Abstract
Drill cuttings is a complex mixture of spent drilling mud with various additives having different chemical properties and drilled solids, and which significantly pollutes the environment when it is buried. This article proposes and studies a zeolite-based composite mixture that converts drill cuttings into environmentally friendly soil. As a result of the experiment, samples of model drill cuttings and soil with different holding times are obtained. A sequential extraction method is used to determine the degree of metal desorption in a laboratory study of samples. The analysis consists of an estimation of metals content (gross form and extracts in 3 extractants), the content of petroleum products and pH value. Concentrations of metals in both gross and mobile form in the processed drill cuttings have significantly decreased in comparison with the original drill cuttings, and do not exceed standard values. Also, oil concentration in the soil is lower than in the drill cuttings. pH reaction has decreased from alkaline to neutral. The proposed zeolite-containing composite mixture allows implementing drill cuttings as a new, sustainable in the environment, useful product.
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