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Preservation of reverse osmosis membranes with non oxidizing biocides – comparison with SMBS

  Sodium metabisulphite ( SMBS ) is the current standard preservation chemical used in RO plants during the shutdown. It is a cheap and efficient preservative, but its tendency to oxidize easily has several drawbacks. The use of a non-oxidizing biocide instead could solve some of the issues currently seen with the SMBS , but little has been reported about membrane compatibility and preservation efficiency in the long-term mode. Long-term membrane preservation trials have been executed with three different non-oxidizing biocides: DBNPA (2,2-dibromo-3-nitrilopropionamide), CMIT/MIT (5-chloro-2-methyl-4-isothiazolin-3-one (CMIT) and 2-methyl-4-isothiazolin-3-one (MIT), OIT (2-octyl-2H-isothiazol-3-one) as well as SMBS as the reference chemical. The suitability of these chemicals in this application was confirmed using both new Brackish Water Reverse Osmosis (BWRO) and used membranes with various membrane chemistries (Nanofiltration (NF), BWRO, Sea Water Reverse Osmosis (SWRO)) . The pres
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RO Biocides - Acuro Organics Limited

Biocide Technical Guide Biofilm consists of microorganisms contained in a matrix of hydrated extracellular polymeric substances. In most biofilms, the microorganisms account for less than 10 percent of the dry mass, with the balance consisting of inorganic ions and extracellular material. Figure 1 is an SEM image of a biofouled reverse osmosis (RO) membrane showing numerous bacilli imbedded in an organic matrix1. Compared to cellulose acetate, the main disadvantage of polyamide membranes is their intolerance to chlorine and other oxidants. This disadvantage often leads to biofouling of membrane surfaces and feed passages, which can significantly reduce system performance. BIOFOULING CONTROL There are five strategies for controlling biofouling in polyamide reverse osmosis (RO) systems: • Use of non-oxidizing biocides • Chloramine addition • Ultraviolet light sterilization • Chlorination/dechlorination • Cleaning NON-OXIDIZING BIOCIDES The primary non-oxidizing biocides used today are d
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Reverse Osmosis Membrane Biocides & Disinfectants

Reverse Osmosis Biocides    - Non-oxidizing, non-ionic biocides can be used either online or as part of a cleaning program to control biofouling in  reverse osmosis (RO)  membranes. When used as an online treatment, the biocide should be dosed prior to the   RO   system to control bio-growth in the membranes. Application frequency of any selected biocide will normally depend on biological loading and biofilm growth rate. The program should be used to control differential pressures in the  RO  plant to reduce cleaning frequency. Application rates and frequency of application (biocide program costs vs. effectiveness)  vs. reduction in cleaning frequency, downtime, membrane life (operating costs without biocide program) should be balanced to determine the most cost-effective biocide dosing frequency. Dosing biocide further back in the pre-treatment will help control bio-growth but will also greatly increase demand and application costs. The main goal of an effective biocide program is to
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Non-Oxidizing Biological Control Chemicals

  Reduce bacterial growth and slime with advanced non-oxidizing biocides Reverse osmosis (RO) systems are favorable environments for microorganisms to thrive. Acuro Organics Limited - RO Biocides * products are non-oxidizing biocides that are highly effective in reducing bacterial growth and the build-up of slime on a variety of membrane types. BioMate membrane biological control (MBC) products are EPA registered non-oxidizing biocide for sanitizing RO and ultrafiltration (UF) systems and membranes. Most effective as bactericides, they will also control fungi and algae when used at higher dosages. A treatment program using products from both BioMate and Kleen* will result in more effective membrane cleaning and decreased cleaning frequency. Featured Products BioMate* Biocides for Membrane Systems BioMate membrane biological control (MBC) products are EPA registered non-oxidizing biocides for sanitizing RO, ultrafiltration (UF) systems and other membranes. Most effective as bacteri
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RO Membrane Biocide - Acuro Organics Limited

MICROBIOCIDE FOR REVERSE OSMOSIS INSTALLATIONS Effective against bacteria. Prevents biological fouling. High permeate quality and production. Effective at low concentrations. Easy to apply and use. Description RO MEMBRANE BIOCIDE is a control agent against bacteria for use on membranes and related installations. It is based on iso-thiazolins and is non-ionic and non-oxidising. RO MEMBRANE BIOCIDE is to prevent biological fouling of reverse osmosis installations. Application RO MEMBRANE BIOCIDE is a membrane and general-purpose micro biocide, effective at low concentrations, used to sanitize reverse osmosis and ultrafiltration systems and membranes. It can be used with cleaners to remove bio-fouling from membrane surfaces, filter media, and pipe-work. RO MEMBRANE BIOCIDE  may also be used as a storage preservative for certain types of membrane. Use and Dosing RO MEMBRANE BIOCIDE may be applied in one of two ways. It may be intermittently fed to the feedwater of a membrane separati
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