Gce Model Questions Vol1 2023 Chemistry Question 11
Practice objective / multiple choice question 11 from the 2023 Gce Model Questions Vol1 Chemistry examination.
A wastewater sample contains \(150\) mg/L of \(\mathrm{NH_3\! -\! N}\) and \(80\) mg/L of \(\mathrm{PO_4^{3-}}\). The treatment plant first nitrifies \(80\)% of the ammonia to nitrate, then denitrifies \(70\)% of the nitrate to nitrogen gas. Phosphate is removed by precipitation with a \(60\)% efficiency. After treatment the effluent is mixed with river water in a \(1:4\) volume ratio (treated : river). Assuming the river water contains negligible nitrogen, calculate the final concentration of total nitrogen (as \(\mathrm{N}\)) in the mixed discharge (in mg/L).
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About This Question
This is Gce Model Questions Vol1 2023 Chemistry Question 11. It is one of the objective questions from the 2023 Gce Model Questions Vol1 Chemistry examination.
Difficulty level: Hard .
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