Static thickening tests will be conducted on each distinct
sample. The effect of feed solids concentration, flocculant
dosage, underflow density and other controllable physical
parameters (within flowsheet constraints) will be examined.
Compression zone data, important in high rate thickener sizing,
is also gleaned from static tests.
Static thickening tests examine flocculation requirement,
- loading rate, unit area requirements, feed solids concentration
sensitivity, and to predict underflow solids concentration
for conventional thickeners.
Dynamic Thickening Testing
- Continuous tests will be conducted on each distinct sample
in a bench-scale dynamic thickener. Again, feed solids
concentration, flocculant dosage, system hydraulics and
so forth will be examined to define parameters important
for sizing and operating a high rate thickener.
- Continuous high rate thickening tests to examine feed
- stress) versus flocculant dosage and feed solids sensitivity
at known pH.
Static extension tests to predict underflow solids concentration
with time in the dynamic test unit at higher rake speeds,
as compared to results produced from standard conventional
thickening test methods with a lower rake speed.
High Density Thickening Testing
- For deep-bed, and/or paste thickening test work, feed
is pumped continuously into deep bed columns and underflow
density measurements are taken over an extended period
of time to determine the effect of bed depth on underflow