title: Nitrogen and phosphorus removal from wastewater treatment plant effluent via bacterial sulfate reduction in an anoxic bioreactor packed with wood and iron.
abstract: We investigated the removal of nitrogen and phosphate from the effluent of a sewage treatment plant over a long-term operation in bioreactors packed with different combinations of wood and iron, with a trickling filter packed with foam ceramics for nitrification. The average nitrification rate in the trickling filter was 0.17 kg N/m3∙day and remained at 0.11 kg N/m3∙day even when the water temperature was below 15 °C. The denitrification and phosphate removal rates in the bioreactor packed with aspen wood and iron were higher than those in the bioreactor packed with cedar chips and iron. The bioreactor packed with aspen wood and iron continued to remove nitrate and phosphate for >1200 days of operation. The nitrate removal activity of a biofilm attached to the aspen wood from the bioreactor after 784 days of operation was 0.42 g NO3-N/kg dry weight wood∙ day. There was no increase in the amount of dissolved organic matter in the outflow from the bioreactors.
authors.affiliation: NARO Institute of Livestock and Grassland Science, National Agriculture and Food Research Organization, 2 Ikenodai, Tsukuba, Ibaraki 305-0901, Japan. yamatktk@affrc.go.jp.
authors.forename: Takahiro
authors.initials: T
authors.lastname: Yamashita
authors.affiliation: Institute of Science and Engineering, Kanazawa University, Kakuma-machi, Kanazawa, Ishikawa 920-1192, Japan. rikemoto@se.kanazawa-u.ac.jp.
authors.forename: Ryoko
authors.initials: R
authors.lastname: Yamamoto-Ikemoto
mesh_terms: D000693:Anaerobiosis; D001419:Bacteria / Q000378:metabolism*; D019149:Bioreactors; D005374:Filtration; D007501:Iron / Q000737:chemistry; D009584:Nitrogen / Q000378:metabolism*; D010084:Oxidation-Reduction; D010758:Phosphorus / Q000378:metabolism*; D013431:Sulfates / Q000378:metabolism*; D014865:Waste Disposal, Fluid / Q000379:methods*; D062065:Wastewater / Q000382:microbiology; D014874:Water Pollutants, Chemical / Q000378:metabolism*; D014934:Wood / Q000737:chemistry
chemical_list: D007501:Iron; D009584:Nitrogen; D010758:Phosphorus; D013431:Sulfates; D062065:Wastewater; D014874:Water Pollutants, Chemical