## How Much Kla Of Tap Water

9.1 The value of (KLa)20 for a certain industrial waste is 2.46 per hour and the value of (KLa)w at 25°C = 2.77 per hour. What is the value of the temperature correction factor?

9.2 The value of (KLa)w at 25°C = 2.77 per hour. If the value of the temperature correction factor is 1.024, what is the value of (KLa)20?

9.3 The value of (KLa)w = 2.77 per hour. If the value of the temperature correction factor is 1.024 and the value of (KLa)20 = 2.46 per hour, at what temperature is the value of (KLa)w for?

9.4 A chemical engineer proposes to purchase an aerator for an activated sludge reactor. In order to do so, he performs a series of experiments obtaining the following results: AOR = 1.30 kg/m3 • day, and j = 0.94. The aeration is to be maintained to effect a dissolved oxygen concentration of 1.0 mg/L at 25°C in the reactor. The SOR specified to the manufacturer of the aerator is 2.05 kg/m • day. Determine the value of a.

9.5 A chemical engineer proposes to purchase an aerator for an activated sludge reactor. In order to do so, he performs a series of experiments obtaining the following results: a = 0.91, and j = 0.94. The aeration is to be maintained to effect a dissolved oxygen concentration of 1.0 mg/L at 25°C

in the reactor. If the SOR specified to the manufacturer of the aerator is 2.05 kg/m • day, what was the AOR?

9.6 A chemical engineer proposes to purchase an aerator for an activated sludge reactor. In order to do so, he performs a series of experiments obtaining the following results: a = 0.91, and AOR = 1.30 kg/m • day. The aeration is to be maintained to effect a dissolved oxygen concentration of 1.0 mg/L at 25°C in the reactor. The SOR specified to the manufacturer of the aerator is 2.05 kg/m3 • day. Determine the value of j.

9.7 A chemical engineer proposes to purchase an aerator for an activated sludge reactor. In order to do so, he performs a series of experiments obtaining the following results: a = 0.91, j = 0.94, and AOR = 1.30 kg/m3 • day. The aeration is to be maintained to effect a dissolved oxygen concentration of 1.0 mg/L at 25°C in the reactor. The SOR specified to the manufacturer of the aerator is 2.05 kg/m • day and the concentration of dissolved oxygen at 20°C and one atmosphere pressure of tap water is 9.2 mg/L. The Arrhenius temperature correction factor is 1.024. From these data, calculate the saturation dissolved oxygen concentration of tap water corresponding to the temperature of the proposed reactor.

9.8 A chemical engineer plans to purchase an aerator for a proposed activated sludge reactor. In order to do so, he performs a series of experiments obtaining the following results: a = 0.91, j = 0.94, and AOR = 1.30 kg/m3 • day. The average temperature of operation of the reactor is expected to be 25°C. The SOR specified to the manufacturer of the aerator is 2.05 kg/m • day and the concentration of dissolved oxygen at 20°C and one atmosphere pressure of tap water is 9.2 mg/L. The Arrhenius temperature correction factor is 1.024. The saturation dissolved oxygen concentration of tap water corresponding to the temperature of the proposed reactor at 25°C is 8.4 mg/L. Using these data, calculate the dissolved oxygen concentration at which the reactor can be maintained.

9.9 A chemical engineer plans to purchase an aerator for a proposed activated sludge reactor. In order to do so, he performs a series of experiments obtaining the following results: a = 0.91, j = 0.94, and AOR = 1.30 kg/m3 • day. The average temperature of operation of the reactor is expected to be 25°C.

The SOR specified to the manufacturer of the aerator is 2.05 kg/m • day. The Arrhenius temperature correction factor is 1.024. The saturation dissolved oxygen concentration of tap water corresponding to the temperature of the proposed reactor at 25°C is 8.4 mg/L. The proposed reactor is to be maintained at a dissolved oxygen concentration of 1.0 mg/L. Using these data, calculate the dissolved oxygen at 20°C and one atmosphere pressure of tap water.

9.10 A chemical engineer plans to purchase an aerator for a proposed activated sludge reactor. In order to do so, he performs a series of experiments obtaining the following results: a = 0.91, fi = 0.94, and AOR = 1.30 kg/m3 • day. The average temperature of operation of the reactor is expected to be 25°C. The SOR specified to the manufacturer of the aerator is 2.05 kg/m • day. The saturation dissolved oxygen concentration of tap water corresponding to the temperature of the proposed reactor at 25°C is 8.4 mg/L. The proposed reactor is to be maintained at a dissolved oxygen concentration of 1.0 mg/L. The dissolved oxygen at 20°C and one atmosphere pressure of tap water is 9.2 mg/L. Using these data, calculate the Arrhenius temperature correction factor 6.

9.11 A chemical engineer plans to purchase an aerator for a proposed activated sludge reactor. In order to do so, he performs a series of experiments obtaining the following results: a = 0.91, fi = 0.94, and AOR = 1.30 kg/m3 • day. The SOR specified to the manufacturer of the aerator is 2.05 kg/m3 • day. The saturation dissolved oxygen concentration of tap water corresponding to the temperature of the proposed reactor is 8.4 mg/L. The proposed reactor is to be maintained at a dissolved oxygen concentration of 1.0 mg/L. The dissolved oxygen at 20°C and one atmosphere pressure of tap water is 9.2 mg/L. The Arrhenius temperature correction factor 6 is 1.024. Using these data, calculate the average temperature that the proposed reactor will be operated.

9.12 A civil engineer performs an experiment for the purpose of determining the values of some aeration parameters of a particular wastewater. (KLa)20 and a were found, respectively, to be 2.46 per hr and 0.91. Calculate (KLa)W,20.

9.13 A civil engineer performs an experiment for the purpose of determining the values of some aeration parameters of a particular wastewater. (KLa)W,20 and a were found, respectively, to be 2.25 per hr and 0.91. Calculate (KLa) 20.

9.14 An environmental engineer performs an experiment for the purpose of determining the value of fi of a particular wastewater. If fi is found to be equal to 0.89 and the temperature of the wastewater is 25°C, calculate

9.15 An environmental engineer performs an experiment for the purpose of determining the value of fi of a particular wastewater. If fi is found to be equal to 0.89 and the [Cos,W] of the wastewater after shaking the jar thoroughly is 7.5 mg/L , calculate [Cos].

9.16 An environmental engineer performs an experiment for the purpose of determining the value of fi of a particular wastewater in the mountains of Allegheny County, MD. The prevailing barometric pressure is 92,974 N/m2

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