Views: 2 Author: Site Editor Publish Time: 2017-05-08 Origin: Site
Water treatment involves the removal of contaminants present in the raw or partly treated water. The major cause of water pollution are microbes, dissolved chemicals and other particulate matter, which originated either naturally or through man-made sources. The objective of all water treatment methods is to remove the contaminants or at least reduce the contaminants present in the raw water. So, it is necessary to treat water before using it for drinking, irrigation or other purposes. There are several water treatment methods, each of which is based on a particular technique. Some of the common water purification methods are sedimentation or settling, boiling, chemical disinfection and filtration. One of the effective types of water treatment is reverse osmosis (RO):
Reverse Osmosis (RO) systems frequently are used to reduce the levels of total dissolved solids and suspended particles within water. These systems remove variety of ions and metals as well as certain organic, inorganic and bacterial contaminants.
The advantages of reverse osmosis are no alteration in the taste and smell of water and effective removal of microbes and toxins. However, There are some contaminants not removed from water by RO systems. These include dissolved gases such as hydrogen sulfide, a common contaminant with characteristic rotten egg odor, which passes through the RO membrane; Some pesticides, solvents and other volatile organic chemicals are not completely removed by RO.
The RO membrane's efficiency in reducing the amount of contaminant in the water depends on the contaminant concentration, chemical properties of the contaminant, the membrane type and condition, and operating conditions.
No one piece of treatment equipment manages all contaminants. All treatment methods have limitations and often situations require a combination of treatment processes to effectively treat the water. Activated carbon filtration and/or sediment filtration is commonly used in conjunction with RO to help remove silt particles or chlorine that may foul the RO membrane and also remove certain pesticides and organic solvents that the RO membrane does not remove.
Because of contaminants that cause health concerns, the rejection rate needs to be high enough to reduce the contaminant to a safe level. The quality of the incoming water, or feed water, is really crucial.
Using RO is one choice for drinking water treatment. RO is an effective method to reduce ions and metals, such as nitrate and arsenic. It also can remove pesticides, organic and inorganic compounds, though it is not effective for others. It is often used in combination with activated carbon filtration. Selecting an RO system should be based on water analysis and assessment of the individual homeowner's needs and situation. Regular maintenance of the membrane and replacement of any filters are critical factors in maintaining effectiveness and reducing bacterial contamination of the system.