Question

The BOD of a sewage entering a Trickling Filter is 200mg/l. if the effluent of the sewage of

Trickling Filter is 40 mg/l. Then the efficiency of the trickling filter is?​

Answer 1

The efficiency of the Trickling filter is 80%

Explanation:

• Efficiency is the measure of the tendency of the filter to remove certain impurities.

• More removal, more efficient will be the filter.

• The formula for calculating the efficiency is given by

• [(Initial value-final value)/initial value]*100

Putting the values in the formula, we get

• =[(200-40)/200]*100

• =80%

Therefore, the filter has removed 80% of the BOD from the effluent.