Arsenic Species Transformation and Transportation in Arsenic Removal by Fe-Mn Binary Oxide–Coated Diatomite: Pilot-Scale Field Study
Arsenic Species Transformation and Transportation in Arsenic Removal by Fe-Mn Binary Oxide–Coated Diatomite: Pilot-Scale Field Study
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DOI：
10.1061/(asce)ee.1943-7870.0000432
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发表时间：
2011-12
影响因子：
2.2
通讯作者：
Kun Wu;Ruiping Liu;Huijuan Liu;F. Chang;H. Lan;J. Qu
中科院分区：
文献类型：
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作者：
Kun Wu;Ruiping Liu;Huijuan Liu;F. Chang;H. Lan;J. Qu
在固定床反应器中，研究了铁锰复合氧化物（FMBO）对砷（As）的去除效果以及As、Fe和Mn在固定床反应器中的迁移转化规律（As（Asd Ⅲ）= 50-80 μ g/L，As（AsdV）= 40-60 μ g/L）。在再生之前，流出物As（tot）减少到小于10 μ g= L，没有残留的As（III）。FMBO-硅藻土原位再生后，表现出较高的吸附能力的As与突破床体积增加550至760床体积后，三个周期的操作。As（III）和As（V）在吸附柱沿着不同层的残留浓度表明As（III）在滤层中的氧化和迁移。此外，FMBO-SBR还能有效去除进水中的浊度、铁和锰，且不会造成二次污染。酸稀释分析表明，在三个循环后，通过FMBO的上层铁含量更多，锰含量更少。这是由于As（III）和Fe（II）在FMBO中被二氧化锰（MnO（2））氧化以及随后Mn（II）的迁移。反洗程序导致吸附剂的尺寸分类。然而，由于原位再生，在三个操作循环后，FMBO-100也显示出尺寸直径增加。DOI：10.1061/（ASCE）EE.1943-7870.0000432。(C)2011年，美国土木工程师协会。
The removal of arsenic (As) by iron (Fe)-manganese (Mn) binary oxide-coated diatomite (FMBO-diatomite) and the transformation and transportation of As, Fe, and Mn in a fixed-bed reactor were investigated in this pilot-scale field study (arsenite [AsdIII] = 50-80 mu g/L, arsenate [AsdV] = 40-60 mu g/L). Before regeneration, the effluent As(tot) was reduced to less than 10 mu g= L with no residual As(III). FMBO-diatomite exhibited elevated adsorptive capability of As after in situ regenerations with breakthrough bed volumes increasing from 550 to 760 bed volumes after three cycles of operation. The residual concentrations of As(III) and As(V) at different layers along the adsorption column indicated the oxidation of As(III) and the As transportation during the filter layer. Additionally, FMBO-diatomite could efficiently remove the turbidity, Fe and Mn in influents, without causing secondary pollution. Acid dilution analysis showed more Fe content and less Mn content after three cycles through the FMBO-diatomite upper layer. This was attributable to the oxidation of As(III) and Fe(II) by manganese dioxide (MnO(2)) within FMBO and the transportation of Mn(II) thereafter. The backwashing procedure led to a size classification of adsorbents. However, the FMBO-diatomite also showed increased size diameter after three cycles of operation because of the in situ regeneration. DOI: 10.1061/(ASCE)EE.1943-7870.0000432. (C) 2011 American Society of Civil Engineers.