Liang Yong-mei, Jun Ma, Liu Wei
School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin, P.R. China.
Water Environ Res. 2007 Nov;79(12):2420-6. doi: 10.2175/106143007x212148.
A laboratory study demonstrated that ferrate pretreatment significantly enhanced lead and cadmium removal in alum coagulation, under the conditions of natural surface water. The enhancement of lead removal was approximately 21 to 37% by ferrate pretreatment at a dosage of 1 to 5 mg/L. The enhanced removal of cadmium by ferrate pretreatment at a dosage of 1 to 5 mg/L exceeded the removal by alum coagulation alone 2-to 12-fold. Cadmium is much more difficult to remove than lead in alum coagulation. The performance of ferrate in enhancing the removal of lead and cadmium in alum coagulation was better than that of ferric chloride. The removal of lead and cadmium was highly pH-dependent, following the general trend of higher pH being related to higher removal. Satisfactory removal of cadmium could be expected by ferrate pretreatment combined with adjusting the pH of the water.
一项实验室研究表明，在天然地表水条件下，高铁酸盐预处理显著提高了铝盐混凝过程中铅和镉的去除率。在1至5mg/L的投加量下，高铁酸盐预处理对铅的去除率提高了约21%至37%。在1至5mg/L的投加量下，高铁酸盐预处理对镉的去除增强效果比单独铝盐混凝高出2至12倍。在铝盐混凝中，镉比铅更难去除。高铁酸盐在增强铝盐混凝中铅和镉去除方面的性能优于氯化铁。铅和镉的去除高度依赖于pH值，总体趋势是pH值越高，去除率越高。通过高铁酸盐预处理并结合调节水的pH值，可以预期镉能得到令人满意的去除效果。
