Untangling the nitrate removal pathways for a constructed wetland- sponge iron coupled system and the impacts of sponge iron on a wetland ecosystem

Journal of Hazardous Materials
Zhihao SiWolfgang Sand

Abstract

Sponge iron (s-Fe0) is a potential alternative electron donor for nitrate reduction. To gain insight into the mechanism of denitrification in a constructed wetland- sponge iron coupled system (CW-Fe0 system), the removal performance and reduction characteristics of nitrate in constructed wetlands (CWs) with and without s-Fe0 application were compared. Results indicated that s-Fe0 intensified the removal of nitrate with a 6h-HRT. The nitrate removal efficiency was improved by 16-76 % with various influent NO3--N concentrations (10-30 mg L-1) and at a chemical oxygen demand(COD)/N ratio of 5. The rates of chemical denitrification were positively correlated with the dosage of s-Fe0 and negatively correlated with the influent COD concentration. 16S rDNA sequencing revealed that hydrogen-utilizing autotrophic denitrifier of Hydrogenophaga was highly enriched (accounting for 10 % of the total OTUs) only in CW-Fe0 system. The micro-environment created by s-Fe0 was suitable for heterotrophic denitrifiers of Thauera, Tessaracoccus and Simplicispira. The determination of physiological indicators for plants showed that the application of s-Fe0 causes abiotic stress to wetland plants (Canna indica L.). Nevertheless, s-Fe0 can be used as a ...Continue Reading

Citations

Jan 27, 2021·Bioresource Technology·Hongliang GuoDuu-Jong Lee
Jan 6, 2021·Environmental Science and Pollution Research International·Si QinJungchen Huang
Sep 4, 2021·Environmental Science and Pollution Research International·Ilaria BraschiAttilio Toscano
Oct 19, 2021·The Science of the Total Environment·Hefei ShiJinyou Shen

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