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CAT3525_C04.qxd 1/27/2005 11:12 AM Page 91
Characterization of Solid Waste 91
CH OH
2 CH OH
2
O O
O OH O OH O

OH OH
n
FIGURE 4.10 Structure of cellulose.

OH O
CH 3 O CH 2 C CH 2 O

CH O [CH OH] O
2
HC HC CH 2 HOCH 2 OCH 3
HC HC CH CH O
H 2 C CH C O
O
CH 3 O CH 2 OH
O CH HOH C CH 3 O OCH 3
2
HC OH HC O O
HC OH
CH 2 OH
CH 3 O HOCH 2
O CH HC OCH 3 CH 2 OH
CH 2 O CH HC O CHOH
O HC HC O
HC OH
CH 3 O OCH 3 CH 2 OH
OH O CH
OCH 3
CH 3 O C CH O
OH

OCH 3
O
FIGURE 4.11 Structure of lignin. (Pearl, I.A., Chem. Eng. News, July 6, 1964, pp. 81–92. Reprinted with kind
permission from the American Chemical Society.)

FIGURE 4.12 Generic structure of a protein molecule.