An integrated approach to vivianite recovery from waste activated sludge. (March 2023)

• Record Type: Journal Article
• Authors: Hu, Zhetai; Li, Weiwei; Duan, Haoran; Huang, Xin; Meng, Jia; Yang, Liangzhen; Zheng, Min
• Is Part Of: Bioresource technology. Volume 371(2023)
• Publication Date: 2023-03
• Subjects: Phosphorus recovery -- Waste activated sludge -- Vivianite -- Sludge acid-elutriation -- Sludge dewaterability improvement; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2023.128608
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: The sludge anaerobic fermentation process efficiently reduces Fe 3+ to Fe 2+ . The acid-elutriation solubilizes Fe and P from the solid phase to the liquid phase. The acid-elutriation significantly enhances the liquid–solid separation. High-quality vivianite is harvested via neutralizing sludge eluate. Abstract: The waste activated sludge (WAS) of wastewater treatment system is often rich in phosphorus (P), which is a basic element of human life and could use up in the near future. This study proposed an integrated approach to efficiently recover P as vivianite from WAS and simultaneously enhance the sludge dewaterability. The raw WAS was first acidified using FeCl3, which was then fed to anaerobic fermenter for Fe 3+ reduction. After fermentation, a technology named acid-elutriation was introduced to convert Fe and P from solid phase to liquid phase and concomitantly enhance the liquor-solid separation. Finally, vivianite was obtained via sludge eluate neutralization. The enhanced sludge dewaterability not only increases the recovery efficiency of Fe and P but also decreases the cost of sludge disposal.