1. What are the two advantages of tube settler as compared tothe conventional sedimentation?
2. Compare the following factors for chlorine and ozone
- Disinfection time and dose
- Residual disinfection
- Interference by raw water turbidity
- THM formation
3. The water from a river used for water supply contains 6 mg/Lof BOD5, 2 mg/L of aldrin (pesticide residue) and 14 NTUof turbidity. Suggest a treatment process which is technically andeconomically viable. Explain the reason why you selected thistreatment system?
4.Under what conditions is powdered activated carbon preferredover granulated activated carbon adsorption system? and Why?
5.Explain two situations where the dissolved air flotation (DAF)is preferred over a sedimentation tank in drinking watertreatment.
