State Key Laboratory of Powder Metallurgy, School of Materials Science and Engineering, Central South University, Changsha, 410083, People's Republic of China.
State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, 150090, People's Republic of China.
Chemosphere. 2020 Aug;252:126499. doi: 10.1016/j.chemosphere.2020.126499. Epub 2020 Mar 16.
Cyanide-containing organic wastewater is discharged in large quantities by coking, electroplating and pharmaceutical industries, which seriously endangers environmental safety and human health. In this paper, Electrochemical Oxidation-Persulfate (EO-PS) Advanced Oxidation Process (AOP) was firstly used to treat high concentration cyanide-containing organic wastewater obtained from a chemical enterprise. The potential application of this process in the treatment of high concentration cyanide-containing organic wastewater was explored for the first time, and the effects of current density, initial pH, temperature and initial concentration on chemical oxygen demand (COD), total organic carbon (TOC) and total cyanide (CN) removal in wastewater were systematically investigated. The results shown that the EO-PS process had an excellent removal effect on organics and cyanide in high concentration cyanide-containing organic wastewater which contained 11,290 mg L COD, 4456 mg L TOC and 1280.15 mg L CN. The COD, TOC and CN removal at optimized operating parameters for 24 h were 95.8%, 87.8% and 98.4%, respectively. The corresponding electrical energy per order was only 41.6 kWh m order. In addition, the pollutants removal can be accelerated under conditions of high current density, acidic solution, appropriate temperature and low pollutant concentration, among which low current density, low pH, appropriate temperature and low pollutant concentration can effectively diminish energy consumption. Cyanide, COD and TOC degradation in all reaction conditions followed the pseudo-first-order kinetic model.
含氰有机废水主要来自焦化、电镀和制药等行业，大量排放会严重危害环境安全和人类健康。本研究首次采用电化学氧化-过硫酸盐（EO-PS）高级氧化工艺（AOP）处理某化工企业高浓度含氰有机废水，探索该工艺在处理高浓度含氰有机废水中的应用潜力，系统考察电流密度、初始 pH 值、温度和初始浓度对废水中化学需氧量（COD）、总有机碳（TOC）和总氰化物（CN）去除的影响。结果表明，EO-PS 工艺对高浓度含氰有机废水中 COD、TOC 和 CN 的去除效果良好，在优化运行条件下 24 h 后 COD、TOC 和 CN 的去除率分别为 95.8%、87.8%和 98.4%，相应的 COD 去除单位能耗仅为 41.6 kWh m order。此外，在高电流密度、酸性溶液、适当温度和低污染物浓度条件下，污染物去除可以得到加速，其中低电流密度、低 pH 值、适当温度和低污染物浓度可以有效降低能耗。在所有反应条件下，氰化物、COD 和 TOC 的降解均遵循准一级动力学模型。
