地下水常含有铁锰,吸附法除铁除锰简单实用。采用天然沸石对地下水中铁锰进行吸附试验研究。试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;原溶液浓度不同时,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>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。
Abstract
Adsorption is convenient and practical in removing iron and manganese in groundwater. Test of adsorbing iron and manganese by natural zeolite was carried out. Results reveal that the adsorption of iron and manganese by natural zeolite complies with Freundlich’s isothermal adsorption formula, and the removal rates of iron and manganese increase with the increase of zeolite dosage. The higher concentration of original solution is, the larger adsorption amount of iron and manganese is; but with the concentration of original solution increasing, the removal rate of iron gradually reduces, whereas the removal rate of manganese tends to decrease when solution concentration is greater than 5 mg/L. Moreover, the optimum duration of adsorbing iron and manganese is 30 min and 20 min, respectively. As adsorption duration exceeds the optimum, the adsorption amounts both decrease. The test lasts for 70 days and proves that the natural zeolite could not effectively adsorb manganese, with the lowest manganese content in the effluent water over 0.1 mg/L, not reaching national standard (which is ≤ 0.1 mg/L); while the effect of removing iron is better than removing manganese, and the lowest iron content in effluent water approaches 0.0 mg/L, within the national drinking water standard (0.3 mg/L).
关键词
天然沸石 /
吸附性能 /
铁 /
锰 /
地下水
Key words
natural zeolite /
adsorption performance /
iron /
manganese /
groundwater
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基金
江西省自然科学基金项目(20132BAB203033)
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