GO2TM is effective as both a disinfectant and an oxidant in wastewater treatment. GO2TM has several distinct chemical advantages compared to the traditional use of chlorine in wastewater treatment. GO2TM does not significantly hydrolyze in water, thus it retains biocidal activity over a broad pH range.
The required dosages will vary with water conditions and the degree of contamination present. For most municipal and other wastewater systems, a GO2TM residual concentration of up to 5 ppm is sufficient to provide adequate disinfection. For sulfide odor control, between pH 5-9, a minimum of 5.2 ppm of GO2TM should be applied to oxidize 1 ppm of sulfide (measured as sulfide ion). For phenol destruction, at pH less than 8 a dosage of 1.5 ppm GO2TM will oxidize 1ppm phenol; at pH greater than 10, a dosage of 3.3 ppm GO2TM will oxidize 1 ppm phenol.
GO2TM is non-reactive with ammonia and most nitrogen-containing compounds, and thus is effective at lower dose levels than chlorine. It destroys phenols, simple cyanides and sulfides by oxidation. For odor control, GO2TM will oxidize sulfides without the formation of colloidal sulfur. It is also used to oxidize iron and manganese compounds.
Method of dosing
By adding the two components of GO2TM to an appropriate volume of tap water the GO2TM 3% chlorine dioxide is produced. GO2TM should be applied to the processing system at a point, and in a manner which permits adequate mixing and uniform distribution. The feed point should be well below the water level to prevent volatilization of GO2TM. Avoid co-incident feeding of ClO2 with lime or powdered activated carbon.
Residual GO2TM chlorine dioxide concentrations must be determined by substantiated methods which are specific for chlorine dioxide. Two suitable methods are published in Standard Methods for the Examination of Water and Wastewater: 4500- ClO2 D DPD-Glycine Method 4500- ClO2 E Amperometric Method II.
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