Henan Collaborative Innovation Center for Environmental Pollution Control and Ecological Restoration, School of Materials and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou 450001, China
Abstract:In order to study how to rapid recover the activity of Anammox process which had been interrupted under emergency situation for a long-term, the nitrogen removal performance and microbial variations of three Anammox reactors were comparatively analyzed. The reactors were named as R1 (biofilter), R2 (membrane bioreactor, MBR), and R3 (MBR), where R1 and R2 had the same influent concentration, R2 and R3 had the same reactor type but different influent concentration. The results showed that the Anammox activity in R1, R2, and R3 was recovered after 39, 93, and 76days, with the total nitrogen removal efficiency returned to 87.0%, 83.4%, 87.6%, and the total nitrogen removal rate restored to 0.359, 0.114, 0.244kg/(m3·d), respectively. Compared R1 with R2, the Anammox biofilter could withstand higher hydraulic load, showed higher stability after long-term interruption, and was easier to recover. Compared R2 with R3, the higher influent concentration supplied sufficient substrate for Anammox bacteria, and formed concentration pressure for promoting the transformation of ammonia and nitrite inside the sludge, thus led to better recovery performance. The results of high-throughput sequencing showed that the relative abundance of Candidatus Kuenenia before (after) recovery of the three reactors were 17.3% (32.0%), 1.6% (2.6%), 1.8% (6.0%), and the abundance in R1after recovery was the highest.
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