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Comparison of Bacterial Numbers and Treatment Efficiencies in Bioreactors of Various Advanced Wastewater Treatment Processes  

Sung, Gi Moon (Department of Microbiology, Graduate School, Daejeon University)
Cho, Yeon-Je (Global Water Institute Korea)
Kim, Sung Kyun (Department of Microbiology & Biotechnology, Daejeon University)
Park, Eun Won (Department of Microbiology & Biotechnology, Daejeon University)
Yu, Ki Hwan (Department of Bioscience and Biotechnology, Silla University)
Lee, Sang-Hyeon (Department of Bioscience and Biotechnology, Silla University)
Lee, Dong-Geun (Department of Bioscience and Biotechnology, Silla University)
Park, Seong Joo (Department of Microbiology, Graduate School, Daejeon University)
Publication Information
Journal of Korean Society on Water Environment / v.25, no.2, 2009 , pp. 329-334 More about this Journal
Abstract
Bacterial numbers, such as endospore-formers, and treatment efficiencies were investigated for Rotating Activated Bacillus Contactors (RABC) and other advanced wastewater treatment processes including anaerobic-anoxic-oxic (A2O), sequencing batch reactor (SBR) and biological aerated filter (BAF). Endospore-forming bacterial numbers in the RABC showed 129-fold higher levels than those of the existing advanced systems. RABC process demonstrated the highest bacterial numbers in its bioreactors (paired t-test, p<0.01). RBC biofilms and aeration tanks of the RABC system showed 131- and 476-fold higher than other existing advanced processes, respectively. Mean treatment efficiencies of the existing systems were 83.5% for chemical oxygen demand (COD), 59.1% for total nitrogen (TN) and 76.8% for total phosphorus (TP). However, RABC process removed 96.9% for COD, 96.9% for TN and 91.9% for TP for highly concentrated food wastewater (COD>1,500 mg/L, TN>150 mg/L, TP>50 mg/L). Treatment efficiency was significantly reduced when the numbers of Bacillus genus in the bioreactors decreased below $10^6CFU/mL$. The automated RABC (A-RABC), in which dissolved oxygen concentrations are automatically controlled, showed higher treatment efficiencies compared to the RABC process. The RABC system maintained sufficient bacterial numbers for the effective treatment of highly concentrated food wastewater. Moreover, final effluent was in agreement to water quality standards.
Keywords
Advanced wastewater treatment; Bacillus; Bacterial number; Rotating Activated Bacillus Contactor (RABC); Treatment efficiency;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
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