The characteristics of microbial ecosystem response with the changes of hydrolic retention time on an aerobic fixed-biofilm biological nutrient removal system |
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Authors: | Nam Hai-Uk Lee Tae-Ho Kim Young -O Park Seung-Han Park Tae-Joo |
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Affiliation: | (1) Dept. of Environmental Engineering, Pusan National University, 609-735 Busan, Korea;(2) Institute for Environmental Technology and Industry, Pusan National University, 609-735 Busan, Korea;(3) Safety and Environment Team, SK Corp., 680-130 Ulsan, Korea |
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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 tetra-zolium 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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Keywords: | Fixed Bed Biofilm pH NH4 +-N NO3 --N and DO Profile DAPI Activity |
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