Question

Q) Determine using the NRC formula, the BOD5 of the effluent from a single-stage, low-rate trickling filter that has a filter volume of 1,500 m3 , a hydraulic flow rate of 0.26 m3/s, and a recirculation ratio of 1.5. The influent BOD5 is 360 mg/L. Would the single stage be sufficient to achieve the WHO BOD efficacy? If not how can you improve the system efficiency and provide the necessary calculations?

Q) A. Design a set of three rectangular grit basins with proportional flow weir for a plant which has a max flow of 97,500 m3/day, an average flow of 75,000 m3/day and a minimum flow of 30,000 m3/day. Make the max depth equal to the width. The design velocity (Vh) is 0.5 m/s. B. Design a set of three parabolic channel for the same flow rates and design velocity in branch A above.

Abdul-Rahim Taysir

Answer 1

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