Question: A city has a population of 800,000 with a water consumption of 250 l/d per person. The inflow to the public sewerage system is

A city has a population of 800,000 with a water consumption of 250 l/d per person. The inflow to the public sewerage system is 75%. The treated wastewater effluent is used in irrigation at an application rate of 5000 m/ha.year, and has nutrient concentrations of: Nitrogen (N) - 50 mg/l Phosphorus(P) - 10 mg/l Potassium (K) - 30 mg/l Determine: (1) (ii) C The area of land in hectares that can be irrigated The fertilizer contribution of the effluent in terms of N, P, K in kg/ha. year

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