A pilot scale of electrochemical integrated treatment technology and equipment driven by solar energy for decentralized domestic sewage treatment.

Based on the natural air diffusion electrode (NADE) cathode, a solar-driven electrochemical integrated sewage treatment technology and equipment in a pilot scale was developed to treat dispersed rural wastewater. The non-aeration NADE had efficient and stable H 2 O 2 production performance, maintaining the H 2 O 2 output between 1474 and 1535 mg h−1 within 50 h with the current efficiency of 77.4%–80.6%. This electrochemical integrated wastewater treatment system was coupled with technologies such as dual-cathode electro-Fenton, peroxi-coagulation and photoelectro-Fenton, which effectively improved the conversion and utilization efficiency of H 2 O 2. It integrated Fenton-like oxidation, electro-oxidation and UV/H 2 O 2 , as well as Fe(OH) 3 -dominated flocculation, which could effectively remove various pollutants in wastewater. The integrated sewage treatment equipment (500 L d−1) realized the effective treatment of a rural decentralized domestic sewage, achieving simultaneous removal of chemical oxygen demand (COD), NH 3 –N, total phosphorus (TP) and bacteria. Driven by solar energy, its application feasibility, superiority and stability have been proved, providing theoretical and technical support for the efficient and low-consumption treatment of dispersed organic wastewater. [Display omitted] • Electrochemical integrated treatment equipment driven by solar energy is proposed. • The non-aeration NADE had efficient and stable H 2 O 2 production performance. • It integrates electro-oxidation, peroxi-coagulation and photoelectron-Fenton. • It has been successfully applied to the treatment of rural decentralized domestic sewage. • The pilot scale system exhibits good application feasibility, superiority and stability. [ABSTRACT FROM AUTHOR]