Silver solutions used in photography pose an environmental threat if disposed off through the drainage system. Therefore, silver is generally recovered for reuse. Electrolysis, the traditional method of recycling silver, salvages only 80 per cent of it. Now, Bruno Pollet of Coventry University in the UK claims that 95 per cent of the silver can be recovered by employing ultrasound in electrolysis. Ultrasound denotes very high pitched sound waves that are beyond the audible range of human ears. Reportedly, by enhancing the chemical process in electrolysis, ultrasound can reclaim a variety of other metals like zinc, cadmium and lead used by industries.
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