What is chlorine dioxide

Chlorine dioxide is a disinfectant (oxidizer) that has a strong oxidizing power similar to chlorine and ozone.
It was also evaluated as an alternative chlorine in “ACT21”, which was undertaken by the Japan Water Resarch Center from 1997 to 2001, and was “water purification or water purification process” according to the “Ministry Ordinance that Establishes Technical Standards for Water Supply Facilities” in April 2000. It is an oxidizer approved as a “chemical to be injected into water”.

Characteristics of chlorine dioxide

Chlorine dioxide regulation

The regulations for chlorine dioxide in Japan (water supply industry) are as follows. (As of May 2020, jurisdiction: Ministry of Health, Labor　and Welfare)

• Water industry
  The injection rate of chlorine dioxide is 0.6 mg / L　or less,　and the chlorate ion derived from chlorine dioxide is 0.6 mg / L.
  (Ministry of Health, Labor　and Welfare: Water quality management target setting items　and target values ​​(27 items)) In addition, as water quality monitoring items, guideline values ​​of chlorine dioxide 0.6 mg / L　and chlorate ion 0.6 mg / L are set,　and chlorine dioxide is used. If so, daily inspection is mandatory.
• Food industry
  It is approved as a limited food additive as an oxidative bleach for cherries　and butterbur,　and as a flour bleach.
  (Designated additive: No. 285)
• Pool industry
  Chlorine dioxide concentration shall be 0.1 mg / L　or more　and 0.4 mg / L　or less. The chlorous acid concentration should be 1.2 mg / L　or less.

Use

• Bleach / Bactericide
  Pulp / fiber bleach
  Wastewater disinfectant
  Deodorant
• cooling water
  Slime removal of circulating cooling water
  Anti-biofouling agent for marine organisms when using seawater at power plants
  Algae　and mold remover for various facilities
• Beverage use
  Pre-　and intermediate chlorination at water purification plants (suppression of trihalomethane generation)
  Sterilization of river water　and groundwater
  Sterilization of soft drinks　and raw beer
• Water purification applications
  Fungicide at CIP (Cleaning In Place)
  Disinfectant in bottle cleaning　and filling equipment (filler)
  Floor cleaning water for food processing factory facilities (hygiene management)
  Dairy wash water

* Not limited to the above uses, there may be individual restrictions on use in Japan.