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A wastewater treatment plant discharges treated sewage into a river, the effluent contains a daily average of 15mg/L of NH4+. The rate constant of NH4+ bio-consumption is 0.03 1/d. What will be the concentration of NH3 as mg/L in the river at: (i) immediately at the point of discharge (ii) after 200 seconds at the downstream The equation: NH4 + 2O2 =N03 + 2H + H2O + energy

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