An aerated grit chamber is used for the treatment of municipal wastewater. The average flow rate is 0.6 m/s. Assume that

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An Aerated Grit Chamber Is Used For The Treatment Of Municipal Wastewater The Average Flow Rate Is 0 6 M S Assume That 1 (64.84 KiB) Viewed 50 times

An aerated grit chamber is used for the treatment of municipal wastewater. The average flow rate is 0.6 m/s. Assume that the peaking factor is 2.5 (peak flow/average flow) (Refer to Table Q2 for further data). Estimate: i) the peak design flow rate in m/s, [2 marks] ii) the grit chamber volume in m', [3 marks) iii) the dimensions (length, width and depth) of the grit chamber in m, [8 marks) iv) the air supply requirement in m'ls and [3 marks) v) the average quantity of grit that must be handled in m'a. [4 marks) Table Q2: Typical design information for aerated grit chamber Value Item Range Typical Detention time (at peak flow), min 2-5 3 Depth, ft 7-16 Dimensions: Length, ft 25-65 Width, ft 8-23 Width-depth ratio 1:1 – 5:1 1.5:1 Length-width ratio 3:1 - 5:7 4:2 2.0-5.0 3.5 Air supply, fil(min. fi of length) 0.5-27 2.0 Grit quantities, fi Mgal 21 maks