Need to separate sewer systems

Planning the treatment setup first of all entails the separation of sewer systems. In diis way each treatment can be adapted to each level of pollution. As a result, treatment can be made both more effective and less expensive to build and to run. 

A second point of concern is to promote water recycling (to the desalter, to the cooling system, etc.) by clear-cut separation ofi 

In addition to the salinity criterion, two other parameters influence separation S content and the nature of the emulsion. 

Sulfides have a certain inhibiting effect on biological purification, or can at least limit the development of some strains of bacteria and delay the breakdown of some BOD5 components (phenols, SCN ). 

By precipitation in the form of colloidal S or FeS, they can also make physicochemical purification flocculation more problematical and more sludge-producing. 

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