Removal of Pentachlorophenol in Groundwater by E-Fenton Coupled with Permeable Reactive Barriers

• Main Authors: Tsung-Po Hung, 洪琮博
• Other Authors: 廖文彬
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/45698301935868727660

碩士 === 國立中興大學 === 環境工程學系所 === 96 === Permeabe reactive barrier(PRB) embedded with zero-valent iron(Fe0) has been used as the remediation technology of ground water. The method develops greatly in the recent years for the dechlorination or completely destroy of pentachlorophenol(PCP). The E-Fenton method is a popular waste water treatment technique that could produce hydrogen peroxide by cathode, which then react with ferrous iron (called Fenton processes). Fenton reaction could degrade PCP by oxidation. The purpose of this study is to estimate the removal of PCP by E-Fenton coupled with PRB in a recirculating batch experiment, and to gain the best condition for this system and the removal mechanism of PCP. Based on the results of background experiment, 0.7 L/min air applying could produce 5.2×10-3 mg/min hydrogen peroxide. PCP of 5 mg/L could be degraded for 63%, and mineralized for 26% when initial pH is 4, flow direction is cathode to anode, PRB consists of Fe0/quartz sand(QS)=1/60(g/g), current density is 0.75mA/cm2, and flow rate is 20 mL/min. The removal efficiency and mineralization of E-Fenton is better than those of traditional Fenton process. Because of the concentration of Fe2+ is too high in this system, when the efficiency increased proportionally, the producing ratio of hydrogen peroxide increased.