RETRACTED: Overview of modern methods of treatment and disposal of sewage sludge Kamshat Jumasheva, Samal Syrlybekkyzy, Akmaral Serikbayeva, Botakoz Suleimenova and Zhansaule Altybayeva E3S Web Conf., 420 (2023) 07008 Published online: 04 September 2023 DOI: 10.1051/e3sconf/202342007008