Table 15
Chemical-Specific Feeding Recommendations
Feeding Recommendations
Suitable
Chemical-to-
Handling
Accessory
Best
Water Ratio for
Types
Common Name/
Materials for
Equipment
Feeding
Continuous
of
Formula
Solutions2
Dissolving1
Required
Form
Feeders
Use
Solution
Dilute to
Full strength
ALUM: A12(SO4)3XH2O
Tank gauges or
Lead or
between 3% and
under controlled
Rotodip
scales
rubber-lined
Liquid
15% according
temp. or dilute
tanks,
Plunger pump
Transfer pumps
1 gal 36Be = 5.38 lb
to application
to avoid
Duriron,
of dry alum: 60F
Diaphragm pump
Storage tank
FRP3, Saran,
conditions,
crystallization
Coag. at pH 5.5 to 8.0
1700 pump
mixing, etc.
PVC-1, vinyl,
Temperature
Minimize surface
Sludge conditioner
Hypalon,
control
L-I-W
evap.: causes
Epoxy, 16 ss,
Precipitate PO4
flow problems
Eductors or
Carp. 20 ss,
dissolvers for
Keep dry alum
Tyril
dilution
below 50%
to avoid
crystallization
ALUMINUM SULFATE:
Ground,
0.5 lb/gal
Dissolver
Gravimetric
Lead, rubber,
FRP3, PVC-1,
A12(SO4)314H2O
granular, or
Belt L-I-W
Dissolver
Mechanical mixer
rice
316 ss, Carp.
(Alum, filter alum)
Volumetric
detention time
Scales for
20 ss, vinyl,
Helix
Powder is dusty,
5 min. for
Coagulation at pH 5.5
volumetric
Hypalon
to 8.0
arches, and is
ground (10 min.
Universal
feeders
Epoxy,
floodable4
for granules)
Dosage between 0.5 to
Solution
Ni-Resist
9 gpg
Plunger pump
glass,
Precipitate PO4
Diaphragm pump
ceramic,
polyethylene,
1700 pump
Tyril,
Uscolite
AMMONIA ANHYDROUS: NH3
Dry gas or as
----
Gas feeder
Scales
Steel,
aqueous soln.:
Ni-Resist,
(Ammonia)
see "Ammonia,
Monel,
Chlorine-ammonia
Aqua"
316 ss,
treatment
Penton,
Anaerobic digestion
Neoprene
Nutrient
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