369. To purify natural water used in galvanic production, an electrolyte coagulator is introduced into it and the resulting sludge is settled in special settling tanks. Calculate the consumption of Al2(SO4)3 and NaCl (each separately), if the water consumption at the enterprise is 200,000 m3/day, and the coagulation thresholds are equal: for NaCl - 52 mol/m3, for Al2(SO4)3 - 0.23 mol /m3. Indicate the sign of the electrical charges of suspended particles in natural water.

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