UV/Sodium percarbonate for bisphenol A treatment in water: Impact of water quality parameters on the formation of reactive radicals.

Reported herein is an investigation of the impact of water quality parameters on the formation of carbonate radical anion (CO) and hydroxyl radical (HO) in UV/sodium percarbonate (UV/SPC) system versus in UV/hydrogen peroxide (UV/HO) system for bisphenol A (BPA) degradation in water. Pathways of CO oxidation of BPA were proposed in this study based on the evolution of direct transformation products of BPA. Observed in this study, the degradation of BPA in the UV/SPC system was slower than that in the UV/HO system in the secondary effluents collected from a local wastewater treatment plant due to the significant impact of coexisting constituents in the matrices on the former system.

Using toxicity testing to evaluate electrochemical reactor operations.

In the present study, the Microtox® test was used to track the toxicity of electrochemical effluents to the marine bacteria Vibrio fischeri as a function of reaction time. When electrochemistry was used to degrade aqueous phenol using different reactor configurations, two reaction pathways were identified, chlorine substitution and oxidation, depending on whether the electrolyte contained chloride. For a boron-doped diamond (BDD) anode, electrochemistry using Na₂SO₄ electrolyte produced a significantly more toxic effluent than when using NaCl electrolyte with all other conditions remaining the same.