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KMID : 0380020070220010043
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Korean Journal of Biotechnology and Bioengineering
2007 Volume.22 No. 1 p.43 ~ p.47
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Influence of Surfactant on the Hydrolysis of Used Newspaper
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Kim Sung-Bae
Kim Chang-Joon
Park Young-Chul
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Abstract
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The effect of surfactant on the hydrolysis of used newspaper was investigated. The most suitable surfactant for the pretreatment stage was found to be NP-series surfactants among 9 kinds of non ionic surfactants. Process parameters such as surfactant concentration, mixing speed, pretreatment temperature and time were tested to optimize for maximum digestibility and 0.5%, 100rpm, 30, and 1 h were found to be optimum, respectively. In order to maximize digestibility, substrate was pretreated with NP-20 and then the pretreated substrate was hydrolyzed by adding TW-80. The effect of surfactant on the hydrolysis of previously surfactant-pretreated newspaper was marginal. Therefore, the digestibility with the addition order of enzyme and surfactant was investigated by using surfactant only in hydrolysis stage. The results show that digestibility was more lowered as the surfactant addition after adding enzyme to substrate was more delayed.
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KEYWORD
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Newspaper, pretreatment, hydrolysis, surfactant, digestibility
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