Table 15 (Continued)
Chemical-Specific Feeding Recommendations
Feeding Recommendations
Chemical-to-
Suitable
Common Name/
Best
Water Ratio for
Types
Accessory
Handling
Formula
Feeding
Continuous
of
Equipment
Materials for
1
Solutions2
Use
Form
Dissolving
Feeders
Required
Gravimetric
Iron, steel,
Rotolock for
Dense
Dry feed
SODIUM CARBONATE:
0.25 lb/gal for L-I-W
rubber,
light forms to
Na2CO3
Volumetric
Hypalon,
prevent flooding
10 min.
(Soda ash: 58% Na2O)
detention time, Helix
Tyril
Large dissolvers
Water softening
Solution
Bin agitators for
0.5 lb/gal for
pH adjustment
Diaphragm pump
medium or light
20 min.
Bal. diaphragm
grades and very
Soln. feed
pump
light grades
1.0 lb/gal
Rotodip
Warm H2O and/or
Plunger pump
efficient mixing
can reduce
detention time
if mat. has not
sat around too
long and formed
lumps--to 5 min.
SODIUM CHLORITE: NaClO2
Soln. as
Batch solns.
Solution
Chlorine feeder
Penton, glass,
Diaphragm
(Technical sodium
and chlorine
Saran, PVC-1,
received
0.12 to
Rotodip
chlorite)
dioxide generator
vinyl, Tygon,
2 lb/gal
FRP3,
Disinfection, taste,
and odor control
Hastelloy C
Ind. waste treatment
(fair),
(with Cl2 produces ClO2)
Hypalon, Tyril
SODIUM HYDROXIDE: NaOH
Solution feed
NaOH has a high
Solution
Goggles
Plunger pump
(Caustic soda,
heat of soln.
Rubber gloves
steel
Diaphragm pump
soda lye)
Aprons
For no
Bal. diaphragm
pH adjustment,
contam., use
pump
Penton,
Rotodip
rubber,
PVC-1,
316 st.,
Hypalon
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