• KSBB Journal
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• v.8 no.3
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• pp.237-242
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• 1993

Chitin-based fibers have low mechanical strength and hence cannot be used as surgery fiber due to fast degradation In tissues. A new fiber Chitulose was made by mixing chitin with cellulose, both of which have similar structure. A mixture of dimethylacetamide (DMAc) and 6% lithium chloride (LiCl) was found to be an effective solvent system for dissolvoing chitin and cellulose. The Chitulose fiber made by wet spinning of a mixture of chitin and cellulose resulted in the highest degree of strength and flexibility when the ratio of chitin to cellulose was 1.5; 0.2. The fiber maintained mechanical structure even after autoclaving, indicating thermal stability. A biodegradability test of the Chitulose fiber by imbeding in a rat showed that degradation was initiated in 14 days and completely done in 40 days.

• Journal of Korean Society on Water Environment
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• v.23 no.1
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• pp.27-32
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• 2007

This study focused on estimating the feasibility of a strong basic anion exchanger (PA312OH) as a sorbent for the removal of residual reactive dye and saving chemicals and water. Cellulose reactive dye C.I.RB49 was tested because reactive dye is the largest single group of dyes and that dye needs larger amount of inorganic salts as dyeing agent but nearly 50% of reactive dyes may be lost to the effluent. The adsorption characteristics of PA312OH for C.I.RB49 were as follows. Ion-selectivity among the dye and inorganic salts was Dye > ${SO_4}^{2-}$ > ${CO_3}^{2-}$ > $Cl^-$. C.I.RB49 was exchanged more than 3 times ${SO_4}^{2-}$ and ${CO_3}^{2-}$ and $Cl^-$ was not exchanged absolutely. The exchanging velocity was increased exponentially with increasing temperature. This result is positive effect on treating the high temperature dyeing process wastewater. The exchanged dye percents to initial were 96.8% and 99% at flow rate 20.5 mL/min. and 3.7 mL/min.. The exchanging capacity of PA312OH for C.I.RB49 was 215.2 mg/g at conc.=369.2 mg/L, Temp.=$25^{\circ}C$. 74% inorganic salts were recrystallized from real dark reactive color dyeing wastewater treated with PA312OH.

• Membrane Journal
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• v.13 no.2
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• pp.88-100
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• 2003

A change of filtrate flux in Taylor vortex flow filtration was investigated experimentally by rotating speed of inner cellulose ester membrane cylinder (average pore size: 1.2 ${\mu}m$), slurry concentration, and particle size. The filtrate flux was a direct proportion relation with TMP, but an inverse relation with resistances. A change of cake resistance with time was examined by rotating speed, slurry concentration, and particle size. Initial resistance increased dramatically as raising slurry concentration, and the pseudo-steady state was maintained at high resistance value. However, times to reach the pseudo-steady state did not depend on slurry concentration. The resistance was larger as smaller particle size, because possibility of pore blocking inside membrane could be higher and shear effect should be lower as smaller particle size. A model equation suggested in this study was composed of particle deposition and removal terms, and could confirm well experimental data using average values of experimental coefficients.

• Journal of Appropriate Technology
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• v.5 no.2
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• pp.91-96
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• 2019

Microalgae do not require much land and make a higher efficient oil production. However, it costs still much higher than other biodiesel resources, such as crops. Sugars charge 80% of culture media when microalgae are massively cultured in the fermenter. This study aims to develop a cost-efficient process for sugar production from Chinese cabbage byproducts. Pre-treatment with 0.25% H₂SO₄ was most effective when chopped cabbage was incubated 50℃/130 rpm for 24 hours. To hydrolyze cabbage cellulose, we used cellulases secreted from Trichoderma. harzianum. T. harzianum was cultured at 28℃/pH 7/130 rpm for five days. Optimal enzymatic activity of cellulase was obtained by incubating at 0.24 FPU/ml/45℃/pH 5/130 rpm for three days. In comparison to other agricultural waste, such as rice straw, green tea leaves, and palm residue, Chinese cabbage produced the highest sugar yield. We found the optimal conditions to produce sugar from Chinese cabbage byproducts as a carbon source to culture biodiesel-producing microalgae. The efficient process developed in this study helps microalgae as a sustainable alternative energy source by cost-down.