Improving the sustainability of granular iron/pumice systems for water treatment.
Improving the sustainability of granular iron/pumice systems for water treatment.
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DOI：
10.1016/j.jenvman.2013.02.042
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发表时间：
2013-05
影响因子：
8.7
通讯作者：
S. Bilardi;P. Calabrò;S. Caré;N. Moraci;C. Noubactep
中科院分区：
文献类型：
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作者：
S. Bilardi;P. Calabrò;S. Caré;N. Moraci;C. Noubactep
金属铁（Fe 0）目前用于地下和地上水过滤系统的实用基础。最近的理论研究表明，为了可持续发展，这种系统不应含有超过60%的Fe 0（体积/体积）。预测已经验证了在Fe 0/砂系统使用亚甲基蓝作为操作示踪剂。目前的工作是第一次尝试用浮石颗粒实验验证新概念。一个良好的表征浮石样品被用作操作支持材料，并与200克的颗粒Fe 0，在体积比例，从0到100%的变化混合。得到的柱系统的特征在于（i）由它们的水力传导率的时间依赖性的演变和（ii）为他们的效率，从三个污染物的解决方案（约0.3 mM的每种金属）的CuII，NiII，和ZnII的去除。试验结果表明，随着Fe 0/浮石比的降低，长期水力传导率具有明显的可持续性。实际上，纯Fe 0系统在17天后堵塞，而25% Fe 0系统可以运行36天。实验数据证实了设计良好的Fe 0 PRB可以成功去除可还原和不可还原金属物质的观点。
Metallic iron (Fe0) is currently used in subsurface and above-ground water filtration systems on a pragmatic basis. Recent theoretical studies have indicated that, to be sustainable, such systems should not contain more than 60% Fe0(vol/vol). The prediction was already validated in a Fe0/sand system using methylene blue as an operational tracer. The present work is the first attempt to experimentally verify the new concept using pumice particles. A well-characterized pumice sample is used as operational supporting material and is mixed with 200 g of a granular Fe0, in volumetric proportions, varying from 0 to 100%. The resulting column systems are characterized (i) by the time dependent evolution of their hydraulic conductivity and (ii) for their efficiency for the removal of CuII, NiII, and ZnIIfrom a three-contaminants-solution (about 0.3 mM of each metal). Test results showed a clear sustainability of the long term hydraulic conductivity with decreasing Fe0/pumice ratio. In fact, the pure Fe0system clogged after 17 days, while the 25% Fe0system could operate for 36 days. The experimental data confirmed the view that well-designed Fe0PRBs may be successful at removing both reducible and non-reducible metal species.