Equalizing of quantity and quality

The aim of selection of appropriate processes is to achieve the required water quality by employing a technically, economically and operationally simple technological line involving the minimum introduction of other substances into the treated water. 

During a treatment process pollutants of either organic or inorganic origin are to be removed, or both together. 

For removal of toxic inorganic substances precipitation, oxidation, reduction, ion exchange, adsorption and other procedures are used [32, 33]. 

If excessive amounts of dissolved inorganic substances are to be removed, electrodialysis, reverse osmosis, freezing out and ion exchange are the recommended procedures. 

In spite of the fact that quantity and quality equalizing is not a treatment process, the equalizing tanks frequently constitute an important part of the technological process. 

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