Struvite crystallization is a reliable method to recover nutrients from wastewater. Laboratory-scale experiments were conducted to investigate nutrient recovery from synthetic wastewater with high-strength orthophosphate and ammonia-nitrogen by the formation of struvite pellets. Without adjusting pH, struvite crystal growth environment was achieved in ammonia-nitrogen and orthophosphate concentration ranges of 100–1,000 and 221–2,214 mg/L, respectively. The mean size of the harvested struvite pellets was in the range of 3–4 mm. pH is an important factor indicating the process supersaturation. A range of pH 6.2–9.0 was tested in order to enhance nutrient removal efficiency. The results showed although higher N, P and Mg removals were achieved at higher pH values, over 95% N, P and Mg removals were still achieved at pH of 7.6. Recycling ratio of the clarifier supernatant to influent had no significant promotion of N or P removal.
Struvite pellet crystallization in a high-strength nitrogen and phosphorus stream
Yongmei Li, Mingyan Liu, Zhiwen Yuan, Jinte Zou; Struvite pellet crystallization in a high-strength nitrogen and phosphorus stream. Water Sci Technol 1 September 2013; 68 (6): 1300–1305. doi: https://doi.org/10.2166/wst.2013.372
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