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waste water treatment residence time

waste water treatment residence time

waste water treatment residence time

(OP)
In a waste water treatment coagulation tank, where TMT15 or the like is added to precipitate heavy metals like Hd, Cd and Pb,  what would be the mimimum allowable residence time?
I am not reffering to the decanter that follows but to the precipitation tank, before poly electrolyte is added

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