• Title/Summary/Keyword: Immobilized polymer gel media

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Complex odor removal in pilot-scale biofilter with microorganisms immobilized on polymer gel media (미생물 포괄고정화 담체를 적용한 파일럿 스케일 바이오필터에서의 복합악취 제거)

  • Kim, Sun-Jin;Kim, Tae-Hyeong;Lee, Yun-Hee;Jang, Hyun-Sup;Song, Ji-Hyeon;Hwang, Sun-Jin
    • Journal of Korean Society of Water and Wastewater
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    • v.25 no.5
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    • pp.741-750
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    • 2011
  • A pilot-scale biofilter was constructed to discover degradation characteristics of the complex odor discharged from Ansan wastewater treatment plant. Candida tropicalis for volatile organic compounds, sulfur oxidizing bacteria(SOB) for hydrogen sulfide, and bacteria extracted from feces soil were immobilized on a polymer gel media. According to this study, the EBCT was varied from 36 sec to 18 sec. Toluene was removed as 80% along the variations, but it was recovered as 100% within 1 week. All benzene and xylene were removed during the operation while the efficiency of hydrogen sulfur was temporary decreased at 18 sec of EBCT, thereafter it was recovered to 100% within a week. The maximum elimination capacities of the benzene, toluene, xylene, and hydrogen sulfur were 6.6 g/$m^{3}$/hr, 31.7 g/$m^{3}$/hr, 7.8 g/$m^{3}$/hr, and 133.6 g/$m^{3}$/hr, respectively. There were merits on removal both organic and inorganic complex odor using the pilot-scale biofilter embedded with microorganisms immobilized on polymer gel media.

Removal of Volatile Organic Compounds using Candida tropicalis Immobilized on Polymer Gel Media in an Airlift Loop Bioreactor (Candida tropicalis 포괄고정 담체를 적용한 Airlift Loop Bioreactor에서의 복합 휘발성유기화합물 제거)

  • NamGung, Hyeong-Kyu;Ha, Jeong-Hyub;Hwang, Sun-Jin;Song, Ji-Hyeon
    • Journal of Korean Society of Environmental Engineers
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    • v.31 no.8
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    • pp.603-610
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    • 2009
  • This research was performed to improve removal efficiency of toluene and methyl ethyl ketone (MEK) using Candida tropicalis, one of the yeast species. An airlift loop bioreactor (ALB) was employed to enhance the capability of mass transfer for toluene and MEK from the gas phase to the liquid, microbial phase. Polymer gel media made from PAC, alginate and PEG was applied for the effective immobilization of the yeast strain on the polymer gel media. The experimental results indicated that the mass transfer coefficient of toluene without polymer gel media was 1.29 $min^{-1}$ at a gas retention time of 15 sec, whereas the KLa value for toluene was increased to 4.07 $min^{-1}$ by adding the media, confirming the enhanced mass transfer of volatile organic compounds between the gas and liquid phases. The removal efficiency of toluene and MEK by using yeast-immobilized polymer gel media in the ALB was greater than 80% at different pollutant loading rates (5, 10, 19 and 37 g/$m^3$/hr for toluene, 4.5, 8.9, 17.8 and 35.1 g/$m^3$/hr for MEK). In addition, an elimination capacity test conducted by changing inlet loading rates stepwise demonstrated that maximum elimination capacities for toluene and MEK were 70.4 and 56.4 g/$m^3$/hr, respectively.

Studies on the Immobilized Whole-cell Enzyme of Arthrobacter simplamide Polymer

  • Kim, Doo-Ha;Lee, J.S.;Ryu, D.Y.
    • Proceedings of the Korean Society for Applied Microbiology Conference
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    • 1978.10a
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    • pp.207.2-207
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    • 1978
  • Arthrobacter simplex (ATCC 6946) was cultured, induced and immobilized in acrylamide polymer. The characteristics of the immobilized whole-cell enayme were studied using hydrocortisone as the substrate. The enzyme activity was increased during the incubation of the gel particle in 0.5% peptone media. The ennzyme reaction kinetics of the Δ'-dehydrogenase (3-oxosteroid Δ'-oxydo reductase, E. C. 1.3.99.4) foliowed the Michaelis-Menten type. Km and Vm values were different significantly after immobilization of the cell. The optimum pH and temperature were changed, too. Nitrogen sources such as casitone, peptone or tryptone were good media for the enzyme reaction. And there was no need to add cofactors of the enzyme in the pre-sence of energy sources used in the test. The effect of metal ions on the enzyme activity was insignificant. Organic solvents were used increase the substrate concentration and there was no optimum solvent concentration depending on the substrate concentration.

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Refractory Textile Wastewater Treatment Using Cell-Immobilized Polyethylene glycol Media (PEG 포괄고정화담체를 이용한 난분해성 염색폐수 처리)

  • Han, Duk-Gyu;Cho, Young-Jin;Bae, Woo-Keun;Hwang, Byung-Ho;Lee, Yong-Woo
    • Journal of Korean Society of Environmental Engineers
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    • v.28 no.3
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    • pp.345-350
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    • 2006
  • This study investigated the removal of recalcitrant organics in dyeing wastewater using a fluidized bed reactor(FBR) that contained cell-immobilized pellets. The pellets were manufactured and condensing the gel phase by mixing PEG-polymer and cells to form micro-porous PEG-polymer pellets whose size were ${\Phi}\;4mm{\times}H\;4mm$ on average. An industrial activated sludge without any pre-adaptation was used for the cell immobilization because it gave an equivalent removal efficiency to a pre-adapted sludges. The feed was obtained from an effluent of a biological treatment plant, which contained $SCOD_{Cr}$ of 330 mg/L and $SBOD_5$ of 20 mg/L. The $SCOD_{Cr}$ removal efficiency was over 45% and the effluent $COD_{Mn}$ concentration was less than 100 mg/L at HRTs from 6 to 24 hrs. The optimum HRT in the FBR was determined as 12 hrs considering the removal efficiency and cost. When a raw wastewater containing 768 mg/L of $COD_{Cr}$ was fed to the FBR, the effluent $COD_{Cr}$ concentration increased only slightly, giving a 70% of $COD_{Cr}$ removal or a 97% of $BCOD_5$ removal. This indicated that the FBR had an excellent capability of biodegradable organics removal also. In conclusion, the FBR could be applied to textile wastewater treatment in place of an activated sludge process.