Effects of O2 on accumulation of nitrous and elemental sulfur and microbial community structure in double short-cut sulfur autotrophic denitrification system
[Display omitted] •The accumulation efficiency of NO2−-N and S0 reached 89.40% and 93.41%, respectively.•O2 changes the ORP value, leading to a decrease in the accumulation of S0 and NO2−.•O2 entry accelerates the oxidation of S2−, but limits the reduction of NO3−-N.•DO promoted the synergistic effe...
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Veröffentlicht in: | Bioresource technology 2024-10, Vol.409, p.131243, Article 131243 |
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Sprache: | eng |
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•The accumulation efficiency of NO2−-N and S0 reached 89.40% and 93.41%, respectively.•O2 changes the ORP value, leading to a decrease in the accumulation of S0 and NO2−.•O2 entry accelerates the oxidation of S2−, but limits the reduction of NO3−-N.•DO promoted the synergistic effect of Thiobacillus and Azoarcus without Nitrospia.
Understanding the effect of O2 on the accumulation characteristics of NO2−-N and S0 in the sulfur autotrophic denitrification (DSSADN) system is crucial for enhancing the denitrification efficiency of partial nitrification-anammox using DSSADN. The results revealed that in an environment without O2 entry, the NO2−-N accumulation efficiency (NiAE) and S0 accumulation efficiency (S0AE) of the DSSADN system reached 89.40 % and 93.41 %, respectively. Once system entered O2, ORP value kept increasing. When ORP increased to −59.9 mV (DO = 0.1 mg/L), soxB and nirK gene expression rose and as well NiAE and S0AE continuously decreased to 48.13 % and 29.35 %. When ORP was above 30.9 mV (DO >0.2 mg/L) but below 81.0 mV (DO |
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ISSN: | 0960-8524 1873-2976 1873-2976 |
DOI: | 10.1016/j.biortech.2024.131243 |