ProMinent ProMix Series, Operating Instructions Manual, Page: 64 / 68

Pr o Minent ProMix
‘DB' & 'PB’ Polymer Feeder
ProMix Series MA Batch/Inline User Manual
64
Appendix C
– Polymer Sizing / Dosage
The ProMix M Polymer Pump switch on the controller door enables the user to select either LOCAL or
REMOTE
operation. In ‘LOCAL’, the polymer concentration setpoint is selectable from 0 - 1% for
emulsion polymer and 0
– 10% for Mannich by using the controller keypad. In ‘REMOTE’, the polymer
concentration is set proportionally by a remote 4-20 mA signal representing 0- 1% for emulsion polymer
and 10% for Mannich. It is assumed the pump stroke length is maintained at 100%.
The desired polymer dosage must be considered prior to selecting the ProMix M model and pump
speed. Typically the user will know how much polymer is required. This information is from jar tests or
from prior experience. Otherwise the dosage can be derived from an initial manual calculation which
must be adjusted based upon actual operation.
Below are typical guidelines to estimate polymer feed dosage:
1. For a Clarifier / Filter application:
A = MGD Plant Flow
B = ppm active polymer
C = desired solution concentration (%)
(A*B)/24 = GPH active polymer
GPH active polymer/C = Required dilution range
2. For a Sludge Dewatering application:
User must have the following information to estimate GPH neat polymer:
A = GPM sludge
B = % solids (concentration)
C = lbs polymer per dry ton
D = percent active polymer
E = desired solution concentration (%)
(((A*8.34)*B)*60)/2000 = Tons/Hr dry sludge
(((Tons/Hr dry sludge*C)/8.34)/D)/E = Required dilution range
The polymer concentration from the ProMix M Polymer feeder is based upon the neat polymer pump
rate divided by the total water flow through the primary and secondary flow-meters. For example, if the
neat polymer feed rate is 1.5 gph and the flow through the primary flow-meter is 15 gpm and the flow
through the secondary flow-meter is 10 gpm then the polymer concentration is:
((1.5 gph / 60) / (15 gpm + 10 gpm)) = 0.001 = 0.1%
Further post dilution is possible with equipment by others.