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unit volume of the bed is 18 m /m , calculate the interval of regeneration.

16.12 Using a bed exchanger, 75 m of water per day is to be treated for hardness removal. The raw water contains 80 mg/L of Ca2+ and 15 mg/L

of Mg . The exchanger is a resin of exchange capacity of 1412.8 geq/m . Assume that the packed density of the resin is 720 kg/m . The total volume of the rinse and backwash requirement is 1.66 cubic meters and the interval of regeneration is 8 h. Calculate the backwash and rinse per unit volume of the bed.

16.13 Using a bed exchanger, 75 m of water per day is to be treated for hardness removal. The raw water contains 80 mg/L of Ca2+ and 15 mg/L of Mg2+. The exchanger is a resin of exchange capacity of 1412.8 geq/m . The total volume of the rinse and backwash requirement is 1.66 m , the interval of regeneration is 8 h, and the backwash and rinse per unit volume of the

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