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Wu C, Jiang M, Hsieh L, Cai Y, Shen Y, Wang H, Lin Q, Shen C, Hu B, Lou L. Feasibility of bioleaching of heavy metals from sediment with indigenous bacteria using agricultural sulfur soil conditioners. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 703:134812. [PMID: 31734500 DOI: 10.1016/j.scitotenv.2019.134812] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/26/2019] [Revised: 09/30/2019] [Accepted: 10/02/2019] [Indexed: 06/10/2023]
Abstract
Sediment bioleaching using a sulfur substrate is a promising approach to the removal of heavy metals. Compared with commercial sulfur powder used as the sulfur substrate, agricultural sulfur soil conditioners may reduce secondary pollution and facilitate the reuse of sediment. This study explored the bioleaching effect of three agricultural sulfur soil conditioners, including sulfur-coated urea, bentonite sulfur, and bio-sulfur, and the bioleaching potential of the indigenous sediment bacteria. The results showed that the sulfur-coated urea had a comparable bioleaching effect with sulfur powder (Ni 35.35%, Cu 74.27%, Zn 69.92%) and the highest maximum bioleaching rate because of the additional nitrogen. The bentonite sulfur leached the least but increased the proportion of the residual state due to its adsorption of heavy metal. Similar changes to the microbial flora structure and bioleaching mechanism were found with the use of sulfur powder, sulfur-coated urea, and bentonite sulfur as the bioleaching substrate. There was no significant difference between the indigenous bacteria and the sludge-enriched bacteria in the bioleaching effect except for bio-sulfur, which only performed well with the sludge-enriched bacteria. In the absence of inoculum, the bio-sulfur hindered the bioleaching process due to high levels of organic matter. This study provides insights into the practical application of bioleaching heavy metal removal technology from the perspective of sulfur substrate selection.
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Affiliation(s)
- Chuncheng Wu
- Department of Environmental Engineering, Zhejiang University, Hangzhou 310029, People's Republic of China.
| | - Mengying Jiang
- Department of Environmental Engineering, Zhejiang University, Hangzhou 310029, People's Republic of China
| | - Lichun Hsieh
- Department of Environmental Engineering, Zhejiang University, Hangzhou 310029, People's Republic of China
| | - Yuchen Cai
- Department of Environmental Engineering, Zhejiang University, Hangzhou 310029, People's Republic of China
| | - Yutao Shen
- Department of Environmental Engineering, Zhejiang University, Hangzhou 310029, People's Republic of China
| | - Haizhen Wang
- Department of Environmental Engineering, Zhejiang University, Hangzhou 310029, People's Republic of China.
| | - Qi Lin
- Department of Environmental Engineering, Zhejiang University, Hangzhou 310029, People's Republic of China.
| | - Chaofeng Shen
- Department of Environmental Engineering, Zhejiang University, Hangzhou 310029, People's Republic of China.
| | - Baolan Hu
- Department of Environmental Engineering, Zhejiang University, Hangzhou 310029, People's Republic of China.
| | - Liping Lou
- Department of Environmental Engineering, Zhejiang University, Hangzhou 310029, People's Republic of China; Key Laboratory of Water Pollution Control and Environmental Safety of Zhejiang Province 310020, People's Republic of China.
