AI Article Synopsis
- The study examined how sulfur (S) behaves in constructed wetlands (CWs) and found that both abiotic and microbial factors influence S cycling.
- The presence of plants generally increased sulfate (SO-S) removal in conventional CWs but reduced it when zero-valent iron (ZVI) was present, indicating a complex relationship between plant growth and S levels.
- The research highlighted that certain genes and the plants' ability to release oxygen affected the transformation of solid-phase S into SO-S, suggesting that ZVI can shift from a sulfur sink to a source under certain conditions.
Article Abstract
The fate of sulfur (S) was controlled by a complex interaction of abiotic and microbial reactions in constructed wetlands (CWs). Although zero-valent iron (ZVI) was generally considered to promote nitrogen (N) and S cycle by providing electrons, but its binding effect on sulfate (SO-S) removal with the rhizosphere oscillating redox conditions had not been determined. This study found that the presence of plants increased SOS removal in Con-CW, while decreased it by 3.93 % in ZVI-CW accompanied by the decrease of S content in the rhizosphere substrates. The enrichment of S oxidation genes (soxA/Y and yedZ), organic S decomposition genes (aslA) and plants radial oxygen loss (ROL) accelerated the transformation of solid-phase S to SO-S, resulting in ZVI-CW turn from S sink to S source. Overall, the source-sink transformation provided a theoretical guidance for comprehending S cycling in CWs.
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| http://dx.doi.org/10.1016/j.biortech.2024.131010 | DOI Listing |
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