Comparative evaluation of tetraphosphonates and diphosphonates family as inhibitors of calcium carbonate precipitation on reverse osmosis membranes
A.P. Andrianov1, Cand. Tech. Sciences, associate professor;
M.N. Danilycheva1, graduate student;
A.N. Ignatiuk1, master’s degree student;
1 Moscow State University of Civil Engineering (National Research University)
2 Crystal Engineering, Growth & Design Laboratory, Department of Chemistry, University of Crete
Abstract. Membrane technology of reverse osmosis is widely used for natural and waste water treatment. One of the major problems in the operation of reverse osmosis facilities is deposition of sparinglysoluble salts on the membrane surface, which can be prevented by dosing inhibitors into the feed water. The article discusses the comparative inhibitory efficiency with respect to calcium carbonate precipitation of two families of organic inhibitors with two (5 compounds) and four (6 compounds) phosphonic groups with different aliphatic chain length. It was found that the inhibitor efficiency increases with elongation of the hydrocarbon chain, but the longest additives have a sharp drop in the inhibition efficiency.
Key words: reverse osmosis, desalination, scale inhibitor, antiscalant, calcium carbonate, diphosphonate, tetraphosphonate