期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 474, 期 -, 页码 93-102出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2016.04.013
关键词
Struvite; Synthetic wastewater; Computational model; Phosphorus recovery
资金
- Nuclear R&D, and Mid-career Researchers Program of the Ministry of Education, Science, and Technology through the National Research Foundation of Korea (NRF) [2013069183]
A computational model was developed and applied to investigate struvite precipitation under different pH levels and ionic concentrations. Ionic species, including ammonium (NH4-), hydrogen phosphate (HPO42-), magnesium (Mg2+), calcium (Ca2+), and struvite, were incorporated into the proposed model. The unknown kinetic coefficients of struvite were identified from the experimental data. In this study, the kinetics of struvite precipitation, which combined the ionic reactions (NH4+/NH3 and HPO42-/H2PO4) on the basis of pseudo-equilibrium conditions was parameterized. The experiments for model verification were conducted at a constant initial Mg/P ratio with changing ionic concentrations at pH levels of 8.7 and 9.7. The batch experiments showed high struvite precipitation (>90% for 300 mg-N L-1 and 100 mg-P L-1). The presence of Ca2+ (Ca2+/Mg2+ >0.5) in the reactors interfered with the formation and growth of struvite. The decrease in the pH level with the struvite precipitation verified the simulation data. The model also confirmed the optimal ionic conditions in order to maximize the struvite precipitation (300 mg-P L-1, and N/P molar ratio >7). The model responding to the ionic conditions provided good prediction of the decrease in the pH levels and the positive role of the nitrogen levels for struvite precipitation. High nitrogen concentrations provided high P removal due to pH buffering and crystal purity. (C) 2016 Elsevier Inc. All rights reserved.
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