掺硼金刚石三电极系统处理垃圾渗滤液实验研究

实验以掺硼金刚石电极为阳极构建三电极系统处理稳定的垃圾渗滤液.考察了稀释比、初始pH值、电流密度和极板间距4个因素对垃圾渗滤液污染物去除率的影响.实验结果表明,电流密度、稀释比是影响电化学氧化垃圾渗滤液的主要因素,极板间距、初始pH值对电化学氧化垃圾渗滤液的影响较小.在稀释比为1:2、电流密度为75 mA/cm2、pH值未调节、极板间距为10 mm最优工况时,经过5 h电化学氧化后NH4+-N、COD均能完全去除;NH4+-N、COD去除率分别满足线性方程y =21.759t、y =20.717t,对应的线性相关系数为0.9923和0.9925.最优工况条件下,BDD电极电化学氧化垃圾渗滤液的能耗为260 kWh/m3.

Experimental research on treatment of landfill leachate by boron-doped diamond anode in three electrodes system

Electrochemical oxidation of mature landfill leachate was conducted in three electrodes system using boron-doped diamond electrode as anode. The effects of four operating parameters such as dilution ratio, initial pH, current density and electrode gap on the removal efficiency of ammonia nitrogen and COD were investigated. Experimental results show that current density and dilution ratio are the determinable parameters affected the electrochemical oxidation efficiency of landfill leachate. Initial pH value and electrode gap have a little effect on efficiency of electrochemical oxidation. Under the optimal conditions (e.g. dilution ratio of 1:2, current density of 75 mA/cm2, no adjustment of initial pH and electrode gap of 10mm), complete abatement of NH4+-N and COD were achieved after electrolysis of 5 hours. Linear function y =21.759t, y =20.717t is well fit to experimental data of NH4+-N and COD removal rate, respectively. The related correlation coefficients are 0.9923 and 0.9925, respectively. Energy consumption of electrochemical oxidation on BDD anode is 260 kWh/m3 under the optimal conditions.