高铁酸盐的电化学合成及对活性污泥的处理进展

Progress in Electrochemical Synthesis of Ferrates and Treatment of Activated Sludge

活性污泥(WAS)产量的不断增加已经成为污水厂普遍存在的难题。高铁酸盐具有氧化、消毒、絮凝、吸附等作用,在污泥处理中具有良好的应用前景。同时,高铁酸盐在常温下具有不稳定性,极易分解,需要在线生产的技术。本文从高铁酸盐的性质出发,综述了高铁酸盐的电化学合成方法及其影响因素,并对其在线生产高铁酸盐的应用进展进行介绍;总结了高铁酸盐对于活性污泥处理中的污泥脱水、最小化和厌氧发酵等三个方面的处理机理和影响。最后,提出了对于未来发展方向的认识,以期提高处理效率、节约成本。

The increasing production of waste activated sludge(WAS) has become a common problem in wastewater treatment plants. Ferrate, which can oxidize, disinfect, flocculate or adsorb particles, has great potential for future application in sludge treatment. However, ferrate is volatile at room temperature which readily decomposes to ferric iron. Therefore, there is a great demand for on-line production technology of ferrate. In this paper, based on the properties of ferrates, the electrochemical synthesis of ferrates and its influencing factors are reviewed, and the application progress in the on-line production of ferrates is introduced. Then, treatment mechanisms and effects of ferrate on sludge dewatering, minimization and anaerobic fermentation in WAS treatment are illustrated. Finally, the paper is summed up and an understanding for the related future development is put forward in order to improve treatment efficiency and save costs.