Summary. The aim of the study was to identify the innovative filters' (textile filters for wastewater treatment) thickness impact on dissolved compounds removal efficiency and related: biomass concentration, hydraulic capacity and hydraulic retention time. The study was conducted on septic tank effluent (STE) which was filtered at changeable wastewater surface between 7 cm and 20 cm of height under hydrostatic pressure. The research was performed on filters of thickness: 1.8 mm, 3.6 mm and 7.2 mm. The thinner the filter layer, the lower the total solids content and the higher the hydraulic capacity. The thicker the filter layer, the higher the dissolved compounds removal efficiency. The most efficient in removal were the thickest (eight-layers) filters. The calculated hydraulic retention times were: 0.5, 1.1 and 3.3 h for two-, four-and eight-layer filters, respectively.
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