A sludge thickener receives sludge from a primary clarifier and a secondary clarifier. The primary clarifier sludge flow rate is $0\mathrm{.}01MGD$ with a total

suspended solids $($TSS$)$ concentration of $60,000m\frac{g}{L}.$ The secondary clarifier sludge flow rate is $0\mathrm{.}1MGD$ with a TSS concentration of $10,000m\frac{g}{L}.$

The thickener overflow flow rate is $0\mathrm{.}08MGD$ with a TSS concentration of $500m\frac{g}{L}.$ The underflow is dewatered using a belt filter press. The solids

loading to the filter press is most nearly

A$.1600lb\frac{m}{?}$ day

B$.11,000lb\frac{m}{?}$ day

C$.13,000lb\frac{m}{?}$ day

D$.15,000lb\frac{m}{?}$ dayA venturi meter with an $8$ in diameter throat is installed in a $12$ in diameter water line. The Venturi meter is perfectly smooth, such that the coefficient of velocity is $1\mathrm{.}00.$ An attached mercury manometer registers a $4$ in differential. The specific weight of mercury is $0\mathrm{.}491$ dbf$/$in$3,$ the specific weight of the water is $0\mathrm{.}0361$ lbf$/$in$3.$ The volumetric flow rate is mostly? $1\mathrm{.}7$ ft$3/$sec$,5\mathrm{.}2$ ft$3/$sec$,6\mathrm{.}7$ ft$3/$sec or $8\mathrm{.}3$ ft$3/$sec$.$