Debiec Klaudia, Rzepa Grzegorz, Bajda Tomasz, Uhrynowski Witold, Sklodowska Aleksandra, Krzysztoforski Jan, Drewniak Lukasz
Laboratory of Environmental Pollution Analysis, Faculty of Biology, University of Warsaw, Warsaw, Poland.
Department of Mineralogy, Petrography and Geochemistry, Faculty of Geology, Geophysics and Environmental Protection, AGH University of Science and Technology, Krakow, Poland.
Front Chem. 2018 Mar 16;6:54. doi: 10.3389/fchem.2018.00054. eCollection 2018.
The main element of PbRS (passive (bio)remediation systems) are sorbents, which act as natural filters retaining heavy metals and carriers of microorganisms involved in water treatment. Thus, the effectiveness of PbRS is determined by the quality of the (ad)sorbents, which should be stable under various environmental conditions, have a wide range of applications and be non-toxic to (micro)organisms used in these systems. Our previous studies showed that bog iron ores (BIOs) meet these requirements. However, further investigation of the physical and chemical parameters of BIOs under environmental conditions is required before their large-scale application in PbRS. The aim of this study was (i) to investigate the ability of granulated BIOs (gBIOs) to remove arsenic from various types of contaminated waters, and (ii) to estimate the application potential of gBIOs in technologies dedicated to water treatment. These studies were conducted on synthetic solutions of arsenic and environmental samples of arsenic contaminated water using a set of adsorption columns filled with gBIOs. The experiments performed in a static system revealed that gBIOs are appropriate arsenic and zinc adsorbent. Dynamic adsorption studies confirmed these results and showed, that the actual sorption efficiency of gBIOs depends on the adsorbate concentration and is directly proportional to them. Desorption analysis showed that As-loaded gBIOs are characterized by high chemical stability and they may be reused for the (ad)sorption of other elements, i.e., zinc. It was also shown that gBIOs may be used for remediation of both highly oxygenated waters and groundwater or settling ponds, where the oxygen level is low, as both forms of inorganic arsenic (arsenate and arsenite) were effectively removed. Arsenic concentration after treatment was <100 μg/L, which is below the limit for industrial water.
被动（生物）修复系统（PbRS）的主要元素是吸附剂，它们充当天然过滤器，可保留重金属以及参与水处理的微生物载体。因此，PbRS的有效性取决于（吸）附剂的质量，（吸）附剂应在各种环境条件下保持稳定，具有广泛的应用范围，并且对这些系统中使用的（微）生物无毒。我们之前的研究表明，沼铁矿（BIOs）符合这些要求。然而，在BIOs大规模应用于PbRS之前，需要进一步研究其在环境条件下的物理和化学参数。本研究的目的是：（i）研究颗粒状沼铁矿（gBIOs）从各种类型的受污染水中去除砷的能力，以及（ii）评估gBIOs在水处理技术中的应用潜力。这些研究是使用一组填充有gBIOs的吸附柱，对砷的合成溶液和受砷污染水的环境样品进行的。在静态系统中进行的实验表明，gBIOs是合适的砷和锌吸附剂。动态吸附研究证实了这些结果，并表明gBIOs的实际吸附效率取决于吸附质浓度，且与吸附质浓度成正比。解吸分析表明，负载砷的gBIOs具有高化学稳定性，它们可重复用于其他元素（即锌）的（吸）附。研究还表明，gBIOs可用于修复高含氧水以及地下水或沉淀池（其中氧气水平较低），因为两种无机砷形式（砷酸盐和亚砷酸盐）均被有效去除。处理后的砷浓度<100μg/L，低于工业用水的限值。
