Waec Model Questions Vol1 2018 Chemistry Question 23
Practice objective / multiple choice question 23 from the 2018 Waec Model Questions Vol1 Chemistry examination.
A wastewater sample contains 120 mg/L phenol. It undergoes two consecutive treatments: (1) adsorption onto activated carbon removes 85% of phenol but adds 20 mg/L dissolved organic carbon (DOC); (2) a biological oxidation step lasting 30 min degrades phenol following first‑order kinetics with k = 0.15 min⁻¹ and consumes DOC at 0.4 mg DOC per mg phenol degraded. Assuming DOC is sufficiently available, what is the phenol concentration (mg/L) in the final effluent?
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About This Question
This is Waec Model Questions Vol1 2018 Chemistry Question 23. It is one of the objective questions from the 2018 Waec Model Questions Vol1 Chemistry examination.
Difficulty level: Hard .
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