AI Article Synopsis
- * The structure of the immobilized filler allows for good connectivity and stable aggregation of AnAOB, which are evenly distributed and more abundant compared to traditional anammox granular sludge (AnGS).
- * Metagenome analysis suggests that the immobilized filler supports diverse AnAOB interactions, promoting better coordination with other microorganisms, while AnGS shows cracks and inefficiencies that hinder overall nitrogen removal.
Article Abstract
Here, the mechanism of encapsulated anammox bacteria (AnAOB) driving efficient nitrogen removal in the mainstream partial nitritation/anammox process is revealed. The results show that a high nitrogen removal rate (1.21±0.02 kgN·(m·d)) was achieved due to the abundant micropore structure inside the anammox immobilized filler, ensuring good connectivity, and a stable aggregation capacity, reducing dependence on extracellular polymeric substances. AnAOB were uniformly distributed throughout all regions of the immobilized filler, and their abundance was higher than that of the control anammox granular sludge (AnGS). Conversely, cracks appeared on the surface of the AnGS, and hollows formed inside. The metagenome analysis revealed that the immobilized filler supported the coexistence of multiple AnAOB, and the appropriate niche enhanced coordination between the AnAOB and dominant companion microorganisms. In contrast, AnGS exhibited stronger NH-N and NO-N loops, potentially reducing the total nitrogen removal efficiency. This study promotes the mainstream application of anammox.
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| http://dx.doi.org/10.1016/j.biortech.2024.130375 | DOI Listing |
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