The role of floc density measurements in analyzing sludge dewatering characteristics
<p>Floc density measurements may play a significant role in analyzing sludge dewatering characteristics. A laboratory technique was developed to measure this property by means of isopycnic centrifugation. Four laboratory sludges were subjected to a series of dewatering tests: gravity thickenin...
| Main Author: | |
|---|---|
| Other Authors: | |
| Format: | Others |
| Published: |
Virginia Tech
2014
|
| Subjects: | |
| Online Access: | http://hdl.handle.net/10919/41559 http://scholar.lib.vt.edu/theses/available/etd-03122013-040136/ |
| Summary: | <p>Floc density measurements may play a significant
role in analyzing sludge dewatering characteristics. A
laboratory technique was developed to measure this property by means of isopycnic centrifugation. Four
laboratory sludges were subjected to a series of
dewatering tests: gravity thickening, centrifugation,
vacuum filtration, and highâ pressure dewatering. Each
sludge was analyzed for changing macro-and
microâ properties during increasing stages of dewatering.
It was concluded that sludge thickening rates are
influenced by aggregate volume fractions, sludge
density, suspension porosity, and the total surface area
occupied by sludge aggregates. The extent of mechanical
dewatering is impacted by similar parameters; namely,
floc volume fractions, sludge density, cake porosity, and the total surface area occupied by sludge floc.</p>
<p>
By interpreting the laboratory data, a model was
formulated to describe changes in water distribution
during the dewatering of sludges. This model includes a
speculative view of the qualification and quantification
of water-types.</p> === Master of Science |
|---|