An aerated fluidized bed reactor (aerated-FBR) was used for recovery of orthophosphate (PO₄–P) from dairy wastewater (D-WW) and swine wastewater (S-WW) by struvite (MgNH₄PO₄·6H₂O) precipitation. Model wastewater solutions (S-model, D-model) free of organic material were also treated. The maximum PO₄–P recovery for treated livestock wastes was 94% for S-WW and 63% for D-WW. The PO₄–P recovery did not improve for S-model compared to S-WW, but increased to 81% for D-model relative to D-WW, suggesting that the high organic content of D-WW may hinder the recovery process. X-ray diffraction (XRD) analysis of recovered solids revealed that treated S-WW produced mostly struvite (95–98%) while D-WW yielded a mixture of struvite (28–33%), calcite (CaCO₃; 17–55%), and monohydrocalcite (CaCO₃·H₂O; 13–42%). The Fourier transform infrared (FTIR) spectra of the solids confirm the presence of vibrational bands associated with these minerals. Simultaneous thermal analysis (STA) indicated that all solids, except for D-WW, show thermogravimetric (TG) trends consistent with the struvite and calcium carbonate content. The D-WW solids had additional TG steps, possibly due to high organic and colloidal content, and slightly improved ammonium stability. The aerated-FBR treatment is an effective method to reduce PO₄–P from livestock wastewater through precipitation of pure struvite and struvite/calcium carbonate mixtures.

中文翻译：

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曝气流化床处理法从乳牛和猪废水中回收磷酸盐

曝气流化床反应器（充气FBR）用于通过鸟粪石（MgNH ₄ PO ₄ ·6H ₂ O）从乳品废水（D-WW）和猪废水（S-WW）中回收正磷酸盐（PO ₄ -P ）沉淀。还处理了不含有机物质的模型废水溶液（S模型，D模型）。处理后的牲畜废物的最大PO ₄ -P回收率对于S-WW为94％，对于D-WW为63％。PO ₄与S-WW相比，S模型的–P回收率没有改善，但相对于D-WW，D模型的P回收率提高了81％，这表明D-WW的高有机物含量可能会阻碍回收过程。对回收的固体进行的X射线衍射（XRD）分析表明，处理过的S-WW主要产生鸟粪石（95-98％），而D-WW则产生了鸟粪石（28-33％），方解石（CaCO ₃； 17-55 ％）和单氢方解石（CaCO ₃ ·H ₂O; 13–42％）。固体的傅立叶变换红外（FTIR）光谱证实了与这些矿物相关的振动带的存在。同时热分析（STA）表明，除D-WW外，所有固体均显示出与鸟粪石和碳酸钙含量一致的热重（TG）趋势。D-WW固体具有额外的TG步骤，这可能是由于有机和胶体含量高，以及铵稳定性略有提高。充气式FBR处理是通过沉淀纯鸟粪石和鸟粪石/碳酸钙混合物来减少牲畜废水中PO ₄ -P的有效方法。