engineering recuitment OSSC Combined Technical Services (ଓଡିଶା) Mock Test 2023-24 Environmental Engineering Quality of Water
The results of analysis of a sample of water are given below:
Turbidity = 10 mg/L; total dissolved solids = 450 mg/L; total hardness = 300 mg/L; Chlorides = 100 mg/L; Sulphates = 300 mg/L; Fluorides = 1 mg/L; Nitrates = 30 mg/L; Calcium = 75 mg/L; Magnesium = 200 mg/l; Iron = 3.0 mg/L. From the data given above, it can be inferred that the water needs:1
no treatment except disinfection
2
treatment for removal of iron, hardness, and fluorides
3
treatment for removal of iron, hardness, and sulphates
4
treatment for removal of calcium, magnesium, and chlorides