title: Application of struvite precipitation in treating ammonium nitrogen from semiconductor wastewater.
abstract: Struvite precipitation was applied to the removal of NH(4)-N in semiconductor wastewater. Batch experiments were conducted to examine the effects of final pH, magnesium and orthophosphate dosages and the initial influent concentrations of NH(4)-N and F on the removals of NH(4)-N and PO(4)-P by forming struvite deposits. pH was an important parameter in the simultaneous removals of ammonium nitrogen and orthophosphate. In struvite precipitation, the amount of orthophosphate in the solution affected NH(4)-N removal much more than that of magnesium ions in some cases. It was revealed that the low and high initial concentrations of NH(4)-N and F inhibited NH(4)-N and PO(4)-P removal efficiencies in struvite precipitation, respectively. We also evaluated field-scale treatment plant incorporated by struvite precipitation process. On semiconductor wastewater with an NH(4)-N concentration of 155 mg/L, the results obtained showed that the incorporation of the struvite precipitation process brought about a high NH(4)-N removal efficiency of over 89% on average.
authors.affiliation: Department of Environmental Engineering, Chungbuk National University, Cheongju, South Korea. nanumenv@hanmail.net
authors.forename: Hong-Duck
authors.initials: HD
authors.lastname: Ryu
authors.forename: Daekeun
authors.initials: D
authors.lastname: Kim
authors.forename: Sang-Ill
authors.initials: SI
authors.lastname: Lee
mesh_terms: D011232:Chemical Precipitation; D006863:Hydrogen-Ion Concentration; D007220:Industrial Waste; D017616:Magnesium Compounds / Q000737:chemistry*; D009584:Nitrogen / Q000737:chemistry*; D010710:Phosphates / Q000737:chemistry*; D000644:Quaternary Ammonium Compounds / Q000737:chemistry*; D012666:Semiconductors; D000069877:Struvite
chemical_list: D007220:Industrial Waste; D017616:Magnesium Compounds; D010710:Phosphates; D000644:Quaternary Ammonium Compounds; D000069877:Struvite; D009584:Nitrogen