1. The Harrisonburg Rockingham wastewater treatment plant discharges 12 million

Question

1. The Harrisonburg Rockingham wastewater treatment plant discharges 12 million gallons per day to the North River. Upstream of the discharge, the North River flows at 235 million gallons per day. If the North River contains 0.05 mg/L of phosphorus upstream of the discharge, and the wastewater contains 0.3 mg/L of phosphorus, what is the phosphorus concentration directly downstream of the discharge?

2. Using the inflow and outflow information from problem #2 above, calculate the decay rate for nitrogen at the plant. Assume that the wastewater treatment plant operates at steady state, and assume that the volume of the plant is 6 million gallons.

3. If the incoming nitrogen concentration in the problem above suddenly went up to 100 mg/L. What would the outgoing nitrogen concentration be 2 days later?

Explanation / Answer

1) Volume of discharge downstream x Phosphorous concentration downstream=Volume of discharge upstream x Phosphorous concentration upstream + Volume of discharge from factory x Phosphorous concentration from factory

247 million gallons * x mg/L= 235 million gallons * 0.05 mg/L +12 million gallons * 0.3 mg/L

On solving, x= 0.062 mg/L (Phosphorous concentration downstream of discharge)

2. 3. Information missing for 2 and 3 part.

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