WASTEWATER TREATMENT CONTAINING DATA WITH PERSISTENT ORGANIC POLLUTANTS BY ADVANCED OXIDATION PROCESSES
CRISTINA MARIA ALDEA
ABSTRACT. - Wastewaters treatment containing data with persistent organic pollutants by advanced oxidation processes. The purpose of the paper is testing the activity of a catalyst type mixed oxide CuO-Al2O3 in oxidation of acetic acid, oxalic acid and succinic acid in aqueous solutions, and analyze the influence of operational parameters: ozone dose, pH and concentration of catalyst on the process.
- The method of analysis used is a high performance liquid chromatography ( HPLC) and can be implemented using a chromatograph with the following features: Inertsil column, Diode Array UV detector, mobile phase: sodium phosphate with concentration 0.1 M and phosphoric acid on pH=2,5.
- The results obtained by this method are: the observation of changes that occurring in the degradation under the action of ozone on the intractability pollutants considered in the analysis of sewage samples. Oxalic acid, acetic acid and succinic acid are resistant to the actions of ozone itself.
- These conversion do not exceed 20% for a reaction time of 240 minutes, at ozone dose of 3,5 mg .L-1, the lowest reactivity presenting acetic acid with a maximum conversion of 8%.
- Efficiency of oxidation process can be increased using catalytic systems that favour the generation hydroxyl species strong oxidizing and non-selective.
- Using the torque O3/CuO -Al2O3 has the effect more pronounced degradation of acids. Oxalic acid is completely degraded at high speed in a short period of time exceeding 90 minutes. Succinic acid by partial oxidation leads to oxalic.
Keywords: oxalic acid, succinic acid, high performance liquid chromatography (HPLC), ozone, catalyst, couple O3/CuO-Al2O3, chromatograph.