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Research articles

ScienceAsia 47 (2021): 366-373 |doi: 10.2306/scienceasia1513-1874.2021.047


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


Baohua Lia,c, Yuanjun Daia, Wenjuan Songc, Xiangliang Panb,c,*

 
ABSTRACT:     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.

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a College of Mechanical Engineering, Shanghai Dianji University, Shanghai 201306 China
b College of Environment, Zhejiang University of Technology, Hangzhou 310014 China
c Xinjiang Institute of Ecology and Geography, Urumqi 830011 China

* Corresponding author, E-mail: panxl@zjut.edu.cn

Received 2 Sep 2020, Accepted 28 Mar 2021