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Struvite (MgNH4PO4•6H2O, or MAP) precipitation is a potential technology for removing and recovering phosphorus from municipal, industrial, or agricultural wastewater streams. Numerous researchers have investigated optimum pH values and component ratios in this process, however, studies on the seeding materials and mixing energy are lacking even though they are crucial in promoting crystal growth rates and sizes. The objectives of this study were to compare different seeding materials in facilitating struvite crystal growth and to optimize mixing strength for the process. In this study, three different seeding materials (quartz sand, granite and struvite crystals) were evaluated for potential to promote struvite crystal growth and precipitation. Results confirm that mixing strength and proper seeding materials can increase crystal size and improve settleability. Struvite crystals of 75∼150 μm diameter had the best performance among seeding materials studied with respect to P removal and size distribution of individual crystals.
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Document Type: Research Article

Publication date: 2003-01-01

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