Blog – articles about water treatment and more
FreeFlow GREEN - the green antiscalant
Modern antiscalants are subject to the DIN EN 15039 standard for polycarboxylic acids and the DIN EN 15040 standard for phosphonic acids when it comes to their use in the treatment of drinking water by membrane systems.
In addition to the requirements for drinking water production, another requirement profile for the antiscalant can be its biodegradability.
History of Reverse Osmosis
The natural process known as osmosis was first discovered back in 1748 by Jean-Antoine Nollet, a French clergyman and physicist. In his experiments, Nollet used a pig’s bladder as a membrane to show that solvent molecules from low solute water could flow through the bladder wall into a higher solute concentration made of alcohol. Thus, he became the first person to demonstrate the process by which a solvent can pass selectively through a semi-permeable membrane through the process of natural osmotic pressure.
Antiscalants - history and mode of action
The first commercial membranes were made of cellulose acetate. An acidic pH in the feed prevented the membranes from degrading. The acidic pH also prevented calcium carbonate deposits in the concentrate.
Water treatment with (reverse) osmosis plants
Reverse osmosis is a physical process of membrane technology for the concentration of substances dissolved in liquids, in which pressure is used to reverse the natural osmosis process.