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http://dx.doi.org/10.5322/JES.2004.13.3.245

Inference of Sequencing Batch Reactor Process using Oxidation Reduction Potential  

Sim, Mun Yong (부산대학교 환경공학과)
Bu, Gyeong Min (부산대학교 환경공학과)
Im, Jeong Hun (부산대학교 환경기술산업개발 연구센터)
U, Hye Jin (부산대학교 환경공학과)
Kim, Chang Won (부산대학교 환경공학과)
Publication Information
Journal of Environmental Science International / v.13, no.3, 2004 , pp. 245-250 More about this Journal
Abstract
The SBR(Sequencing Batch Reactor) process is ideally suited to treat high loading wastewater due to its high dilution rate. SBR operates by a cycle of periods consisting of filling, reacting, settling, decanting and idling. The react phases such as aeration or non-aeration, organic oxidation, nitrification, denitrification and other bio-logical reactions can be achieved in a reactor. Although the whole reactions can be achieved in a SBR with time distributing, it is hard to manage the SBR as a normal condition without recognizing a present state. The present state can be observed with nutrient sensors such as ${NH_{4}}^{+}-N$, ${NO_{2}}^{-}-N$, ${NO_{3}}^{-}-N} and ${PO_{4}}^{ 3-}-P.$ However, there is still a disadvantage to use the nutrient sensors because of their high expense and inconvenience to manage. Therefore, it is very useful to use common on-line sensors such as DO, ORP and pH, which are less expensive and more convient. Moreover, the present states and unexpected changes of SBR might be predicted by using of them. This study was conducted to get basic materials for making an inference of SBR process from ORP(oxidation reduction potential) of synthetic wastewater. The profiles of ORP, DO, and pH were under normal nitrification and denitrification were obtained to compare abnormal condition. And also, nitrite and nitrate accumulation were investigated during reaction of SBR. The bending point on ORP profile was not entirely in the low COD/NOx ratio condition. In this case, NOx was not entirely removed, and minimum ORP value was presented over -300mV. Under suitable COD/NOx ratio which complete denitrification was achieved, ORP bending point was observed and minimum ORP value was under -300m V. Under high COD/NOx ratio, ORP bending point was not detected at the first subcycle because of the fast denitrification and minimum ORP value was under -300mV at the time.
Keywords
Sequencing batch reactor; Oxidation reduction potential; Bending point; COD/NOx ratio; On-line sensor;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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