Design two $(2)$ equal$-$volume mesophilic anaerobic digesters.

Amount of sludge: $30,000$ GPD

$\%$ solids: $4\mathrm{.}5\%(80\%$ primary and $20\%$ WAS$)$

$78\%$ VS $\frac{?}{?}$ TS

Average raw sludge temperature $=70F$

Digester temperature: $)=(98F$

The final product is Class B biosolids $(38\%$ VSR$).$

$24-$day SRT

Digester volume Safety factor $=1\mathrm{.}1$

Completely mixed pancake$-$type tank

Cone bottom $($Use Cone Depth: Radius $=1$:$4)$

Use $14f{t}^3$ Biogas Volume$/$lb$.$ VSR

Boiler efficiency $=80\%$

Heat requirement Safety factor $=1\mathrm{.}45$

Heat loss $=1BT\frac{U}{h}r\frac{.}{1000}f{t}^3$

Final dewatered biosolids TS $=28\%$

Dewatering system operation: $5$ days$/$week$.$; $50$ wks$./$year

Biosolids Hauling cost $=$$$\frac{80}{?}$ ton

a$)$ Digester volume $(f{t}^3,$ Apply safety factor$)$

b$)$ Dimension of digester in ft$.($Diameter$,$ Sidewall depth, Cone depth$)$

c$)$ Organic loading load $($Ib$.$ VS$/$ft $\frac{{?}^3}{?}$ day$)$

d$)$ Daily biogas generation $(f\frac{t^3}{?}$ day$)$

e$)$ Heat generation from generated biogas $($MMBtu$/$day$)$

f$)$ Total Heating requirement $($BTU$/$hr$.,$ Apply safety factor$)$

g$)$ Final dewatered biosolids amount $($Ib$./$day$)$

h$)$ Annual hauling cost estimation $($$$/$year$)$