AI Article Synopsis
- A new strain of bacteria, Raoultella ornithinolytica YX-4, was found in pig farm wastewater and can effectively remove ammonium, nitrate, nitrite, and phosphorus.
- The strain exhibits pathways for heterotrophic nitrification, aerobic denitrification, and phosphorus accumulation, achieving removal rates of 99%, 97%, and 93% for ammonia and nitrate/nitrite, respectively, under optimal conditions.
- This study is the first to report on the denitrification capabilities of R. ornithinolytica and emphasizes the expression of key enzyme genes related to wastewater treatment efficiency.
Article Abstract
A novel strain having ability to simultaneously remove ammonium nitrogen, nitrate nitrogen, nitrite nitrogen and phosphorus was isolated from swine farm wastewater and was identified as Raoultella ornithinolytica YX-4 (NCBI accession number: OR646540). Nitrogen and phosphorus balance analysis combined with amplification of key enzyme genes of metabolic pathways revealed that the strain possess heterotrophic nitrification, aerobic denitrification, phosphorus accumulation and assimilation pathways. Significant removal of ammonium nitrogen, nitrate nitrogen and nitrite nitrogen were achieved (99%, 97% and 93% respectively) with optimal culture conditions. The transcript level of key enzyme genes was detected at different incubation period, and significant up-regulation of glnA, narI, narH, nirB, nirD, ppk1, and ppk2 was noted. This is the first report of the denitrification of phosphorus accumulating organisms R. ornithinolytica and reveals tangible results of key enzyme gene expression during real wastewater treatment.
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| http://dx.doi.org/10.1016/j.biortech.2023.129922 | DOI Listing |
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