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Carbon-neutral operation of wastewater treatment plants (WWTPs) requires enhancing anaerobic digestion (AD) of excess sludge for a higher energy conversion efficiency. Among others, iron has been identified to function on enhancing methane production in AD. As an industrial residual, waste iron scraps (WISs) have been reported as potentially enhancing CH4 production in AD. With this study, the mechanisms...
Methane (CH4) recovery from excess sludge plays an important role in wastewater treatment aimed at achieving carbon neutrality. Besides pretreatment for excess sludge, exogenous CO2 and even H2 have already been tested in enhancing CH4 production from anaerobic digestion (AD). However, exogenous H2 injected into AD might simultaneously influence both upstream acidogenesis and downstream methanogenesis...
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