Effect of hydraulic retention time and substrate availability in denitrifying bioelectrochemical systems

This study evaluates denitrifying bioelectrochemical systems (BES) for nitrate removal in low-carbon waters using a novel tubular reactor design. By systematically varying hydraulic retention time (HRT) from 10.89 to 0.46 hours and influent nitrate concentration, the authors demonstrate that decreasing HRT significantly enhances nitrate removal rates up to 849 g N mNCC⁻³ d⁻¹ without nitrite accumulation. Results indicate HRT is the dominant operational parameter, with implications for compact reactor scaling strategies.

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