Struvite precipitation under changing ionic conditions in synthetic wastewater: Experiment and modeling
- Title
- Struvite precipitation under changing ionic conditions in synthetic wastewater: Experiment and modeling
- Author
- 전병훈
- Keywords
- Struvite; Synthetic wastewater; Computational model; Phosphorus recovery
- Issue Date
- 2016-07
- Publisher
- ACADEMIC PRESS INC ELSEVIER SCIENCE
- Citation
- JOURNAL OF COLLOID AND INTERFACE SCIENCE, v. 474, Page. 93-102
- Abstract
- 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.
- URI
- https://www.sciencedirect.com/science/article/pii/S0021979716302272?via%3Dihubhttps://repository.hanyang.ac.kr/handle/20.500.11754/74388
- ISSN
- 0021-9797; 1095-7103
- DOI
- 10.1016/j.jcis.2016.04.013
- Appears in Collections:
- COLLEGE OF ENGINEERING[S](공과대학) > EARTH RESOURCES AND ENVIRONMENTAL ENGINEERING(자원환경공학과) > Articles
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