Differences in bacterial N, P, and COD removal in pilot-scale constructed wetlands with varying flow types

Luping Zeng, Ran Tao, Nora Fung yee Tam, Wenda Huang, Longzhen Zhang, Ying Man, Xiaomin Xu, Yunv Dai, Yang Yang

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)

Abstract

The mechanisms of bacterial nitrogen (N), phosphorus (P), and chemical oxygen demand (COD) removal in pilot-scale constructed wetlands (CWs) were investigated in the present work. Three types of CWs were assessed: vertical flow (VF), horizontal flow (HF), and surface flow (SF), each with three planting conditions, with either Thalia, Canna or without plants. The results show that construction types affected microbes more than planting conditions. VF CWs promoted the aerobic processing of total N, total P, COD, and NH3-N, increasing the respective removal efficiencies by 4–19%, 13–32%, 19–29%, and 75–80%, respectively, compared with SF CWs. The relative abundance of nitrifying, denitrifying, methanotrophic and dephosphorized bacteria, and functional genes such as nxrA, nirK, nosZ, mmoX, and phoD were higher in VF CWs. Positive and simple gene networks in VF CWs can effectively reduce the redundancy in functional genes, enhance bacterial function and gene interactions, thus promoting nutrient removal.

Original languageEnglish
Article number124061
JournalBioresource Technology
Volume318
DOIs
Publication statusPublished - Dec 2020

Keywords

  • Constructed wetland
  • Functional bacteria and genes
  • Methane metabolism
  • Network complexity
  • Nitrogen and phosphorus removal

Fingerprint

Dive into the research topics of 'Differences in bacterial N, P, and COD removal in pilot-scale constructed wetlands with varying flow types'. Together they form a unique fingerprint.

Cite this