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Technological Optimization for H2O2 Electrosynthesis and Economic Evaluation on Electro-Fenton for Treating Refractory Organic Wastewater
journal contribution
posted on 2020-05-22, 18:35 authored by Jianshe Wang, Ruirui Chen, Tianyi Zhang, Junfeng Wan, Xianglin Cheng, Jianhong Zhao, Xinhai WangThe
current efficiency (CE) of electrogeneration of H2O2 closely determines the cost of the electro-Fenton process
and is influenced by two aspects: intrinsic activity of catalysts
and application parameters. To understand how the two aspects interplay,
in this study, oxidized carbon nanotubes are screened as catalysts
and evaluated by comparing CE of H2O2 generation
on a rotating ring-disk electrode (CERRDE) and CE on a
gas diffusion electrode (CEGDE). The results show that
CEGDE is evidently larger than CERRDE, the reason
for which is ascribed to sufficient oxygen supply for the GDE, indicating
that oxygen supply is more crucial than the intrinsic activity of
catalyst. Using optimized parameters for electro-Fenton to treat simulated
rhodamine B wastewater, it is shown that the removal efficiency of
chemical oxygen demand (COD) is only 57% when rhodamine B is degraded
by 99% and completely removing COD would cause much higher energy
consumption. Therefore, electro-Fenton is only employed to pretreating
refractory wastewater for enhancing the biodegradability. Tests with
three types of wastewater confirm the general applicability of enhancing
the biodegradability using short-time electro-Fenton treatment.