通过优化厌氧发酵过程中的铁源和 pH 值，从废活性污泥中回收磷作为磷铁矿。
Phosphorus recovery as vivianite from waste activated sludge via optimizing iron source and pH value during anaerobic fermentation.
机构信息
Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, College of Environment, Hohai University, Nanjing 210098, China; College of Environment, Hohai University, Nanjing 210098, China.
Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, College of Environment, Hohai University, Nanjing 210098, China; College of Environment, Hohai University, Nanjing 210098, China.
出版信息
Bioresour Technol. 2019 Dec;293:122088. doi: 10.1016/j.biortech.2019.122088. Epub 2019 Aug 30.
This study presented an innovative method for phosphorus (P) recovery as vivianite from waste activated sludge (WAS) via optimizing iron dosing and pH value during anaerobic fermentation (AF). The optimal conditions for vivianite formation were in the pH range of 6.0-9.0 with initial PO >5 mg/L and Fe/P molar ratio of 1.5. Notably, FeCl showed advantages over ZVI for the simultaneous release of Fe and PO during WAS fermentation, especially in acidic conditions. The FeCl dosing at pH 3.0 could contribute to 78.81% Fe release and 85.69% of total PO release from WAS. They were ultimately recovered in the form of high-purity vivianite (93.67%). Clostridiaceae (40.25%) was the predominant bacteria in FeCl-pH3 reactors, which played key roles in inducing dissimilatory iron reduction for Fe formation. Therefore, P recovery as vivianite from WAS fermentation might be a promising and highly valuable approach to relieve the P crisis.
本研究提出了一种从废活性污泥（WAS）中通过优化厌氧发酵（AF）过程中的铁投加量和 pH 值以蓝铁矿形式回收磷（P）的创新方法。蓝铁矿形成的最佳条件是在 pH 值为 6.0-9.0 之间，初始 PO >5mg/L 和 Fe/P 摩尔比为 1.5。值得注意的是，在 WAS 发酵过程中，FeCl 相对于 ZVI 具有同时释放 Fe 和 PO 的优势，尤其是在酸性条件下。在 pH 为 3.0 时投加 FeCl 可使 78.81%的 Fe 释放，85.69%的总 PO 从 WAS 中释放。最终以高纯度蓝铁矿（93.67%）的形式回收。在 FeCl-pH3 反应器中，梭菌科（40.25%）是主要细菌，在诱导铁异化还原形成 Fe 方面发挥了关键作用。因此，从 WAS 发酵中以蓝铁矿形式回收 P 可能是一种缓解 P 危机的有前途且极具价值的方法。
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