search
arrow-left Previous
Next arrow-right
Q: The different processes underwater treatment are given under List 1, and the purpose of the treatment process is given under List 2. Match the items in List 1 with those under List 2 using the codes in lists. List 1 C. Filtration D. Aeration E. Zeolite process F. Ozone treatment List 2 1. Disinfection 2. Removal of calcium and magnesium cations. 3. Removal of suspended impurities 4. Process converts Iron and manganese from their soluble state to insoluble state.
  • A. C – 3, D – 2, E – 1, F – 4
  • B. C – 3, D – 4, E – 2, F – 1
  • C. C – 4, D – 3, E – 1, F – 2
  • D. C – 2, D – 1, E – 3, F – 4
Correct Answer: Option B - Filtration–After removal of most floc by sedimentation the water is subjected to filtration to remove remaining suspended particles and unsettled floc. The most common filter is rapid sand filter. Aeration–Aeration is one of the important unit operation of gas transfer. • It converts iron and manganese from their soluble states to their insoluble states, so that these can be precipated and removed. • It removes tastes and odours caused by gases due to organic decomposition. • It removes hydrogen sulphide, and hence odour due to this is also removed. Zeolite Process–For softening of water by zeolite process, hard water is percolated at a specified rate through a bed of zeolite. Zeolite process is use for removal of calcium and magnesium cations. Ozone Treatment–Its disinfecting action is effective over a wide temperature and pH range. Ozone rapidly oxidizes organic impurities, such as alkyl-benzene sulphonate (ABS).
B. Filtration–After removal of most floc by sedimentation the water is subjected to filtration to remove remaining suspended particles and unsettled floc. The most common filter is rapid sand filter. Aeration–Aeration is one of the important unit operation of gas transfer. • It converts iron and manganese from their soluble states to their insoluble states, so that these can be precipated and removed. • It removes tastes and odours caused by gases due to organic decomposition. • It removes hydrogen sulphide, and hence odour due to this is also removed. Zeolite Process–For softening of water by zeolite process, hard water is percolated at a specified rate through a bed of zeolite. Zeolite process is use for removal of calcium and magnesium cations. Ozone Treatment–Its disinfecting action is effective over a wide temperature and pH range. Ozone rapidly oxidizes organic impurities, such as alkyl-benzene sulphonate (ABS).

Explanations:

Filtration–After removal of most floc by sedimentation the water is subjected to filtration to remove remaining suspended particles and unsettled floc. The most common filter is rapid sand filter. Aeration–Aeration is one of the important unit operation of gas transfer. • It converts iron and manganese from their soluble states to their insoluble states, so that these can be precipated and removed. • It removes tastes and odours caused by gases due to organic decomposition. • It removes hydrogen sulphide, and hence odour due to this is also removed. Zeolite Process–For softening of water by zeolite process, hard water is percolated at a specified rate through a bed of zeolite. Zeolite process is use for removal of calcium and magnesium cations. Ozone Treatment–Its disinfecting action is effective over a wide temperature and pH range. Ozone rapidly oxidizes organic impurities, such as alkyl-benzene sulphonate (ABS).