www.edie.net has recently published an article on water companies testing electrolysis using green electricity to make hydrogen from sewage while cleaning the water. Recent criticisms of the big monopoly water companies regularly releasing sewage into rivers certainly need answering, and the target of 20GW for UK green hydrogen by 2020 may incentivise this innovative way forward. Severn Trent in 2021 started to examine the benefits of carbon fibre mats to replace the more common graphite electrodes, following a patent from Warwick University. Tests at Severn Trent’s largest sewage processing plant at Minworth indicated that the innovative electrolysers did work, removing 51% of organic pollutants and up to 100% of suspended solids while producing 18 times more hydrogen than the standard design.
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