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Degradation of Hazardous Chemicals by Biological Activated Carbon Treatment
Okada,Mitsumasa 嶺南大學校 環境問題硏究所 1993 環境硏究 Vol.12 No.2
Biodegradation of hazardous organic chemicals in organic wastewater by attached bacteria on biological activated carbon (BAC) with adsorbability were evaluated in comparison with fine particles of support medium (granulated slug (GS), bentonite(BEN)) and conventional activated sludge process (AS) to elucidate the role of activated carbon on the improvement of the performance of biological/physical removal of hazardous chemicals from wastewater. Activated carbon did not improve the performance under steady state operation. Better performance was noted in BAC system under shock loading, increase in the concentration of phenolic waste, of hazardous wastewater than in AS and GS systems. This seemed to be referable to the stimulation of bacterial activity to decompose phenol by activated carbon and to the remaining capacity of adsorption to decrease extracellular concentration of phenol. m-aminobenzoic acid added into the phenolic wastewater was decomposed only in the system added with powdered activated into activated sludge. Biodegradation was unstable both in AS and BEN systems. Although bacterial activity to degrade m-aminobenzoic acid was enhanced in the BAC system, remarkable increase in viable count on the medium with m-aminobenzoic acid as a sole carbon source was not noted. Also, species composition seemed to be identical among BAC, BEN and AS systems. It seemed likely that activated carbon, in addition to the capacity of adsorption, stimulated indigenous bacterial activity without enhancing species succession or population growth to show better performance for biodegradation.
Nishijima, Wataru,Okada, Mitsumasa,Shoto, Eiji 嶺南大學校 環境問題硏究所 1996 環境硏究 Vol.16 No.1
ABSTRACTThe purposes of this study are to clarify the behavior of phosphorus in coagulation/sedimentation process, and to evaluate the effects of phosphorus addition into biological activated carbon (BAC) treatment on the biodegradation of organic substances. Conventional coagulation/sedimentation reduced phosphorus concentration to very low level, that is, 0.002 - 0.004 mg P.I'1 in water containing less than 0.063 mg P.1"1. In continuous experiment, the biodegradation rate of glucose in the BAC with adsorbed phosphorus before the start of operation was 5 times higher than that in the BAC without adsorbed phosphorus. The rate of increase in bacterial population was higher in the BAC with adsorbed phosphorus compared to the BAC without adsorbed phosphorus. The biodegradation rate of glucose in the BAC without adsorbed phosphorus increased significantly by addition of phosphorus into influent. Therefore, growth and biodegradation activity of attached bacteria on BAC was limited by phosphorus of low concentration in influent treated by coagulation/sedimentation. Adsorption of phosphorus on activated carbon before the start of operation and/or addition of phosphorus in influent will be effective to improve the biological activity on BAC.
해수담수화에서 용존유기물을 제거하기 위한 전처리 공정의 평가
김우항 ( Woo Hang Kim ),( Okada Mitsumasa ) 한국물환경학회 2004 한국물환경학회지 Vol.20 No.5
The various pretreatment processes were evaluated to remove organic pollutants of weathered oil contaminated seawater(WOCS) for reverse osmosis desalination process. Biodegradation, coagulation, ultrafiltration, advanced oxidation processes and granular activated carbon filtration were used to evaluate the potential of organic pollutants removal in WOCS. Dissolved Organic Carbon(DOC) was almost not removed by biodegradation in WOCS. DOC` was removed by 25% and 10% with the addition of FeCl₃ and PAC in WOCS, respectively. The removal efficiency using ultrafiltration(WOCS 500) was about 20% of DOC and 40% of E_(260), respectively. In AOP application of WOCS, the removal of organic materials was improved up to 60% by the combination of UV/O₃ compared to UV process. However, 98% of DOC in WOCS could be removed by granular activated carbon filtration. It is revealed that activated carbon filtration is the best process for the pretratment of DOC removal.