Water Purification:
Water conservation refers to reducing the usage of water and recycling of waste water for different purposes like cleaning, manufacturing, agriculture etc.
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Wastewater reuse or recycling systems, allowing:
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Reuse of gray water for flushing toilets or watering gardens, and Recycling of wastewater through purification at a water treatment plant. See also Wastewater - Reuse
• Rainwater harvesting
• High-efficiency clothes washers
• Weather-based irrigation controllers
Hose nozzles that shut off water when it is not being used, instead of letting a hose run. Water can also be conserved by landscaping with native plants and by changing behavior, such as shortening showers and not running the faucet while brushing teeth.
Water efficient solutions
Residential
• According to Water wise, here are some simple ways to be more water efficient at home:
• Turning off the tap while brushing teeth- a running tap can waste over six liters per minute.
• Putting a "hippo" or other displacement device into the toilet cistern.
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Fixing dripping taps. A dripping tap wastes thousands of liters of water a year.
•Using a full load in the dishwasher and washing machine. A person should be sure to buy a water efficient model when thinking of buying a new machine.
• Having a short shower instead of a bath.
• Washing fruits and vegetables in a bowl rather than under a running tap. Using the leftover
water to feed houseplants.
• Using a watering can or a hosepipe with a trigger nozzle instead of a sprinkler.
• Using a bucket and sponge when washing the car rather than a running hosepipe.
Manufacturing
According to Save water!, these are solutions useful to manufacturers:
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Identifying and eliminating wastage (such as leaks) and inefficient processes (such as continual spray devices on stop-start production lines). This may be the most low cost area for water savings, as it involves minimal capital outlay. Savings can be made through implementing procedural changes, such as cleaning plant areas with brooms rather than water.
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Changing processes and plant machinery. A retrofit of key plant equipment may increase efficiency. Alternatively, upgrades to more efficient models can be factored in to planned maintenance and replacement schedules.
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Reusing wastewater. As well as saving on mains water, this option may improve the reliability of supply, whilst reducing trade waste charges and associated environmental risks.
Waterless Products
- Using waterless car wash products to wash cars, boats, motorcycles and bicycles. This could save up to 150 gallons of water per wash.
Utilities
Here are some ideas for communities and utilities:
- Implementing a water-loss management program (e.g. locate and repair leaks).
- Utilities should strive for universal metering.
- Ensuring that fire hydrants are tamper proof.
- Equipment changes - Setting a good example by using water efficient equipment.
- Installing faucet aerators and low flow shower heads in municipal buildings.
- Replace worn out plumbing fixtures, appliances and equipment with water-saving models.
- Minimizing the water used in space cooling equipment in accordance with manufacturer's recommendations. Shut off cooling units when not needed.
Water Purification:
Water purification is the process of removing undesirable chemicals, materials, and biological contaminants from raw water. The goal is to produce water fit for a specific purpose. Most water is purified for human consumption (drinking water) but water purification may also be designed for a variety of other purposes, including meeting the requirements of medical, pharmacology, chemical and industrial applications. In general the methods used include physical process such as filtration and sedimentation, biological processes such as slow sand filters or activated sludge, chemical process such as flocculation and chlorination and the use of electromagnetic radiation such as ultraviolet light.
The purification process of water may reduce the concentration of particulate matter including suspended particles, parasites, bacteria, algae, viruses, fungi; and a range of dissolved and particulate material derived from the surfaces that water may have made contact with after falling as rain.
The standards for drinking water quality are typically set by governments or by international standards. These standards will typically set minimum and maximum concentrations of contaminants for the use that is to be made of the water.
It is not possible to tell whether water is of an appropriate quality by visual examination. Simple procedures such as boiling or the use of a household activated carbon filter are not sufficient for treating all the possible contaminants that may be present in water from an unknown source. Even natural spring water – considered safe for all practical purposes in the 1800s – must now be tested before determining what kind of treatment, if any, is needed. Chemical analysis, while expensive, is the only way to obtain the information necessary for deciding on the appropriate method of purification.
According to a 2007 World Health Organization report, 1.1 billion people lack access to an improved drinking water supply, 88% of the 4 billion annual cases of diarrhea disease are attributed to unsafe water and inadequate sanitation and hygiene, and 1.8 million people die from diarrhea diseases each year. The WHO estimates that 94% of these diarrhea cases are preventable through modifications to the environment, including access to safe water. Simple techniques for treating water at home, such as chlorination, filters, and solar disinfection, and storing it in safe containers could save a huge number of lives each year.
.Treatment Process and Methods:
2.1 Pre-treatment
2.1.1 pH adjustment
2.2 Flocculation
2.3 Sedimentation
2.4 Filtration
2.4.1 Slow sand filters
2.4.2 Lava filters
2.4.3 Removal of ions and other dissolved substances
2.4.4 Other mechanical and biological techniques
2.5 Disinfection
2.5.1 Chlorine disinfection
2.5.2 Ozone disinfection
2.5.3 Ultraviolet disinfection
2.5.4 Hydrogen peroxide disinfection
2.5.5 Various portable methods of disinfection
2.5.6 Solar water disinfection
2.6 Additional treatment options
3 Other water purification techniques
4 Hydrogen productions
5 Safety and controversies
5.1 Dematerialized of water
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