School of Environment, Harbin Institute of Technology, Harbin 150090, PR China.
China Shanghai Architectural Design & Research Institute CO., LTD, Shanghai 200000, PR China.
Bioresour Technol. 2024 Aug;406:131014. doi: 10.1016/j.biortech.2024.131014. Epub 2024 Jun 18.
Polyferric sulfate (PFS) and ferric chloride (FC) were compared for their efficiencies in capturing organic carbon and phosphorus, and their effects on the anaerobic fermentation process of sludge from a pilot-scale two-stage reactor were studied. Both PFS and FC promoted organic carbon and phosphorus capture. Further study revealed that PFS-based sludge with a dosage of 18 mg Fe/L showed a better volatile fatty acids (VFAs) production performance (202.97 ± 2.38 mg chemical oxygen demand (COD)/g volatile solids (VS)) than that of FC-based sludge (169.25 ± 1.56 mg COD/g VS). Besides, the high dosage of PFS effectively promoted the activities of the α-glucosidase and proteases. The dissimilatory iron reduction process enhanced sludge flocs disintegration and the conversion of carbohydrates and proteins to VFAs. Non-hydroxyapatite phosphorus predominated in the total phosphorus of all samples. This study contributes to developing strategies for optimizing iron-based sludge management and high-value product recovery.
聚硫酸铁（PFS）和氯化铁（FC）在捕获有机碳和磷的效率方面进行了比较，并研究了它们对中试两级反应器中污泥厌氧发酵过程的影响。PFS 和 FC 都促进了有机碳和磷的捕获。进一步的研究表明，投加 18mg Fe/L 的 PFS 形成的污泥具有更好的挥发性脂肪酸（VFAs）生成性能（202.97±2.38mg 化学需氧量（COD）/g 挥发性固体（VS）），而投加 FC 形成的污泥则为 169.25±1.56mg COD/g VS。此外，高剂量的 PFS 还能有效促进α-葡萄糖苷酶和蛋白酶的活性。异化铁还原过程促进了污泥絮体的解体，以及碳水化合物和蛋白质向 VFAs 的转化。所有样品的总磷中均以非羟基磷灰石磷为主。本研究有助于制定优化基于铁的污泥管理和高价值产品回收的策略。
