Biochemically induced phosphate precipitation in enhanced biological phosphorus removal system: Mechanism,
Shipeng Li1, Xiaoli Zhou2, Xuandi Cao1
1School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang, China.
None:
Enhanced Biological Phosphorus Removal (EBPR) is a core biological wastewater treatment process, yet it faces challenges related to operational stability and treatment limits. Biochemically Induced Phosphate Precipitation (BIPP), a common phenomenon in EBPR systems, leverages microbial metabolism to form localized microenvironments that promote in-situ phosphate crystallization-mainly as struvite or calcium phosphate. This phenomenon not only provides a novel pathway for achieving deep phosphorus removal but also enables simultaneous resource recovery. However, the role of BIPP in EBPR systems is mechanistically complex and exhibits a pronounced "double-edged sword" effect, which calls for systematic examination and critical evaluation. This review systematically examines the mechanisms by which BIPP functions in EBPR systems, emphasizing synergies among polyphosphate-accumulating organisms, microbial metabolites, and metal ions. Key operational factors influencing BIPP are critically analyzed. Furthermore, the benefits of BIPP on EBPR performance are highlighted, including improved phosphorus removal, enhanced sludge settleability, and phosphorus recovery potential. By synthesizing current knowledge, this review provides a theoretical framework to deepen the understanding of BIPP mechanisms and promote innovation in phosphorus resource recovery technologies in wastewater treatment.
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