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地下水常有含铁锰,吸附法除铁除锰简单实用,有助于保障饮用水安全。采用天然沸石对地下水中铁锰进行吸附实验研究,考察天然沸石对铁锰去除的吸附性能,进一步了解天然沸石吸附地下水中铁锰的动力学方程和影响因素。实验结果表明:天然沸石对铁、锰的吸附符合弗劳德利希吸附等温式,去除率随着沸石投加量的增大而逐渐提高。原溶液浓度越高,铁、锰的吸附量则越大;不同原溶液浓度时,铁的去除率随原溶液浓度增加而逐渐下降,锰的去除率在溶液浓度大于5 mg/L时呈现下降趋势。铁和锰的最佳吸附时间分别为30 min和20 min,铁、锰吸附时间大于相应最佳吸附时间时,则两者吸附量都会下降。为期70 d的试验表明,天然沸石除锰效果不好,出水水质最低含锰量超过0.1 mg/L,出水水质基本都没达到国家标准(≤0.1 mg/L),而除铁的出水水质基本都在国家饮用水卫生标准值0.3 mg/L以内,最低值接近0.0 mg/L,其整体除铁效果要好于除锰。
Groundwater often contain iron and manganese, iron and manganese adsorption method is simple and practical, helps to ensure the safety of drinking water. Adsorption experiments of Fe and Mn in groundwater by natural zeolite were carried out to investigate the adsorption properties of Fe and Mn by natural zeolite and to further understand the kinetics equation and influencing factors of Fe and Mn in groundwater adsorbed by natural zeolite. The experimental results show that the adsorption of Fe and Mn by natural zeolite conforms to the Friedel-Crafts adsorption isotherm, and the removal rate gradually increases with the increase of zeolite dosage. The higher the concentration of the original solution, the greater the adsorption capacity of iron and manganese. At different concentrations of the original solution, the removal rate of iron decreased with the concentration of the original solution and the removal rate of manganese decreased when the concentration of the solution was more than 5 mg / L trend. The optimum adsorption time of iron and manganese were 30 min and 20 min, respectively, while the adsorption time of iron and manganese was greater than the corresponding optimum adsorption time, the adsorption capacity decreased. The test for 70 days showed that the removal of manganese from natural zeolite was not good and the lowest manganese content of effluent was over 0.1 mg / L. The effluent quality basically did not reach the national standard (≤0.1 mg / L) All in the national standard of drinking water within 0.3 mg / L, the lowest value close to 0.0 mg / L, the overall removal of iron is better than the effect of removing manganese.