In , we can find a review of "potentials and challenges of phosphorus recovery as vivianite from wastewater". "Due to the shortage of phosphorus resources and the limitations of existing phosphorus recovery methods, phosphorus recovery in the form of vivianite has attracted considerable attention with its natural ubiquity, easy accessibility and foreseeable economic value". Wu and coworkers are proposing a review which summarizes the chemistry of vivianite. Then, "the potential of phosphorus recovery as vivianite from wastewater has also been comprehensively examined from the prospects of economic value and engineering feasibility. … However, the insufficient understanding on vivianite recovery in wastewater/sludge decelerate the development and exploration of such advanced approach" . , note that the development of "feasible techniques to recover phosphorous (P) from wastewater and sewage sludge is urgent work to meet the huge demand for P resources and wastewater/sludge management. Recently, recovering P as value-added vivianite has aroused great interest due to the convenient process operation, high recovery efficiency, and wide applications of vivianite". Advanced technologies are "including ion exchange, electrodialysis, capacitive deionization, membrane bioreactor, anaerobic fermentation, chemical precipitation, electrochemical crystallization, biomineralization, and anaerobic digestion" as summarized by Zhang and coworkers.