Civil Engineering - Water Supply Engineering - Discussion

Ozone method is very costly, that's why we use chlorination.

The Answer should A.

The correct Answer is A.

Please explain the correct answer.

Ozone is 12 times less soluble in water than chlorine, so the maximum disinfectant concentrations you can reach are much lower when you use ozone. Moreover, ozone breaks down very rapidly, and the higher the temperature or the pH, the more rapidly it decays. If the water is rich in organic compounds or suspended solids, a lot of the ozone may be consumed through reactions with these other contaminants, leaving an insufficient amount available to destroy germs. That's why ozone is not an economical option for wastewater with very high amounts of suspended solids or total organic compounds.

There are several disinfection methods which can be applied to high water flows. They can be divided.

Into three main groups:

βUV radiation.
β Ozone.
βChlorine.

The first two groups do not generate significant Disinfection By-Products (DBP\'s) nor interact.

Significantly with the water, they are supposed to disinfect. Despite their efficient disinfecting.

Qualities, they do not guarantee a long-term disinfection, up until the water reaches the consumer Chlorine disinfection, on the other hand, presents the advantages of efficiency and durability.

The concept of Residual Concentration of Disinfectant is associated with disinfection durability. In fact, so as to guarantee the water supply system's disinfection, we need a residual concentration disinfectant to prevent recontamination by pathogenic or indicator micro-organisms, which can Originate in the biofilm formed inside the system, as well as in negative pressure areas (created by Pipe cracks, fissures, etc).

Option A is correct.

Thanks guys for giving your important views. It helps a lot.

Ozone treartment costly as compared to other members not suitable for big cities.

The correct answer is A.