Transport and fate of hexavalent chromium in slag–soil system
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The transport and fate of hexavalent chromium Cr(VI) in slag–soil system, which remain poorly understood, are of great importance for environmental risk assessment and pollution control of Cr(VI) in soil and groundwater. Based on the migration behavior of Cr(VI) in the chromium-containing slag under the effects of rainfall, the transport and fate of Cr(VI) in soil were investigated. Batch and column experiments were undertaken to clarify the Cr(VI) adsorption and transport behavior of aqueous Cr(VI) in soil, respectively. Findings from a combination of experimental and model results clearly suggest that the adsorption of Cr(VI) onto soil is a spontaneous chemical adsorption process. For chromium-soil transport system, the constructed HYDRUS-1D dynamics model is a good simulation for Cr(VI) migration in soil, as the modeling yielded adequate fit for simulated and measured values of Cr(VI) concentration in soil (correlation coefficient R2 = 0.99). The transport modeling then was utilized to assess the transport of Cr(VI) in slag–soil system. Up to the year of 2018, the concentration levels of Cr(VI) in the soil-leaching solution attained 905 mg/L. Due to the thin layer of soil and the high mobility of Cr(VI) in soil, it is no doubt that the Cr(VI) leaching will engender serious pollution of soil and groundwater in the presence of precipitation. The applications and limitations of the HYDRUS-1D were also discussed, such as bacteria transport, more elaborate biogeochemical processes, coupling of vadose zone processes with existing larger scale groundwater flow models.
KeywordsCr(VI) Transport Slag–soil system Modeling
This work was supported by the National Natural Science Foundation of China [No. 51204074], Pearl River S&T Nova Program of Guangzhou, China [No. 201710010065], Major Science and Technology Program for Water Pollution Control and Treatment [No. 2017ZX07101003], the China Scholarship Council [201808440005, 201806715037], the National Environmental Protection Public Welfare Industry Targeted Research Fund [No. PM-zx703-201701-058 and PM-zx913-201805-132], the Fundamental Research Funds for the Central Universities (Granted: 2014B16814), and Zhaoqing City Science and Technology Innovation Project (2017S002).
- Akyol NH, Yolcubal I (2007) Retention and transport of hexavalent chromium in calcareous karst soils. Turk J Earth Sci 16:363–379Google Scholar
- Banerjee M, Mishra S, Chatterjee J (2005) Scavenging of nickel and chromium toxicity in Aulosira fertilissima by immobilization: effect on nitrogen assimilating enzymes. Electron J Biotechnol 7:1250–1259Google Scholar
- Boone RD, Grigal DF, Sollins P, Ahrens RJ, Armstrong DE, Robertson GP, Coleman DC, Bledsoe CS, Sollins P (1999) Soil sampling, preparation, archiving and quality control. Standard soil methods for long-term ecological research. Oxford University Press, New York, pp 3–28Google Scholar
- Dube A, Zbytniewski R, Kowalkowski T, Cukrowska E, Buszewski B (2001) Adsorption and migration of heavy metals in soil. Pol J Environ Stud 10:1–10Google Scholar
- Freundlich H (1906) Uber die adsorption in Losungen, Zeitschrift fur Physikalische Chemie. Jamchemsoc 62:121–125Google Scholar
- Hendershot W, Lalande H, Duquette M (1993) Ion exchange and exchangeable cations. J Sci Soil Manure Jpn 32:601–604Google Scholar
- Hoskins B, Ross D (2012) Soil sample preparation and extraction. Commun Soil Sci Plant Anal 28:551–559Google Scholar
- Li Y (2004) Study on chromium contaminated soils and waters around a chromate factory. Heavy Metals Poster Session. University of Massachusetts, Boston, pp 10–21Google Scholar
- Liu ZC (1991) Pollution and control of groundwater system. China Environmental Science Press, BeijingGoogle Scholar
- Tinsley J (1950) The determination of organic carbon in soils by dichromate mixtures. Trans Intcongsoil Sci:161–164Google Scholar
- Wladyslaw R, Wojciech P (2006) Kinetics of solute adsorption at solid/solution interfaces: a theoretical development of the empirical pseudo-first and pseudo-second order kinetic rate equations, based on applying the statistical rate theory of interfacial transport. J Phys Chem B 110:16514–16525CrossRefGoogle Scholar