Journal
ENVIRONMENTAL SCIENCE & TECHNOLOGY
Volume 54, Issue 18, Pages 11576-11583Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.0c02882
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Funding
- National Key R&D Program of China [2018YFC0406303]
- National Natural Science Foundation of China [51908529, 21590812, 51538011, 51821006]
- International Partnership Program of Chinese Academy of Sciences [GJHZ1845]
- China Postdoctoral Science Foundation [2018M642543]
- Anhui Provincial Natural Science Foundation [1908085QB88]
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Phosphorus (P) recovery from wastewater can be completed by iron-involved autotrophic denitrification via forming Fe(III)-P precipitates and/or adsorbing P onto Fe(III) oxyhydroxides. However, so far, most studies focused on the final P-containing products, while the P-capturing pathways in such a process remain unclear. In this work, autotrophic iron-dependent denitrification (AIDD) was used as a typical anoxic iron-involved P-capturing biosystem to investigate the main P recovery pathways. The AIDD biosystem showed a relatively stable capability of capturing P coupled with nitrate reduction. Direct formation of amorphous Fe(II)-P precipitates after the phosphate was fed, followed by microbially driven oxidation into Fe(III)-P minerals, was found to be the primary pathway for the P capture. In addition, adsorption of phosphate onto the formed iron oxyhydroxides also contributed to the P recovery. This work provides better understanding about recovering P in AIDD and iron-involved denitrification and highlights the important roles of iron oxidizers in the iron-related biological wastewater treatment processes.
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