A. Silica gel
B. Active carbon
C. Bog iron
D. Limestone powder
Related Mcqs:
- Radioactive substances present in the polluted water stream can be removed by_________________?
A. Biological oxygen treatment
B. Coagulation and filtration
C. Adsorption in ion exchange materials
D. None of these - Oilish impurities present the effluent discharged from the electroplating industry is normally not removed by _____________________?
A. Chemical coagulation
B. Floatation & skimming
C. Centrifugation
D. Ultra filtration - Beyond what concentration of H2S in air, acute danger to human life exists ?
A. 50 ppm
B. 100 ppm
C. 300 ppm
D. 700 ppm - Fine grit present in sewage is removed in the _____________ during sewage treatment?
A. Grit chamber
B. Detritus tank
C. Trickling filter
D. Skimming tank - In large thermal power stations very fine particulates present in flue gas are removed by___________________?
A. Wet scrubber
B. Bag filter
C. Electrostatic precipitators
D. Dust catcher - Iron & manganese present as pollutant in water cannot be removed by__________________?
A. Ion exchange process
B. Oxidation followed by settling & filtration
C. Lime soda process or manganese zeolite process
D. Chlorination - Suspended solid present in the waste water generated in blast furnace gas cooling and cleaning plant is removed by__________________?
A. Biological oxygen pond
B. Radial settling tank (thickener) using coagulant (lime & ferrous sulphate)
C. Lagoons
D. Filtration - Soluble silica present in boiler feed water can be removed by______________________?
A. Coagulation
B. Filtration
C. Anion exchanger
D. Preheating it - ____________ substances present in sewage are removed in grit chamber during sewage treatment?
A. Organic
B. Fatty
C. Inorganic
D. Dissolved - Iron & manganese present in the polluted water is removed by __________________?
A. Simple filtration
B. Oxidation followed by settling & filtration
C. Chemical coagulation
D. Chlorination only
