https://www.efecon.tuiasi.ro/research-article/comparison-of-thermochemical-treatment-of-sewage-sludge-ash-with-sodium-sulphate-in-laboratory-scale-and-pilot-scale-experiments/ EFECON Sun, 22 May 2022 17:37:10 +0000 hourly 1 https://wordpress.org/?v=6.1.1