Potassium ferrate (K₂FeO₄, PF), as a multifunctional green oxidant, has been used for oxidative degradation of pollutants and recovery of resources in sludge. However, its impact on the generation of hydrogen in anaerobic fermentation of waste activated sludge (WAS) is still unclear. The purpose of this work is to study the influence of PF on the dark fermentative hydrogen production. Experimental result suggested that as PF increased from 0 to 0.09 g/g of TSS (total suspended solids), the maximal hydrogen production increased from 1.47 to 8.35 mL/g VSS (volatile suspended solids). A further increase to 0.12 g/g of TSS resulted in a decrease in hydrogen yield. Mechanism studies revealed that that the addition of PF not only facilitated the disruption of sludge cell and extracellular polymeric substances (EPS) but also increased the proportion of biodegradable organics, providing more bioavailable organics for subsequent reactions involved in hydrogen accumulation. Although the activities of microorganisms relevant to dark fermentation were suppressed to a certain extent in the presence of PF, the induced suppression to hydrogen consumers was more severe. Microbial studies indicated that the relative abundances of hydrogen producers (such as Petrimonas and Proteiniborus) were augmented while hydrogen consumers (such as Methanosaeta and Methylocaldum) decreased in the presence of PF.

中文翻译：

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高铁酸钾（VI）增强废活性污泥中黑暗发酵氢积累的性能和机理

高铁酸钾（K ₂ FeO ₄PF）作为一种多功能绿色氧化剂，已用于污染物的氧化降解和污泥资源的回收。但是，其对废活性污泥（WAS）厌氧发酵中氢产生的影响尚不清楚。这项工作的目的是研究PF对深色发酵产氢的影响。实验结果表明，随着PF从0到0.09 g / g的TSS（总悬浮固体）增加，最大产氢量从1.47到8.35 mL / g VSS（挥发性悬浮固体）增加。TSS进一步提高到0.12 g / g导致氢气产率降低。机制研究表明，PF的加入不仅促进了污泥细胞和细胞外聚合物（EPS）的破坏，而且还增加了可生物降解有机物的比例，提供更多可生物利用的有机物，以进行涉及氢积累的后续反应。尽管在PF的存在下与暗发酵有关的微生物的活性在一定程度上受到抑制，但对氢消耗者的诱导抑制作用更为严重。微生物研究表明，氢气生产者的相对丰度（例如PF的存在增加了Petrimonas和Proteiniborus的含量，而氢的消耗者（如Methanosaeta和Methylocaldum）却减少了。