sterilized sludge was also tested under the same conditions in order to find the contribution of physical adsorption to the removal of EDCs. About 10~20% of initial EDCs dose was removed when using sterilized sludge. Thus the biological activity is likely to play major role for the degradation of BPA, NP, and DBP rather than the physical adsorption from wastewater.
Keywords
Endocrine Disrupting Chemical; Nitrifying Sludge; Cooxidation; Wastewater;
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