Heat/ Polymer Treatment on Sludge Dewatering Characteristics
Date Issued
1999-07-31
Date
1999-07-31
Author(s)
DOI
882218E002033
Abstract
Sludges are concentrated residues
generated from wastewater treatment
process. Sludges in origin are organic
matters, biomass, and/or natural inorganic
particles. Without further treatment and
safe disposal, sludges will pose adverse
effects on environmental quality.
Therefore, sludge treatments including
volume/mass/water reduction, organic
stabilization, and disinfection are fairly
important parts of the total waste
abatement streams. In this study, the
dewatering of model biosludges from food
processing plant and coagulant sludges
from two water treatment plants with
meso-temperature conditioning was
investigated.
In addition to raise sludge temperature
to the range of 50 to 80 ℃, three different
conditioning polymers, cationic, anionic
and neutral, were used in conjunction with
the sludge-heating operations.
Parameters adapted for evaluating the
dewatering of sludges are capillary suction
time (CST), specific resistance of
filtration (SRF), sludge slurry viscosity,
and solids content of the centrifugally
dewatered sludges.
Among the three polymers, the
cationic polymer exhibits the best
improvement on sludge dewatering
characteristics in terms of CST and SRF.
There is a very close relationship between
CST and SRF for the three kinds of
sludges. As the sludge slurry is a non-
Newtonian fluid, the sludge viscositypresents a non-constant value. It is not
justified to correlate sludge viscosity to
CST or SRF. Therefore, sludge viscosity
is not a suitable parameter for evaluating
polymer efficiency.
The dewatering of sludge can be
significantly improved by the combined
effect of increasing sludge temperature
and using cationic polymer as conditioner.
The heating period is not a critical factor
on sludge dewatering process. The
viscosity of sludge slurry was modified on
applying conditioning polymer as well as
raising sludge temperature. Decreasing
sludge viscosity will enhance sludge
solid/water separation efficiency on
centrifugation.
Subjects
污泥脫水
增溫調理
黏滯度
毛係汲取時間
比組抗
Publisher
臺北市：國立臺灣大學環境工程學研究所
Type
report
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