Fluoride removal by a continuous flow electrocoagulation reactor

Long-term consumption of water containing excessive fluoride can lead to fluorosis of the teeth and bones. Electrocoagulation (EC) is an electrochemical technique, in which a variety of unwanted dissolved particles and suspended matter can be effectively removed from an aqueous solution by electrolysis. Continuous flow experiments with monopolar aluminium electrodes for fluoride removal were undertaken to investigate the effects of the different parameters such as: current density (12.5-50A/m(2)), flow rate (150-400 mL/min), initial pH (4-8), and initial fluoride concentration (5-25mg/L). The highest treatment efficiency was obtained for the largest current and the removal efficiency was found to be dependent on the current density, the flow rate and the initial fluoride concentration when the final pH ranged between 6 and 8. The composition of the sludge produced was analysed using the X-ray diffraction (XRD) spectrum. The strong presence of the aluminium hydroxide [Al(OH)(3)] in the above pH range, which maximizes the formation of aluminium fluoride hydroxide complex [Al(n)F(m)(OH)(3n-m)], is the main reason for defluoridation by electrocoagulation. The results obtained showed that the continuous flow electrocoagulation technology is an effective process for defluoridation of potable water supplies and could also be utilized for the defluoridation of industrial wastewater.     

高压低流电化学深度处理砷氟废水技术研究

为解决企业外排生产废水砷氟超标问题,采用高压低流电化学技术对某矿山企业外排的含砷氟废水进行深度处理,研究考察进水pH值,电流密度,电化学反应时间、极板材料、絮凝反应、pH等工艺条件对处理效果的影响。得到2最佳工艺条件为进水pH5.5左右、絮凝pH6.5~7.0、电化学反应时间6 min,铁铝极板比例为1:2,电流密度10.9 m A/cm。处理出水中的砷、氟能稳定达到《地表水环境质量标准》(GB3838—2002)Ⅲ类水体水质标准要求。     

活性炭颗粒填充三维电极电化学烟气脱硫的研究

基于三维电极电化学技术较高的反应效率和不产生废弃物等优点,将这一先进的反应器运用到烟气脱硫领域.用活性炭作为工作电极,在通电状况下,将模拟烟气通入反应器发生反应.通过一系列试验,分析了填充床厚度、槽电压、进气流量、通电时间对脱硫率的影响,并且探讨了该反应的反应原理.     

活性炭纤维（ACF）电极法处理染料废水的探讨

根据Ａｄｖａｎｃｅｄ Ｃｈｅｍｉｃａｌ Ｏｘｉｄａｔｉｏｎ＾［１］［６］的原理，通过ＡＣＦ电极的引入，使得电化学处理成为一个自由基反应与絮凝反应相结合的过程，对于多种模拟印染废水可以具有良好的处理效果。通过与其他方法的对比实验，表明在色度去除率方面不比Ｆｅｎｔｏｎ试剂法逊色，并明显优于絮凝法。经过单级处理，对于实验范围内的还原染料、酸性染料、活性染料及硫化染料，其脱色率全部大于９０％，大多数为９８     

液/液界面电化学及在环境监测分析中的应用

介绍了液/液界面电化学四种基本结构和主要实验方法,综述了液/液界面电化学分析方法在环境监测分析中的应用。作为一种新方法测定离子载体及能与其形成络合物的金属离子组分的浓度,它具有简便、快捷、经济实用等特点。     

电化学催化氧化降解有机物的机理及研究进展

介绍了电化学催化氧化降解水中有机物的机理：电化学直接氧化和电化学间接氧化、在电催化氧化过程中应用的电极材料、电极结构及其催化特性、国内外目前的研究进展、指出了目前研究降解机理中的存在缺陷。最后提出了电化学催化氧化在实际工程中应用存在的问题及今后电化学催化氧化降解有机物的研究重点。     

磷加工工艺废水电化学处理与利用研究

本文采用化学方法对湖北黄麦岭磷矿选矿废水进行了处理与利用研究,提出了电化学处理最佳条件,处理水回用比.结果表明,尾水经电化学处理返回选别流程,不仅可大大减少 Na_2CO_3用量,而且还获得较清水流程更好的选矿指标.     

TiO_2/Ti薄膜电极制备和光电催化降解罗丹明B的研究

以TA1钛合金为原料采用阳极氧化法制备新型薄膜电极 -TiO2 Ti电极 ,运用X射线衍射法、扫描电镜对电极表面膜的粒径、物相进行了表征。结果表明 ,控制反应条件 ,薄膜中二氧化钛晶型以锐钛矿型为主 ,粒径 45～ 5 0nm ,将其应用于光催化氧化水中的罗丹明B ,该电极对其降解有很好的光催化活性 ,同时 ,外加一定的偏压可以提高光催化氧化的效率     

CO2 corrosion control in steel pipelines. Influence of turbulent flow on the performance of corrosion inhibitors

Corrosion associated with aqueous environments containing carbon dioxide (CO₂) and/or hydrogen sulphide (H₂S), is a well-known phenomenon in oil and gas industries. This type of corrosion is of particular importance in transportation through steel pipelines. This transportation process could involve the movement of a complex mixture of gas and liquids. This moving mixture is in close contact with the inner surface of the steel pipelines and corrosion can occur. It has been demonstrated that this corrosion is influenced by flow.In oil and gas industries, film-forming corrosion inhibitors are the main tool used to control inner corrosion in pipelines. The movement of the environment generates mechanical shear stresses on the surface of the steel that can interfere with the formation of the film. This phenomenon is frequently not taken into account in corrosion control strategies and could cause problems. Despite the importance of this, there are few scientific studies available, which can provide control criteria.This work presents some ideas developed in order to understand the influence of flow on the corrosion process, making emphasis in the corrosion process associated with carbon dioxide (CO₂).     

电化学水处理技术的研究和应用

介绍了电化学技术的分类,总结了电化学技术在处理有机废水、重金属离子废水和氨氮废水方面的研究及应用现状,并指出了该技术在目前的应用中所存在的一些问题,探讨了今后的发展方向。