Application of Natural Zeolite as Catalyst in the Degradation of the Azo Dye DO39 by Plasma.

The discharge of industrial wastewater with dyes into natural tributaries has serious environmental consequences on aquatic ecosystems and the health of living beings. Atmospheric plasmas have proven to be very useful for the degradation of organic contaminants in water; in this context, corona type discharge, owing to its physical characteristics, is capable of degrading and even mineralizing dyes dissolved in water. In this work, zeolite was used as a catalyst in the degradation of the textile azo dye Direct Orange 39 (DO39) through interaction with plasma generated at atmospheric pressure.

Removal of ibuprofen, naproxen and 17-β-estradiol in water using constructed wetlands.

This study was developed to evaluate the removal potential of ibuprofen, naproxen and 17-β-estradiol in artificial wetlands constructed on a laboratory scale, using eight experimental devices planted with species, tested with gravel substrate and without gravel substrate, which were fortified with synthetic mixtures at concentrations of 1, 2 and 5 mg/L of the three compounds, during a batch exposure time of nine days. The removal efficiency for 17-β-estradiol was 94.5 ± 2.

Physical-Chemical Assessment of Azo Dye Basic Violet I (BVI) Discoloration Using the Corona Plasma in Batch and Flow Systems.

The decolorization of the Basic violet I (BVI) dye when interacted with a corona discharge is studied in the present work, taking in account two systems, batch and flux. The current and voltage were measured during the whole process in which a corona plasma was generated, with an applied power of 51.9 and 167.

Degradation of water polluted with used cooking oil by solar photolysis, Fenton and solar photo Fenton.

The degradation of used cooking safflower oil aqueous solutions by photolysis, Fenton, and photo Fenton under solar light is reported. The processes were carried out in a photochemical reactor with recirculation. Operating variables such as, pH, oil concentration and molar ratio of [H(2)O(2)]:[oil] were investigated to test their effects on the treatment efficiency of Fenton process.