Biochar boosts nitrate removal in constructed wetlands for secondary effluent treatment: Linking nitrate removal to the metabolic pathway of denitrification and biochar properties

被引：39

作者：

Guo, Fucheng ^{[1
,2
]}

Luo, Yang ^{[1
,2
]}

Nie, Wenbo ^{[1
,2
]}

Xiong, Zichun ^{[1
,2
]}

Yang, Xiangyu ^{[3
,4
]}

Yan, Jun ^{[1
,2
]}

Liu, Tao ^{[1
,2
]}

Chen, Mengli ^{[1
,2
]}

Chen, Yi ^{[1
,2
,5
]}

机构：

[1] Chongqing Univ, Key Lab Three Gorges Reservoir Reg Ecoenvironm, Minist Educ, Chongqing 400045, Peoples R China

[2] Chongqing Univ, Coll Environm & Ecol, Chongqing 400045, Peoples R China

[3] Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Environm Aquat Chem, Beijing 100085, Peoples R China

[4] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

[5] 174 Shazhengjie St, Chongqing, Peoples R China

来源：

BIORESOURCE TECHNOLOGY | 2023年 / 379卷

基金：

中国国家自然科学基金;

关键词：

Constructed wetland; Biochar; Nitrate removal; Secondary effluent treatment; Carbon and nitrate metabolism; NITROGEN REMOVAL;

D O I：

10.1016/j.biortech.2023.129000

中图分类号：

S2 [农业工程];

学科分类号：

0828 ;

摘要：

Constructed wetlands (CWs) amended with biochar have attracted much attention for nitrate removal treating secondary effluent. However, little is acknowledged about the linkage among the nitrate removal performance, microbial metabolic pathway of nitrate, and biochar properties. Herein, biochars pyrolyzed under 300 degrees C, 500 degrees C, and 700 degrees C (BC300, BC500, and BC700, respectively) were used in CWs to reveal the relationship. Results showed that CWs amended with BC300 (59.73%), BC500 (53.27%), and BC700 (49.07%) achieved higher nitrogen removal efficiency, compared with the control (39.51%). Metagenomic analysis showed that biochars could enrich the genes, which encoded key enzymes (adenosine triphosphate production, and electrons generation, transportation, and consumption) involved in carbon and nitrate metabolism. Further, biochar pyrolyzed under lower temperature, with higher oxygen content, molar O/C ratio, and the electron donating capacity, in CWs could obtain higher nitrate removal efficiency. Overall, this research offers new understandings for the promotion of denitrification in CWs amended with biochar.

引用

页数：11

共 48 条

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