a$)$ A laboratory provides the following solids analysis for a wastewater sample: $TS=200m\frac{g}{L}$;$TDS=30m\frac{g}{L}$;$FSS=30m\frac{g}{L}.$ Determine the tatal cusnended solids concentration of this sample and analyze whether this sample has appreciable organic matter or not.

b$)$ The organic matter present in municipal wastewater is removed in an aerated biological $m^3(4\mathrm{.}6m9m36m)$ and the yield coefficient $Y$ is $0\mathrm{.}5mgVS\frac{S}{m}gBO{D}_5,$ estimate the mass of microorganisms $($measured as VSS$)$ produced daily due to the consumption of organic matter by microorganisms in the aeration basin.