Enzymatic digestibility of used newspaper treated with aqueous ammonia-hydrogen peroxide solution.
Wastepaper constitutes approximately half of municipal solid waste, making it a potential source of bioenergy. Newspaper was pretreated with an ammonia-hydrogen peroxide (H2O2) mixture in a shaking bath from room temperature to 80 degrees C, and then its enzymatic digestibility was measured. A significant amount of ink was removed from the newspaper slurry by the reciprocating movement of the shaking bath. In addition, the ammonia-H2O2 significantly swelled the substrate, thereby greatly increasing its susceptibility to enzymatic digestion. After pretreating the newspaper with conditions of 40 degrees C, 3 h, 130 strokes/min, and 4 wt% ammonia-2 wt% H2O2, the enzymatic digestibility was almost 90% of theoretical, or about 25% higher than that of untreated substrate. Digestibility was also investigated as a function of ammonia concentration, H2O2 concentration, shaking speed, pretreatment temperature, and time.
Kim
Sung Bae
SB
Division of Applied Chemical Engineering and ERI, Gyeongsang National University, Jinju 660-701 Korea. sb_kim@nongae.gsnu.ac.kr
Moon
Nam Kyu
NK
D000641:Ammonia; D018533:Biomass; D004798:Enzymes / Q000378:metabolism; D006861:Hydrogen Peroxide; D007700:Kinetics; D007723:Korea; D009524:Newspapers as Topic; D010209:Paper; D012037:Refuse Disposal / Q000379:methods*
D004798:Enzymes; D000641:Ammonia; D006861:Hydrogen Peroxide