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1. A domestic water softener produces water with hardness of 5 mg/L as CaCO3. The raw water has hardness of 225 mg/L. Th
Posted: Thu Apr 28, 2022 3:22 pm
by answerhappygod
- 1 A Domestic Water Softener Produces Water With Hardness Of 5 Mg L As Caco3 The Raw Water Has Hardness Of 225 Mg L Th 1 (35.09 KiB) Viewed 20 times
1. A domestic water softener produces water with hardness of 5 mg/L as CaCO3. The raw water has hardness of 225 mg/L. The average finished water demand is 1600 gpd with hardness of 80 mg/L as CaCO3. Determine the flow through water softener. [3 marks) 2. The selected dilution for BODS test should be such that the residual DO is at least 1 mg/L, and DO depletion should be at least 2 mg/L. Assuming initial Do of 8.6 mg/L, calculate the range of BOD5 that can be measured by a dilution of 1 ml sample in a 300-ml BOD bottle. [4 marks]