The water treatment plant is a vital part of the community. It is responsible for ensuring that the water supplied to the homes and businesses in the area is clean and safe to drink.
The plant uses a variety of methods to treat the water, including filtration, chlorination, and ozonation.
Introduction: What is a water treatment plant?
Water treatment plants play a vital role in our society. They clean the water we drink and use it for other purposes. Without them, we would be susceptible to many diseases. The first water treatment plant was built in 1878 by John Snow.
- A water treatment plant is an important part of any community.
- It is responsible for treating the water that comes in from the local water sources.
- This water is then used for a variety of purposes, from drinking to irrigation.
- It is important to have a reliable and effective water treatment plant to ensure that the community has access to clean water.
Types of water treatment plants
There are various types of water treatment plants, which use different processes to clean and disinfect water. The most common type of water treatment plant is the activated sludge plant. This type of plant uses a process called activated sludge to clean the water.
In the activated sludge, bacteria break down the organic material in the water, and then the bacteria are killed with chlorine. Other types of water treatment plants include:
- The membrane bioreactor (MBR) is a type of advanced water treatment plant that uses membranes to purify the water.
- The reverse osmosis (RO) plant uses membranes to remove salt and other impurities from the water.
- The sand filter plant uses a process called slow sand filtration to clean the water.
- The ultraviolet (UV) light plant uses UV light to kill bacteria in the water.
How water treatment plants work
Water treatment plants work by first removing large debris from the water. This is done by a device called a bar screen. The bar screen has bars that catch large pieces of debris like sticks, leaves, and trash.
After the large debris is removed, the water is treated with chemicals to kill bacteria and other organisms. The water is then cleaned and filtered before it is released back into the environment.
PRESSURE SAND FILTER:-
The pressure sand filter consists of a pressure vessel either vertical or horizontal, with a set of frontal pipework and valves, graded silica quartz sand supported by layers of graded underbed consisting of pebbles and gravels, a top distributor to distribute the incoming water uniformly throughout the cross-section of the filter, and an underdrain system to uniformly collect the filtered water.
Raw water flows downwards through the filter bed and the suspended matter, which is treated by the addition of a coagulant like alum or polyelectrolyte, is retained on the sand surface and between the sand grains immediately below the surface.
There is a steady rise in the loss of head over a while and the flow reduces once the pressure drop across the filter is excessive. The filter is then taken out of service and cleaning of the filter media is affected by flow reversal also called backwash.
USES:
To remove total suspended solids and organic matter from effluents following secondary treatment.
ACTIVATED CARBON FILTER:-
The outlet of PSF enters into the ACF filter. The Activated Carbon filter consists of a pressure vessel either vertical or horizontal, with a set of frontal pipework and valves, Activated carbon granules supported by layers of graded underbed consisting of pebbles and gravels, a top distributor to distribute the incoming water uniformly throughout the cross-section of the filter, and an underdrain system to uniformly collect the filtered water.
Due to its high degree of microporosity, activated carbons provide a huge surface area. An activated carbon filter operates through adsorption. Adsorption is proportional to the surface area of the medium. This large surface area provides a large adsorption area for organic and chlorine molecules to attach to.
USES:
To remove free chlorine, organic matter, odour, and Colour present in the raw water and wastewater.
DISINFECTION
Ultra Violet:
We pass the outlet of the ACF vessel through UV for the disinfection process. In UV water disinfection technology, we use ultraviolet light to disinfect bacteria, viruses, moulds, algae, and other microorganisms that multiply and grow.
UV disinfection technology kills microorganisms by destroying their DNA, rendering them inactive and unable to reproduce.
EXCESS SLUDGE REMOVAL:
We collect the excess sludge generated in a separate tank called the aerobic digester / Sludge Holding tank. We further digest and thicken the sludge there. The thickened sludge is fed into the Filter press through a Screw pump at High pressure and taken out as cakes from the Filter Press.
If you intend to use dewatered sludge as compost, you don’t need to further dewater it; you can use the moist sludge directly as an ingredient.
Advantages and disadvantages of water treatment plants
Water treatment plants are a vital part of keeping our water clean and safe. They remove pollutants and contaminants from our water supply, making it drinkable and usable for many purposes. However, water treatment plants also have some disadvantages.
The first disadvantage of water treatment plants is their cost. They are expensive to build and operate, and the taxpayer often foots the bill. Additionally, the process of cleaning the water can be harmful to the environment, particularly if the plant uses harsh chemicals or processes such as chlorination.
Another downside to water treatment plants is that they can create “dead zones” in bodies of water. These are areas where the amount of oxygen present is so low that no life can survive.
The plant’s discharge pipes can cause this by releasing pollutants into the water, or algae blooms can form as a result of the plant’s operations.
Conclusion
The Clean Water Act regulates water treatment plant effluent discharges. The plant must meet the National Pollutant Discharge Elimination System permit requirements for effluent discharge. The permit sets limits on the number of pollutants that can be discharged from the plant.
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