ABSTRACT
In this study, the optimal process conditions for the treatment of simulated amoxicillin wastewater by Fe/Cu micro-electrolysis systems were preliminarily determined through batch experiments. According to the optimal process conditions, the effects of Fe particle size and shape on COD removal rate and kinetics were also discussed. The experimental results showed that the optimal process conditions were as follows: the electrode material dosage was 45g/L, the initial pH was 3, and the reaction temperature was 293K. The micro-electrolysis systems with smaller-size particles and spherical particles had greater COD removal rates. The COD removal of the micro-electrolysis system constructed with different size particles was more preferably matched to the pseudo-second-order kinetic model, and their dominant speed-controlling steps were liquid film diffusion. The COD removal of micro-electrolysis systems with flaky and irregular particles was more in accordance with the pseudo-first-order kinetic model, while the COD removal of micro-electrolysis systems with columnar and spherical particles could be better described by the pseudo-second-order kinetic model. The main speed-controlling steps of micro-electrolysis systems constructed with different shape particles were chemical reaction (flaky particles), liquid film diffusion (columnar particles), liquid film diffusion/chemical reaction (irregular particles), and liquid film Diffusion (spherical particles), respectively.
