Effects of alfalfa root exudates on the microbial remediation of nitrate-heavy metal complex pollution in groundwater

被引：4

作者：

Li, Baohua ^{[1
,3
]}

Dai, Yuanjun ^{[1
]}

Song, Wenjuan ^{[3
]}

Pan, Xiangliang ^{[2
,3
]}

机构：

[1] Shanghai Dianji Univ, Coll Mech Engn, Shanghai 201306, Peoples R China

[2] Zhejiang Univ Technol, Coll Environm, Hangzhou 310014, Peoples R China

[3] Xinjiang Inst Ecol & Geog, Urumqi 830011, Peoples R China

来源：

SCIENCEASIA | 2021年 / 47卷 / 03期

关键词：

root exudates; heavy metals; groundwater; ferrous oxidizing denitrifying bacteria; ORGANIC-MATTER; PTERIS-VITTATA; ADSORPTION; SORPTION; CADMIUM; EXCITATION; OXIDATION; GOETHITE; FE(II); GAMMA;

D O I：

10.2306/scienceasia1513-1874.2021.047

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

The effects of root exudate addition on Fe(II) oxidation, nitrate degradation, and heavy metal removal by Clostridium sp. strain PXL2 were studied. The root exudate addition could increase the average oxidation rate of Fe(II) from 0.52 to 0.68 mM Fe(II)/d. The removal rate of nitrate, arsenic, and mercury could be increased from 54% to 95%, 84% to 99%, and 60% to 86%, respectively. The complexation of Fe(III) with the root exudates was analyzed by quenching titration. The results showed that there was a complexation of root exudates with Fe(III). This complexation resulted in increased precipitation of iron oxides and further promoted the removal of heavy metals.

引用

页码：366 / 373

页数：8

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