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http://dx.doi.org/10.7844/kirr.2019.28.3.15

Mechanisms on Struvite Production for Nitrogen and Phosphorus Recovery  

Lee, Sang-hun (Dept. of Environmental Science, Keimyung University)
Publication Information
Resources Recycling / v.28, no.3, 2019 , pp. 15-20 More about this Journal
Abstract
The recovery of struvite using nitrogen and phosphorus in wastewaters is useful for prevention of eutrophication and use as fertilizer, but there are theoretical and technical issues to be resolved. Through the detailed literature review, this study discusses the possible reasonable prediction of struvite formation reaction by setting a feasible reaction equation with some theoretical considerations. In a technical aspect, the purity of struvite in solid precipitates can be promoted by excluding Ca in an effective way. As for the struvite reaction prediction issue, selection of proper equilibrium reaction as well as its reaction equilibrium coefficient is significant in the neutral and basic pH regions. The equilibrium reaction agrees well with the experimental batch test results. Considering the charge balance of the ions, the pH drop along struvite formation in a diluted solution can be predicted. Also, improvement of struvite purity through elimination of Ca can be expected by providing a highly concentrated ${NH_4}^+-N$ relative to ${HPO_4}^{2-}-P$ because ${NH_4}^+$ can enhance the thermodynamic driving force toward favorable struvite formation. Even though the phosphate reacts rapidly with Ca to form a solid precipitate, the thermodynamic driving force due to the high ${NH_4}^+$ activity can dissociate the phosphate-calcium precipitates and produce struvite.
Keywords
struvite; pH; phosphate; Ca; ${NH_4}^+$;
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Times Cited By KSCI : 1  (Citation Analysis)
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