title: Recovery and removal of nutrients from swine wastewater by using a novel integrated reactor for struvite decomposition and recycling.
abstract: In the present study, struvite decomposition was performed by air stripping for ammonia release and a novel integrated reactor was designed for the simultaneous removal and recovery of total ammonia-nitrogen (TAN) and total orthophosphate (PT) from swine wastewater by internal struvite recycling. Decomposition of struvite by air stripping was found to be feasible. Without supplementation with additional magnesium and phosphate sources, the removal ratio of TAN from synthetic wastewater was maintained at >80% by recycling of the struvite decomposition product formed under optimal conditions, six times. Continuous operation of the integrated reactor indicated that approximately 91% TAN and 97% PT in the swine wastewater could be removed and recovered by the proposed recycling process with the supplementation of bittern. Economic evaluation of the proposed system showed that struvite precipitation cost can be saved by approximately 54% by adopting the proposed recycling process in comparison with no recycling method.
authors.affiliation: Hebei Key Laboratory of Applied Chemistry, School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, PR China.
authors.forename: Haiming
authors.initials: H
authors.lastname: Huang
authors.affiliation: College of Resource and Environmental Engineering, Guizhou Institute of Technology, Guiyang 550003, PR China.
authors.forename: Dean
authors.initials: D
authors.lastname: Xiao
authors.affiliation: Hebei Key Laboratory of Applied Chemistry, School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, PR China.
authors.forename: Jiahui
authors.initials: J
authors.lastname: Liu
authors.affiliation: Hebei Key Laboratory of Applied Chemistry, School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, PR China.
authors.forename: Li
authors.initials: L
authors.lastname: Hou
authors.affiliation: Hebei Key Laboratory of Applied Chemistry, School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, PR China.
authors.forename: Li
authors.initials: L
authors.lastname: Ding
mesh_terms: D000388:Air; D000641:Ammonia / Q000302:isolation & purification; D000818:Animals; D011232:Chemical Precipitation; D008274:Magnesium / Q000737:chemistry; D017616:Magnesium Compounds / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D009584:Nitrogen / Q000302:isolation & purification; D010710:Phosphates / Q000737:chemistry*; D059027:Recycling; D017550:Spectroscopy, Fourier Transform Infrared; D000069877:Struvite; D013552:Swine; D062065:Wastewater / Q000737:chemistry* / Q000191:economics; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification / Q000191:economics / Q000295:instrumentation* / Q000379:methods*
chemical_list: D000641:Ammonia; D008274:Magnesium; D017616:Magnesium Compounds; D009584:Nitrogen; D010710:Phosphates; D000069877:Struvite; D062065:Wastewater; D014874:Water Pollutants, Chemical