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[compost_tea] More thiosulphate...



    
    
 Dechlorination Products - Sodium Thiosulfate   
 Product Description Product Assay. WT. % Specific Gravity 25ºC pH 5% 
solution 
30% solution 30.0 1.28 8.0 
Anhydrous 97.0 1.70 8.0 
Pentahydrate 99.2 1.70 8.0 
 
 Chemistry of Dechlorination Chemical Reaction Theoretical Use Ratio 
Sodium Thiosulfate (pH 11) Na2S2O3 + 4CI2 + 5H2O (to) 2NaHS04 + 8HCI 
0.556 
Sodium Thiosulfate (pH 6.5) Na2S2O3 + CI2 + H2O (to) Na2S04 + S + 
2HCI 2.225 
Sodium Bisulfite Na2HSO3+ CI2 + H2O (to) NaHS04 + 2 + 2HCI 1.455 
Sodium Sulfite Na2SO3+ CI2 + H2O (to) Na2S04 + 2 +2HCI 1.775 
Sulfur Dioxide SO3+ CI2 + 2H2O (to) H2S04 + 2HCI 0.903 
Hydrogen Peroxide H2O2+ CI2 (to) 2HCI + 02 (g) 0.488 
 
 Freeze Point Information

Solutions of all the dechlorination agents will freeze in cold 
temperatures. However, this problem can be minimized with careful 
planning. Options include:

Housing the chemical in an existing storage facility 
Storing the chemical in tanks designed for cold weather 
Burial of tanks and lines underground 
  
 Choice of Dechlorination Agent 
Although all the products listed are effective dechlorination agents, 
the correct choice depends upon the specific use location and the 
type of effluent being treated. JCI can advise you on the best 
dechlorination agent for your situation. We have in-depth experience 
in a broad range of end-use applications. We supply products and 
technical expertise to the chloralkali, pulp and paper, textile and 
municipal wastewater industries. The table below lists the advantages 
and disadvantages of the various dechlorination agents:
  
 Chemical Advantages Disadvantages 
Sodium
Thiosulfate Significant use history 
Non-toxic, non-corrosive, easy to use 
Low initial capital costs 
Easy to inject 
 Solutions subject to freezing in cold weather 
 
Sodium
Bisulfite Significant use history 
Easy to inject 
Low use ratio 
 Sodium bisulfite is corrosive 
Solutions subject to freezing in cold weather 
 
Sodium
Sulfite Significant use history 
Non-toxic, non-corrosive, easy to use 
 High use ratio 
Solutions subject to freezing in cold weather 
 
Sulfur
Dioxide Significant use history 
Inexpensive for large installations 
Injection equipment similar to that for chlorine gas can be used 
 Corrosive and hazardous to use 
Initial capital costs are high 
May increase hazard liability insurance 
Requires special storage and handling equipment 
Expensive for small installations 
 
Hydrogen
Peroxide Easy to inject 
 Does not remove chloramines at a useful rate 
Highly unstable and subject to deterioration  
 



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