STUDY ON LEACHED CHARACTERISTICS AND STABILITY OF HEAVY METAL IN CEMENTED MIXED SLUDGE

BAI Xiangyu; LI Shunqun; ZHANG Wei

doi:10.13204/j.gyjzG21060210

Volume 51 Issue 11

Mar. 2022

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BAI Xiangyu, LI Shunqun, ZHANG Wei. STUDY ON LEACHED CHARACTERISTICS AND STABILITY OF HEAVY METAL IN CEMENTED MIXED SLUDGE[J]. INDUSTRIAL CONSTRUCTION, 2021, 51(11): 149-153,185. doi: 10.13204/j.gyjzG21060210

Citation:

BAI Xiangyu, LI Shunqun, ZHANG Wei. STUDY ON LEACHED CHARACTERISTICS AND STABILITY OF HEAVY METAL IN CEMENTED MIXED SLUDGE[J]. INDUSTRIAL CONSTRUCTION, 2021, 51(11): 149-153,185. doi: 10.13204/j.gyjzG21060210

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STUDY ON LEACHED CHARACTERISTICS AND STABILITY OF HEAVY METAL IN CEMENTED MIXED SLUDGE

doi: 10.13204/j.gyjzG21060210

1. School of Civil Engineering and Architecture, Xinxiang College, Xinxiang 453003, China;
2. School of Civil Engineering, Tianjin Chengjian University, Tianjin 300384, China

Received Date: 2021-06-02
Available Online: 2022-03-29

Abstract

Abstract

Taking river sludge polluted by heavy metal as research objects, using cement as cementitious material, industrial waste fly ash and mineral powder as auxiliary cementitious materials, AlCl₃, gypsum as the admixture, the polluted sludge was cemented and the leaching tests were conducted on cemented specimens. The optimum proportion for cemented specimens of the minimum leached concentration of heavy metals was selected by the single mixing experiment and orthogonal experiment. The specimens cemented prepared by the optimal proportion were performed long-age curing tests and freeze-thaw tests. The results showed that when the AlCl₃ content was 4% and curing age was 1 d, the water content of specimens decreased obviously. When the content of cement, mineral powder, fly ash and gypsum in specimens was respectively 12%, 14%, 6% and 0.4%, the leached concentration of Ni, Cd, Pb and Hg from spcimens decreased by 78.04%, 85.78%, 67.79% and 90.00%. The leached concentrations of Ni, Cd, Pb and Hg from specimens respectively decreased by 74.26%, 83.75%, 62.27% and 88.62% after 200 freeze-thaw cycles. The leached concentrations of Ni, Cd, Pb and Hg from specimens decreased by 85.42%, 90.29%, 78.84% and 92.83% respectively, when specimens were cured for 300 d. The results showed that the leached concentrations of heavy metals from specimens met the requirements of Specifications Planting Soil for Greening(CJ/T 340-2016) and the cemented soil had a good performance of stabilizing heavy metals.
- cemented heavy metal,
- sludge,
- long-age,
- industrial waste,
- freeze-thaw cycle

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References(20)

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