Environmentally-efficient approaches to oil and gas producing sites Mykhailo Liakh, Teodoziia Yatsyshyn, Svitlana Gavryliv, Yuriy Gavryliv, Lesia Shkitsa, Katarina Monkova, Peter Pavol Monka and Vasyl-Danylo Liakh E3S Web Conf., 280 (2021) 09002 Published online: 30 June 2021 DOI: 10.1051/e3sconf/202128009002