污水磷回收新产物-蓝铁矿
Xiaodi Hao (Beijing University of Civil Engineering and Architecture)
Jian Zhou (Beijing University of Civil Engineering and Architecture)
Chongchen Wang (Beijing University of Civil Engineering and Architecture)
Mark Van Loosdrect (TU Delft - Applied Sciences, Beijing University of Civil Engineering and Architecture, TU Delft - OLD BT/Cell Systems Engineering)
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Abstract
The potential crisis of phosphorus resource is unprecedentedly pushing phosphorus recovery from wastewater and other sources. Although products of phosphorus recovery are variable, economic and high value-added products could promote owners to do so voluntarily. Among others, vivianite (Fe
3
(PO
4
)
2
•8H
2
O), which has been found to exist largely during biological sludge (biomass), is arousing attention to researchers. In fact, vivianite, a stable (K
sp
= 10
-36
) ferrophosphorus compound, widely exists in natural sediments. Besides such inherent factors as rich iron and phosphate, there are also some external factors determining formation of vivianite, like low oxidation-reduction potentials (ORP<-300 mV) and suitable pH conditions (6~9), etc. Fortunately, these inherent and external factors could be satisfied in wastewater and/or processes of wastewater treatment, and some wastewater treatment plants (WWTPs) in the Netherlands declared that they indeed found a large amount of vivianite presence in biological sludge. To promote both fundamental and applied researches on vivianite, the article reviews vivianite in: i) chemical properties, economic value and recovered potential; ii)controlling factors like pH, ORP, microorganisms, sulfide, etc.; iii) pathways of vivianite formation in biological sludge; iv) separation and purification of vivianite.