Sustainable Treatment of Antibiotic Wastewater Using Combined Process of Microelectrolysis and Struvite Crystallization

Abstract

The aim of this study was to investigate the synergistic effects of the process of iron-carbon microelectrolysis (ICME) followed by struvite (MAP) crystallization on treating antibiotic wastewater. Characteristics of ICME effluent depended mainly on the iron to carbon mass ratio (Fe/C). The optimum reaction conditions of Fe/C ratio of 2:1 and reaction time of 90 min were observed. The ICME effluent was further treated by MAP crystallization using Na 2 HPO 4 ·12H 2 O and MgCl 2 ·6H 2 O as precipitation agents. The results showed that, the Mg 2+ /NH 4 + -N/ PO 4 3− -P molar ratio of 1:1:1 and pH 8.5, were suitable for the crystallization process, which could obtain highquality MAP containing 5.18 % N,10.23 % Mg, and 13.83 % P. Optimal total removal rate of COD and NH 4 + -N removal rate achieved 84.6 and 89.9 %, respectively. The economic evaluation of NH 4 + -N recovery by the synergistic process was also conducted, indicating that the synergistic process had the potential to benefit COD emission reduction and nitrogen recovery.

Degradation of nitrobenzene by synchronistic oxidation and reduction in an internal circulation microelectrolysis reactor

“…5(b)) both decreased with an increase in pH. This trend can be explained 2) [34,35], leading to the degradation of nitrobenzene and COD.…”

Activated persulfate by iron-carbon micro electrolysis used for refractory organics degradation in wastewater: a review

“…, resulting in a decrease in the efficiency of pollutant degradation (Lai et al 2013b;Zhang et al 2015aZhang et al , 2015b. It can be concluded that when the dose of ZVI is too high or too low, it can be detrimental to the degradation of pollutants.…”