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All 10 Critical Steps Needed For Water Purification

Jul 21, 2008
This article explains in brief the methods of water purification needed in order for us to be drinking, cooking and bathing with the purest water that we can. However it also holds a warning to help people understand the importance of water filtration.

When either surface water from lakes, reservoirs or rivers or ground water pumped from wells is taken to the water treatment plants a method of water purification - pre-filtration system of softening the water is already in process.

This is the process where the particles are removed from the water and depending upon which molecules and contaminants they are and also the size of them depends on which filtration method is used. It can be either one or a combination of: screens, sand filtration, cross flow filtration one system of that is reverse osmosis; or cartridge filtration. It also depends on the cost involved and what the water is needed for.

If water is used for home purposes then the standards have to be a lot more stringent.

Chemical Water Purifying
This process involves the addition of various chemicals to prevent the water from hardening after deposits of ions such as magnesium have been added or for a neutralizing process.

Clarification is when the fluid is separated from the solid particles. This process is used alongside flocculation which makes the particles sink faster to the bottom of the tank and the liquid is taken from the top where there are no contaminants. Thickening on the other hand is the same as clarification only done in reverse.

Lenntech tell us that this is a process of ion exchange where an ions such as magnesium and calcium are replaced with other charged ions like sodium in order to keep the water soft. However, we do need the minerals from calcium and magnesium for our health as well.

It is very important once the water has been partially treated that it is disinfected to kill any bacteria that may still exist. The main disinfectants used in water treatment are chlorine, chlorine dioxide and ozone.

This is fine but has to be monitored very closely. Once the water leaves the plant however, it could still become infected with chlorine by-products and so even though it has gone through this process when it reaches our taps it may not be safe. This is why we need to re-filtrate the water before we use it.

This process is achieved after boiling water and vapourizing. Because most contaminants cannot be vapourized the water will pass into the condensate and the contaminants and pollutants left behind in the evaporation unit such as a kettle.

Electro Dialysis
Because a lot of the impurities and contaminants are ionized or in an electrically charged state the best way of removing them is to apply an electrical current and let the impurities migrate towards the negative electrodes. It uses permeable membranes to achieve like other filtration methods that we have already mentioned - reverse osmosis is one of them.

pH Adjustment
The main purpose of balancing the pH is to prevent the corrosion of lead pipes infecting the water and the deposits of lead as this can be very dangerous and some properties still have lead pipes leading to the point of entry in their homes.
This sounds a bit like what dogs do does not it. But in this respect it is to collect the slightly organic contaminants in a base of resin. Once the organic matter has filled the resin it is then regenerated with a high concentration of sodium chloride. According to Lenntech.

Biological Water Treatment
The biological treatment of water is based on the natural self-purification capacity of natural waters. Also slow sand filters can act as fixed-bed bio-reactors (Wickins and Helm, 1981).

If as noted earlier municipal water treatment plants are not hitting the standards to bring us the purest water they can we have to ask ourselves - What then is really left floating around in our water?

Do something about it today and save yourself the worry of whether or not your water is safe. Think about using some method of water purification system in the home and give you and your family total peace of mind.
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