THE EU limits the nitrate content of drinking water to 50 mg/lto avoid blue baby syndrome.Ion exchange columns do the trick,but their large footprint and complex sequencing of many valves make them a pain to operate.Anglian Water found that the plants need a lot of resin and,operating in a hard water area,calcify waste stream equipment.With Biwater Treatment,Anglian chose PuriTech's new technology(see below).Amongst other advantages,a waste stream of 0.5% throughput looked very attractive.
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