AI Article Synopsis
- A study was conducted on removing high-concentration rhodamine B (RhB) wastewater using a three-dimensional electrochemical reactor (3DER) with granular activated carbon electrodes.
- The optimal conditions for maximum RhB removal were found to be a voltage of 7.25 V, a pH of 5.99, an aeration rate of 151.13 mL/min, and a NaCl concentration of 0.11 mol/L, achieving a 60.13% COD removal rate with low energy consumption of 6.22 kWh/kg COD.
- The generated activated chlorine was key in breaking down carbon and nitrogen from RhB wastewater, and the treated effluent showed good biodegradability, making
Article Abstract
The removal of high-concentration rhodamine B (RhB) wastewater was investigated in a three-dimensional electrochemical reactor (3DER) packed with granular activated carbon (GAC) particle electrodes. Response surface methodology (RSM) coupled with grey relational analysis (GRA) was used to evaluate the effects of voltage, initial pH, aeration rate and NaCl dosage on RhB removal and energy consumption of the 3DER. The optimal conditions were determined as voltage 7.25 V, pH 5.99, aeration rate 151.13 mL/min, and NaCl concentration 0.11 mol/L. After 30 min electrolysis, COD removal rate could arrive at 60.13% with an extremely low energy consumption of 6.22 kWh/kg COD. The voltage and NaCl were demonstrated to be the most significant factors affecting the COD removal and energy consumption of 3DER. The intermediates generated during the treatment process were identified and the possible degradation pathway of RhB was proposed. It is worth noting that 3DER also showed an excellent performance in total nitrogen (TN) removal under the optimal condition. The activated chlorine generated from chloride had great contributions to eliminate carbon and nitrogen of RhB wastewater. The treatment effluent had a good biodegradability, which was suitable for subsequent biological treatment.
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| http://dx.doi.org/10.1016/j.jenvman.2018.04.071 | DOI Listing |
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