Investigation of materials for reactive permeable barrier in removing cadmium and chromium(VI) from aquifer near a solid domestic waste landfill

• Published in: Environmental science and pollution research international Vol. 28; no. 4; pp. 4645 - 4659
• Main Authors: Safonov, Alexey, Popova, Nadezhda, Andrushenko, Natalia, Boldyrev, Kirill, Yushin, Nikita, Zinicovscaia, Inga
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 2021; Springer Nature B.V
• Subjects: Adsorption; Aquatic Pollution; Aquifers; Atmospheric Protection/Air Quality Control/Air Pollution; Biofilms; Cadmium; Chromium; Chromium - analysis; Earth and Environmental Science; Ecotoxicology; Environment; Environmental Chemistry; Environmental Health; Environmental science; Groundwater; Household wastes; Hydrogen-Ion Concentration; Ion exchange; Ions; Kinetics; Landfill; Landfills; Perlite; Raw materials; Research Article; Solid Waste; Solid wastes; Sorbents; Sorption; Vermiculite; Waste Disposal Facilities; Waste disposal sites; Waste Water Technology; Water Management; Water Pollutants, Chemical - analysis; Water Pollution Control; Zeolites; Waste landfills; Cadmium; Sorption natural materials; Microbial biofilms; Chromate; Bioreduction; Permeable reactive barrier; Geochemical modeling
• ISSN: 0944-1344; 1614-7499
• DOI: 10.1007/s11356-020-10743-x

The sorption characteristics of raw and biofilm-coated materials: vermiculite, lightweight expanded clay aggregate (LECA), perlite, zeolite, and shungite toward Cd and Cr(VI) ions were investigated to evaluate the possibility of their use as filtration barrier in the aquifer near a solid domestic waste landfill. The effectiveness of Cr(VI) removal by the raw materials changed in the following order: shungite > zeolite > perlite > vermiculite > LECA and for Cd: zeolite > shungite > vermiculite > perlite > LECA. After biofilm formation on the surface of the materials, the sorption capacity increased in some (perlite, LECA), while in others (zeolite) it was reduced. Four kinetic models were used to describe the experimental data. Mechanisms of metal removal were proposed: for Cr(VI), a characteristic combination of sorption processes was suggested, while the removal of Cd ions could occur by ion exchange and by complexation on the surface of the sorbent. Cr(VI) reduction by living bacterial cells forming a biofilm on the sorbent surface was assessed.