三维煤基吸附电极处理氰化废水试验研究 - -

目前,矿产、金属工业、电子设备制造等行业的快速发展引起工业废水产出量急剧升高,废水中多种有毒离子(如铬、镉、砷等)及锌、镍、金等贵金属,特别是氰化提金过程中产生的CN_T、SCN-、CN-等危害大,必须进行无害化治理。为解决氰化废水中大量有害离子的污染问题,提高氰化废水处理效率,探索三维煤基电极废水处理方法,自制的三维煤基电极以阴、阳电极和活性炭粒子3个组件为主。以电压、时间为变量,分析氰化废水中Zn~(2+)、CN_T浓度的变化规律,结果显示,CN_T、Zn~(2+)去除率符合Lagergren一级动力学模型,随着煤基电极长周期、连续使用,废水中CN_T、Cu~(2+)、Zn~(2+)、CN-、SCN-的去除率分别为93. 74%、97. 28%、95. 22%、95. 13%、97. 05%;增加煤基电极循环使用次数,废水中有害离子的去除率微幅下降,6次循环后,CN_T、Cu~(2+)、Zn~(2+)、CN-、SCN-的去除率分别为92. 17%、94. 65%、92. 67%、90. 14%、97. 02%。升高电压,有害离子的去除率不再随电极板自身的吸附饱和发生变化,煤基电极可重复使用。煤基三维电极设备可简易、低耗、高效地进行工业废液去除处理,值得推广。 At present,the rapid development of mineral industry,metal industry,electronic equipment manufacturing and other industries has led to a sharp increase in the output of industrial wastewater.A variety of toxic ions(such as chromium,cadmium,arsenic,etc.) and precious metals such as zinc,nickel and gold in wastewater,especially CNT,SCN-,CN- produced in the process of gold extraction by cyanidation,are harmful and so the harmless management must be carried out.In order to solve the pollution problem of a large number of harmful ions in cyanide wastewater and improve the treatment efficiency of cyanide wastewater,the wastewater treatment method of three-dimensional coal-based electrode was explored.The self-made three-dimensional coal-based electrodes were mainly composed of anion,anode and activated carbon particles.The variation of Zn2+,CNT in cyanide wastewater was observed with voltage and treatment time as variables.The results show that the removal rates of Zn2+ and CNT ions are in agreement with the Lagergren first-order kinetic model.With the long-term and continuous use of coal-based electrodes,the experimental results show that the removal rates of CNT,Cu2+,Zn2+,CN-and SCN- are 93.74%,97.28%,95.22%,95.13% and 97.05% respectively.With the increase of coal-based electrodes recycling times,the removal rate of harmful ions in each wastewater decreases slightly.After six cycles,the removal rates of CNT,Cu2+,Zn2+,CN-and SCN- are 92.17%,94.65%,92.67%,90.14%,97.02%.When the voltage is increased,the removal rate of harmful ions does not change with the adsorption saturation of the electrode plate itself,and the coal-based electrode can be reused.Coal-based three-dimensional electrode equipment can be used for industrial waste liquid removal with simplicity,low consumption and high efficiency,which is worth of promotion