Wastewater chlorination application example

Chlorine is also widely used in industrial applications. In water/wastewater treatment, for example, it is used in the disinfection unit process. Large quantities of chlorine gas (stored in one-ton cylinders or railroad tank cars) used in these treatment processes is a major concern of those tasked with ensuring plant security. 

Chloride ion is one of the major inorganic anions in water and wastewater because it is the more stable form of chlorine in solution. Chloride concentration is very variable and can be high and not only in seawater. It is used for domestic purpose but rather often for industrial processes. In some applications, the resulting concentration in wastewater can be important and greater than 1 g/L (food and chemical industry, for example). 

As clearly indicated by Dr. Kalvoda the application of electrochemical processes for the removal of pollutants is mainly concerned with the many sources of toxic heavy metals such as chemical manufactures, metal plating, surface treatment, mining and metallurgical operations. Electrodeposition, electroreduction to insoluble species and the use of sacrificial anodes are the techniques most widely used in this field. The production of chlorine from saline waters in urban or industrial wastewater treatments must also be quoted as a very interesting and practical example of an electrochemical application to the disinfection of different types of water. 

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