2. Treatment steps
2.1 Pretreatment
Any pollution control treatment must include what is commonly referred to as "pre-treatment", which consists of a number of mechanical or physical operations designed to extract as many elements as possible, the nature and size of which would later constitute a nuisance. These operations are: screening, grit removal and oil removal.
Raw water passes through grates made up of bars placed vertically or at an angle of 60...
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Treatment steps
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