Gce Model Questions Vol1 2022 Chemistry Question 36
Practice objective / multiple choice question 36 from the 2022 Gce Model Questions Vol1 Chemistry examination.
A factory discharges wastewater containing a biochemical oxygen demand (BOD\(_5\)) of 200 mg L\(^{-1}\) at a flow rate of 10 000 L s\(^{-1}\). The receiving river has a flow rate of 150 000 L s\(^{-1}\) and a background BOD\(_5\) of 5 mg L\(^{-1}\). Environmental regulations require that the BOD\(_5\) of the mixed water must not exceed 10 mg L\(^{-1}\). The factory can install a treatment plant that reduces the BOD\(_5\) of its effluent by a uniform percentage \(p\). What is the minimum percentage reduction \(p\) required to meet the regulation? Give your answer to one decimal place.
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About This Question
This is Gce Model Questions Vol1 2022 Chemistry Question 36. It is one of the objective questions from the 2022 Gce Model Questions Vol1 Chemistry examination.
Difficulty level: Hard .
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