Montmorillonite supported nanoscale zero-valent iron immobilized in sodium alginate (SA/Mt-NZVI) enhanced the nitrogen removal in vertical flow constructed wetlands (VFCWs)

Yufeng Zhao; Xin Cao; Xinshan Song; Zhimiao Zhao; Yuhui Wang; Zhihao Si; Fanda Lin; Yan Chen; Yinjiang Zhang

doi:10.1016/j.biortech.2018.07.072

Montmorillonite supported nanoscale zero-valent iron immobilized in sodium alginate (SA/Mt-NZVI) enhanced the nitrogen removal in vertical flow constructed wetlands (VFCWs)

Bioresour Technol. 2018 Nov:267:608-617. doi: 10.1016/j.biortech.2018.07.072. Epub 2018 Jul 19.

Authors

Yufeng Zhao¹, Xin Cao¹, Xinshan Song², Zhimiao Zhao³, Yuhui Wang¹, Zhihao Si¹, Fanda Lin¹, Yan Chen¹, Yinjiang Zhang³

Affiliations

¹ State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China.
² State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China. Electronic address: newmountain@dhu.edu.cn.
³ Engineering Research Center for Water Environment Ecology in Shanghai, College of Marine Ecology and Environment, Shanghai Ocean University, Shanghai 201306, China.

PMID: 30056371
DOI: 10.1016/j.biortech.2018.07.072

Abstract

Lacking of electron donor generally causes the low denitrification performance of constructed wetlands (CWs). Montmorillonite supported nanoscale zero-valent iron immobilized in sodium alginate (SA/Mt-NZVI) as novel electron donor-acceptor compounds were added in the denitrification zone of vertical flow constructed wetlands (VFCWs) to enhance the nitrogen removal. The key factors of the SA/Mt-NZVI dosage, the hydraulic retention time (HRT) of VFCWs, and the C/N ratios of influent were explored. SA/Mt-NZVI significantly improved the nitrogen (NO₃^--N) removal efficiency in VFCWs. When the optimal dosage of SA/Mt-NZVI was set as 2 g and the C/N was set as 6, the highest NO₃^--N removal efficiency was improved by 32.5 ± 1.0%. The microbial community analysis of by 16S rRNA had revealed that Proteobacteria and Bacteroidetes at phylum level and Betaproteobacteria, Gammaproteobacteria, and Alphaproteobacteria at class level played an important role in nitrogen removal.

Keywords: C/N; Denitrification; Microbial diversity; SA/Mt-NZVI; VFCW.

MeSH terms

Alginates
Bentonite / chemistry*
Denitrification*
Glucuronic Acid
Hexuronic Acids
Iron
Nitrogen
RNA, Ribosomal, 16S
Wetlands*

Substances

Alginates
Hexuronic Acids
RNA, Ribosomal, 16S
Bentonite
Glucuronic Acid
Iron
Nitrogen