Utilization of Supported Liquid Membrane Technique. Removal of Chemical Species from Industrial Waste Effluents

A dolphin's echolocation is usually good enough for it to find a small ring on the sea bed, so things must be pretty serious if it can't tell that it's about to be brained by a boat. `Then, of course, there's all the sewage, the chemical and industrial waste and artificial fertiliser that's being washed into the Yangtze, poisoning the water and poisoning the fish.' `So,' I said, 'what do you do if you are either half-blind, or half-deaf, living in a discotheque with a stroboscopic light show, where the sewers are overflowing, the ceiling and the fans keep crashing on your head and the food is bad?' 'I think I'd complain to the management.' 'They can't.' 'No. They have to wait for the management to notice.' A little later I suggested that, as representatives of the management so to speak, perhaps we ought to try to hear what the Yangtze actually sounded like under the surface - to record it in fact. Unfortunately, since we'd only just thought of it, we didn't have an underwater microphone with us. 'Well, there's one thing we can do,' said Chris. 'There's a standard technique in the BBC for waterproofing a microphone in an emergency ...»