Phosphorus recovery from industrial wastewater has attracted considerable interest. In this study, struvite crystallization method has been used for treatment of high phosphorus wastewater. The new combination agents of Mg5(CO3)4(OH)2·4H2O and NH4Cl were used as the precipitant. The effects of initial pH, n(Mg):n(P), n(N):n(P), and reaction time on the removal of total phosphorus (TP) in wastewater were investigated. The results showed that under the condition of initial pH = 4, Mg:N:P = 1.2:1.1:1, reaction time for 30 min, and static storage for 20 min, the residual amount of TP in wastewater was 2.98 mg /L, and the removal rate of TP reached 99.99%. The mass fraction of P2O5 in the generated sediment reached 25.22%, equivalent to high grade phosphate ore and slow-release fertilizer, so as to realize the recycling and utilization of phosphorus in ultra-high phosphorous wastewater. This work will have practical application potential in treatment of high phosphorus wastewater and environmental management.

中文翻译：

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鸟粪石结晶法从酸性超高磷废水中回收磷

从工业废水中回收磷引起了相当大的兴趣。本研究采用鸟粪石结晶法处理高磷废水。以Mg5(CO3)4(OH)2·4H2O和NH4Cl的新型复配剂为沉淀剂。研究了初始 pH、n(Mg):n(P)、n(N):n(P) 和反应时间对去除废水中总磷 (TP) 的影响。结果表明，在初始pH=4、Mg:N:P=1.2:1.1:1、反应时间30 min、静置20 min条件下，废水中TP残留量为2.98 mg /L ，TP去除率达到99.99%。生成的沉积物中P2O5的质量分数达到25.22%，相当于高品位磷矿和缓释肥料，从而实现超高磷废水中磷的回收利用。这项工作将在高磷废水处理和环境管理方面具有实际应用潜力。