State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, PR China.
State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, PR China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, PR China.
Bioresour Technol. 2022 Jul;355:127242. doi: 10.1016/j.biortech.2022.127242. Epub 2022 Apr 28.
Effects of fulvic acid (FA) and bovine serum albumin (BSA) on the transformation of ferric phosphate (FePO) during anaerobic fermentation of waste activated sludge were investigated. Both FA and BSA promoted phosphorus (P) release from FePO. A higher P release efficiency was achieved with FA addition compared with BSA at the same dose although BSA promoted iron (Fe) reduction more effectively. Both FA and BSA contributed to the enrichment of vivianite but hindered P re-precipitation with other ions, and FA affected more significantly. Microbial analysis revealed that FA contributed to the enrichment of iron-reducing bacteria (IRB) transporting electrons indirectly and increased the bioavailable Fe(III) via siderophores; BSA provided more electron donors, thereby enriched IRB transferring electrons directly to Fe(III). This study provides an in-depth understanding of Fe and P transformations in sludge bearing iron-phosphorus compounds and it is of practical value for P recovery as vivianite.
研究了腐殖酸（FA）和牛血清白蛋白（BSA）对厌氧发酵剩余污泥中磷酸铁（FePO）转化的影响。FA 和 BSA 均能促进 FePO 中的磷（P）释放。尽管 BSA 更有效地促进铁（Fe）还原，但与相同剂量的 BSA 相比，添加 FA 可实现更高的 P 释放效率。FA 和 BSA 均有助于富集蓝铁矿，但阻碍了其他离子与 P 的再沉淀，而且 FA 的影响更显著。微生物分析表明，FA 有助于富集间接传递电子的铁还原菌（IRB），并通过铁载体增加生物可利用的 Fe（III）；BSA 提供了更多的电子供体，从而富集了直接将电子传递给 Fe（III）的 IRB。本研究深入了解了含有铁磷化合物的污泥中 Fe 和 P 的转化，对于回收蓝铁矿形式的 P 具有实际价值。
