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摘要
Compared with the conventional nitrification?denitrification treatment process commonly employed for nitrogen removal from swine wastewater,anaerobic ammonium oxidation(anammox)is an environmental?friendly and more energy?efficient biological process for nitrogen removal. Still,there is a lack of mature engineering applications for larger scale swine wastewater treatment. In this study,a pilot scale anammox?based technology was carried out to access its feasibility for swine wastewater treatment and explore the anammox microbiome structure. The integrated pilot equipment encompassed a denitrification unit,a partial nitrification unit and a partial nitrification?anammox unit(PN?A). During the stable operational phase,it reached a treatment capacity of over 2 m3.d?1 and showed good performance in nitrogen and carbon removals with a total nitrogen removal efficiency of 93.93%±0.44% and a COD removal efficiency of 84.43%±0.84%,respectively. High?throughput sequencing results revealed that Nitrosomonas genus was the primary aerobic ammonia?oxidizing bacteria in the system,which was significantly enriched in both the partial nitrification and PN?A units with relative abundances reaching up to 7.50%. The accumulation rate of nitrite in the partial nitrification unit was 74.28%,signifying stable partial nitrification performance within the system. The primary denitrifying bacteria in the denitrification unit were Thauera and Halomonas genera. Notably,Candidatus Kuenenia was the sole genus of anammox bacteria(AnAOB)detected in the system,found exclusively in the PN?A unit. In addition,the relative abundance of AnAOB on the carriers was significantly higher(ranging from 0.76 to 10.95 times)than that in the suspended sludge. In summary,our findings highlight the suitability of the integrated anammox process for swine wastewater treatment,delivering robust nitrogen removal efficiency. This study provides valuable engineering guidance for the treatment of livestock wastewater based on anammox technology. ? 2024 Science Press.
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