Bioremediation potential and primary mechanism of Sporosarcina pasteurii for cadmium (Cd) and lead (Pb) in contaminated tailings

IF 1.3 4区环境科学与生态学 Q3 ECOLOGY

Chemistry and Ecology Pub Date : 2023-04-26 DOI:10.1080/02757540.2023.2202659

Fengli Xu, Dongxing Wang

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引用次数: 0

Abstract

ABSTRACT Efficient bioremediation technology has drawn extensive attention from scholars due to the serious damage caused by heavy metals (HMs) to the environment. This study explored the remediation potential and mechanisms of the S. pasteurii strain in alleviating toxicity of Cd and Pb in tailings. The results showed that the decrease in DTPA-Cd and -Pb was associated with the transfer of exchangeable HMs to carbonate-bound HMs in bacteria-treated tailings. Biomineralization, extracellular adsorption, and intracellular accumulation were observed to result in removal rates above 95% for HMs in tailings solution. Mineralisation products driven-urease were identified as carbonate minerals, including otavite CdCO3, cerussite PbCO3 and hydrocerussite Pb3(CO3)2(OH)2. However, the increased Km in the urease kinetics study indicated that HMs reduced urease activity and biomineralization by minimum inhibitory concentrations (Cd 0.5 mM and Pb 40 mM). The functional groups (-OH, -NH2, -COOH and -PO4 3-) on the bacterial surface were involved in immobilising HMs, while the biosorption capacity (qm) was inhibited by metal ions (Pb2+ > Cd2+) according to Langmuir sorption isotherm. In conclusion, the biomineralization-adsorption of S. pasteurii was the mainstay for stabilising Cd and Pb in tailings, and the contribution of biomineralization was found to be much higher than that of biosorption.

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巴氏孢杆菌对污染尾矿中镉、铅的生物修复潜力及主要机制

由于重金属对环境的严重危害，高效生物修复技术引起了学者们的广泛关注。本研究探讨了巴氏杆菌对尾矿中镉和铅的修复潜力及其机制。结果表明，细菌处理后的尾矿中DTPA-Cd和-Pb含量的降低与可交换性溶质向碳酸盐结合溶质的转移有关。生物矿化、细胞外吸附和细胞内积累对尾矿溶液中HMs的去除率达到95%以上。矿化产物经脲酶驱动鉴定为碳酸盐矿物，包括滑滑石CdCO3、铜矿PbCO3和氢铜矿Pb3(CO3)2(OH)2。然而，在脲酶动力学研究中，Km的增加表明，HMs通过最低的抑制浓度(Cd 0.5 mM和Pb 40 mM)降低了脲酶活性和生物矿化。Langmuir吸附等温线显示，细菌表面的官能团(- oh， - nh2， - cooh和- po4 3-)参与了固定化HMs，而金属离子(Pb2+ > Cd2+)抑制了HMs的生物吸附能力(qm)。综上所述，巴氏杆菌的生物矿化-吸附作用是稳定尾矿中Cd和Pb的主要作用，且生物矿化作用的贡献远大于生物吸附作用。

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来源期刊

Chemistry and Ecology 环境科学-环境科学

CiteScore

4.20

自引率

16.00%

发文量

审稿时长

3.7 months

期刊介绍： Chemistry and Ecology publishes original articles, short notes and occasional reviews on the relationship between chemistry and ecological processes. This journal reflects how chemical form and state, as well as other basic properties, are critical in their influence on biological systems and that understanding of the routes and dynamics of the transfer of materials through atmospheric, terrestrial and aquatic systems, and the associated effects, calls for an integrated treatment. Chemistry and Ecology will help promote the ecological assessment of a changing chemical environment and in the development of a better understanding of ecological functions.