AI Article Synopsis
- - A novel biocarrier made from biochar and tourmaline polyurethane (BTP) enhanced the growth and nitrogen removal efficiency of Anammox bacteria, achieving an impressive 80% total inorganic nitrogen removal compared to 67% with an unmodified biocarrier.
- - The BTP system increased the abundance of genes related to amino acid synthesis and boosted protein secretion in extracellular polymer substances, which are crucial for biofilm formation and function.
- - Using BTP also improved key metabolic functions in AnAOB, such as heme concentration and specific anammox activity, while Candidatus Brocadia was identified as the dominant genus in the biofilm, which contributed to the enhanced nitrogen removal capabilities.
Article Abstract
A novel biochar/tourmaline polyurethane sponge modified biocarrier (BTP) could enhance Anammox bacteria (AnAOB) enrichment and nitrogen removal performance. With higher hydrophilicity and specific surface area, BTP significantly improved total inorganic nitrogen (TIN) removal efficiency to 80 ± 2 %, compared to unmodified biocarrier of 67 ± 3 % when influent TIN reached 633.9 ± 22.0 mg/L. BTP stimulated the upregulation of amino acid synthases genes abundance and improved protein secretion in extracellular polymer substances (EPS). Moreover, significant increases were found in heme concentration, specific anammox activity and hydrazine dehydrogenase of AnAOB with BTP compared to unmodified biocarrier. Extracellular electron transfer pathway of AnAOB was improved by BTP via upregulating cytochrome C and ferredoxin synthesis. Candidatus Brocadia was the main genus in Anammox biofilm, with relative abundance of 20.1 % and 27.6 % in the control and BTP, respectively, which explained the improvement of nitrogen removal performance.
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| http://dx.doi.org/10.1016/j.biortech.2024.131946 | DOI Listing |
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