L TS and $1200mg$ comments.

$4.$ What are half$-$life, rate constant and solubility product of any compound?

$5.$ Define Turbidity, Hardness, Alkalinity, TOC, BOD and COD?

$6.$ What are the differences between sludge and wastewater?

$7.$ How do you calculate hardness $($TH$),$ NCH$,$ and the alkalinity as well as the total dissolved solids $($TDS$).$

$8.$ Select different treatment units to remove the following items from water:

a$)$ Total solids; b$)$ Turbidity; c$)$ Hardness; d$)$ E$-$coli pathogen; e$)$ Dissolved metals; f$)$ BOD &COD; g$)$ Odors and Taste

b$)$ Show the treatment flowchart for surface and groundwater treatment?