THE INFLUENCE OF POLLUTED SOIL AERATION IN THE PROCESS OF IN SITU BIOLEACHING

Ioana Monica  SUR; Valer  MICLE; Timea  GABOR

Authors

Ioana Monica SUR Department of Environmental Engineering and Sustainable Development Entrepreneurship, Faculty of Materials and Environmental Engineering, Technical University, Cluj-Napoca, Romania. Email: imberar@mail.utcluj.ro. https://orcid.org/0000-0002-3275-5745
Valer MICLE Department of Environmental Engineering and Sustainable Development Entrepreneurship, Faculty of Materials and Environmental Engineering, Technical University, Cluj-Napoca, Romania Email: valer.micle@imadd.utcluj.ro. https://orcid.org/0000-0003-1102-4537
Timea GABOR Department of Environmental Engineering and Sustainable Development Entrepreneurship, Faculty of Materials and Environmental Engineering, Technical University, Cluj-Napoca, Romania. Email: timea.gabor@imadd.utcluj.ro. https://orcid.org/0000-0003-2568-1239

Keywords:

bioleaching, contaminated soils, heavy metals, in situ, microorganisms

Abstract

The influence of aeration of soils polluted with heavy metals by using Thiobacillus-type microorganisms was studied using soil samples contaminated with heavy metals (Cu 4074 - 7550 mgkg^-1, Zn 5870 - 9310 mgkg^-1, Cd 36-50 mgkg^-1, Pb 15000 - 42890 mgkg^-1), from Romplumb, Baia Mare. The variation of the metal concentration extracted by bioleaching and aerated bioleaching was monitored for 16 weeks. The soil samples treated by bioleaching (Cu: 9 - 53%; Zn: 9 - 62%; Cd: 9 - 24%. Pb: 31 - 71%) have obtained a lower efficiency than the soil samples treated by aerated bioleaching (Cu: 34 - 70%; Zn: 36 - 76%; Cd: 17 - 38%. Pb: 44 - 78%), but there are percentage differences between the two processes (Cu: 17 - 27%; Zn: 14 - 27%; Cd: 8 - 14%, Pb: 7 - 13%).

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