Consider a municipal water treatment plant for a small community (Fig. P1.1). Waste water, 32,000 m 3

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Consider a municipal water treatment plant for a small community (Fig. P1.1). Waste water, 32,000 m3/day, flows through the treatment plant with a mean residence time of 8 hr, air is bubbled through the tanks, and microbes in the tank attack and break down the organic material

(organic waste) + O microbes CO,+H,O

typical entering feed has a BOD (biological oxygen demand) of 200 mg O2/liter, while the effluent has a negligible BOD. Find the rate of reaction, or decrease in BOD in the treatment tanks.Waste water, 32,000 m/day 200 mg 0 needed/liter Figure P1.1 Waste water treatment plant Mean residence time 7

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