Ellerbe Creek, a large stream at normal veloc ity, is the recipient for the wast

Question

Ellerbe Creek, a large stream at normal veloc ity, is the recipient for the wastewater from the 10 mgd Durham Northside Wastewater Treat- ment Plant. It has a mean summertime flow of 0.28 m'/s, a temperature of 24°C, and a veloc- ity of 0.25 m/s. Assume the dissolved oxygen is saturated and the ultimate BOD is O mg/L The wastewater characteristics are 8.5 Temperature = 28°C Ultimate BOD (L) 40 mg/L k= 0.23 day-1 Dissolved oxygen 2 mg/L The total stream length from outfall to river is 14 miles, at which point it empties into the Neuse River. (Note: Use Table 8.3 for k2.) a. Should the State of North Carolina be con- cerned about the effect of this discharge on Ellerbe Creek?

Explanation / Answer

[K1*L0]*[exp (-K1*t)-exp (-K2*t)]/ (K2-K1) + D0exp (-K2*t)

Use the above formula and calculate the value with desired k1 and k2.

Usually the desired DO is 4.0mg/L.

If the value is fluctuated then the state of carolina should be concerned about the effect of the discharge.

Note: Please specify the required material in your question as your question seems to be incomplete.

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