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Energy requirements and process design considerations in compression‐milling pretreatment of cellulosic wastes for enzymatic hydrolysis
Author(s) -
Tassinari Thomas,
Macy Charles,
Spano Leo,
Ryu Dewey D. Y.
Publication year - 1980
Publication title -
biotechnology and bioengineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.136
H-Index - 189
eISSN - 1097-0290
pISSN - 0006-3592
DOI - 10.1002/bit.260220811
Subject(s) - cellulosic ethanol , enzymatic hydrolysis , cellulose , hydrolysis , sugar , reducing sugar , substrate (aquarium) , yield (engineering) , chemistry , materials science , pulp and paper industry , lignin , chemical engineering , waste management , organic chemistry , composite material , engineering , oceanography , geology
The effectiveness of compression‐milling pretreatment of lignocellulosics for enzymatic hydrolysis has been demonstrated for a wide variety of substrate sources. Reductions in the degree of crystallinity and the degree of polymerization of cellulose and partial destruction of the structural integrity of lignocellulosics brought about by compression milling significantly increase the susceptibility of cellulose to enzymatic hydrolysis. The enzymatic hydrolysis yield was found to be directly related to the specific energy input to the cellulosic substrate (kWh/1b substrate) by compression milling, and the energy input can be controlled by the milling time. The enzymatic hydrolysis yeilds from cellulosic materials pretreated by compression milling also vary significantly depending on the source and kind, the composition milling also vary significantly depending on the source and kind, the composition (contents of lignin and other components), and the structure. The power requirements for compression milling which renders equivalent hydrolysis yields also depend on the source and kind of lignocellulosics to be pretreated. For newspaper, the specific energy input required for 55% sugar yield is estimated as 0.3 kWh/lb substrate including 15% power loss. The additional sugar yield gained from the enzymatic hydrolysis of compression‐milled newspaper (over and above the sugar yield of untreated substrate) is determined as 453 g sugar/kWh energy input.