酸/碱预处理增强了废活性污泥厌氧发酵过程中磷铁矿的形成。
Acid/alkali pretreatment enhances the formation of vivianite during anaerobic fermentation of waste activated sludge.
机构信息
State Key Laboratory of Eco-hydraulics in Northwest Arid Region, Xi'an University of Technology, Xi'an, 710048, China.
State Key Laboratory of Eco-hydraulics in Northwest Arid Region, Xi'an University of Technology, Xi'an, 710048, China.
出版信息
J Environ Manage. 2022 Oct 1;319:115760. doi: 10.1016/j.jenvman.2022.115760. Epub 2022 Jul 18.
Phosphorus (P) recovery from waste activated sludge (WAS) of wastewater treatment plants is significant in the world suffering from P shortage. Recently, vivianite crystallization has been regarded as an essential method of recovering P from anaerobic fermentation (AF) of WAS. This study performed acid/alkali pretreatment (pH 3/pH 10) on AF of WAS to improve iron reduction and vivianite formation. The results showed that the maximum iron reduction rate (R) in the pH 3 and pH 10 groups was increased by 1.9 and 1.7 times compared with that in the Control-Fe group, and the iron reduction efficiency (E) was increased by 17.5% and 12.0% respectively. The Fe bound P (Fe-P) proportion in the sludge in the pH 3 and pH 10 groups increased by 50.0% and 33.7%, respectively. Furthermore, the relative abundance of the iron-reducing bacteria Clostridium_sensusensu in the pH 3 group was higher; and the Fe-P proportion in the sludge and the size of vivianite crystal after AF were larger. With these results, pH 3 pretreatment was preferred for promoting Fe release and vivianite formation during AF.
从遭受磷短缺的世界的角度来看，从废水处理厂的废活性污泥（WAS）中回收磷具有重要意义。最近，磷铁矿结晶已被认为是从 WAS 的厌氧发酵（AF）中回收磷的重要方法。本研究对 WAS 的 AF 进行了酸/碱预处理（pH 3/pH 10），以提高铁还原和磷铁矿的形成。结果表明，与对照-Fe 组相比，pH 3 和 pH 10 组的最大铁还原率（R）分别提高了 1.9 倍和 1.7 倍，铁还原效率（E）分别提高了 17.5%和 12.0%。pH 3 和 pH 10 组污泥中的铁结合磷（Fe-P）比例分别增加了 50.0%和 33.7%。此外，pH 3 组中还原敏感性梭菌的相对丰度更高；并且 AF 后污泥中的 Fe-P 比例和磷铁矿晶体的大小更大。有了这些结果，pH 3 预处理更有利于促进 AF 过程中铁的释放和磷铁矿的形成。
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