Geoscience Reference
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Fig. 18.42 Selected axial images of the porous medium at several distances from the inlet, for an
experiment with 12 lm particles: a 0, b 120, and c 180 min. The column was oriented
horizontally, with the reference tube (white spot) positioned at the top. Reprinted with permission
from Amitay-Rosen et al. (
2005
). Copyright 2005 American Chemical Society
sludge and compost disposal on the land surface. Changes in the humic acid
fraction (HA) of soil following disposal of sludge were shown by Boyd et al.
(
1980
). These authors reported the association of proteinaceous and aliphatic
compounds originating from disposed sludge with natural soil humic substances.
Sludge-induced HA changes in the amended soil were confirmed by an increase in
amide and C-H stretch infrared absorptions, as well by increased N and decreased
C/H ratios. These results suggest that sludge-HA is incorporated into soil humic
acid, thus modifying its original composition.
