title: Biological phosphorus removal inhibition by roxarsone in batch culture systems.
abstract: Roxarsone has been extensively used in the feed of animals, which is usually excreted unchanged in the manure and eventually enter into animal wastewater, challenging the biological phosphorus removal processes. Knowledge of its inhibition effect is key for guiding treatment of roxarsone-contaminated wastewater, and is unfortunately keeping unclear. We study the inhibition of roxarsone on biological phosphorus removal processes for roxarsone-contaminated wastewater treatment, in terms of the removal and rates of chemical oxygen demand (COD), phosphate. Results showed that presence of roxarsone considerably limited the COD removals, especially at roxarsone concentration exceeding 40 mg L(-1). Additionally, roxarsone inhibited both phosphorus release and uptake processes, consistent with the phosphate profiles during the biological phosphorus removal processes; whereas, roxarsone is more toxic to phosphorus uptake process, than release function. The results indicated that it is roxarsone itself, rather than the inorganic arsenics, inhibit biological phosphorus removal processes within both aerobic and anaerobic roxarsone-contaminated wastewater treatment.
authors.affiliation: Department of Civil Engineering, Hefei University of Technology, Hefei 230009, China.
authors.forename: Qingfeng
authors.initials: Q
authors.lastname: Guo
authors.forename: Li
authors.initials: L
authors.lastname: Liu
authors.forename: Zhenhu
authors.initials: Z
authors.lastname: Hu
authors.forename: Guowei
authors.initials: G
authors.lastname: Chen
mesh_terms: D000332:Aerobiosis / Q000187:drug effects; D000693:Anaerobiosis / Q000187:drug effects; D000900:Anti-Bacterial Agents / Q000737:chemistry* / Q000633:toxicity; D001419:Bacteria / Q000187:drug effects / Q000378:metabolism; D061249:Batch Cell Culture Techniques; D057919:Biological Oxygen Demand Analysis; D010758:Phosphorus / Q000737:chemistry / Q000378:metabolism*; D012406:Roxarsone / Q000737:chemistry* / Q000633:toxicity; D012722:Sewage / Q000382:microbiology; D014865:Waste Disposal, Fluid; D062065:Wastewater / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000737:chemistry* / Q000633:toxicity
chemical_list: D000900:Anti-Bacterial Agents; D010758:Phosphorus; D012406:Roxarsone; D012722:Sewage; D062065:Wastewater; D014874:Water Pollutants, Chemical