A wastewater treatment plant disposes of its effluent in a surface stream. Characteristics of the stream and effluent are shown below.ParameterWaste waterStream waterWaste water mix stream waterFlow (m3/sec)0.24 Dissolved oxygen, mg/L17 BOD5 at 20°C, mg/L1002 Oxygen consumption rate (K1 at 20°C) (1/day)0.20.20.23Oxygen reaeration rate (K2 at 20°C) (1/day)-0.30.3For 20°C stream water temperature, the equilibrium concentration of oxygen = 9.17 mg/L. Assuming no temperature correction is required, answer the following: Calculate ultimate BOD of wastewater and stream water mix water?

A wastewater treatment plant disposes of its effluent in a surface str

1.	A wastewater treatment plant disposes of its effluent in a surface stream. Characteristics of the stream and effluent are shown below.ParameterWaste waterStream waterWaste water mix stream waterFlow (m3/sec)0.24 Dissolved oxygen, mg/L17 BOD5 at 20°C, mg/L1002 Oxygen consumption rate (K1 at 20°C) (1/day)0.20.20.23Oxygen reaeration rate (K2 at 20°C) (1/day)-0.30.3For 20°C stream water temperature, the equilibrium concentration of oxygen = 9.17 mg/L. Assuming no temperature correction is required, answer the following: Calculate ultimate BOD of wastewater and stream water mix water?
A.	8.5 mg/L
B.	9 mg/L
C.	9.5 mg/L
D.	9.76 mg/L
Answer» E.

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A wastewater treatment plant disposes of its effluent in a surface stream. Characteristics of the stream and effluent are shown below.ParameterWaste waterStream waterWaste water mix stream waterFlow (m3/sec)0.24 Dissolved oxygen, mg/L17 BOD5 at 20°C, mg/L1002 Oxygen consumption rate (K1 at 20°C) (1/day)0.20.20.23Oxygen reaeration rate (K2 at 20°C) (1/day)-0.30.3For 20°C stream water temperature, the equilibrium concentration of oxygen = 9.17 mg/L. Assuming no temperature correction is required, answer the following: Calculate ultimate BOD of wastewater and stream water mix water?
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