Case Study of Demonstration Project of Typical Chrome Contaminated Sites Remediation

Abstract:

It studied the geological properties and contamination characteristics of soil from contaminated sites of typical chromate plants in western plateau of China. The results indicated that in the shallow part of 0-4m, it was mainly loess-like soil and in the depth of 4-18m, it was mainly gravels and pebbles. The soil had better permeability and ex-situ washing treatment is recommended. The soil was severely contaminated and the concentration of chrome (Ⅵ) was as high as 16,000mg/kg. Based on the analysis, it developed a two-stage demonstration project of countercurrent ex-situ washing plus chemical stabilization with daily capacity of 20m³ soil and a demonstration project of chemical reduction and precipitation plus advanced treatment of filter bed with daily capacity of 200m³ wastewater. After treatment, the concentration of chrome (Ⅵ) in soil was less than 100mg/kg and that in water was reduced to below 0.05mg/L from 1,000mg/L, which can meet the requirements of third-grade groundwater quality standard.

• Periodical: Advanced Materials Research (Volume 414)
• Pages: 203-213
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.414.203
• Online since: December 2011
• Authors: Xing Run Wang, Xiang Hua Yan, Qi Wang
• Keywords: Advanced Treatment of Chrome-Containing Wastewater, Chrome Contaminated Sites, Contamination Characteristics, Soil Ex Situ Treatment

References

[1] JING X. S., CAI M. L., YANG Y. T., Current development on technologies of chromite ore Precessing residue treatment and disposal. ENVIRONMENTAL TECHNOLOGY [J], (3)(2006) 33-35.

[2] REN A. L., GUO B., LIU S. X., Study on the Migration of Chromium in Soil. URBAN ENVIRONMENT&URBAN ECOLOGY [J], 13(2) (2000) 154-157.

[3] ZHANG H., MA D. S., Chromium contamination in the soil from an alloy steel factory in Nanjing. CHINA ENVIRONMENTAL SCIENCZE[J], 17(1) (1997) 80-82.

[4] LUO J. F., QU D., Study on the Soil Cr Pollution in Residue Piling Yard in Qinghai Province. Acta Agriculture Boreali-occidentalis Sinica[J], 15(6) (2006) 244-247.

[5] DERMONT G，BERGERON M，MERCIER G，et al. Soil washing for metal removal: a review of physical / chemical technologies and field applications. J Hazard Materi[J], 152(1) (2008) 1-31.

DOI: 10.1016/j.jhazmat.2007.10.043

[6] WANG X. R., LIU X., YAN X. H., WANG Q., SHU J. M., Selection of Washing Agents for Remediation of Chromium Slag-Contaminated Soil. Research of Environmental Sciences[J], 23(11) (2010) 1405-1409.

[7] PICHTEL J，PICHTEL T M. Comparison of solvents for ex-situ removal of chromium and lead from contaminated soil. Environ Eng Sci[J], 14(2) (1997) 97-104.

DOI: 10.1089/ees.1997.14.97

[8] LIU X., WANG X. R., ZHANG Z. Q., Potential influences of pH and organic matter on the occurrence forms of chromium in chromium-contaminated soils. Chinese Journal ofEnvironmentalEngineering[J], 4(6) (2010) 1436-1440.