15. 15. Paul has been designated as our newest sustainable engineer and land app

Question

15. 15. Paul has been designated as our newest sustainable engineer and land application designer, so he P was given the task of designing the recycling system for a city of 50,000 people. The crop to is alfalfa that can utilize 400 l b nitrogen per acre and 70 inches of water. The wastewater flow is 5 acres of MGD (million gallons per day) and has a total nitrogen concentration of 15 mg/L How many alfalfa should be irrigated is lost to denitrification and thus not available to the plants. Useful conversion to effectively utilize the nitrogen if you consider that 20% of the nitrogen factors 1 ac-ft- 325830 gallons 2.205 lb = 1 kg 43560 ft2 1 acre

Explanation / Answer

Wastewater flow (Q) = 5 million gallons per day = 668402.778 ft3/day

Nitrogen concentration in wastewater (C) = 15 mg/L = 9.364 x 10-4 lb/ft3

Mass of nitrogen in daily wastewater flow = 9.364 x 10-4 x 668402.778 = 625.905 lb

Mass of nitrogen available to the plants = 0.8 x 625.905 = 500.724 lb

Alfalfa can utilize 400 lb nitrogen per acre.

So, area of alfalfa to be irrigated = 500.724 / 400 = 1.252 acre

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