Sodium Chlorite

Sodium Chlorite Applications

Sodium chlorite (NaClO2) is specialty technology for short duration hydrogen sulfide control in collection system gravity and forcemain discharges, recycle streams, solids processing, septage and leachate. Sodium chlorite has been used for over 15 years in hydrogen sulfide control applications. Sodium chlorite oxidizes hydrogen sulfide and organic odors. No harmful by-products are formed from its reaction with sulfide. Sodium chlorite is very fast reacting (on the order of seconds) with hydrogen sulfide and organic odor compounds, making it a good choice for application in solids processing where retention times may be very short.

Sodium Chlorite Properties and Dosing

Sodium chlorite is supplied as a 25% solution in 55 gallon drums or 300 gallons totes, and in bulk quantities of 4,000 gallon tank trucks.

Sodium chlorite oxidizes hydrogen sulfide according to the following equation:

Neutral-Acid pH:

2 H2S + NaClO2 2 S + HCl + NaOH + H2O

Alkaline pH:

S2- + 2 NaClO2 SO42- + 2 NaCl

Theoretical dose ratios of NaClO2 are dependent on the pH of the solution being treated. Under neutral-acid pH, the theoretical dose ratio is 1.4 lbs NaClO2:lb H2S with practical dose rates anywhere from 1.6 to 4 depending on the application. Under alkaline pH conditions, the theoretical dose ratio is 5.6 lbs NaClO2:lb H2S with practical dose rates anywhere from 6 to 12 depending on the application.

Sodium Chlorite Costs and Sources

Typical pricing for sodium chlorite solution is $0.50 per pound 25%. The cost per pound of sulfide treated is anywhere from $3.20 to $8.00 under neutral-acid pH and $12.00 to $24.00 under alkaline pH conditions.

Sodium Chlorite Drawbacks

Some drawbacks of sodium chlorite use are as follows:

  • Moderate to high cost
  • Oxidizer classification may restrict feed sites
  • High doses are needed to suppress downstream odor generation
  • Potential exists for biotreatment inhibition from overdosing

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