@ARTICLE{Jamrozik_Aleksandra_Microbial_2020, author={Jamrozik, Aleksandra and Żurek, Roman and Gonet, Andrzej and Wiśniowski, Rafał}, volume={vol. 46}, number={No 4}, pages={33-41}, journal={Archives of Environmental Protection}, howpublished={online}, year={2020}, publisher={Polish Academy of Sciences}, abstract={Operations conducted by petroleum industry generate an entire range of drilling waste. The chemical composition of drilling waste and its toxicity depend primarily on the geological and technological conditions of drilling, the type of drilled rock deposits and on the type and composition of the drilling mud used. In the course of drilling operations, drilling fluids are in constant contact with bacteria, fungi and other organisms infecting the mud. Pioneer species, capable of surviving and using the resources of this specific environment, are selected. For this reason, the effectiveness of microbiota survival on different types of spent drilling muds and in different dilutions with brown soil was measured. Spent drilling muds samples came from drilling operations in various regions of Poland, e.g. Subcarpathia, the Polish Lowland and Pomerania regions. Oxygen consumption after 96 h was around 20 μg·g‒1 dry mass in soil or soil/drilling water-based mud mixture. Soil mixes contained 10 wt% synthetic base, mud had a higher oxygen consumption – 38 μg · g‒1 dry mass. Oxygen consumption decreases sharply as the content of the spent synthetic base mud fraction increases. A higher concentration of spent SBM (35 wt%) reduced the aerobic metabolism by slightly more than 50%. A high concentration of reduced carbon decreased the respiratory quotient (RQ) value to 0.7. All the researched drilling waste shows microbiological activity. At the full concentration of drilling fluids and non-dilution options, the chemical composition (salinity, inhibitors, etc.) strongly inhibits microbiota development and consequently, respiration}, type={Article}, title={Microbial metabolic activity of drilling waste}, URL={http://www.czasopisma.pan.pl/Content/118692/PDF/Archives%20vol%2046%20no%204pp33-41.pdf}, doi={10.24425/aep.2020.135762}, keywords={respiration, oxygen consumption, drilling fluid, drilling waste, spent drilling mud}, }