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ASSIGNMENT – 2 WATER TREATMENT PLANT COMPARISON

Corbalis Water Treatment Plant Video by Fairfax Water Video Title: Corbalis Water Treatment Plant Tour

BRIEF DESCRIPTION ON CORBALIS WATER TREATMENT PLANT

The Corbalis water treatment plant is situated at the northern tip of the Fairfax Water Supply Area in Fairfax country near Hendon. Its foundation was laid in April 1982. The plant's water capacity has grown from 50 to 225 million gallons per day in the last two decades. This upgradation of the existing water treatment plant facility highly costs them about 158.6 million dollars. The project includes the excavation of 500,000 cubic yards of material, placement of 60,000 cubic yards of concrete, nine miles of chemical piping and 100 process mechanical tins. The plant was strategically designed to multiply as water demand increased without being taken out of service and with minimal disruption to the community. The most recent expansion completed in 2008 included plant enhancements, such as a new computer-automated control system, changes to the plant's electrical system, changes to the ozone production and application system, and transition from gaseous chlorine to liquid sodium hypochlorite disinfection. Fairfax Water will meet expected consumer demand by 2025 by expanding the Corbalis factory. It uses a six-step treatment process that ensures clean and safe drinking of its treated water. Also, the Service Authority continually monitors the water supplied to customers to ensure it remains clean, safe and of the highest quality possible. Similar unit operations:

Intake Coagulation Flocculation Sedimentation Flouridation Storage and Water distribution Differences between G.E. Booth WWTP and Typical WWTP:

Screening The process of separating the larger objects like bloom, algae, plants, logs and preventing them from entering into the water treatment plant is done by a wire mesh of fishnet size pores which allows only water to pass through it. This is done in a different way mechanically by the travelling protective bar screen. As the wire mesh contains very small pores thus preventing majority of contaminats to pass through it as so leaves the water with almost negligible impurities so it preferred in Corbalis water treatment plant while in the travelling screen moves around water and takes out only the larger objects like logs but the small plants and blooms are unable to be trapped by the the travelling screen as so some of the impurities might left in the water.

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In typical WWTP the pre-chlorination process is being used to kill the majority of germs present in water and ozonation for killing the remaining minority of germs while in G.E. Booth WWTP the majority of germs and poisons present in the water are neutralised with the help of ozonation process not by pre chlorination process. The ozonation is more essential process than pre chlorination as by the help of ozone addition process not only germs are killed but also removes and neutralises the affect of pharmaceuticals and personal care products present in the water. As the ozonation process does not involves the usage of chemicals so it is better and an eco-friendly way of killing germs than pre-chlorination method.

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In Sand filtration takes place in typical WWTP to remove any fine solid particles which gets entered alongwith the water and are not separated by the screening process. This process is done by the GAC that is granulated activated carbon which is contained in the sand filters but the filtration is done with anthracite contained in the sand filters. As the activated carbon which have greater surface area adsorbs more of the pollutants on its surface and moreover it also takes out organic harmful chemicals that are present in the water so it involves physical process of solid and chemical impurities separation so it is better than anthracite which only separates the solid impurities used in the typiacal water treatment plant.

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Low lift and high lift pumps are used for intake and discharge of water in typical WWTP while the diffusers are being used for same purpose in G.E. Booth WWTP because the pumps need more input of electric supply but diffusers need lesser input of electricity and gives greater work output than pumps. Also, the diffusers are long lasting and proper functioning than pumps.

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In disinfection method, sodium hypochlorite is added to water in case of G.E. Booth WWTP while smaller amount of chlorine is being used as a disinfectant to be added to water. Sodium hypochlorite has no effect on quality of water and public health but smaller amount of chlorine makes the water odorous and so decreases the quality of water and there are also many health hazards associated with it so sodium hypochlorite is preferred in G.E. Booth WWTP.

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Corrosion inhibitor addition These are also added along with the chlorine and fluoride as the corrosion inhibitors like tin sulphate and sodium silicate are used. These prevent the leaching of lead from the household plumbing from getting into the water as the leaching of lead can reduce the quality of water and might increase the rate of diseases. While in typical water treatment plant only clorine and fluoride are added in water and no such process takes place.

REFERENCES  Corbalis water treatment plant. https://www.pwcsa.org/what-we-do/treatment-process-0 ( accessed July 12, 2020)  Typical water treatment plant. Drinking water treatment. https://slate.sheridancollege.ca/d2l/le/content/711128/viewContent/9394072/View ( accessed July 12, 2020)

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Video link: https://youtu.be/oD7qsmzub-w ( accessed July 12, 2020)...