An aerated clarifier-type unit for grit removal and preaeration is 12 ft square with an S-fl liquid depth. The wastewater flow is 0.80 mgd with an estimated grit volume of 3 ft 3/mil gal. A separate hopper-bottomed grit storage tank has a usable volume of 3 yd ’. Compute the detention time in the aerated unit and the estimated length of lime required to fill the storage tank with grit.
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