Use of a water treatment sludge in a sewage sludge dewatering process Justyna Górka, Małgorzata Cimochowicz-Rybicka and Małgorzata Kryłów E3S Web Conf., 30 (2018) 02006 Published online: 06 February 2018 DOI: 10.1051/e3sconf/20183002006