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Removing residual chlorine from disinfected wastewater
- Dechlorination is the process of removing residual chlorine from disinfected wastewater prior to discharge into the environment.
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Dechlorination is the process of removing residual chlorine from disinfected wastewater prior to discharge into the environment. Sulfur dioxide is most commonly used for dechlorination and is the major focus of this fact sheet. Some dechlorination alternatives include carbon adsorption, sodium metabisulfite, sodium bisulfite, and hydrogen peroxide.
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Basic Dechlorination Procedure • The selected dechlorination process must be able to neutralize the chlorine to levels below 0.01 mg/l. • Testing needs to be done at the point of discharge, the point you lose control of the water flow. • Spread dechlorination chemical in the path of the discharge water to insure that the initial
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This is a high intensity method of chlorine removal that uses broad spectrum ultraviolet irradiation to dissociate free chlorine and chloramines, turning them into hydrochloric acid. The ultraviolet total organic (TOC) reduction process utilizes different nanometer wavelengths for specific compounds. For instance, free chlorine will normally be ...
Dechlorination is the process of removing the free and combined chlorine residuals to reduce residual toxicity after chlorination and before discharge. Sulfur dioxide, sodium bisulfite, and sodium metabisulfite are the commonly used dechlorinating chemicals. Activated carbon has also been used.
the by-products of the disinfection process may be carcinogenic. In spite of this, chlo-rine is expected to remain in wide use. Water disinfection, as now ordinarily considered, involves specialized treatment for the destruction of harmful, and otherwise objectionable, “nuisance” organisms.
In disinfection, the wastewater following secondary treatment is usually treated in one of two ways: (1) chlorination or (2) ultraviolet radiation. Chlorination involves the use of chlorine, either in the form of a gas (less common today), or as a liquid (sodium hypochlorite). The chlorine oxidizes the microorganisms.
