周期换向电凝聚法处理黄连素模拟制药废水研究  

On berberine-treating simulated sewage through periodically alternating electrocoagulation

作　　者：孙兆楠[1] 胡筱敏[1] 董嫦娥[1] 

机构地区：[1]东北大学资源与土木工程学院,沈阳110004

出　　处：《安全与环境学报》2011年第6期60-64,共5页Journal of Safety and Environment

基　　金：国家水专项(2011ZX07532-002);国家科技重大专项课题(20092X07526-006)

摘　　要：为了降低能耗和解决极板钝化问题,以铝板和铁板为反应电极,与周期换向电源装置组成无隔膜体系,以黄连素模拟废水为处理对象,对周期换向电凝聚法处理制药废水进行试验研究。结果表明,反应电压、换向周期、极板间距、电解质浓度及搅拌速度对处理效果都有较大影响。在反应电压为6 V,换向周期为10 s,极板间距为0.3～O.6 cm,电解质Na_2SO_4浓度为0.015 mol/L,搅拌速度为750 r/min,初始pH值为3～10的条件下,质量浓度为800 mg/L的模拟制药废水反应60min,黄连素去除率可达99.11%。研究表明,周期换向电凝聚法处理黄连素模拟制药废水具有技术可行性。通过对反应机理初步分析,推断模拟废水中大部分黄连素分子是通过气体气浮作用和金属离子絮凝作用直接去除,部分黄连素分子由氯离子在反应过程中形成的中间产物及羟基自由基氧化作用去除。This paper intends to report our research findings on the removal efficiency of bererine from the simulated pharmaceutical sewage by using the periodically alternating electric current regulation while functioning between the iron and aluminum electrodes. so as to reduce the energy consumption and electrode passivation. In proceeding with our experiments, we have done an investigation over the influence of the reaction voltage, the reaction time, the distance between the electrode plates and the alternating periods, electrolyte concentration and the initial pH value on the treating results. The experimental results we have gained show that the efficiency of bererine removal from the simulated pharmaceutical sewage can be made to reach 99.11% under the optimal conditions, that is, during the ideal reaction time of 60 min, with the reaction voltage being 6 V, and the distance between electrode plates — 0.3-0.6 cm. Besides, the alternating period should be regulated in 10 s and the stirring speed should be 750 r/min, with the electrolyte concentration being 0.015 mol/L and initial pH value — 3-10. The above illustrated experimental results show that the method of electro-coagulation with periodically alternating treatment with berberine proves to be technically feasible, effective and promising in its future application. In addition, the experimental process, the characteristic absorption peaks of the berberine molecule at 228 nm, 263 nm and 344 nm tend to decrease with the prolonging of the reaction time. Furthermore, the characteristic absorption peaks tend to disappear almost immediately when the reaction time reaches 60 min. The analysis of the above experimental results helps to conclude that almost all the bererine molecules can be removed directly by means of flotation function of gas molecular and coagulation of metal-ion compounds, with part of the molecules removed by oxidation of hydroxyl radicals and intermediates.

关 键 词：环境工程学 周期换向 电絮凝 黄连素 去除率 

分 类 号：X506[环境科学与工程—环境工程]