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Xu M, Liu Y, Deng Y, Zhang S, Hao X, Zhu P, Zhou J, Yin H, Liang Y, Liu H, Liu X, Bai L, Jiang L, Jiang H. Bioremediation of cadmium-contaminated paddy soil using an autotrophic and heterotrophic mixture. RSC Adv 2020; 10:26090-26101. [PMID: 35519775 PMCID: PMC9055442 DOI: 10.1039/d0ra03935g] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2020] [Accepted: 06/26/2020] [Indexed: 12/02/2022] Open
Abstract
Cadmium (Cd) pollution poses a serious risk to human health and ecological security. Bioremediation can be a promising and effective remediation technology for treating Cd contaminated soils. In this study, seven heterotrophic strains were isolated from Cd contaminated soil and 7 autotrophic strains were isolated from acid mine drainage. Cd removal efficiencies were compared after leaching with autotrophic bacteria (Att-sys), heterotrophic isolates (Htt-sys) and cooperative leaching systems (Co-sys) in laboratory agitating reactors. The results indicated that Cd removal efficiency of Co-sys (32.09%) was significantly higher than that of Att-sys (23.24%) and Htt-sys (0.74%). By analyzing the soil microbial community in different bioleaching systems, we found that the addition of heterotrophic isolates significantly promoted the growth of some heavy metal resistant inhabitants (Massilia, Alicyclobacillus, Micromonospora, etc.), and Co-sys had a minor effect on the growth of soil indigenous microbes. In Co-sys, the content of the four Cd fractions all decreased compared with other leaching systems. The analysis of soil physicochemical parameters during the leaching process showed that pH and ORP (oxidation reduction potential) were not the only determinants for Cd removal efficiency in Co-sys, synergistic metabolic activities of autotrophic and heterotrophic strains may be other determinants. This study demonstrated that cooperative bioremediation may prove to be a safe and efficient technique for field application in heavy metal soil pollution. Bioremediation can be a promising and effective remediation technology for treating Cd contaminated soils. Cooperative bioremediation using heterotrophic and autotrophic mixtures proved to be an efficient, short-term bioremediation strategy for heavy metal contaminated soil.![]()
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Xia MC, Wang YP, Peng TJ, Shen L, Yu RL, Liu YD, Chen M, Li JK, Wu XL, Zeng WM. Recycling of metals from pretreated waste printed circuit boards effectively in stirred tank reactor by a moderately thermophilic culture. J Biosci Bioeng 2017; 123:714-721. [DOI: 10.1016/j.jbiosc.2016.12.017] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2016] [Accepted: 12/31/2016] [Indexed: 12/19/2022]
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Wang S, Zheng Y, Yan W, Chen L, Dummi Mahadevan G, Zhao F. Enhanced bioleaching efficiency of metals from E-wastes driven by biochar. JOURNAL OF HAZARDOUS MATERIALS 2016; 320:393-400. [PMID: 27585271 DOI: 10.1016/j.jhazmat.2016.08.054] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/17/2016] [Revised: 08/18/2016] [Accepted: 08/21/2016] [Indexed: 06/06/2023]
Abstract
Electronic wastes (E-wastes) contain a huge amount of valuable metals that are worth recovering. Bioleaching has attracted widespread attention as an environment-friendly and low-cost technology for the recycling of E-wastes. To avoid the disadvantages of being time-consuming or having a relatively low efficiency, biochar with redox activity was used to enhance bioleaching efficiency of metals from a basic E-waste (i.e., printed circuit boards in this study). The role of biochar was examined through three basic processes: Carbon-mediated, Sulfur-mediated and Iron-mediated bioleaching pathways. Although no obvious enhancement of bioleaching performance was observed in the C-mediated and S-mediated systems, Fe-mediated bioleaching was significantly promoted by the participation of biochar, and its leaching time was decreased by one-third compared with that of a biochar-free system. By mapping the dynamic concentration of Fe(II) and Cu(II), biochar was proved to facilitate the redox action between Fe(II) to Fe(III), which resulted in effective leaching of Cu. Two dominant functional species consisting of Alicyclobacillus spp. and Sulfobacillus spp. may cooperate in the Fe-mediated bioleaching system, and the ratio of these two species was regulated by biochar for enhancing the efficiency of bioleaching. Hence, this work provides a method to improve bioleaching efficiency with low-cost solid redox media.
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Affiliation(s)
- Shuhua Wang
- CAS Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China; University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Yue Zheng
- CAS Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China; University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Weifu Yan
- CAS Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China; University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Lixiang Chen
- CAS Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China; University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Gurumurthy Dummi Mahadevan
- CAS Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China
| | - Feng Zhao
- CAS Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China.
