Reuse of ferric sludge as an iron source for the Fenton-based process in wastewater treatmentBolobajev, Juri; Kattel, Eneliis; Viisimaa, Marika; Goi, Anna; Trapido, Marina; Tenno, Taavo; Dulova, NiinaChemical engineering journal2014 / p. 8-13 : ill Treatment of high-strength wastewater by Fe2+-activated persulphate and hydrogen peroxideKattel, Eneliis; Dulova, Niina; Viisimaa, Marika; Tenno, Taavo; Trapido, MarinaEnvironmental technology2016 / p. 352-359 : ill http://doi.org/10.1080/09593330.2015.1069899