Reduction of chloride emission by thickening of metallurgical wastewater Krzysztof Słowik, Marcin Stec, Tomasz Iluk, Andrzej Czaplicki and Mateusz Kochel E3S Web Conf., 100 (2019) 00074 Published online: 10 June 2019 DOI: 10.1051/e3sconf/201910000074