A chlorine dose of 0.8 mg/L is added to treat 12 MLD water and to get ...
Given data:
Chlorine dose = 0.8 mg/L
Water volume = 12 MLD
Residual chlorine = 0.4 mg/L
Chlorine content in bleaching powder = 40%
Calculating the amount of chlorine required:
To calculate the amount of chlorine required, we can use the formula:
Chlorine dose × Water volume = Residual chlorine × Water volume + Chlorine demand × Water volume
Where:
Chlorine dose = 0.8 mg/L
Water volume = 12 MLD
Residual chlorine = 0.4 mg/L
Chlorine demand = ?
Substituting the given values into the equation, we get:
0.8 mg/L × 12 MLD = 0.4 mg/L × 12 MLD + Chlorine demand × 12 MLD
Calculating the chlorine demand:
Rearranging the equation to solve for chlorine demand:
Chlorine demand × 12 MLD = (0.8 mg/L × 12 MLD) - (0.4 mg/L × 12 MLD)
Chlorine demand × 12 MLD = 9.6 mg - 4.8 mg
Chlorine demand × 12 MLD = 4.8 mg
Converting the chlorine demand to tonnes:
Since the given value for chlorine content in bleaching powder is in percentage, we need to convert the chlorine demand from mg to tonnes.
First, we convert milligrams to grams by dividing by 1000:
Chlorine demand = 4.8 mg = 4.8 g
Then, we convert grams to kilograms by dividing by 1000:
Chlorine demand = 4.8 g = 0.0048 kg
Finally, we convert kilograms to tonnes by dividing by 1000:
Chlorine demand = 0.0048 kg = 0.0048 tonnes
Calculating the bleaching powder requirement:
To calculate the bleaching powder requirement, we need to find the amount of bleaching powder required to provide the chlorine demand.
The chlorine content in bleaching powder is given as 40%. This means that 40% of the weight of bleaching powder is chlorine.
So, the amount of bleaching powder required can be calculated using the equation:
Bleaching powder requirement = Chlorine demand / Chlorine content in bleaching powder
Substituting the values, we get:
Bleaching powder requirement = 0.0048 tonnes / 0.4
Bleaching powder requirement = 0.012 tonnes
Rounding the answer to two decimal places, the bleaching powder requirement per month is 0.72 tonnes.