Responses of Anammox Granular Sludge to Long-Term Rare Earth Element Feeding: Lanthanum as a Case

Shuanglei Huang and Daishe Wu
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Shuanglei Huang: School of Resource, Environmental and Chemical Engineering, Nanchang University, Nanchang 330031, China
Daishe Wu: School of Resource, Environmental and Chemical Engineering, Nanchang University, Nanchang 330031, China

Sustainability, 2020, vol. 12, issue 19, 1-18

Abstract: A tremendous input of ammonium and rare earth elements (REEs) has entered the surroundings on account of the discharge and leak of leaching agents during rare earth in-suit leaching mining, which has threatened various organisms. Anammox has the potential to release nitrogen contamination, but the potential impacts of REEs on anammox bacteria remain unclear. In this study, La (III) was chosen as a case to explore the long-term impacts on anammox granular sludge. The 5 mg L −1 La (III) which was examined hardly affected the anammox granulates because of the defense of extracellular polymeric substances. The high La concentrations (10–50 mg L −1 ) caused intercellular accumulation and the significant inhibition of nitrogen removal performance and dehydrogenase activity, especially a decrease in the relative abundance of Ca. Kuenenia . Moreover, it also induced patently oxidative damage and affected cell membrane integrity. Notably, extracellular polymeric substances have a limited defense capability; neither La 3+ nor Ca 2+ /Mg 2+ efflux-related genes aggravated the intracellular accumulation of La.

Keywords: anammox; lanthanum ion; extracellular polymeric substances; nitrogen removal; granular sludge (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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