Treatment of acid mine drainage with fly ash: Removal of major contaminants and trace elements

被引:91
作者
Gitari, M. W. [1 ]
Petrik, L. F.
Etchebers, O.
Key, D. L.
Iwuoha, E.
Okujeni, C.
机构
[1] Univ Western Cape, Dept Chem, Environm Remediat Grp, Cape Town, South Africa
[2] Univ Western Cape, Dept Chem, ZA-7535 Bellville, South Africa
[3] Univ Western Cape, Dept Chem, Sensor Res Lab, ZA-7535 Bellville, South Africa
[4] Univ Western Cape, Dept Earth Sci, ZA-7535 Bellville, South Africa
来源
JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART A-TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING | 2006年 / 41卷 / 08期
基金
新加坡国家研究基金会;
关键词
fly ash; acid mine drainage; sulphates; metal ions; scanning electron microscopy-Energy dispersive spectroscopy (SEM-EDS); neutralization;
D O I
10.1080/10934520600754425
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Acid mine drainage (AMD) has been reacted with two South African fly ashes in a batch setup in an attempt to evaluate their neutralization and major, trace elements removal capacity. Different fly ash: acid mine drainage ratios ( FA: AMD) were stirred in a beaker for a set time and the process water analyzed for major, trace elements and sulphate content. The three factors that finally dictated the nature of the final solution in these neutralization reactions were the FA: AMD ratio, the contact time of the reaction and the chemistry of the AMD. Efficiency of the elements removal was directly linked to the amount of FA in the reaction mixture and to the final pH attained. Most elements attained approximate to 100% removal only when the pH of minimum solubility of their hydroxides was achieved (i.e., Mg = 10.49 - 11.0, Cu2+ = 6, Pb2+ = 6 - 7). Dissolution of CaO and subsequent precipitation of gypsum and formation of Al, Fe oxyhydroxysulphates, Fe oxyhydroxides with subsequent adsorption of sulphate contributed to the sulphate attenuation. Significant leaching of B, Sr, Ba and Mo was observed as the reaction progressed and was observed to increase with quantity of fly ash in the reaction mixture. However B was observed to decrease at high FA: AMD ratios probably as result of co-precipitation with CaCO3(s).
引用
收藏
页码:1729 / 1747
页数:19
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