Abstract
Coal fly ash (CFA), corn straw, and pharmaceutical wastewater are typical solid and liquid wastes. In this study, activated carbon (CSAC) was first produced by carbonising corn straw, and then a particle electrode with Fenton-like catalytic performance (Fe/CFA-CSAC) was prepared and used in a three-dimensional electro-Fenton process (Fe/CFA-CSAC EF process) to treat ofloxacin-simulated wastewater (OSW). Fe/CFA-CSAC was first characterised using SEM+EDX, XRF, BET test, and XRD, and then the critical treatment parameters of OSW were optimised (T = 30 °C, aeration rate = 3 L/min, current density = 12 mA/cm2). The catalytic oxidation process was critical in the degradation of ofloxacin, while the adsorption process played an auxiliary role. The water quality had a significant improvement, 63.6 % of COD and 51.4 % of TOC were eliminated, BOD5/COD was increased from 0.12 to 0.44, and the toxic inhibition rate was reduced by 40.8 %. Fe/CFA-CSAC EF process can effectively work in a wide pH range (2.0–9.0) and can be used at least 25 cycles. The material costs required for the preparation of Fe/CFA-CSAC was $219.9/ton and the treatment cost of OSW was $1.71/ton. Finally, the working mechanism of Fe/CFA-CSAC was proposed.
Published Version
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