22 December 2003 00:00 [Source: ICB]Developed by Severn Trent Services in Fort Washington, Pennsylvania, US, in cooperation with Bayer Chemicals of Leverkusen, Germany, the Sorb 33 process for removal of arsenic from drinking water is to be adopted for water treatment programmes in the US.
The process currently treats around 176m litre of drinking water daily at 15 plants in the UK. The process is based on a fixed bed of iron hydroxide granules, Bayoxide E33, developed by Bayer Chemicals with finely structured surfaces in the nanorange which adsorb the arsenic. The high capacity of the particles means they do not have to be replaced as often as activated carbon or aluminium oxides.
Tom Mills, vice president of Severn Trent Services said: 'The US Environmental Protection Agency (US EPA) intends to use our technology for six of its 12 Phase I demonstration projects for removing arsenic from drinking water.'
Interest in the process has risen following a decision by the EPA to impose a threshold of ten microgram of arsenic/litre of drinking water from 2006.
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