Soil Fulvic Acid Degradation By Ozone In Aqueous Medium

Abstract

Armadale soil fulvic acid (SFA) was found to contain several loosely bound organic impurities which could be removed by ethyl acetate extraction. The ozonation of purified Armadale SFA at a variety of dosages was characterized by monitoring the UV absorbance, weight loss, pH changes, total acidity, molecular weight and elemental composition. SFA could only be partially degraded even under ozone dosages as high as SFA/O 3 (w/w) of 1:6. At high ozone dosages (SFA/O 3 1:6) mostly aliphatic compounds rich in oxygen were produced, whereas at low ozone dosages (SFA/O 3 < 1:0.5) mainly benzene polycarboxylic acids and polyhydroxy benzene polycarboxylic acids were found. The solid material isolated from the chlorination (0.5 mg/L residual level) of residues from the ozonation (SFA/O 3 1:0.2 to 1:0.5) of Contech SFA did not contain any chlorinated products.

Photocatalytic oxidation technology for humic acid removal using a nano-structured TiO2/Fe2O3 catalyst

“…The traditional treatment methods for the removal and degradation of humic acids, such as adsorption, coagulation, ion-exchange, super chlorination, ozonation and biological degradation, have their own limitations due to the cost and secondary pollution, etc. (Naumczyk et al, 1989;Benoit et al, 1993;Zhou and Banks, 1993;Jucker and Clark, 1994). However, photocatalytic oxidation (PCO) as a clean production process has a significant advantage in treatment of humic acids.…”

Experimental and theoretical studies on the removal of polycarboxy-benzoic acids by adsorption onto polyaniline from aqueous solution

“…It undergoes biological, chemical, and photochemical transformations and generally produces carboxylic acids of low molecular weight, such as benzene polycarboxylic acids and polyhydroxy benzene polycarboxylic acids. These acids behave as surfactants due to their functional groups [6][7][8][9]. The removal of such compounds in industrial wastewater is important because they are widely produced and used as intermediate reactants in the fabrication of resins, plasticizers, dyes, printing inks, and polymers; also, the elimination of this compound from natural water in purification stations can be of interest because they constitute model pollutants originating from biodegradation of biomass [10].…”