DOI: 10.1016/j.watres.2018.01.002
Scopus记录号: 2-s2.0-85042861707
论文题名: Elucidating the impacts of initial supersaturation and seed crystal loading on struvite precipitation kinetics, fines production, and crystal growth
作者: Agrawal S. ; Guest J.S. ; Cusick R.D.
刊名: Water Research
ISSN: 431354
出版年: 2018
卷: 132 起始页码: 252
结束页码: 259
语种: 英语
英文关键词: Nucleation
; Nutrient recovery
; Phosphorus
; Struvite precipitation
; Wastewater treatment
Scopus关键词: Crystal growth
; Granulation
; Kinetics
; Nucleation
; Nutrients
; Phosphorus
; Silicon
; Supersaturation
; Wastewater treatment
; Crystallization rates
; Design and operations
; First-order dependency
; Nutrient recovery
; Predictive capabilities
; Solids distribution
; Struvite precipitation
; Wastewater utilities
; Growth kinetics
英文摘要: To reduce intra-plant nutrient cycling, and recover phosphorus (P) fertilizers from nutrient-rich sidestreams, wastewater utilities increasingly elect to employ struvite precipitation processes without a clear understanding of the inherent tradeoffs associated with specific design and operating decisions. Specifically, the impact of reactor conditions on struvite crystallization rate, and distribution between formation of fines particles and secondary growth onto large diameter seed crystals represent critical knowledge gaps limiting the predictive capabilities of existing process models. In this work, the relative impacts of initial supersaturation (Si), and seed loading, on P removal kinetics, and struvite solids distribution were investigated. In experiments conducted at different levels of initial supersaturation (1.7–2.4) and seed loading (0–25 g L−1), struvite fines represented the majority of phosphate solids formed in 10 of 12 conditions. While total P removal was dependent on Si, and primarily attributed to formation of fines, the concentration of struvite seed granules had a significant impact on the rate of P removal. Struvite seed granules increased the rate of precipitation by reducing induction time of primary nucleation of struvite fines. Secondary crystal growth represented the majority of struvite solids formed at high seed loading and low Si, but presented the tradeoff of low total removal and low rate of removal. To convey the significance of these findings on process modeling, we show how a prominent kinetic model with a first-order dependency on solid struvite concentration over-predicts P removal rate when total mass is dominated by large diameter seeds (0.9 mm). This works reveals the critical role of struvite fines in P removal, and highlights the need to account for their production and kinetic importance in struvite process design and operation. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112966
Appears in Collections: 气候减缓与适应
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作者单位: Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign, 3217 Newmark Civil Engineering Laboratory, 205 North Mathews Avenue, Urbana, IL 61801, United States; Carollo Engineers, Inc., 8600 W Bryn Mawr Ave, Suite 900N, Chicago, Illinois 60631, United States
Recommended Citation:
Agrawal S.,Guest J.S.,Cusick R.D.. Elucidating the impacts of initial supersaturation and seed crystal loading on struvite precipitation kinetics, fines production, and crystal growth[J]. Water Research,2018-01-01,132