Total immobilization of soil heavy metals with nano-Fe/Ca/CaO dispersion mixtures
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- 作者：Srinivasa Reddy Mallampati (1)
Yoshiharu Mitoma (1)
Tetsuji Okuda (2)
Shogo Sakita (1)
Mitsunori Kakeda (1) - 关键词：Heavy metals ; Immobilization ; Separation ; Soil remediation ; Nano ; Fe/Ca/CaO ; Volume reduction
- 刊名：Environmental Chemistry Letters
- 出版年：2013
- 出版时间：June 2013
- 年：2013
- 卷：11
- 期：2
- 页码：119-125
- 全文大小：363KB
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Yoshiharu Mitoma (1)
Tetsuji Okuda (2)
Shogo Sakita (1)
Mitsunori Kakeda (1)
1. Department of Environmental Sciences, Faculty of Life and Environmental Sciences, Prefectural University of Hiroshima, 562 Nanatsuka-Cho, Shobara City, Hiroshima, 727-0023, Japan
2. Environmental Research and Management Center, Hiroshima University, 1-5-3 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8513, Japan - ISSN：1610-3661
文摘
This report shows that soil heavy metals can be totally immobilized by grinding with nano-Fe/Ca/CaO. Remediation of soils contaminated by heavy metals is a critical issue in Japan. Indeed, contaminated soils are notoriously difficult to remediate using available technologies. Major setbacks in typical immobilization techniques for heavy metals are wet conditions, forming secondary effluents and further treatment for effluents. Solidification with nano-Fe/Ca/CaO dispersion mixture is a promising treatment for the total immobilization of soil heavy metals As, Cd, Cr, Pb, and separation in dry conditions. Here, we studied the heavy metal immobilization by simple grinding with the addition of three mixtures: nano-Fe/CaO, nano-Fe/Ca/CaO, and nano-Fe/Ca/CaO/PO4. Samples were analyzed by inductively coupled plasma optical emission spectrometry (ICP-OES) and scanning electron microscopy combined with electron dispersive spectroscopy (SEM–EDS). Results show that the addition of nano-Fe/Ca/CaO immobilized 95-9?% of heavy metals, versus 65-0?% by simple grinding. After treatment, 36-5 wt% of magnetic and 64-5 wt% of nonmagnetic fractions of soil were separated. Their condensed heavy metal concentration was 85-5?% and 10-0?%, respectively. Nano-Fe/Ca/CaO treatment reduced the concentration of leachates heavy metals to values lower than the Japan soil elution standard regulatory threshold of 0.01?mg/l for As, Cd, and Pb; and 0.05?mg/l for Cr. This technology can therefore immobilize totally soil heavy metals and reduce heavy metal by separation.