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2018 Vol.50, Issue 2 Preview Page
Study of Buffer Substitution Using Inhibitory Compound CaCO3 in Enzymatic Hydrolysis of Paper Mill Waste Fines
Byeongcheol Min
,
Surya N. Jampana1
,
Christoper M. Thomas1
,
Bandaru V. Ramarao1†
Department of Wood and Paper Science, Chungbuk National University, Cheongju, 28644
1Department of Paper and Bioprocess Engineering, Empire State Paper Research Institute, State University of New York - College of Environmental Science and Forestry, Syracuse, NY 13210
†Corresponding author: E-Mail: bvramara@esf.edu
30 April 2018. pp. 77-82
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Abstract

Buffer substitution method were studied to improve the efficiency and to reduce cost of enzymatic hydrolysis of paper mill waste fines. The method is utilization of CaCO3 in waste fine as a buffer material to substitute traditional buffer chemicals using in hydrolysis process. The 0.05M of sodium acetate buffer required 8.2 kg of sodium acetate and 2.0 kg of acetic acid per 100 kg of waste fines to make the pH 5. When buffer solution and waste fines were mixed, the pH of the mixture shifted to 6.5-7.0 due to the dissociation of CaCO3. The shifted pH was adjusted with addition of extra acids such as sulfuric acid and acetic acid to reach the pH to 5.2. Adjustment of pH increased waste fine hydrolysis yield from 33.7% to 41.4% by addition of extra acetic acid as much as 6.3 kg per 100 kg of waste fines. For the buffer substitution method, only 7.7 kg of acetic acid was demanded without sodium acetate for the same pH level (pH 5.2) of the mixture. The buffer substitution method resulted in 40.8% of hydrolysis yield which was comparable result of pH adjustment of buffer. The buffer substitution method reduced the requirement of 8.2 kg of sodium acetate and 0.6 kg of acetic acid for 100 kg of waste fine hydrolysis. Addition of sulfuric acid resulted adverse effects compared to addition of acetic acid for both pH adjustment and buffer substitution.

Keywords
Enzymatic hydrolysis, paper mill waste
CaCO3
buffer substitution
pH adjustment
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Information
  • Publisher :Korea Technical Association of The Pulp and Paper Industry
  • Publisher(Ko) :한국펄프종이공학회
  • Journal Title :Journal of Korea TAPPI
  • Journal Title(Ko) :펄프종이기술
  • Volume : 50
  • No :2
  • Pages :77-82
  • Received Date : 2018-04-10
  • Revised Date : 2018-04-29
  • Accepted Date : 2018-04-30
  • DOI :https://doi.org/10.7584/JKTAPPI.2018.04.50.2.77
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