AWC RO biocides have been specifically selected for use with RO/NF membranes. Our product line includes oxidizing and non-oxidizing biocides that are selected based on water quality and frequency of biological fouling.
Nanofiltration & Reverse Osmosis: RO Membrane AntiscalantRO systems use crossflow membrane filtration, where the water that is not purified exits the system as a concentrated brine. As water passes to the permeate side, the unpurified fraction of the water is left with all the salts, organics and colloidal particles that are rejected by the membrane. The higher the operating recovery, the more concentrated the brine will be. When dissolved salts in the brine exceed saturation, they begin to precipitate as scales. Likewise, organics and colloidal particles have a higher fouling potential as they become more concentrated along the length of the membrane system. AWC has developed highly effective inhibitors that eliminate the most challenging scales and significantly reduce colloidal and organic fouling in reverse osmosis (RO) and nanofiltration (NF) membrane systems. All AWC antiscalants are NSF approved for use in potable membrane systems. Our antiscalants are highly effective for all feedwater sources, including groundwater, wastewater, fresh surface water, seawater, and municipal water. Our high-performance reverse osmosis (RO) antiscalants are effective at remarkably low dosages and can inhibit scales even at very high saturations. The use of AWC antiscalants can eliminate the need for acid dosing, enable plants to operate at higher recoveries, and reduce cleaning frequencies. AWC RO antiscalants control scales such as calcium carbonate, calcium phosphate, calcium sulfate, barium sulfate, strontium sulfate, calcium fluoride, iron hydroxide, iron phosphate, silica, and colloidal foulants. Our RO antifoulants disperse colloidal silica and natural organic matter.
Multimedia Filtration (MMF) is often used upstream of RO/NF to remove suspended solids that can cause plugging of membrane feed channels and damage the membrane surface. However, MMF media is only efficient at removing particles larger than 20 – 50 microns. AWC has developed a line of membrane compatible organic and inorganic coagulants that agglomerate smaller silts, clays and colloids into larger clusters that are more efficiently filterable. All polymers have been tested extensively to ensure safe use with RO/NF membranes even in case of slight overdosing.
AWC's membrane cleaning chemicals are highly effective for removing even the most stubborn scales and foulants from RO/NF membranes. Our membrane cleaning chemicals are formulated for all types of RO membrane systems, ranging from those used in Food and Beverage applications to Water Reuse applications.
The outcome of a membrane cleaning is equally dependent on procedure as it is on the quality of the cleaning chemical. However, an optimal procedure isn’t always possible to implement due to limitations in the design of the Clean-In-Place (CIP) system. AWC can provide recommendations on CIP system design, and can provide training on best practices and procedures to enhance RO membrane cleaning results and to reduce frequency of CIP’s. Additionally, we offer cleaning studies that allow us to identify the optimal temperature, pH and cleaning time for the membrane foulant in your specific system.
High pH and low pH chemicals are available in both liquid and powder form.
All of AWC's cleaning chemicals are NSF approved for use in potable membrane systems.
AWC dechlorination chemicals have been specially formulated for long term shelf-life and are odor-free. In addition to neutralizing free and combined chlorine to protect RO/NF membranes, they also deactivate all other oxidizing and non-oxidizing biocides; this makes them essential tools for environmental discharge.