$3)$ An alum $($Al$2($S$04)3$ x $12$ H$20)$ dose of $105$ mg$/$L is added during rapid mix and coagulation. a$)$ The alum is delivered as a slurry with $17\%$ solids by weight and a specific gravity of $1\mathrm{.}72.$ b$)$ How much sodium bicarbonate $($NaHCO$3)$ would need to be added in kg per day to c$)$ If dewatering of sedimentation residuals brings the solids content of the sludge up to What flow rate of the slurry will be added to the rapid mixers $($in L$/$hr$)?$ negate the removal of alkalinity? $75\%,$ what is the wet mass of aluminum hydroxide sludge that will be disposed in Mg $($megagram$)/$week$?$ Please clearly markout a$,$ b$,$c in ans Flow Max. Flow pH Alkalinity $275$ LPCD $500$ LPCD $6\mathrm{.}71\mathrm{.}55$ meq$/$L Winter Temp Summer Temp. TDS $4$C $22$C $245$ mg$/$L Turbidity$75-125$ NTU