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

被引：101

作者：

Si, Zhihao ^{[1
]}

Song, Xinshan ^{[1
]}

Wang, Yuhui ^{[1
]}

Cao, Xin ^{[1
]}

Wang, Yifei ^{[1
]}

Zhao, Yufeng ^{[1
]}

Ge, Xiaoyan ^{[1
]}

Sand, Wolfgang ^{[1
]}

机构：

[1] Donghua Univ, Coll Environm Sci & Engn, State Environm Protect Engn Ctr Pollut Treatment, Shanghai 201620, Peoples R China

来源：

JOURNAL OF HAZARDOUS MATERIALS | 2020年 / 393卷

基金：

中国国家自然科学基金;

关键词：

Sponge iron; Constructed wetlands; Inorganic electron donor; Denitrification; Wetland substrate; ZERO-VALENT IRON; WASTE-WATER TREATMENT; ENVIRONMENTAL APPLICATION; MICROBIAL COMMUNITY; NITROGEN REMOVAL; ORGANIC-CARBON; AUTOTROPHIC DENITRIFICATION; OXIDATIVE STRESS; ZEROVALENT IRON; SP-NOV;

D O I：

10.1016/j.jhazmat.2020.122407

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Sponge iron (s-Fe-0) 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-Fe-0 system), the removal performance and reduction characteristics of nitrate in constructed wetlands (CWs) with and without s-Fe-0 application were compared. Results indicated that s-Fe-0 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-Fe-0 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-Fe-0 system. The micro-environment created by s-Fe-0 was suitable for heterotrophic denitrifiers of Thauera, Tessaracoccus and Simplicispira. The determination of physiological indicators for plants showed that the application of s-Fe-0 causes abiotic stress to wetland plants (Canna indica L.). Nevertheless, s-Fe-0 can be used as a substrate for CWs, since it allows a high-efficiency removal of nitrate by mediating chemical denitrification and hydrogen-driven autotrophic denitrification.

引用

页数：12

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