One of the National Academy of Engineering Grand Challenges for Engineering is Manage the Nitrogen Cycle. It is important to control the agricultural impact on the nitrogen cycle as engineers attempt to provide a sustainable food supply. To grow an experimental crop to test a new​ fertilizer, you create a small “farm” with the soil at a depth of 9.5 inches​ [in]. You use 200 buckets of​ soil, and each bucket holds 5 gallons​ [gal] of soil. What is the area of your “farm”in units of square feet [ft2​]?

Problem 4. A small community with a population of 25,200 is seeking your services as a consulting environmental engineer. They have tested their drinking water supply for coliform organisms by the fermentation tube method (five 10 ml portions per sample). They have come up with the following tabulated results for their April 2023 samples: No. of Samples 1 1 2 0 3 24 No. of + portions 5 4 3 2 1 0 No. of - portions 0 1 2 3 4 5 a. What is the calculated monthly average MPN? b. Just by looking at the calculated MPN can you comment on the safety of the drinking water of your client? -coliforms/100 ml.

You are provided with the following information about a municipal wastewater treatment plant. This plant uses the traditional activated-sludge process. Assume the microorganisms are 55 percent efficient at converting food to biomass, the organisms have a first-order death rate constant of 0.050/day, and the microbes reach half of their maximum growth rate when CE 3059 Page 2 of 2the BOD5 concentration is 10.0 mg/L. There are 150,000 people in the community (their wastewater production is 225 L/day-capita, 0.10 kg BOD5/capita-day). The effluent standard is BOD5 = 20 mg/L and TSS = 20 mg/L. Suspended solids were measured as 4,300 mg/L in a wastewater sample obtained from the aeration tank, 15,000 mg/L in the secondary sludge, 200 mg/L in the plant influent, and 100 mg/L in the primary clarifier effluent. The mean cell residence time is 4.0 days. a. What is the design volume of the aeration basin in cubic meters?b. What is the aeration basin detention time? c. How many kg of secondary dry…

A wastewater treatment plant will use flocculation as a unit process. The flocculator tank is 7500 L and the wastewater temperature is 30 degrees Celsius. If the tank is provided with 50 W, what is the velocity gradient for this process?

ENVIRONMENTAL ENGINEERING a). Given that in a Simple Phosphorus Model the Phosphorus Balance indicates that the Rate of Addition of Phosphorus equals the Rate of Removal of Phosphorus, state the Phosphorus Balance Equation and fully define each term used.   b). A phosphorus limited lake with surface area equal to 100 x 106 m2 is fed by a 20.0 m3/s stream that has a phosphorus concentration of 0.015mg/L. In addition, effluent from a point-source adds 1 g/s of phosphorus. The phosphorus settling rate is 10 m/yr. Estimate the average total phosphorus concentration.    c). (ii) What rate of phosphorus removal at the wastewater treatment plant would be required to keep the concentration of phosphorus in the lake at an acceptable level of 0.015mg/L?