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Q) Determine using the NRC formula, the BOD5 of the effluent from a single-stage, low-rate trickling...

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Civil Engineering

Q) Determine using the NRC formula, the BOD5 of the effluentfrom a single-stage, low-rate trickling filter that has a filtervolume of 1,500 m3 , a hydraulic flow rate of 0.26 m3/s, and arecirculation ratio of 1.5. The influent BOD5 is 360 mg/L. Wouldthe single stage be sufficient to achieve the WHO BOD efficacy? Ifnot how can you improve the system efficiency and provide thenecessary calculations?

Q) A. Design a set of three rectangular grit basins withproportional flow weir for a plant which has a max flow of 97,500m3/day, an average flow of 75,000 m3/day and a minimum flow of30,000 m3/day. Make the max depth equal to the width. The designvelocity (Vh) is 0.5 m/s. B. Design a set of three parabolicchannel for the same flow rates and design velocity in branch Aabove.

Abdul-Rahim Taysir

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