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Truu M, Ligi T, Nõlvak H, Peeb A, Tiirik K, Devarajan AK, Oopkaup K, Kasemets K, Kõiv-Vainik M, Kasak K, Truu J. Impact of synthetic silver nanoparticles on the biofilm microbial communities and wastewater treatment efficiency in experimental hybrid filter system treating municipal wastewater. JOURNAL OF HAZARDOUS MATERIALS 2022; 440:129721. [PMID: 35963093 DOI: 10.1016/j.jhazmat.2022.129721] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2022] [Revised: 07/22/2022] [Accepted: 08/04/2022] [Indexed: 06/15/2023]
Abstract
Silver nanoparticles (AgNPs) threaten human and ecosystem health, and are among the most widely used engineered nanomaterials that reach wastewater during production, usage, and disposal phases. This study evaluated the effect of a 100-fold increase in collargol (protein-coated AgNP) and Ag+ ions concentrations in municipal wastewater on the microbial community composition of the filter material biofilms (FMB) and the purification efficiency of the hybrid treatment system consisting of vertical (VF) and horizontal (HF) subsurface flow filters. We found that increased amounts of collargol and AgNO3 in wastewater had a modest effect on the prokaryotic community composition in FMB and did not significantly affect the performance of the studied system. Regardless of how Ag was introduced, 99.9% of it was removed by the system. AgNPs and AgNO3 concentrations did not significantly affect the purification efficiency of the system. AgNO3 induced a higher increase in the genetic potential of certain Ag resistance mechanisms in VFs than collargol; however, the increase in Ag resistance potential was similar for both substances in HF. Hence, the microbial community composition in biofilms of vertical and horizontal flow filters is largely resistant, resilient, or functionally redundant in response to AgNPs addition in the form of collargol.
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Affiliation(s)
- Marika Truu
- Institute of Molecular and Cell Biology, University of Tartu, Riia 23, 51010 Tartu, Estonia.
| | - Teele Ligi
- Institute of Molecular and Cell Biology, University of Tartu, Riia 23, 51010 Tartu, Estonia.
| | - Hiie Nõlvak
- Institute of Molecular and Cell Biology, University of Tartu, Riia 23, 51010 Tartu, Estonia.
| | - Angela Peeb
- Institute of Molecular and Cell Biology, University of Tartu, Riia 23, 51010 Tartu, Estonia.
| | - Kertu Tiirik
- Institute of Molecular and Cell Biology, University of Tartu, Riia 23, 51010 Tartu, Estonia.
| | - Arun Kumar Devarajan
- Institute of Molecular and Cell Biology, University of Tartu, Riia 23, 51010 Tartu, Estonia.
| | - Kristjan Oopkaup
- Institute of Molecular and Cell Biology, University of Tartu, Riia 23, 51010 Tartu, Estonia.
| | - Kaja Kasemets
- Laboratory of Environmental Toxicology, National Institute of Chemical Physics and Biophysics, Akadeemia tee 23, 12618 Tallinn, Estonia.
| | - Margit Kõiv-Vainik
- Institute of Ecology and Earth Sciences, University of Tartu, Vanemuise 46, 51014 Tartu, Estonia.
| | - Kuno Kasak
- Institute of Ecology and Earth Sciences, University of Tartu, Vanemuise 46, 51014 Tartu, Estonia.
| | - Jaak Truu
- Institute of Molecular and Cell Biology, University of Tartu, Riia 23, 51010 Tartu, Estonia.
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Mondal A, Sen K, Mondal A, Mishra D, Debnath P, Mondal NK. Bio-fabricated silver nanoparticles for controlling dengue and filaria vectors and their characterization, as well as toxicological risk assessment in aquatic mesocosms. ENVIRONMENTAL RESEARCH 2022; 212:113309. [PMID: 35487260 DOI: 10.1016/j.envres.2022.113309] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/08/2022] [Revised: 04/04/2022] [Accepted: 04/10/2022] [Indexed: 06/14/2023]
Abstract
The present study is focused on synthesis of silver nanoparticles from weeds and an assessment of their mosquito larvicidal efficacy. This study also presented the toxicological effects as well as the stability of these nanoparticles in aquatic mesocosms. The weed Digiteria sanguinallis was first time used for the synthesis of silver nanoparticles. The synthesized nanoparticles were characterized by various analytical techniques, such as UV-VIS, TEM, FESEM, EDX, XRD, FTIR, and zeta potential study. The result revealed that the nanoparticles are crystalline, spherical shape with band gap 2.44 eV, and average size 18 nm. The LC50 value of synthesized AgNPs were recorded as 7.47 and 6.31 mg/L at 24 h against Cx. quinquefasciatus and A. albopictus respectively. In contrast, larvicidal activity of weed extract was insignificant against two target species. In aquatic mesocosm study, AgNPs (LC50 dose) does not alter the nature of water parameters within experimental period. However only EC % and ORP were changes because of silver ion oxidation. In biochemical parameters, only stress enzymes for animal and plant species were moderately altered under long term exposure. But glycogen, protein, and AchE of two mosquito species were significantly changed under same mesocosm setup within short exposure. Comparatively, in control mesocosm, synthesized AgNPs are naturally change their nano form within 20 days with the presence of all non-target species and pond sediment. Therefore, it can be concluded that biosynthesized AgNPs could be used as a larvicidal agent in near future with negligible effects on aquatic organisms.
