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A city supply of 15000 cubic meters of water per day is treated with a chlorine dosage of 0.5 ppm. For this purpose, the requirement of 25% bleaching powder per day would be:
- a)300 kg
- b)75 kg
- c)30 kg
- d)750 kg
Correct answer is option 'C'. Can you explain this answer?
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Verified Answer
A city supply of 15000 cubic meters of water per day is treated with a...
Chlorine required for the city = Dose × Discharge
∴ Bleaching powder required 
Most Upvoted Answer
A city supply of 15000 cubic meters of water per day is treated with a...
Given:
City supply of water per day = 15000 cubic meters
Chlorine dosage = 0.5 ppm
To find:
Requirement of 25% bleaching powder per day
Solution:
1. Calculation of chlorine required
Chlorine dosage = 0.5 ppm
1 ppm = 1 mg/L
1 mg/L = 1 mg/1000 mL
1 mg/L = 1 mg/cubic meter
Chlorine required = 0.5 mg/cubic meter
Total chlorine required = Chlorine required x city supply of water per day
Total chlorine required = 0.5 mg/cubic meter x 15000 cubic meters
Total chlorine required = 7500 mg = 7.5 g
2. Calculation of bleaching powder required
Bleaching powder is used to provide chlorine to the water
Bleaching powder contains 25% chlorine by weight
Let the weight of bleaching powder required be x kg
Chlorine provided by x kg of bleaching powder = 25% of x kg
Chlorine provided by x kg of bleaching powder = (25/100) x x kg
Chlorine provided by x kg of bleaching powder = 0.25 x kg
Chlorine provided by x kg of bleaching powder = 250 x g
As 1 g of bleaching powder contains 0.25 g of chlorine
Therefore, x kg of bleaching powder contains = (250/0.25) g of bleaching powder
x kg of bleaching powder contains = 1000 g = 1 kg of bleaching powder
3. Calculation of bleaching powder required per day
From step 2, we know that 1 kg of bleaching powder provides 250 g of chlorine
Total chlorine required per day = 7.5 g
Total bleaching powder required per day = (7.5 g / 250 g) x 1 kg
Total bleaching powder required per day = 0.03 kg = 30 kg
Therefore, the requirement of 25% bleaching powder per day would be 30 kg (option C) to treat the city supply of water with a chlorine dosage of 0.5 ppm.
City supply of water per day = 15000 cubic meters
Chlorine dosage = 0.5 ppm
To find:
Requirement of 25% bleaching powder per day
Solution:
1. Calculation of chlorine required
Chlorine dosage = 0.5 ppm
1 ppm = 1 mg/L
1 mg/L = 1 mg/1000 mL
1 mg/L = 1 mg/cubic meter
Chlorine required = 0.5 mg/cubic meter
Total chlorine required = Chlorine required x city supply of water per day
Total chlorine required = 0.5 mg/cubic meter x 15000 cubic meters
Total chlorine required = 7500 mg = 7.5 g
2. Calculation of bleaching powder required
Bleaching powder is used to provide chlorine to the water
Bleaching powder contains 25% chlorine by weight
Let the weight of bleaching powder required be x kg
Chlorine provided by x kg of bleaching powder = 25% of x kg
Chlorine provided by x kg of bleaching powder = (25/100) x x kg
Chlorine provided by x kg of bleaching powder = 0.25 x kg
Chlorine provided by x kg of bleaching powder = 250 x g
As 1 g of bleaching powder contains 0.25 g of chlorine
Therefore, x kg of bleaching powder contains = (250/0.25) g of bleaching powder
x kg of bleaching powder contains = 1000 g = 1 kg of bleaching powder
3. Calculation of bleaching powder required per day
From step 2, we know that 1 kg of bleaching powder provides 250 g of chlorine
Total chlorine required per day = 7.5 g
Total bleaching powder required per day = (7.5 g / 250 g) x 1 kg
Total bleaching powder required per day = 0.03 kg = 30 kg
Therefore, the requirement of 25% bleaching powder per day would be 30 kg (option C) to treat the city supply of water with a chlorine dosage of 0.5 ppm.
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A city supply of 15000 cubic meters of water per day is treated with a...
A city must treat about 15000 m³/day of water. Flocculation particles are produced by coagulation and a column analysis indicates that an overflowrate of 20 m/day will produce satisfactory removal at a depth of 3.5m.Determine the size of a) the required rectangular settling tanks b) the required circular settling tanks
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A city supply of 15000 cubic meters of water per day is treated with a chlorine dosage of 0.5 ppm. For this purpose, the requirement of 25% bleaching powder per day would be:a)300 kgb)75 kgc)30 kgd)750 kgCorrect answer is option 'C'. Can you explain this answer?
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