title: Partial nitrification of ammonium-rich wastewater as pretreatment for anaerobic ammonium oxidation (Anammox) using membrane aeration bioreactor.
abstract: A lab-scale membrane aeration bioreactor (MBR) system was developed for treating synthetic ammonium-rich wastewater to yield an appropriate NO(2)(-)/NH(4)(+) mixture as a pretreatment for anaerobic ammonium oxidation (Anammox). The effluent with a suitable NO(2)(-)/NH(4)(+) ratio (1:1 to 1:1.3) was obtained in 24 h using the developed MBR system under suitable conditions. Additionally, the control of bulk dissolved oxygen (DO) level under a desired condition (anoxic condition) was easier and more economical than traditional aeration systems. An optimal initial alkalinity of 1500 mg CaCO(3)l(-1) was necessary for achieving 50% partial nitrification of wastewater with an initial ammonium concentration of 510 mg NH(4)-N l(-1) within 24 h. Furthermore, there is no need for pH adjustment by adding a base or an acid throughout the reaction if the initial alkalinity is appropriately controlled. Both the appropriate NO(2)(-)/NH(4)(+) ratio and the low DO level make this MBR system an ideal system for Anammox.
authors.affiliation: Graduate Institute of Environmental Engineering, National Taiwan University, 71 Chou-Shan Rd., Taipei, Taiwan, ROC.
authors.forename: Yu-Jou
authors.initials: YJ
authors.lastname: Feng
authors.forename: Szu-Kung
authors.initials: SK
authors.lastname: Tseng
authors.forename: Tsung-Hui
authors.initials: TH
authors.lastname: Hsia
authors.forename: Chun-Ming
authors.initials: CM
authors.lastname: Ho
authors.forename: Wen-Po
authors.initials: WP
authors.lastname: Chou
mesh_terms: D001421:Bacteria, Anaerobic / Q000378:metabolism*; D019149:Bioreactors / Q000382:microbiology*; D007220:Industrial Waste / Q000517:prevention & control; D008567:Membranes, Artificial; D009566:Nitrates / Q000378:metabolism*; D009573:Nitrites / Q000378:metabolism*; D010084:Oxidation-Reduction; D000644:Quaternary Ammonium Compounds / Q000302:isolation & purification / Q000378:metabolism*; D014874:Water Pollutants, Chemical / Q000378:metabolism*; D018508:Water Purification / Q000379:methods
chemical_list: D007220:Industrial Waste; D008567:Membranes, Artificial; D009566:Nitrates; D009573:Nitrites; D000644:Quaternary Ammonium Compounds; D014874:Water Pollutants, Chemical