纳米热处理黄铁矿催化电芬顿降解腐殖酸

Degradation of Humic Acid by Electro-Fenton Catalyzed by Nano Heat Treated Pyrite

腐殖酸是垃圾渗滤液中高浓度有机污染物的主要成分,使用纳米热处理的黄铁矿催化电芬顿工艺降解模拟腐殖酸废水和垃圾渗滤液。对热处理黄铁矿进行了表征,结果表明热处理使黄铁矿发生相变,增大了比表面积,提高了亚铁离子和多硫化物相对质量分数。探究了黄铁矿的热处理温度,阳极种类、电流密度、催化剂浓度和pH对腐殖酸的降解影响,讨论了阳极种类和电流密度对能耗比的影响。结果表明,热处理700℃的黄铁矿表现出更好催化性能,在优化条件下(BDD阳极、30 mA/cm^(2)、催化剂浓度1 g/L、pH 2.5),去除了90.63%的TOC,实现了较低的能耗比。使用该工艺处理实际垃圾渗滤液,TOC和COD分别去除了70%和66%,并且提高了垃圾渗滤液可生化性。

Humic acid was the main component of high-concentration organic pollutants in landfill leachate.The simulated humic acid wastewater and landfill leachate were degraded by an electro-Fenton process catalyzed by nano heat-treated pyrite.The heat treatment of pyrite was characterized.The results showed that the heat treatment made pyrite undergo phase transformation increased the specific surface area,and the relative mass fraction of ferrous ions and polysulfides was also increased.The effects of heat treatment temperature of pyrite,anode type,current density,catalyst concentration and pH on the degradation of HA were investigated.The effects of anode type and current density on the energy consumption ratio were discussed.The results showed that pyrite after heat treatment at 700 ℃ had better catalytic performance.Under the optimized conditions(BDD anode,30 mA/cm^(2),catalyst concentration 1 g/L,and pH=2.5),the removal of TOC was 90.63%,and the energy consumption ratio was lower.Actual landfill leachate was treated using this process.The TOC and COD were removed by 70% and 66% and improved the biodegradability.