By :Nibedita Saha F-1 Submitted to:Mr. Pervez Submitted on:

About the video…. The video was about the treatment of raw water. It showed us how they treated raw water from Dongjiang river. It also thought us about the different processes in treating raw water,for example sedimentation, chlorination and filtration. Water receives lots of treatment before it enters our buildings and it is very safe for us to drink.

Touring the treatment works The tour guide took us to the real treatment works, where the real machines were doing their respective jobs. It was huge and exciting to watch. The guides also showed us how they added chemicals to the raw water and also showed us pictures of the bacteria that were present in the raw water. We also saw a model of the sedimentation process. It contained different types of rocks and soil. I am very proud of the workers who are working so hard and trying their best to keep the water quality clean and safe for us to drink.

How Water Is Treated During the water treatment process, raw water (untreated water) is dosed with chemicals for mixing and then passes to the clarifiers where coagulation and flocculation of the impurities in the water will take place. Settled water then flows into filters of sand or anthracite for removal of the more finely divided suspensions. The filtered water passes into contact tanks where dosed chlorine and lime are added to disinfect and control the alkalinity of the final treated water. Fluoride is also added to minimize the risk of dental decay. A small amount of residual chlorine is maintained in the water to keep it free from bacteria on the rest of its journey. The final water is pumped into a system of water mains, stored in service reservoirs and then supplied to the public.

Safe Drinking Water Hong Kong enjoys one of the safest water supplies in the world. The quality of the water conforms both chemically and bacteriologic ally to the Guidelines for Drinking-water Quality recommended by the World Health Organization. Water Supplies Department is committed to supply the public with water that is clear, odorless, wholesome and free from pathogenic bacteria. With proper treatment and stringent quality monitoring and control, Hong Kong is assured of a safe and wholesome water supply which complies with the World Health Organization Guidelines for Drinking- water Quality.

Water Quality Control In the treatment process, the water quality throughout the supply system is continuously monitored by professionally qualified chemists under the Water Science Division of the Water Supplies Department through a series of physical, chemical, bacteriological, limn logical, biological and radiological examinations. Samples are regularly taken at intakes, storage reservoirs, treatment works, service reservoirs, trunk- mains and consumers' taps to ensure that the water quality complies with the WHO guidelines. More than water samples are taken and tested each year.

Water Infrastructure Main Water Treatment Plants Sha Tin Pak Kong Au Tau Tsuen Wan Tuen Mun Tai Po Yau Kom Tau Ma On Shan Ngau Tam Mei Pumping Stations Muk Wu No.2 & No. 3 Tai Po Tau, Tai Po Tau No.2, No.3 & No.4 Tai Mei Tuk & Tai Mei Tuk No.2 Harbour Island

I Hope You Enjoyed It….