A
0.2 ppm
B
2 ppm
C
20 ppm
D
1 ppm
Residual chlorine of about 0.2 ppm is desired after 30 minutes of contact for disinfection.
Correct Answered :
Wrong Answered :
(i) Flocculation and sedimentation.
(ii) Filtration.
(iii) Reverse osmosis.
(iv) Electrodialysis.
A
(i) and (ii)
B
(iii) and (iv)
C
(ii) and (iii)
D
(i) and (iv)
Salinity can only be reduced effectively by reverse osmosis and electrodialysis.
Correct Answered :
Wrong Answered :
(i) Screening
(ii) Sedimentation
(iii) Disinfection
(iv) Filtration.
The correct sequence of treatments which are generally given to treat raw water supplies are
A
(i) (ii) (iii) (iv)
B
(i) (ii) (iv) (iii)
C
(i) (iii) (iv) (ii)
D
(iv) (iii) (ii) (i)
The usual treatment sequence is screening → sedimentation → filtration → disinfection.
Correct Answered :
Wrong Answered :