title: Nutrient removal and phosphorus recovery performances of a novel anaerobic-anoxic/nitrifying/induced crystallization process.
abstract: An anaerobic-anoxic/nitrifying (A(2)N) two sludge process coupled with induced crystallization (IC) called A(2)N-IC process was developed for wastewater nutrient removal and phosphorus recovery. The performances of A(2)N-IC process in comparison with A(2)N process at different COD to phosphorus (COD/P) feeding ratios were investigated. The results indicated that A(2)N-IC achieved not only high and stable nutrient removal but also phosphorus recovery. Calcium phosphorus crystals were formed in the crystallization reactor in A(2)N-IC. Moreover, the incorporation of chemical induced crystallization improved biological phosphorus removal. In A(2)N-IC process, phosphorus removal efficiency was consistently maintained at 99.2%, whereas in A(2)N it decreased from 93.0% to 65.7% with the decrease of feeding COD/P ratio. The COD and ammonia removal efficiencies were regardless of feeding COD/P ratio in the two processes.
authors.affiliation: School of Energy and Environment, Southeast University, Sipailou Road, Nanjing 210096, PR China.
authors.forename: Jing
authors.initials: J
authors.lastname: Shi
authors.forename: Xiwu
authors.initials: X
authors.lastname: Lu
authors.forename: Ran
authors.initials: R
authors.lastname: Yu
authors.forename: Wentao
authors.initials: W
authors.lastname: Zhu
mesh_terms: D000641:Ammonia / Q000302:isolation & purification; D001421:Bacteria, Anaerobic / Q000378:metabolism*; D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors; D003460:Crystallization / Q000379:methods; D008855:Microscopy, Electron, Scanning; D010758:Phosphorus / Q000302:isolation & purification*; D012722:Sewage / Q000032:analysis*; D013052:Spectrometry, X-Ray Emission; D014865:Waste Disposal, Fluid / Q000379:methods*; D018508:Water Purification / Q000379:methods*; D014961:X-Ray Diffraction
chemical_list: D012722:Sewage; D010758:Phosphorus; D000641:Ammonia