Ex situ model remediation and assessment of the enzymatic activity of forest podzolic soils under high oil pollution

About the author:

Dmitriy V. Tarabukin, Cand. Sci. (Biol.), Researcher, Institute of Biology, Komi Scientific Center, Ural Branch of the Russian Academy of Sciences (Syktyvkar); dvtarabukin@ib.komisc.ru

Abstract:

This article presents model experiments on the ex situ remediation of forest podzolic soil polluted with oil, where various stimulating factors were tested. The author has used the following factors to accelerate the decomposition of oil in the soil: high humidity, temperature, non-ionic surfactant, and mineral fertilizers. The oil content in the soil samples was measured 30 and 60 days after the start of remediation.

The results show no significant differences (p>0.05) in the content of oil products between different biostimulation options. The author concludes that the selected soil type is resistant to oil pollution and has a significant potential for self-recovering under favorable conditions.

Variations in cellulase and protease activity in the soil occurred during various periods of remediation. There was no cellulase activity 30 and 60 days after the oil was introduced into the soil in the two cases: a) when simulating self-recovery and b) with the addition of surfactants. However, cellulase activity remained quite high in the experiments with the addition of mineral fertilizers. Protease activity was present in the soil in all biostimulation options, though it had a lower value compared to the control.

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