17 DEC 2003
problem. The slow start alternative involves slowly opening of the filter outlet valve over
a period determined by the particular filter. Polymer conditioning uses a small amount of
polymer in the backwash water in the last few seconds of the backwash cycle. A condi-
tioning system requires polymer batching plant, pumps, and an automatic control sys-
tem. It may be advantageous to use slow-start in conjunction with polymer conditioning.
Hazardous waste disposal is a significant operations issue when handling
streams from HTRW sites. The attendant concerns include cost and time and care re-
quired for proper handling.
Figure 6-1. Relative Head Loss Within Granular Media Bed
SUPPORT FACILITY REQUIREMENTS. Based on the initial selection of
equipment, utility requirements for ventilation, power, water, air, telephone, and other
utilities can be determined. Although some of these calculations may be requirements
for the entire treatment facility, incremental calculations may be needed that apply spe-
cifically to equipment or facilities required for the filter operation. Generally, for the
package systems addressed, the manufacturer will supply required information.