Force Main System Sulphide Control
with Hydrogen Peroxide
Force main systems are typically high
sulfide odor generators due to septicity conditions related to full pipe
flow and a greater anaerobic slime layer (biofilm) thickness. Primary
factors that influence sulfide loading generation in a force main
include sewage temperature, BOD, retention time, pipe size and flow.
Gaseous hydrogen sulfide (H2S) release at the force main discharge is
usually the main concern related to odor and corrosion control needs;
however, corrosion problems within the pipe can be of a concern (e.g.
"crown cutting") at locations where air pockets can lead to concentrated
H2S gas build up.
Some basic considerations for assessing an appropriate sulfide odor treatment method for force main systems include:
- Retention time / duration of control
- Pump station type / cycling (e.g. vfd; start/stop, etc).
- Force main injection tap points, if any (e.g. air relief valves)
- Existence of intermediate re-lift stations or in series pump stations
- Manifold force main systems
Sulfide Odor Treatment Methods
proven force main system sulphide control treatment methods exist that
can be evaluated depending on retention time and sulfide loadings. As a
general guide the following technology fit can be used:
If a force main tap can be located within approximately 30 minute
upstream of the discharge, H2O2 is a cost effective approach.
(2) PRI-SC requires intermediate dosing location for H2O2.
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