Biological iron nitrogen cycle in ecological floating bed: Nitrogen removal improvement and nitrous oxide emission reduction
作者： Shanshan Sun , Xushun Gu , Manping Zhang , Li Tang , Shengbing He
DOI: 10.1016/J.ENVPOL.2020.115842
关键词:
摘要: Abstract Ecological floating beds (EFBs) have become a superior method for treating secondary effluent from wastewater treatment plant. However, insufficient electron donor limited its denitrification efficiency. Iron scraps lathe cutting waste consist of more than 95% iron could be used as donors to enhance denitrification. In this study, EFBs with and without supplementation (EFB-Fe EFB, respectively) were conducted explore the impacts addition on nitrogen removal, nitrous oxide (N2O) emissions microbial communities. Results showed total (TN) removal in EFB-Fe improved 79% while that EFB was 56%. N2O emission 0–6.20 mg m−2 d−1 (EFB-Fe) 1.74–15.2 mg m−2 (EFB). not only improve efficiency, but also reduce emissions. addition, high-throughput sequencing analysis revealed adding sum related genera, among which Novosphingobium accounted highest proportion (6.75% PFe1, 4.24% PFe2, 3.18% PFe3). Iron-oxidizing bacteria iron-respiring associated nitrate reducing mainly concentrated surface scraps. Principal co-ordinates (PCoA) indicated key factor affecting community composition. The mechanism enhanced realized by biological process. release dynamic detected bench-scale experiment transfer Fe0 transferred electrons directly NO3−-N, cycle occurred pollution.
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