AI Article Synopsis
- An immobilized biofilm reactor (IBR) was developed to efficiently remove nitrate using various electron donors, utilizing a new adsorbent material called FeO@Cu/PVA.
- The optimal conditions for nitrate removal were found to be a pH of 7.0 and a hydraulic retention time of 10 hours, with the mixotrophic environment showing better performance and stability in pH variations.
- Microbial analysis revealed that the IBR's bacterial structure was primarily dominated by Proteobacteria, with Pseudomonas and Rhizobium playing key roles in effectively removing nitrate.
Article Abstract
An immobilized biofilm reactor (IBR) was established to treat nitrate using different electron donors. A novel material, FeO@Cu/PVA, was synthesized as an adsorbent and bacterial immobilized carrier in the reactor. The optimum condition of nitrate removal were pH 7.0, hydraulic retention time (HRT) of 10 h under autotrophic and mixotrophic conditions. Strain H-117 in the mixotrophic reactor had better adaptability to changes in the initial pH. The metabolism in the mixotrophic reactor was more vigorous than that in autotrophic reactor. The microbial communities and structures were evaluated to determine the nitrate removal mechanisms in this system. Microbial analyses demonstrated that different electron donor could influence the bacterial abundance and species in the IBR system. Proteobacteria was the most dominant phylum in all IBRs and accounted for more than 50% of the total phyla. Pseudomonas and Rhizobium were the dominant contributor to the effective removal of nitrate in the IBRs.
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| http://dx.doi.org/10.1016/j.biortech.2019.121407 | DOI Listing |
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