Evaluating The Thermal Stability And Sorption
Capacity Of Several Compost Chars
Author(s)
L. Tsui, Y. C. Chao, M. A. Juang & Y. T. Chung
Abstract
The chemical composition of compost is much closer to coal when compared
with that of agricultural wastes. Since most activated carbon is currently
manufactured from coal, it might be easier to produce activated carbon from
compost than from other agricultural wastes. In this study, several compost
samples were compared for their thermal stability. In addition, sugarcane bagasse
samples with three maturities, i.e. 0-month, 1-month, and 6-month, were
pyrolyzed to produce carbon chars. The experimental results showed that the
thermal stability increased with compost maturity, and thus the highest carbon
char yield was obtained from the 6-month compost sample. The analysis of
chemical composition showed that the 6-month compost had the highest C/H and
C/O ratios, suggesting it has the greatest hydrophobicity among the three bagasse
samples. However, due to its high ash content, the 6-month compost char had
less sorption capacity for phenol when compared with other two bagasse chars.
Nevertheless, the 6-month compost char had comparable sorption capacity for
hydrophobic pollutant naphthalene. The results implied that there might be some
advantages of producing compost char as adsorbent for removing hydrophobic
pollutants from solution, although more work to enhance the carbon content in
the char may still be needed in order to manufacture high quality adsorbent from
compost.
Keywords: compost char, thermal stability, hydrophobicity, sorption, phenol,
naphthalene.
1 Introduction
Activated carbons (AC) are one of the most often used adsorbents for controlling
environmental pollutants, and they are generally produced from coal. However,
Keywords
compost char, thermal stability, hydrophobicity, sorption, phenol,
naphthalene.
Related Book
Other papers in this volume
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