Removal and Adsorption of Arsenic in Wastewater by Iron Hydroxide Compound
Removal and Adsorption of Arsenic in Wastewater by Iron Hydroxide Compound
复制标题
氢氧化铁化合物去除吸附废水中的砷
DOI：
10.4144/rpsj.51.181
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发表时间：
2004
期刊：
影响因子：
--
通讯作者：
K. Hashimoto
中科院分区：
文献类型：
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作者：
A. Shibayama;Atsushi Uchida;T. Fujita;K. Hashimoto
由于日本有大量的废弃矿山，砷污染废水的处理是一个重要的问题。通常采用中和铁/铁离子共沉淀法，利用CaCO3、Ca(OH)2、NaOH等去除矿山废水中的砷离子。但是，该工艺存在一些问题：需要大量的碱试剂，产生大量的中和污泥。因此，本研究在实验室开展了氢氧化铁化合物作为砷离子吸附剂的合成研究。研究了氢氧化铁化合物对废弃矿山人工废水（As、SO42-）和实际矿山废水中砷离子的吸附性能。结果表明：(1)氢氧化铁化合物对pH为4 ~ 6的含砷废水具有较高的吸附能力。以实际矿山废水为例，即使在pH值为4的废水中添加1克/升吸附剂，也能达到日本标准规定（0.1 mg/l）的砷离子去除率。结果表明，氢氧化铁化合物对矿山废水中砷的去除效果良好，而不仅仅是共沉淀现象。(2)氢氧化铁化合物对砷离子的最大吸附量为87.32 mg / g。此外，还观察到砷被吸附在氢氧化铁化合物表面。CaCO3与NaOH一样，可以去除实际矿山废水中的砷离子，具有作为碱剂的可行性。
The treatment of wastewater contaminated by arsenic (As) ion is an important issue as a lot of abandoned mines in Japan. Normally, the co-precipitation process with ferric/ferrous ions by neutralization is used to remove arsenic ion from mines wastewater by using CaCO3, Ca(OH)2, NaOH etc. However, the process has some problems: It needs a lot of alkali reagents and produces a lot of the neutralized sludge. Therefore, in this research the synthesis of iron hydroxide compound as absorbent for arsenic ion was developed in our laboratory. The adsorptive properties of the arsenic ion in artificial wastewater (incl. As and SO42-) and practical mine wastewater from abandoned mine were investigated by using the iron hydroxide compound. The results are as follows:(1) The iron hydroxide compound has a high adsorption capacity for the wastewater containing arsenic ion with pH 4 to 6. In case of practical mine wastewater, it could remove the arsenic ion under Japanese standard regulations (0.1 mg/l) even if 1 gram per liter adsorbent was added in the wastewater at pH 4. It indicated that the iron hydroxide compound could achieve high removal performance of arsenic in mine wastewater not only co-precipitation phenomena.(2) The maximum arsenic ion adsorption capacity of iron hydroxide compound was 87.32 mg per gram. In addition, it was observed the arsenic is adsorbed on the surface of iron hydroxide compound. Moreover, the CaCO3 has a feasibility to use as an alkali reagent, as it could remove the arsenic ion from practical mines wastewater, similar with NaOH.