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Coagulation performance of PAC, Al2(SO4)3 and PIX in model wastewater was compared. For aluminium coagulants the proposed hypothesis that the amount of a coagulant has to be precisely determined based on the condition of the minimum of the parabola dx = 0 was confirmed. It was found that the dose of PIX should be calculated using the coordinates of the point of intersection of appropriate straight...
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