AWWA MTC69659

Nitrate and perchlorate in drinking water sources are of major health concerns because theycan cause adverse health effects on human and ecosystems. While it is technically possible totreat nitrate and perchlorate in water supplies, it can be difficult, expensive and not totallyeffective.This work evaluates the feasibility of new membrane hybrid systems for the removal ofnitrate and perchlorate from drinking water. This hybrid system combines low pressurereverse osmosis (LPRO) and ion exchange membranes (IEM) to achieve high recovery ofpermeate flow and low energy consumption. Different configurations of hybrid systems werecompared to find out the optimum process configuration.The study carried out experiments using a laboratory-scale IEM device and pilot-scale ROequipment. Four kinds of ion exchange membranes were compared based on membranetransport analysis. A spiral wound LPRO membrane was used for RO filtration test.Membrane transport studies showed that IEM is suitable for obtaining water withconcentrations of nitrate below the recommended levels. LPRO could reject 80%-95% ofnitrate even at transmembrane pressure below 800 kPa. The optimum combination of IEMand LPRO is likely to be effective for high removal efficiency of nitrate with low energyconsumption. Includes 8 references, tables, figures.

Product Details

Edition:

Vol. - No.

Published:

11/01/2009

Number of Pages:

10

File Size:

1 file , 920 KB