Technical Specifications

DECHLORINATION TABLETS
GENERAL SPECIFICATIONS
Bio-Max dechlorination tablets shall be formulated to serve as a source of concentrated sodium sulte for the removal of chlorine
in water, wastewater and process water. The slow and consistent release of concentrated sodium sulte from Bio-Max tablets
shall allow their use in a variety of applications such as meeting National Pollution Discharge Elimination System (NPDES) criteria
and phase two storm water discharge requirements. The tablets shall be 2
5
/
8
" diameter, 1" in thickness with an approximate
weight of 140 grams. Proprietary beveled edges incorporated into the tablets will stabilize the slow release of sodium sulte.
Bio-Max dechlorination tablets shall contain a minimum of 92% sodium sulte as an active ingredient and 8% patent pending
inert ingredients. Ascorbic acid tablets or liquid sodium metabisulte systems require the mixing of irritating chemicals into a
pumpable slurry which exposes operators to potentially hazardous conditions and shall not be considered for this application.
TABLET PROPERTIES AND USAGE
Bio-Max dechlorination tablets shall release sodium sulte in direct correlation to the velocity of the incoming ow. This shall
allow design engineers and system operators to precisely regulate the sulte dose, and in turn, the dechlorination process
for maximum e󰀨ectiveness and minimum operating cost. Patent pending inert ingredients added to Bio-Max tablets shall
maintain this predictable chemical dose at intermittent peak ow factors as high as four and shall provide reliable elimination
of chlorine even when the signicant runo󰀨 period is six hours. Bio-Max tablets shall be an ideal product for municipal
storm water treatment which requires treatment capacity for high or pressurized ow and then an extended time of no ow
conditions. By incorporating commercial feeders such as Norweco’s Bio-Dynamic tablet feeders, or constructing custom units,
the consistent dosage of Bio-Max tablets will allow e󰀨ective and controlled dechlorination for a wide variety of applications.
PRODUCT APPLICATION
Bio-Max dechlorination tablets shall be incorporated into the treatment process following the chlorine contact tank or nal
tankage. As Bio-Max tablets stop the disinfection process by eliminating chlorine, no bacterial sampling shall be performed
on the e󰀪uent or water stream following the addition of Bio-Max tablets. The dechlorination system can be designed so the
entire ow needing dechlorination contacts the Bio-Max tablets or in a bypass arrangement where a percentage of ow is
directed at the tablets, is saturated with the sulte, and then blended into the remainder of the ow. While the cost e󰀨ective
performance of Bio-Max tablets is optimized with Norweco’s Bio-Dynamic tablet feeders in gravity ow applications, the
tablets can provide exceptional dechlorination with eld constructed feed systems or in conjunction with the various brands
of pressure type feeders. Check your feeder’s operating manual for further details.
DESIGN DATA
Tablet Size 2
5
/
8
" diameter, 1" thick Inert Ingredient Content 8%
Approximate Tablet Weight 5 oz. (140 grams) U.S. DOT Hazard Class Non-hazardous
Active Ingredient Sodium Sulte – Na
2
SO
3
Appearance Characteristics Blue-Green Tablet with Herbal
Odor
Active Ingredient Content 92% Special Design Features Beveled Edges
PRODUCT DOSAGE
Under gravity ow conditions, the sulte dose from Bio-Max tablets shall be 6.75 mg/L at 70° F. Signicant variations in
temperature or ow velocity may have an impact on tablet dose. Adjustment of dosing equipment will be required upon start-
up. Chlorine residuals prior to dechlorination uctuate based on upstream treatment processes and conditions. Monitoring
of chlorine residual levels prior to dechlorination is recommended to insure consistent performance of the dechlorination
system. Once steady performance of the upstream treatment process and dechlorination system is established only minor
adjustments of the feeder shall be required. A single feed tube of Bio-Max dechlorination tablets shall remove up to 3.8 mg/L
available chlorine, with no excess sodium sulte. To estimate average tablet usage, multiply plant ow in liters (l) per day by
6.75 mg/L, then divide this product by 1,000 and again by 140. The nal result will be the number of Bio-Max dechlorination
tablets used per day of operation. Consult your tablet feeder’s operational manual for further information.