Subject: Environmental Prepare a sketch of water treatment and indicate the impurities removed in each stage.

SIEVE ANALYSIS Given the table below, calculate the Cumulative % Retained and % Passing for each sieve. Sieve Cumulative Cumulative Size Grams Retained %Retained %Passing 3/8 inch 0.0 No. 4 16.6 No. 8 64.5 No. 16 214.1 No. 30 389.2 No. 50 483.0 No. 100 543.4 No. 200 565.0 Total Wt. 573.0

For the following water, determine the amount of lime and soda hash in mg/L as CaCO3 required to soften the water to 80 mg/L hardness as CaCO3 Compound Concentration (mg/L as CaCO3) 44.2 CO₂ Ca2+ 87.4 Mg2+ 96.3 Nat 94.7 HCO3 204.6 SO42- 73.8

Write a note on Menard Vacuum Consolidation process.