Question $1$:

A town wants to construct a $4m$ deep

rectangular horizontal$-$flow sedimentation tank

to treat its wastewater with a detention time of

$2hr.$ Before treatment, a settling column test

was conducted to determine the type of

settling. The results from the test indicated that

the particles are non$-$flocculating $($i$.$e$.,$ type I

settling$),$ with settling test data shown in the

table below. The influent total suspended solids

$($TSS$)$ concentration is $252m\frac{g}{L}.$

$1.$a$)$ What is the removal efficiency $(\%)$ of the

sedimentation basin?

$1.$b$)$ What should the surface area and volume

of the sedimentation tank be if the wastewater

flow rate is $7500\frac{m^3}{?}$ day?

Enter your answers in the box using the format

below. Make sure to include the units of your

answers.

Area:

Volume:

$1.$c$)$ What is daily $($every $24$ hours$)$ mass of

sludge $(kg)$ that will be produced?A town wants to construct a $4$ m deep rectangular horizontal$-$flow sedimentation tank to treat its wastewater with a detention time of $2$ hr$.$ Before treatment, a settling column test was conducted to determine the type of settling. The results from the test indicated that the particles are non$-$flocculating $($i$.$e$.,$ type $|$ settling$),$ with settling test data shown in the table below. The influent total suspended solids $($TSS$)$ concentration is $252$ mg$/$L$.$

$1.$a$)$ What is the removal efficiency $(\%)$ of the sedimentation basin?