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Thiobacillus ferrooxidans 의 Ferrous Iron 산화에 대한 계면활성제의 영향
류희욱,이태호,장용근,김상돈 ( Hee Wook Ryu,Tae Ho Lee,Yong Keun Chang,Sang Done Kim ) 한국화학공학회 1994 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.32 No.5
Influences of a number of surfactants on the oxidation of ferrous iron by Thiobacillus ferrooxidans were investigated. The goal was to select appropriate surfactants for a microbial coal desulfurization process. Anionic surfactants such as CWM 1001(polymer sulfonate Na salt), CWM 1002[formaldehyde condensate of sodium naphthalene sulfonate (n=4-5)], and CWM 1102[formaldehyde condensate of sodium naphthalene sulfonate(n=10-20)] strongly inhibited the oxidation of ferrous iron to ferric iron by T. ferrooxidans. Most of the surfactants tested slightly promoted the oxidation at low concentrations of 10-100 ppm, but significantly inhibited as increasing their concentrations. Other anionic surfactants such as CWM 1104(formaldehyde condensate of sodium naphthalene sulfonate, n=1) and CWM 1105(sodium polyacrylate), and a nonionic surfactant, TW 1020(polyoxyethylene sobitaneoleate), up to 1,000 ppm either had no effect on or slightly promoted the oxidation. The oxidation rate of ferrous iron was slightly reduced when a nonionic surfactant, Monopol NP1060(nonylphenol ethylene oxide adduct), was added over 500 ppm. These surfactants, CWM 1104, CWM 1105, TW 1020, and NP1060, were found to be used to improve the fluidity of coal slurry in a microbial coal desulfurization process with no harmful effects.
황산화 박테리아 Thiobacillus ferrooxidans 에 의한 석탄의 생물학적 탈황
류희욱,장용근,김상돈 ( Hee Wook Ryu,Yong Keun Chang,Sang Done Kim ) 한국화학공학회 1993 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.31 No.3
To remove pyritic sulfur from coal, chemoautotrophic, acidophilic, iron-oxidizing bacterium Thiobacillus ferrooxidans was employed. Coal samples used in all the experiments were an anthracite coal obtained from the Han Yang Mining Company. The effects of various process variables(such as coal pulp density, salt concentration, particle size and initial cell density) on the pyritic sulfur removal rate has been determined. About 80-98% of pyrite(FeS₂) in coal could be removed by T. ferrooxidans within 11-15 days in a shake flask. The maximum pyritic sulfur removal rate increases linearly between 10 and 50%(w/v) of the pulp density and reaches a maximum level at 70%(w/v) of pulp density(1,117 ㎎-S/L·day). The optimum operating conditions are found to be a pulp density of 70%(w/v). particle size less than 0.42 ㎜, and initial cell concentration of 10^9 cells/g-pyrite in coal.
류희욱,장용근,김상돈,조경숙,삼충양 ( Hee Wook Ryu,Yong Keun Chang,Sang Done Kim,Kyeoung Suk Cho,Tadahiro Mori ) 한국화학공학회 1994 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.32 No.2
To make a clay suitable for the production of ceramics, from a marine clay, a sulfur-oxidizing bacterium Thiobacillus ferrooxidans was used for the removal of pyrite(2.4 wt% FeS₂) from the marine clay. Influences of several process variables including microorganisms involved, slurry concentration, and medium composition were evaluated in terms of the rate of pyrite removal. Although the reaction rate was slow, a significant amount of pyrite in the clay could be also removed only by the inherent microorganisms in the clay without inoculation of T. ferrooxidans. A good fraction of the nutrients requirement was supplied from the clay itself. When a pyrite-adapted T. ferrooxidans was used, about 80-90% of the pyrite was removed in 7-12 days for slurry densities up to 70 w/v%. The relationship between the amount of oxidized pyrite per volume and pH could be expressed as pH=A-K log[FeS₂]. The rate of pyrite oxidation ranged from 506 to 1,714 ㎎-FeS₂/L-day depending upon slurry concentration. A process concept for continuous microbial desulfurization of clay was proposed in the present study.
연속생물반응기에서 perchlorate 환원 세균에 의한 perchlorate의 제거
류희욱(Hee-Wook Ryu) 한국생물공학회 2012 KSBB Journal Vol.27 No.1
In this study, the treatment ability of the wastewater containing perchlorate by non-salt tolerant perchlorate reducing bacterial consortium (N-PRBC) was evaluated in a continuous stirred tank bioreactor (CSTR). To obtain the optimal operating condition the bioreactor was operated with the different wastewater empty bed retention time (EBRT). The treatment performance in the bioreactor could be maintained at 100 mg-ClO₄- L<SUP>-1</SUP> up to a EBRT of 3 h, and the removal capacity in the CSTR was about 3.3 times higher than that in a batch operation. With a decrease from 9 h to 2 h in a EBRT, the volumetric perchlorate reduction rate was increased from 11.1 mg-ClO₄- L<SUP>-1</SUP> h<SUP>-1</SUP> to 50.0 mg-ClO₄- L<SUP>-1</SUP> h<SUP>-1</SUP>, and the specific perchlorate reduction rates were increased from 3.01 mg-ClO₄- g-DCW<SUP>-1</SUP> h<SUP>-1</SUP>. In conclusion, the treatment capacities in a CSTR were much better than those obtained in a batch operation.