Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7475473 | Journal of Environmental Management | 2018 | 10 Pages |
Abstract
The present study evaluated the efficiency of a structured-bed reactor subjected to recirculation and intermittent aeration (SBRRIA) to promote nitrogen and carbon removal from domestic sewage. The intermittent aeration and the recycling rate of 3 keeps the desired mixing degree inside the SBRRIA. Four different operational conditions were tested by varying the hydraulic retention time (HRT) from 12 to 8â¯h and aerated and non-aerated periods (A/NA) from 2â¯h/1â¯h and 3â¯h/1â¯h. At the THD of 8â¯h and A/NA of 2â¯h/1â¯h there was a decrease in the nitrification process (77.5%) due to the increase of organic matter availability, affecting the total-N removal performance. However, by increasing the aerated period from 2â¯h to 3â¯h, the nitrification efficiency rose to 91.1%, reaching a total-N removal efficiency of 79%. The system reached a maximum total-N loading removed of 0.117â¯kgN.mâ3.dâ1 by applying an HRT of 8â¯h and an intermittent aeration cycle of 3â¯h, aerated and 1â¯h non-aerated. The simultaneous nitrification and denitrification (SND) process was related to a complex interplay among microorganisms affiliated mostly to Acidovorax sp., Comamonas sp., Dechloromonas sp., Hydrogenophaga sp., Mycobacterium sp., Rhodobacter sp., and Steroidobacter sp.
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Authors
Rafael B. Moura, Carla E.D. Santos, Dagoberto Y. Okada, Tiago H. Martins, Antônio Djalma N. Ferraz Júnior, Márcia H.R.Z. Damianovic, Eugenio Foresti,