A majority of our planet is covered with water, but most of it is not suitable for drinking. This has made companies like Novatron highly regarded for their work on desalination. With new technologies like Reverse Osmosis and nanofiltration gathering popularity, it is essential that the layman understands what they actually entail. www.usbr.gov/research/dwpr/ explains some of the latest methods to desalinate water. In this article, we focus on why the membrane process to make water potable is better than other desalination procedures.
Reverse Osmosis is a high-pressure process of desalinating water in low-temperatures. The separation procedure is used to purify water into drinkable versions for homes and business. Also known as the membrane process, it is highly popular because it is scalable. RO systems can be modularized for dwellings or used in a full-scale plant. Methods like multi-stage flash (MSF) require a high temperature to achieve the same result. Another reason the membrane process is preferred to other is the lower pressure requirement. To separate the salt from the water at the membrane interface a high driving force is needed. In Reverse Osmosis this conversion pressure can be below 600 psi.
Besides MSF and RO- conversion, membrane cell technology is another popular method of purifying drinking water. This technique makes use of nanofiltration, microfiltration, and ultra-filtration to create potable water. All three of these processes can be used along with Reverse Osmosis membranes to purify water. There are specific advantages to each of these filtration methods.
• With nanofiltration, one can even remove molecules and ions that have dissolved. The process can also control the total organic carbon level in the purified water. TOC is the maximum contamination level allowed in drinking water.
• With microfiltration, one can take care of microbes and coliforms like Giardia and Cryptosporidium. This filtration process is most commonly used along with Reverse Osmosis conversion.
• With ultra-filtration all the organic matter found the in water naturally can be removed. Powdered activated carbon is used as a pretreatment filter to ultra-filtration to give better results. This method is capable of eliminating or reducing only natural matter found in surface or lake waters.
It is not just surface or lake waters that benefit from RO treatment. Wastewater streams can also go through any of the desalination processes and be converted to treated process waters that can be used recreationally, commercially or industrially. An excellent way to reuse water would be to have dual supply lines. A smaller, thinner line dedicated to drinking water and more significant line for treated reuse water for any other purpose. No matter which of these latest technologies is used to treat water, it is vital to maintain the membrane surface using acid cleaning and backwashing. To keep the desalination process efficient, one has to regularly clean the material used in the piping and handling systems.
Water is essential. Clean water is vital to life. This makes creating better and more efficient ways of treating water imperative. A sustainable way to do is the best method.