TY JOUR TI Ways to Improve the Efficiency of Wastewater Treatment KW wastewater disposal systems KW wastewater treatment KW efficiency improvement KW storage tanks KW grids KW aerated sand traps KW settling tanks KW thin-layer blocks KW aerotanks KW aftertreatment JO Proceedings of Petersburg Transport University AU Paramonova, L.N. PY 2024 IS 21 PB FSBEI HE "Emperor Alexander I St. Petersburg State Transport University"