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Liu H, Yin H, Dai Y, Dai Z, Liu Y, Li Q, Jiang H, Liu X. The co-culture of Acidithiobacillus ferrooxidans and Acidiphilium acidophilum enhances the growth, iron oxidation, and CO2 fixation. Arch Microbiol 2011; 193:857-66. [PMID: 21691775 DOI: 10.1007/s00203-011-0723-8] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2011] [Revised: 06/01/2011] [Accepted: 06/06/2011] [Indexed: 11/28/2022]
Abstract
Although the synergetic interactions between chemolithoautotroph Acidithiobacillus ferrooxidans and heterotroph Acidiphilium acidophilum have drawn a share of attention, the influence of Aph. acidophilum on growth and metabolic functions of At. ferrooxidans is still unknown on transcriptional level. To assess this influence, a co-culture composed by At. ferrooxidans and Aph. acidophilum was successfully acclimated in this study. Depending on the growth dynamics, At. ferrooxidans in co-culture had 2 days longer exponential phase and 5 times more cell number than that in pure culture. The ferrous iron concentration in culture medium and the expression of iron oxidation-related genes revealed that the energy acquisition of At. ferrooxidans in co-culture was more efficient than that in pure culture. Besides, the analysis of CO2 fixation-related genes in At. ferrooxidans indicated that the second copy of RuBisCO-encoding genes cbbLS-2 and the positive regulator-encoding gene cbbR were up-regulated in co-culture system. All of these results verified that Aph. acidophilum could heterotrophically grow with At. ferrooxidans and promote the growth of it. By means of activating iron oxidation-related genes and the second set of cbbLS genes in At. ferrooxidans, the Aph. acidophilum facilitated the iron oxidation and CO2 fixation by At. ferrooxidans.
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Affiliation(s)
- Hongwei Liu
- School of Minerals Processing and Bioengineering, Central South University, Changsha, 410083, Hunan, China
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Bhowal S, Chakraborty R. Five novel acid-tolerant oligotrophic thiosulfate-metabolizing chemolithotrophic acid mine drainage strains affiliated with the genus Burkholderia of Betaproteobacteria and identification of two novel soxB gene homologues. Res Microbiol 2011; 162:436-45. [PMID: 21349327 DOI: 10.1016/j.resmic.2011.02.007] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2010] [Accepted: 01/28/2011] [Indexed: 11/28/2022]
Abstract
Five acid-tolerant thiosulfate-metabolizing bacteria were isolated from acid mine drainage samples from Garubathan, India. 16S rRNA gene analysis revealed that the strains were affiliated with the genus Burkholderia of the class of Betaproteobacteria. Comparative 16S rRNA gene sequence analyses indicated that the strains designated as GAH1 and GAH2 produced a separate phylogenetic branch having Burkholderia pyrrocinia ATCC 51958(T) (96-98%) as the closest relative. Strains GAH4 and Burkholderia tropica Ppe8(T) (93%) branched out separately in the phylogenetic tree. Strain GMX2 was most closely related to Burkholderia cepacia ATCC 25417(T) (99.6%) and Burkholderia vietnamiensis LMG 10929(T) (99%). Strain GAH5 was most closely related to B. pyrrocinia ATCC 51958(T) (98%). Oligotrophy has been demonstrated in all AMD strains of Burkholderia spp. All strains showed chemolithoautotrophic and mixotrophic growth in thiosulfate. Furthermore, cell-free extracts of all test strains possessed thiosulfate and sulfite dehydrogenase activities. Phylogenetic analysis of the soxB gene revealed that GAH4 and GAH2 strains formed a novel cluster, Betaproteobacteria II, having highest similarity with Allochromatium vinosum, a member of Gammaproteobacteria II.
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Affiliation(s)
- Suparna Bhowal
- Omics Laboratory, Department of Biotechnology, University of North Bengal, P.O. NBU, Siliguri 743013, West Bengal, India.
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