Abstract Nitrogen (N) and phosphorus (P) removal and recovery as struvite from various waste streams have drawn much attentions for environmentally friendly and economically competitive fertilizer production. In this study, integrated approach of using food wastewater (FW) and incinerated sewage sludge ash (ISSA) as the alternative N and P sources and optimum Mg dosage were investigated for the first time to achieve maximal nutrient recovery as struvite (MgNH4PO4∙6H2O). Response surface methodology (RSM) successfully established the optimum condition for the maximum recovery of PO43−-P (97.7%), NH4+-N (74.8%), and Mg2+ (95.5%) as precipitate at pH 9.63 and molar ratio of PO43−-P:NH4+-N:Mg2+ of 1:0.6:1.59. The recovered precipitate mostly consists of struvite (72.6%) and shows high P-bioavailability (98.8%) with very low heavy metals content indicating a high performance fertilizer. Moreover, economic analysis highlights that the struvite production pathway could gain $149.1/m3 of FW to move forwards for economical struvite production.

中文翻译：

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通过 RSM 的最佳镁剂量，最大限度地从食品废水和焚烧的污水污泥灰中回收铵和磷酸盐

摘要 从各种废物流中去除和回收作为鸟粪石的氮 (N) 和磷 (P) 已引起环境友好和具有经济竞争力的肥料生产的广泛关注。在本研究中，首次研究了使用食品废水 (FW) 和焚烧污泥灰 (ISSA) 作为替代 N 和 P 源以及最佳 Mg 剂量的综合方法，以实现鸟粪石 (MgNH4PO4∙6H2O) 最大养分回收. 响应面方法 (RSM) 成功建立了在 pH 9.63 和 PO43− 摩尔比下以沉淀形式最大回收 PO43--P (97.7%)、NH4+-N (74.8%) 和 Mg2+ (95.5%) 的最佳条件-P:NH4+-N:Mg2+ 为 1:0.6:1.59。回收的沉淀物主要由鸟粪石 (72.6%) 组成并显示出高磷生物利用度 (98. 8%) 的重金属含量非常低，表明是一种高性能肥料。此外，经济分析强调，鸟粪石生产途径可以获得 149.1 美元/立方米的 FW，以推进经济的鸟粪石生产。