4.7 Article

The suitable biomass carbon source for improving nitrogen removal in surface flow constructed wetland system: Fresh vs. withered

Journal

JOURNAL OF ENVIRONMENTAL MANAGEMENT
Volume 308, Issue -, Pages -

Publisher

ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jenvman.2022.114624

Keywords

Plant biomass; Decomposition; Nitrogen removal; Sensory quality; Surface flow constructed wetland

Funding

  1. National Natural Science Foundation of China [52170167]
  2. National Key Research and Development Program of China [2017YFC0506003]

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This study found that compared to withered biomass, fresh biomass can release carbon source more effectively and improve nitrogen removal efficiency.
Plant biomass can be used as a carbon source to enhance the nitrogen removal effect. Related researches mainly focused on withered biomass, while little on fresh biomass. In this study, batch experiments revealed that the carbon release rate (60.5 mg TOC g(-1)) of fresh biomass was significantly higher than that of withered biomass (44.9 mg TOC g(-1)), while the nitrogen release rate showed the opposite trend. Compared with withered biomass, fresh biomass could release more sugar and less refractory humic acid, which means higher bioavailability. After adding fresh biomass, TN removal rate increased from 18.65% to 51.59%. The TN removal in the wetland adding withered biomass increased from 13.59% to 42.25%. The biomass addition had a slight impact on the effluent sensory quality in the first two days. After adding fresh biomass and withered biomass, the relative abundance of denitrifying bacteria like Flavobacterium and Pseudomonas in the system significantly increased. In general, fresh biomass was more suitable as a denitrification carbon source for surface flow constructed wetlands.

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