A municipal wastewater with 220 mg/l of BOD and 260 mg/l of suspended solids is processed in a two-stage trickling-filter plant. Calculate the following per 1.0 m3 of wastewater treated:
(a) the dry solids production in primary and secondary treatment, assuming 50% SS removal and 35% BOD reduction in primary settling and a k value of 0.40 applicable for the trickling-filter secondary;
(b) the daily sludge volume, both primary and secondary solids, assuming 5.0% solids content. (A specific gravity of 1.0 can be assumed for the wet sludge.)
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