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Received February 27, 2003
Accepted November 7, 2003
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The Characteristics of Microbial Ecosystem Response with the Changes of Hydrolic Retention Time on an Aerobic Fixed-Biofilm Biological Nutrient Removal System
Institute for Environmental Technology and Industry, Pusan National University, Busan 609-735, Korea 1Dept. of Environmental Engineering, Pusan National University, Busan 609-735, Korea 2Safety and Environment Team, SK Corp., Ulsan 680-130, Korea
Korean Journal of Chemical Engineering, May 2004, 21(3), 635-639(5), 10.1007/BF02705498
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Abstract
The influence of an aerobic fixed-biofilm activity, microbial ecosystem and mass transfer with respect to HRT variation in a BNR (biological nutrient removal) system has been investigated in this study. The process used in this study was an anoxic (1)/aerobic (1)/anoxic (2)/aerobic (2) system. The study was demonstrated by several kinds of techniques such as INT-dehydrogenase activity (DHA), INT (2-(p-iodophenyl)-3-(p-nitrophenyl)-5-phenyl tetrazolium chloride), DAPI (4',6'-diamidino-2-phenylindole hydrochloride), and microelectrode. The study used by synthetic wastewater and HRT variation demonstrated that the DHA activity, density and heterotrophs/autotrophs ratio increased, as the HRT decreased from 8 hr to 4 hr. In comparing two aerobic reactors in fixed-biofilm process, the first aerobic reactor of the higher C/N ratio showed higher heterotrophs/autotrophs ratio and microbial activity than the second aerobic reactor. It was therefore concluded that the heterotrophs/autotrophs ratio and microbial activity were a greater influence on the first aerobic reactor, as organic loading rate was increased by HRT variation.
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