«Environmental protection in oil and gas complex»

Assessment of the detoxifying ability of humic acids in relation to hexavalent chromium in drilling sludge

UDC: 544.77.052.5
DOI: -

Authors:

¹ Tula State University, Tula, Russia
² National University of Oil and Gas "Gubkin University", Moscow, Russia

Keywords: heavy metals, humic acids, detoxification, biological testing, chromium (VI), biosorption, drilling sludge, oil and gas complex, ecology

Annotation:

When studying problem of environmental pollution with hexavalent chromium Cr(VI), it was found that its sources are spent drilling fluids and sludge pits. The mechanisms of toxic effects of Cr(VI) on living organisms are analyzed. The possibility of using humic acids of reed lowland peat as an environmentally friendly detoxifier is considered. The detoxifying capacity of humic acids of reed lowland peat in relation to Cr(VI) in aquatic and soil environments was studied by the biological testing method using duckweed and garden cress as test objects. It was determined that at a Cr(VI) concentration of 25 MAC (maximum allowable concentration) in the aquatic environment, toxicity decreased from 69 to 6 % in the presence of humic acids of reed lowland peat. It was revealed that in inert soil the maximum reduction in Cr(VI) toxicity was observed at a concentration of 10 MAC making 20 %. The calculated detoxification coefficients showed that the maximum value of D was 91 % in the aquatic environment at a Cr(VI) concentration of 25 MAC. It was shown that humic acids of reed lowland peat are capable of reducing the toxicity of Cr(VI) by reducing it to trivalent chromium Cr(III) and forming non-toxic complexes. Recommendations for using humic acids of reed lowland peat in remediation measures to minimize secondary pollution by chromium-containing drilling sludge are proposed.

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