Degradation Of Xylene And Benzene In Wastewater By Ultrasonic Radiation

The aromatic compound, which has stable properties, cancer-causing function, big toxicity and difficult degradation existes in natural environment extensively.It is contaminant that our country controls prioritily. This experiment was studied on xylene and benzene which is degraded difficultly in the aromatic compound.it is possible that the water quality fits the national effluent standard by ultrasonic radiation. As a kind of catalyst means ,the ultrasonic radiation has developed quickly on the degradation of aromatic compound waste water in the last several decades. Compared with traditional degradation methods of physics, chemistry, bio-chemistry and so on, it is simplicity of operation , geniality of condition , shorter sonication time and higher removal rate. The ultrasonic radiation is subjecting to the more and more concern of domestic and international scholar.The radiation of xylene waste water by ultrasonic radiation and the affecting factors such as reaction vessel , initial concentrations of xylene solution, sound intensity, sonication time, H₂O₂ and solution temperature were studied.The results show that the average of degradation of xylene could come up to 99.2% under the following reaction conditions: 27.6 mg/L of xylene concentration, 1.68 mg/mL H₂O₂ concentration, 24±1 ℃ of temperature, 141.32 W/cm² of sonic intensity and 1 h of irradiation.20.0 mg/L of phenol concentration was treated by ultrasonic radiation, US -H₂O₂ and US - Fenton.Exprimental results showed that the removal rate of phenol when H₂O₂ catalysts added in was higher than ultrasonic radiation and the removal rate of phenol when Fenton reagent added in was higher than H₂O₂ catalysts added in.