primary treatment
Reading time:When necessary, primary treatment includes:
- bar-screening/straining in most industries;
- grit/grease removal from storm water or from IWW produced by metal and steel industries and some agri-food industries (see chapter pre-treatments);
- oil removal: oil and petrochemicals, energy generating plant, metal and steel mills;
- neutralisation;
- cooling (if necessary, for example in downstream treatments);
flocculators – settling tanks – flotation units
- remove suspended solids and colloids;
- precipitate and separate toxic or undesirable metals and salts;
- remove emulsified oils.