Sulfidized Nanoscale Zerovalent Iron Modified Pitaya Peel Derived Carbon for Enrofloxacin Degradation and Swine Wastewater Treatment : Combination of Electro-Fenton and Bio-Electro-Fenton Process

In this study, a new fenton system combined with electro-fenton and bio-eletro-fenton (EF-BEF system) was proposed for the ENR degradation and swine wastewater treatment, and the pitaya peel derived carbon modified by sulfidized nanoscale zerovalent iron (SnZVI) was developed as catalyst of the system. The as-prepared PPC-800 carbon displayed a hierarchical porous structure with high specific surface area, abundant oxygen containing groups and carbon defects, which endowed it with a good adsorption capacity, high H2O2 generation capacity (151.9 ± 10.5 mg/L) in the EF period and good power production performance (194.3 ± 12.50 mW/m2) in the BEF period. When modified with SnZVI, the SnZVI@PPC-2 showed the best ENR removal performance with that of 98.9 ± 0.2 % in the EF period and 86.2 ± 5.6 % in the BEF period respectively. The increase of current intensity and air flow rate would promote the ENR degradation. Finally, swine wastewater was treated by the SnZVI@PPC-2 EF-BEF system, with the bioanode for the containing biodegradable organics and the EF and BEF for the deep treatment of the remaining refractory organics. 97.9 ± 1.3 % of the TOC in the swine wastewater could be removed by the combined system