A. Biological oxygen treatment
B. Coagulation and filtration
C. Adsorption in ion exchange materials
D. None of these
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Related Mcqs:
- The amount of chemical coagulant added for treatment of polluted water ______________ with increase in temperature of the polluted water to be treated?
- A. Decreases B. Increases C. Remain constant D. May increase or decrease; depends on the chemical characteristics of polluted water...
- 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...
- Which of the following is the most efficient for removal of very finely divided suspended solids and colloidal matter from the polluted water stream ?
- A. Sedimentation tank B. Circular clarifier C. Mechanical flocculation D. Chemical coagulation...
- Replenishment of dissolved oxygen in water stream polluted with industrial waste occurs by________________?
- A. Natural aeration of water stream B. Photosynthetic action of algae C. Both A. & B. D. Neither A. nor B....
- Waste/polluted water discharged from electroplating, blast furnace and coal mining industries contain mainly _____________ substances?
- A. Radioactive B. Organic C. Inorganic D. None of these...
- H2S present in gaseous stream can be removed by adsorption on _____________________?
- A. Silica gel B. Active carbon C. Bog iron D. Limestone powder...
- ____________ substances present in sewage are removed in grit chamber during sewage treatment?
- A. Organic B. Fatty C. Inorganic D. Dissolved...
- Which of the following radioactive wastes emits all α, β & γ rays and hence is the most hazardous of all radioactive emitters ?
- A. I-131 B. Sr-90 C. Au-198 D. Ra-226...
- The main pollutant in waste water discharged from a petroleum refinery is oil (both in free and emulsified form). Free oil is removed by_________________?
- A. Biological oxygen pond B. Aerated lagoons C. Trickling filters D. Gravity separator having oil skimming devices...
- Which is the best and the most effective method for the removal of organic contaminant present in the polluted water in very small quantity (say < 200 mg/litre) ?
- A. Lagooning B. Activated carbon adsorption C. Biological oxidation pond D. Chemical coagulation...
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