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UBC Theses and Dissertations
Deinking and kraft mill sludge dewatering using a laboratory sludge process Zhao, Hongmei
Abstract
A laboratory sludge press was used to investigate the dewatering of various wastewater treatment sludges generated in deinking mills and kraft pulp: mills. The effects of pressure applied to the sludge, pressing time and temperature were studied in terms of their effects on sludge cake solids consistency, filtrate flowrate and filtrate suspended solids (TSS). The effects of various combinations of primary and secondary sludge were tested. Secondary sludge alone could not be dewatered in the press. Addition of primary sludge made pressing possible and increasing the ratio of primary to secondary sludge improved performance. Sawdust and hog fuel were shown to be effective filter aids. The use of single polymer flocculants was compared to dual polymer coagulant/flocculant additions for various sludges. The use of a coagulant in a dual polymer system didn't improve dewatering compared to using a single polymer flocculant in term of cake solids consistency and filtrate flowrate although it did reduce the total amount of flocculant necessary. But a dual polymer system did reduce filtrate TSS. FeCl₃ and an inorganic polymer polyaluminum chloride (PAC) could be used to replace organic coagulants. FeCl₃ is cheaper than organic coagulants, but PAC is more expensive. Measurement of sludge particle charge was shown to be useful in detecting polymer overdosing. The laboratory sludge press was shown to be an effective tool for evaluating the use of polymeric conditioners in sludge dewatering. This press can distinguish the two mechanisms by which sludge dewatering occurs in practice, filtration and cake compression.
Item Metadata
| Title |
Deinking and kraft mill sludge dewatering using a laboratory sludge process
|
| Creator | |
| Publisher |
University of British Columbia
|
| Date Issued |
2001
|
| Description |
A laboratory sludge press was used to investigate the dewatering of various wastewater
treatment sludges generated in deinking mills and kraft pulp: mills. The effects of pressure
applied to the sludge, pressing time and temperature were studied in terms of their effects on
sludge cake solids consistency, filtrate flowrate and filtrate suspended solids (TSS). The effects
of various combinations of primary and secondary sludge were tested. Secondary sludge alone
could not be dewatered in the press. Addition of primary sludge made pressing possible and
increasing the ratio of primary to secondary sludge improved performance. Sawdust and hog fuel
were shown to be effective filter aids. The use of single polymer flocculants was compared to
dual polymer coagulant/flocculant additions for various sludges. The use of a coagulant in a dual
polymer system didn't improve dewatering compared to using a single polymer flocculant in
term of cake solids consistency and filtrate flowrate although it did reduce the total amount of
flocculant necessary. But a dual polymer system did reduce filtrate TSS. FeCl₃ and an inorganic
polymer polyaluminum chloride (PAC) could be used to replace organic coagulants. FeCl₃ is
cheaper than organic coagulants, but PAC is more expensive. Measurement of sludge particle
charge was shown to be useful in detecting polymer overdosing. The laboratory sludge press was
shown to be an effective tool for evaluating the use of polymeric conditioners in sludge
dewatering. This press can distinguish the two mechanisms by which sludge dewatering occurs
in practice, filtration and cake compression.
|
| Extent |
8903269 bytes
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| Genre | |
| Type | |
| File Format |
application/pdf
|
| Language |
eng
|
| Date Available |
2009-07-29
|
| Provider |
Vancouver : University of British Columbia Library
|
| Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
|
| DOI |
10.14288/1.0058973
|
| URI | |
| Degree | |
| Program | |
| Affiliation | |
| Degree Grantor |
University of British Columbia
|
| Graduation Date |
2001-05
|
| Campus | |
| Scholarly Level |
Graduate
|
| Aggregated Source Repository |
DSpace
|
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Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.