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Article Abstract
To promote efficiency nitrogen-rich wastewater treatment from a sequencing batch biofilm reactor (SBBR), three aerobic denitrifiers (Pseudomonas mendocinaIHB602, Methylobacterium gregansDC-1 and Pseudomonas stutzeriIHB618) with dual-capacities of strong auto-aggregation and high nitrogen removal efficiency were studied. The aggregation index analysis indicated that coaggregation of the three strains co-existed was better when compared with one or two strains grown alone. Optimal coaggregation strains were used to bioaugmente a test reactor (SBBR), which exhibited a shorter time for biofilm-formation than uninoculated control reactor (SBBR). With different influent ammonia-N loads (150, 200 and 300 mg·L), the average ammonia-N and nitrate-N removal efficiency were all higher than that in SBBR, as well as a lower nitrite-N accumulation. Microbial community structure analysis revealed coaggregation strains may successfully colonize in the bioreactor and be very tolerant of high nitrogen concentrations, and contribute to the high efficiency of inorganic nitrogen-removal and biofilm-formation.
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| http://dx.doi.org/10.1016/j.biortech.2021.125391 | DOI Listing |
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