Implementation of the cascade waste use principle by application of sewage sludge on lands disturbed by mining operationsOleh Skrypnyk, Liliya Uvarova, Leonyd Yakubenko, Nataliya Ilchenko and Sergey OgorodnikovE3S Web Conf., 280 (2021) 08007DOI: https://doi.org/10.1051/e3sconf/202128008007