essential to marginal chlorination. The surplus,
which is used to control odors and tastes, is later
removed by dechlorination. This method is
particularly valuable in surface waters with
variable ammonia and organic content. Sulfur
dioxide reacts with chlorine to form acids that
are neutralized by the natural alkalinity of the
water. Sulfur dioxide is fed by equipment similar
to that used for chlorine feeding. Activated
carbon absorbs the excess chlorine, while
aeration removes it by dissipating it to the
Water Purification System (3000D)
The 3000D Water Purification System was
developed to provide a fully self-contained
water purification unit for purifying turbid
and bacteria-polluted water. The design of
the unit allows for increased efficiency,
mobility, and cost effectiveness. The unit
provides trouble-flee water purification at the
rate of 3,000 gph.
There are four modular components
located within a single frame: diesel-powered
pump, chlorinator control, filter, and supplies
to produce 20,000 gallons of potable water.
Subsequent water processing requires only
Diatamatious earth, chlorine, and diesel fuel.
Each module may be operated independently
in or out of the frame by one person.
Figure 9-18.Breakpoint chlorination curves.