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New Process for Improved Radium Removal from Contaminated Drinking Water

ItN Nanovation AG developed and successfully tested a new, improved process called Cer@Sorp for removing radium from contaminated drinking water – a problem in Middle-east countries.

The new development is based on the conventional solution for sand filters and polymer membranes. In addition, it uses the possibilities and process advantages of ItN’s flat sheet membranes, the company´s core product. Thanks to the combination of chemical pretreatment and targeted cake-layer filtration, which is only possible with ItN’s ceramic flat sheet membranes, the radium removal rates were successfully raised to up to 98 %. These are results previously only achieved by very expensive filtration processes with reverse osmosis. Sand filters and polymer membranes do not allow a targeted growth of cake layer during filtration. In the previously applied conventional process chemicals had to be dosed via inefficient dosing systems, making high demands on the construction side and requiring high overdosing of chemicals in order to achieve radium removal rates of 80 %. The new combination of chemical process and ceramic flat membranes does not only offer cost advantages to the operators of waterworks with regard to construction and operation of the plant, it increases water quality to such an extent that may make costly and complex post-treatment – such as reverse osmosis – redundant. Cer@Sorp enables the use of wells, whose water quality until now did not permit their use as sources of drinking water.

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