摘要:以哈尔滨某地含高浓度铁锰地下水为处理对象,研究了进水Fe^2+浓度对单级非均匀级配石英砂滤料除铁除锰滤柱启动期间成熟期的影响。试验中,Fe^2+和Mnn可被单级滤柱相继去除,滤柱上层是棕褐色的除铁层,滤柱下层为黑褐色的除锰层,进水中的Fe^2+易于被去除,而Mn^2+的去除则受进水中FeH浓度的影响。试验表明,锰质滤膜受Fe^2+污染可致滤膜中的锰被还原溶出,控制因素是锰膜对Fe^2+的单位吸附量,而非水中Fe^2+浓度。进水中Fe^2+浓度很低时,除锰成熟期较短(45d),随着进水中Fe^2+浓度的增加,滤池中除铁层增厚,导致除锰层被压缩,除锰层中锰质活性滤膜受到Fe^2+污染的程度不断加重,滤池除锰成熟期显著延长。
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