Mahir Technologies Inc

Pre And Post Treatment For Reverse Osmosis Plants

Posted by Admin on March, 02, 2012

Reverse Osmosis Plants work on the principle of osmosis but in its reverse form. Using external pressure, hydraulic in this case, water is pushed through a membrane. This membrane only allows the water to pass, restricting the movement of contaminants any further. The membrane performs an important function in the RO system. For the proper functioning of the RO and efficient treatment of water, membrane needs to be in top form. A membrane may clog up over time or get covered by substances which may reduce its efficacy. Hence, the water being fed into the RO Systems needs to be pre-treated for reducing the potential load on the membrane.

Pretreatment Of Feed Water
Pretreatment of feed water is necessary step to prevent the fouling of the membrane. The various measures taken to ensure this involve getting rid of the solid contaminants in the water firstly. Cartridge filtration is carried out to remove contaminants up to a particular diameter or size. Biocides like chlorine are used to disinfect the water. Other substances dosed into the water are bio fouling inhibitors, which prevent bacteria from growing slime on the membrane walls. Acids like sulfuric acid are introduced into the water to prevent calcium carbonate scaling. In many Water Treatment Systems, scale inhibitors are used to prevent scaling. They are much more effective in inhibiting a variety of scales, compared to acids.

Post Treatment Of Water
Post treatment of water basically means getting it ready before final distribution to the users. The filtered water can still be contaminated by pathogens overlooked by the RO filtration systems. The water may also get contaminated on its way downstream after filtration. In such cases ultraviolet radiation treatment is beneficial in getting rid of the remaining ones. In many cases chlorination is also done for a secondary disinfection.

Pretreatment and post-treatment of water is necessary in a RO Water Treatment Plant. Another important need is for the membrane to be cleaned at regular intervals so as to ensure efficient performance and the long life of the membrane. Preventive Cleaning should be done consistently to prevent any permanent damage to the membrane.

This entry was posted on March, 02, 2012 at 11 : 59 am and is filed under Water Treatment Plants. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response from your own site.

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