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Chlorination Cost Comparison

The four methods of chlorination: gas, liquid, on-site generation, and granulated or tablet, have characteristics which should be considered when choosing a disinfection method. Suitability should be consistent with all the needs of the system. Although disinfection is the primary consideration; safety, handling, storage, rate of usage, availability of product and costs, are all factors which must be considered. Since no two systems are exactly alike, an objective analysis is necessary to insure the best possible method for any given facility.

  • Safety, handling, storage, availability
  • Chemical costs
  • Equipment costs

By addressing some of the characteristics of the four methods, it will be easier to assess the one that most suits your specific needs.

CHLORINE
CATEGORY
GAS
SODIUM HYPOCHLORITE
CALCIUM HYPOCHLORITE
MIOX ON-SITE GENERATION
Chlorine Content
100%
12.5%
60-70%
<1%
Container
150# Cylinder., Ton cont.
Tanks of various capacitys, drums
Std. capacity drums (steel, fiber, plastic)
Owner's day tank
Aging
None (100%)
Degrades with time and conditions
Degrades with time and conditions
None - generated as needed
Relative Cost
Unit cost (base)
3 - 5 time cost of gas
3 - 7 times cost of gas
Equivalent to gas
Reactivity
Oxidizer
Reactive with chemicals, heat, organics, releases Cl2
Reactive with chemicals, moisture, impact, heat, releases Cl2
Minimial - considered non-hazardous by EPA
Effect on pH
Lowers
Raises
Raises
None
Container Disposal
No
Yes (consider local codes & restrictions)
Yes (consider local codes & restrictions)
Empty salt bags to trash
Added Chemicals
No
Yes (sodium)
Yes (calcium)
No
Increases Volumes
No
Yes
Minimal
Minimal
Safety
Partial Cylinder - No change
Partial container - Cl2 release
Partial container - Cl2 release
Safest of all methods

The preceeding chart was developed as a guideline to help you determine the most efficient, cost effective means of chlorination for your particular treatment system.

AVAILABLE CHLORINE

  • Chlorine gas contains100% available chlorine.
  • Calcium hypochlorite (dry granular) contains 60-70% available chlorine.
  • Sodium hypochlorite (liquid) contains 12.5% available chlorine (average)
  • On site generation (MIOX) solution contains <1% hypochlorus acid.

Based on the chlorine content, it is necessary to feed different amounts of each to achieve the same disinfection level.

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