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›› 2018, Vol. 35 ›› Issue (5): 617-626.DOI: 10.7523/j.issn.2095-6134.2018.05.008

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Effects of red mud and the combinations on lead, cadmium, and arsenic availability in contaminated soil

SHI Lizheng1, CHEN Huikang2, WU Chuan1, HUANG Liu1, CUI Mengqian1, XUE Shengguo1   

  1. 1. School of Metallurgy and Environment, Central South University, Changsha 410083, China;
    2. SPIC Yuanda Environmental Protection Co., LTD, Chongqing 401122, China
  • Received:2017-01-13 Revised:2017-09-05 Online:2018-09-15

Abstract: The soil incubation experiment was conducted to investigate the effects of red mud, acid-modified red mud, zeolite, gypsum, and ferrous sulfate each and their combinations on the available lead, cadmium, and arsenic concentrations in contaminated soils. The results are showed as follows. In the acid-modified red mud, aluminum, calcium, and iron atoms were further exposed with the changes of surface structures than in the red mud. Additions of 0.5% acid-modified red mud, the combination of red mud and ferrous sulfate, and the combination of acid-modified red mud and zeolite decreased soil available lead contents by 1.96%~76.47%, 4.94%~75.01%, and 5.47%~68.44%, respectively, during the incubation. Additions of the 0.5% acid-modified red mud and the combination of red mud and ferrous sulfate decreased soil available cadmium concentrations with the maximal reductions of 27.78% and 15.04%, respectively. The combination of red mud and gypsum and the combination of red mud and ferrous sulfate were more effective than other amendments in reducing the available arsenic, with reductions of 0.41%, 37.87%, 5.41%, and 3.72% and 55.60%, 13.81%, 37.85%, and 25.36% in 7, 15, 30, and 60 incubation days, respectively. The overall effect of the combination of red mud and ferrous sulfate was the best for the immobilization of lead, cadmium, and arsenic in heavy metal contaminated soils.

Key words: heavy metal contaminated soils, heavy metal availability, red mud, amendments

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