TY CONF TI CARBON SORBENTS FROM SEWAGE SLUDGE FOR PURIFICATION OF WATER FROM COPPER IONS KW carbon sorbents KW sewage sludge KW sorption KW copper ions KW water treatment KW ecology JO ENERGY-SAVING AND ENVIRONMENTALLY SAFE TECHNOLOGIES OF THE TIMBER INDUSTRY – 2025 AU Molchanova, O.N. AU Novikova, L.A. AU Tomina, E.V. AU Zhuzhukin, K.V. PY 2025 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov