Preparation and release characteristics of controlled release potassium permanganate

• 出 处: 2012 Postdoctoral Symposium of China on Materials Science &a
• 发表日期: 2012年期

　　To extend the duration of KMnO4 in the groundwater in situ remediation, controlled release oxidant was prepared by dispersing the KMnO4 particles in the molten paraffin wax.Preparation conditions, including the decentralized and the weight ratio of KMnO4 to wax (P/W) were optimized.The results showed that the ultrasonic treatment and the stirring at 150r/min contribute to the most uniform dispersion of the particles in the molten paraffin wax.KMnO4 loading amount increased with the increasing of P/W, while the absolute recovery rate decreased.The releasing characteristics of the samples in the distilled water were examined by the bench scale tests for the temperature of 8 ℃, different pH and dissolved oxygen (DO).The results showed that controlled release potassium permanganate still having release properties at 8 o℃.It was significantly affected by pH, whereas was slightly affected by DO concentration.Controlled release KMnO4 oxidant was used to remove COD in the leachate and 57.1% removal efficiency was obtained and the amount of the deposit was only 8.5% of that where pure KMnO4 was added.