Impacts of pH and ammonia on the leaching of Cu(II) and Cd(II) from coal fly ash

Chemosphere
Jianmin WangKen Ladwig

Abstract

Many coal-fired power plants are implementing ammonia-based technologies to reduce NO(x) emissions. Excess ammonia in the flue gas often deposits on the coal fly ash. Ammonia can form complexes with many heavy metals and change the leaching characteristics of these metals. This research tends to develop a fundamental understanding of the ammonia impact on the leaching of some heavy metals, exemplified by Cu(II) and Cd(II), under different pH conditions. Batch results indicated that the adsorption is the main mechanism controlling Cu(II) and Cd(II) leaching, and high concentrations of ammonia (>5,000 mg/l) can increase the release of Cu(II) and Cd(II) in the alkaline pH range. Based on the chemical reactions among fly ash, ammonia, and heavy metal ion, a mathematical model was developed to quantify effects of pH and ammonia on metal adsorption. The adsorption constants (logK) of Cu(2+), Cu(OH)(+), Cu(OH)(2), and Cu(NH(3))(m)(2+) for the fly ash under investigation were respectively 6.0, 7.7, 9.6, and 2.9. For Cd(II), these constants were respectively 4.3, 6.9, 8.8, and 2.6. Metal speciation calculations indicated that the formation of less adsorbable metal-ammonia complexes decreased metal adsorption, therefore enhanced metal le...Continue Reading

References

Jan 27, 2005·Environmental Science & Technology·Jianmin WangHeng Ban

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Citations

Jun 18, 2014·Environmental Science. Processes & Impacts·Guo-Hua ZhaoYong-Jun Zhao
Aug 13, 2010·Waste Management·Amr S MeawadYoncho G Pelovski
Sep 25, 2009·Journal of Hazardous Materials·Yelong ZhaoGuiling Ning
Apr 28, 2009·Journal of Hazardous Materials·S Mohan, R Gandhimathi
Jul 3, 2007·Chemosphere·Jianmin WangKen Ladwig
Aug 26, 2015·Environmental Science and Pollution Research International·Pooja KandimallaHimabindu Vurimindi
Aug 26, 2014·Waste Management & Research : the Journal of the International Solid Wastes and Public Cleansing Association, ISWA·Zhenzhen GuanThomas Fruergaard Astrup
Feb 5, 2008·Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes·Qiansheng LiYuncong Li
Apr 20, 2010·Journal of Environmental Quality·Alex DellantonioWalter W Wenzel
Mar 17, 2019·Environmental Science and Pollution Research International·Mahsa MohseniFiruzmehr Mazaheri
Jun 10, 2017·Environmental Science and Pollution Research International·Hailing HeBo Yue
Apr 24, 2020·Reviews on Environmental Health·Kristina M Zierold, Chisom Odoh
Mar 28, 2021·Ecotoxicology and Environmental Safety·Dong XuFuhao Liu

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