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Effect of Seeding Materials and Mixing Strength on Struvite Precipitation
Struvite precipitation has increasing interest as a technology for removing and recovering phosphorus from wastewater streams. Many chemical factors have been studied, such as optimum pH values and component‐ion molar ratios, yet, understanding of physical aspects is lacking. Two physical parameters were tested: (1) seeding material addition and (2) mixing. Objectives were to evaluate three seeding materials and to optimize mixing conditions for struvite‐crystal precipitation, growth, and subsequent sedimentation. Results confirm that mixing strength and proper seeding materials increase crystal size and improve settleability. For unseeded solutions, optimum phosphorus removal was achieved at a mixing strength of G = 76 s −1. Struvite crystals that were added as the seeding material provided the best performance with respect to phosphorus removal and crystal‐size distribution. Overall, this study provided information to improve the practical application of struvite precipitation as a phosphorous‐treatment technology for wastewaters, while generating a marketable slow‐release fertilizer as a product.
Effect of Seeding Materials and Mixing Strength on Struvite Precipitation
Struvite precipitation has increasing interest as a technology for removing and recovering phosphorus from wastewater streams. Many chemical factors have been studied, such as optimum pH values and component‐ion molar ratios, yet, understanding of physical aspects is lacking. Two physical parameters were tested: (1) seeding material addition and (2) mixing. Objectives were to evaluate three seeding materials and to optimize mixing conditions for struvite‐crystal precipitation, growth, and subsequent sedimentation. Results confirm that mixing strength and proper seeding materials increase crystal size and improve settleability. For unseeded solutions, optimum phosphorus removal was achieved at a mixing strength of G = 76 s −1. Struvite crystals that were added as the seeding material provided the best performance with respect to phosphorus removal and crystal‐size distribution. Overall, this study provided information to improve the practical application of struvite precipitation as a phosphorous‐treatment technology for wastewaters, while generating a marketable slow‐release fertilizer as a product.
Effect of Seeding Materials and Mixing Strength on Struvite Precipitation
Wang, Jun (author) / Burken, Joel G. (author) / Zhang, Xiaoqi (Jackie) (author)
Water Environment Research ; 78 ; 125-132
2006-02-01
8 pages
Article (Journal)
Electronic Resource
English
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