Greywater treatment by anodic oxidation, photoelectro-Fenton and solar photoelectro-Fenton processes: Influence of relevant parameters and toxicity evolution

In this study, the applicability of factorial design to the treatment of greywater (GW) containing dodecyl-benzene sulfonic acid (LAS) by electrochemical advanced oxidation processes (EAOPs) is demonstrated. At bench scale, anodic oxidation with electrogenerated H2O2 (AO-H2O2) and photoelectro Fenton (PEF) processes were studied following a 2(3) factorial design with central point insertion, using a first-order mathematical polynomial. In the former process, the combination of a boron-doped diamond (BDD) anode with a carbon-PTFE air-diffusion cathode, both of 3 cm(2), yielded a 76% degradation of LAS at 40 mg L-1 along with 52% TOC removal under optimized conditions. The PEF process with 5 mg L-1 Fe2+ at current density of 77.5 mA cm(-2) allowed attaining a 63% of LAS degradation and 78% of TOC abatement. The best conditions found for PEF according to the factorial design, in terms of Fe2+ concentration and current density, were applied for the treatment of 10 L of raw GW by solar PEF (SPEF) using a compound parabolic collector (CPC) as solar reactor and a filter-press electrochemical cell. A 70% of LAS removal and a 55% of GW mineralization were attained after 240 min of treatment. Artemia salina toxicity tests were performed with effluents resulting from the different methods under optimum conditions, and the SPEF process was proven to be the most effective and promising EAOP for the reduction of GW toxicity.

Automated summary

This study demonstrates the suitability of factorial design for the treatment of greywater (GW) containing dodecyl-benzene sulfonic acid (LAS) using electrochemical advanced oxidation processes (EAOPs). Anodic oxidation with electrogenerated H2O2 (AO-H2O2) and photoelectro Fenton (PEF) processes were studied at bench scale using a factorial design. The optimized conditions for the AO-H2O2 process resulted in a 76% degradation of LAS and 52% TOC removal, while the optimized conditions for the PEF process led to a 63% degradation of LAS and 78% TOC abatement. The solar PEF (SPEF) process with a compound parabolic collector (CPC) as a solar reactor showed a 70% removal of LAS and a 55% mineralization of GW after 240 minutes of treatment.