Reverse osmosis is one of the most successful techniques for removing impurities from water, whether you work in a wastewater treatment facility or you are looking for the best filtration system for your house. The reverse osmosis technology can remove pollutants from water before it is filtered, making it ideal for use as feed water. By applying pressure to contaminated water and forcing it through a semipermeable membrane, this device works. The membrane prevents the majority of impurities from passing through, leaving you with clean, fresh drinking water.
COMMON PROBLEMS WITH LACK OF PRE-TREATMENT OF REVERSE OSMOSIS SYSTEM
1- FOULING:When your reverse osmosis system hasn't been properly treated, fouling is a very common problem. When impurities accumulate on the membrane's surface, it becomes less effective and may eventually prevent water from passing through completely. When fouling occurs in the front component of the RO system, the pressure in the entire system drops, resulting in less clean water reaching your faucet. If this issue arises, your operational costs will increase. In addition, the membrane will need to be cleaned or replaced entirely, which will cost a large amount of money. Keep in mind that even with proper application of a pretreatment solution, if some fouling will occur.
Using a pretreatment solution on a regular basis, on the other hand, will increase the membrane's lifespan and keep the system running for longer. Fouling is caused by a variety of factors, including:
1.1 Fulvic acid and other organics
1.2 Particulates such as silt, clay, or soil
1.3 Bacteria, fungi, and other microbes
2- SCALING:Scale is formed when dissolved chemicals and pollutants in water become concentrated and harden. Scaling will form on the membrane's surface, reducing system efficiency and allowing greater amounts of salt to enter through the membrane. On a RO membrane, calcium carbonate is a frequent scale that can form. Scale can be avoided by using scale inhibitors in the water supply.
3-CHEMICAL ATTACK: Composite membranes are made out of a thin coating that reacts poorly to chloramines and chlorine. These oxidizers will induce holes in your membrane, rendering your RO system unworkable. When a membrane is attacked chemically, the permeate water contains increased salt concentrations.
4- MECHANICAL ATTACK:To avoid mechanical damage, a reverse osmosis system's piping and controls should be checked on a regular basis. Mechanical damage to the membrane may occur if the system is started too frequently without first having the controls and plumbing checked. The same is true if the RO system is subjected to excessive pressure. Using variable frequency drive motors to start the high-pressure pumps can completely eliminate this problem.
REVERSE OSMOSIS PRETREATMENT SOLUTIONS
1- MULTI-MEDIA FILTRATION– This filter is made up of three layers that work together to keep fouling at bay. The heavier particles will be removed first, followed by the smaller pollutants, which will be removed by the lower layers of sand and garnet.
2- MICRO-FILTRATION –This method of filtration is excellent for removing microorganisms and colloidal debris. Fouling should be significantly minimised as a result of employing this filter.
3- SCALE INHIBITORS –These are chemicals that can be added directly to the feed water to prevent scale formation before the water enters your RO system. The inorganic compounds will become more soluble when these inhibitors are added to the water, which means they will be less likely to solidify.
4- WATER SOFTENING WITH ION EXCHANGE – Water softeners can help avoid scaling by exchanging some scale-forming ions with non-scale-forming ions.
It's recommended that you utilize a mix of these strategies to keep your reverse osmosis system in top shape and avoid the creation of fouling and scaling. Reverse osmosis systems can be quite effective at eliminating particles from the drinking water that is supplied into your home, which is why regular maintenance is so vital.