Abstract
Efficiently enriching nitrous oxide (N2O) can provide a foundation for energy recovery during wastewater treatment. In this study, gas-liquid separation membranes were placed in a sequencing batch reactor fed with acidic nitrate-containing wastewater to determine the feasibility of enriching N2O by in situ separation of dissolved gases. Gas separation across the membrane (GSM) had no obvious effect on chemical oxygen demand and nitrate removal, but N2O production efficiency (NPE) increased from 11.0 % to 82.6 %. Denitrifying bacteria with low N2O yield such as Thauera, Diaphorobacter, and Flavobacterium were eliminated, and Propioniclava (46.79 %) and Candidatus_Competibacter (22.53 %) became dominant. Metagenomic sequencing showed that the abundance of the nosZ gene encoding N2O reductase decreased from 17.3 % to 6.1 %. In conclusion, GSM prevented the further reduction of N2O, eliminating denitrifying bacteria carrying the nosZ gene, which the enriched Propioniclava likely lacked. This demonstrates that GSM is an alternative strategy for N2O enrichment through nitrate denitrification.
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