TITLE: Use of electrolytic processes applied as an alternative treatment to chlorine in water pretreatment in reverse osmosis system.

author(s): Rodrigues, Y.B.R.E.S., Cruz, T.M.C., Baroni, E.B.S. & Hernandez, R.P.B.H.

ABSTRACT: Reverse osmosis filtration is one of the water treatments used by industry because it is  very effective in removing dissolved salts from water since it uses a specific type of thin, semi permeable membrane. These membranes have characteristically small pores to allow the passage  of pure water and reject larger molecules, such as ions and other tiny impurities like bacteria and  viruses. Several precautions need to be considered in water treatment before starting the  filtration process in the equipment. These precautions are necessary to avoid premature loss of  the membranes in the reverse osmosis system equipment. One of the most common problems  that cause this damage is the oxidation reaction of the polyamide layer by the chlorine-based  disinfectant, which corrodes this layer, substantially decreasing its filtration properties. The  objective of this study, therefore, was to verify the possibility of substituting the use of chlorine  in water treatment, for the removal of microorganisms, by the passage of an electric current, reducing the probability of biofilm formation and membrane perforation. The methodology  consisted of experimental research, to verify the efficiency of the electric current as a biocide in  a sample of raw water with cultivated microorganisms. An electrical load of 24 volts was  applied, varying the exposure time, using Copper and Stainless Steel 304 as electrodes. The final  results showed that in the treatment with the copper electrode and 30-minute retention of the  water the results were satisfactory, and the treatment, therefore, could be used in conjunction  with other biocides or in isolation reaching up to 10^3 CFU/ml of Aerobic Bacteria in the feed  water.

KEYWORDS: Microorganisms; Biofilm, Electric Current, Polyamide, Reverse Osmosis.

CITATION: Rodrigues, Y. B. R. E. S. et al. Use of electrolytic processes applied as an alternative treatment to chlorine in water pretreatment in reverse osmosis system. The Academic Society Journal, 5(4) 177-189, 2021. DOI: doi.org/10.32640/tasj.2022.4.177.