Sludge chemical composition changes under uni-directional freezing
Journal
Water Science and Technology
Journal Volume
34
Journal Issue
3-4 -4 pt 2
Pages
525-531
Date Issued
1996
Author(s)
Abstract
The chemical compositions changes for waste activated sludge at different freezing speeds were analyzed via FTIR spectra. With a high speed of freezing, the chemical compositions are little influenced by the action of ice formation; while with a low speed of freezing, the chemical compositions are largely affected. The prerequisite for sufficient dewaterability improvement is found as the global floc migration owing to the ice front formation, which releases some ECPs (basically cellulose) from the sludge and alter the resulting cake structure ultimately.The chemical compositions changes for waste activated sludge at different freezing speeds were analyzed via FTIR spectra. With a high speed of freezing, the chemical compositions are little influenced by the action of ice formation; while with a low speed of freezing, the chemical compositions are largely affected. The prerequisite for sufficient dewaterability improvement is found as the global floc migration owing to the ice front formation, which releases some ECPs (basically cellulose) from the sludge and alter the resulting cake structure ultimately.
Subjects
Chemical compositions
Freeze/thaw
Freezing speed
FTIR
Unidirectional freezing
Type
journal article