Journal
CHEMOSPHERE
Volume 286, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2021.131781
Keywords
Autotrophic denitrification; Heterotrophic denitrification; Mixotrophic denitrification; Composite filler; Alkalinity
Categories
Funding
- Shenzhen Science and Technology Innovation Commission [KQJSCX20180328165658476, JCYJ20180306172051662, JCYJ20200109113006046, KCXFZ202002011006362]
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Optimal denitrification was achieved at a ratio of 2:1 by adjusting the elemental sulfur content in the composite fillers, leading to an increase in microbial abundance. The biofilm composition transitioned from a single dominant species to multiple species, with an increase in genes related to sulfur metabolism.
Removal of nitrogen from wastewater with low carbon/nitrogen ratio was treated by using a denitrification packed bed reactor. Composite fillers with both autotrophic and heterotrophic denitrification capacity were prepared by mixing melted polycaprolactone and elemental sulfur at various alkalinity ratios (heterotrophic to autotrophic ratios of 1:2, 1:1, 3:2, and 2:1). Optimum denitrification was achieved at a ratio of 2:1. The diversity of the microbial community in the biofilm on the surface of the composite fillers showed that the increase of the elemental sulfur in the composite fillers has led to the increase of the microbial abundance. Furthermore, biofilm composition developed from a single dominant species to multiple species, and genes related to sulfur metabolism increased while those related to denitrification decreased slightly.
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