biostudies-literatureTanmoy DSNIEHS NIH HHS134058https://www.ebi.ac.uk/biostudies/studies/S-EPMC12434645biostudies-literatureUnknown296Anammox is gaining popularity for treating wastewater containing high-strength ammonia due to lower energy demand compared to conventional nitrification-denitrification processes; however, anammox is reported to increase nitrate loads in the effluent. The objective of this study was to assess the applicability of recycled materials [recycled concrete aggregate (RCA) and rice husks (RH)] as a polishing step to improve anammox reactor effluent quality. Anammox effluents were separately passed through two single-stage columns containing RCA and RH, and one two-stage column (50% RCA, 50% RH) to quantify total N, ammonia, nitrate, nitrite, and phosphate removal efficiencies. Langmuir isotherm experiments were conducted to quantify nitrate, nitrite, and phosphate sorption capacities in the columChemosphereThe use of recycled materials in a biofilter to polish anammox wastewater treatment plant effluent.PMC12434645P30 ES005605LeFevre GHBezares-Cruz JCTanmoy DSfalseThe use of recycled materials in a biofilter to polish anammox wastewater treatment plant effluent.Anammox is gaining popularity for treating wastewater containing high-strength ammonia due to lower energy demand compared to conventional nitrification-denitrification processes; however, anammox is reported to increase nitrate loads in the effluent. The objective of this study was to assess the applicability of recycled materials [recycled concrete aggregate (RCA) and rice husks (RH)] as a polishing step to improve anammox reactor effluent quality. Anammox effluents were separately passed through two single-stage columns containing RCA and RH, and one two-stage column (50% RCA, 50% RH) to quantify total N, ammonia, nitrate, nitrite, and phosphate removal efficiencies. Langmuir isotherm experiments were conducted to quantify nitrate, nitrite, and phosphate sorption capacities in the colum2022-01-01T00:00:00Z2022 Jun2026-06-01T06:24:22.664Z2026-04-08T09:44:18.255ZS-EPMC124346453519285410.1016/j.chemosphere.2022.134058