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김봉섭(Bong Sub Kim),서명교(Myung Gyo Suh),박광식(Kwang Sik Park),서재신(Zae Sin Seo),허종화(Jong Wha Hur) 한국환경보건학회 1999 한국환경보건학회지 Vol.25 No.4
This study was carried to investigate the milk-wastewater treatment in batch and continuous fluidized-bed bioreactor containing active microorganism, Aspergillus niger KCTC 1231. The reactor was operated at 30℃. The COD removal efficiency and MLSS were measured to determine the performance of the fluidized-bed bioreactor by cell concentration, aeration rate, and organic loading rate, respectively. At conditions of 60 ㎖ cell concentration and 2.0LPM aeration rate, milk-wastewater showed the COD removal efficiency of 81.51% and MLSS of 43,562 mg/ℓ, Also the same conditions, at adding 80 ㎖ chitosan beads, the COD removal efficiency and MLSS were about 85.79% and 62,482.5 mg/ℓ, respectively. In case of organic loading rate 3.88 kgCOD/㎥·day, free cell and adding chitosan beads showed about 80∼85% and 85∼90% COD removal efficiency, respectively. It was showed that milk-wastewater treatment of fluidized-bed bioreactor with chitosan beads was about 5% more efficient.
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남부지역 시설원예산물의 가공품개발 연구 : 오이지의 품질변화에 미치는 키토산의 효과
김봉섭(Bong Sub Kim),박광식(Kwang Sik Park),서명교(Myung Gyo Suh),서재신(Zae Sin Seo),허종화(Jong Wha Hur) 한국환경보건학회 2000 한국환경보건학회지 Vol.26 No.1
This study was investigated the characteristics of chitosans(red crab, fungal) prepared from red crab shell and Absidia coerulea IFO 5301 and the effects of chitosans on the quality of cucumber pickles during fermentation. The molecular weight of red crab and fungal chitosan were 6.5 × 10⁵ and 2.75×10⁵ Daltons, respectively. The degree of deacetylation, 76% and 88%, respectively. From the I.R. spectra, the absorption bands at 1655 cm⁻¹(arnide I), 1550 cm⁻¹(arnide II) of red crab and reference chitosan became very weak, similarly. And at solid state ¹³C-NMR spectra, C=O(carbonyl carbon) signals were absent, whereas CH₃(methyl carbon) signals were residues. Chemical shift of ¹³C-NMR spectra of red crab, fungal and reference chitosans were in good agreement with slight experimental deviation. The cucumber pickles were fermented at 25°C for 7days in 10% brine. The rate of change in pH and total acidity of cucumber pickle liquids with 10% brine(control) was rapidly while with 20 mg chitosan was slowly. The turbidity of cucumber pickle liquid with 20 mg chitosan was lower than that of the control. These results showed applicability of greenhouse cucumber as a cucumber pickle and qualities of cucumber pickles by added chitosans were improved.
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