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Affiliation(s)
- Arghadip Mondal
- Environmental Chemistry Laboratory, Department of Environmental Science, The University of Burdwan, W.B, 713104, India
| | - Kamalesh Sen
- Environmental Chemistry Laboratory, Department of Environmental Science, The University of Burdwan, W.B, 713104, India
| | - Anupam Mondal
- Environmental Chemistry Laboratory, Department of Environmental Science, The University of Burdwan, W.B, 713104, India
| | - Debojyoti Mishra
- Environmental Chemistry Laboratory, Department of Environmental Science, The University of Burdwan, W.B, 713104, India
| | - Priyanka Debnath
- Environmental Chemistry Laboratory, Department of Environmental Science, The University of Burdwan, W.B, 713104, India
| | - Naba Kumar Mondal
- Environmental Chemistry Laboratory, Department of Environmental Science, The University of Burdwan, W.B, 713104, India.
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Mao J, Gu Z, Zhang S, An X, Lan H, Liu H, Qu J. Protonated carbon nitride elicits microalgae for water decontamination. WATER RESEARCH 2022; 222:118955. [PMID: 35963136 DOI: 10.1016/j.watres.2022.118955] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2022] [Revised: 07/31/2022] [Accepted: 08/04/2022] [Indexed: 06/15/2023]
Abstract
Comprehending the effects of synthetic nanomaterials on natural microorganisms is critical for the development of emerging nanotechnologies. Compared to artificial inactivation of microbes, the up-regulation of biological functions should be more attractive due to the possibility of discovering unexpected properties. Herein, a nanoengineering strategy was employed to tailor g-C3N4 for the metabolic regulation of algae. We found that surface protonated g-C3N4 (P-C3N4) as a nanopolymeric elicitor enabled the reinforced biological activity of Microcystis aeruginosa and Scenedesmus for harmful substances removal. Metabolomics analysis suggested that synthetic nanoarchitectures induced moderate oxidative stress of algae, with up-regulated biosynthesis of extracellular polymeric substances (EPS) for resisting the physiological damage caused by toxic substances in water. The formation of oxidative .O2- contributed to over five-fold enhancement in the biodecomposition of harmful aniline. Our study demonstrates a synergistic biotic-abiotic platform with valuable outcomes for various customized applications.
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Affiliation(s)
- Jie Mao
- Center for Water and Ecology, State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China; Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Zhenao Gu
- Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Shun Zhang
- Center for Water and Ecology, State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
| | - Xiaoqiang An
- Center for Water and Ecology, State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China.
| | - Huachun Lan
- Center for Water and Ecology, State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
| | - Huijuan Liu
- Center for Water and Ecology, State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
| | - Jiuhui Qu
- Center for Water and Ecology, State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China; Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
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Wang Z, Liao X, Wang X, Bai Y, Huang H, Shen K, Sun L, Liu B, Fan Z. Converting Complex Sewage Containing Oil, Silt, and Bacteria into Clean Water by a 3D Printed Multiscale and Multifunctional Filter. ACS APPLIED BIO MATERIALS 2021; 4:8509-8521. [PMID: 35005937 DOI: 10.1021/acsabm.1c01004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The exacerbating water pollution and water resource shortage pose a great danger to human health and make it imperative to recycle and treat the sewage. In this study, a direct-writing three-dimensional (3D) printing technology was adopted to prepare a 3D sodium alginate (SA)/graphene oxide (GO)/Ag nanoparticle (AgNP) aerogel (SGA), aiming to turn the complex sewage containing oil, silt, and bacteria into clean water depending only on gravity separation. The physicochemical properties and surface structure of the synthesized SGA were characterized by X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The swelling rate, mechanical properties, antibacterial properties, oil and water separation effect, and durable stability of the filter membrane were also investigated to verify the versatility of the SGA filter. The results showed that GO helped improve the mechanical properties of the printed filter to withstand water impact during the filtration process. The printed filter had a well-designed and multiscale gradient pore structure, which can effectively intercept particles with different sizes to separate the silt from water, and the turbidity of the filtered water can be reduced from 60 to 1 nephelometric turbidity unit (NTU). The presence of SA endowed the printed filter with hydrophilic and oleophobic behaviors, which can effectively separate various kinds of oils from water. The uniform distribution of AgNPs in the filter produced via a facile and green reduction of SA facilitated the efficient bactericidal ability of the printed filter during the filtration process; meanwhile, the lower release concentration of Ag ions ensured drinking safety. What is more, the filter can be easily produced on a large scale and used for different sewage treatment situations with a durable stability of over 30 days. Taken together, the printed SGA filter has a broad application prospect in complex sewage treatment, providing a special solution for sewage treatment in poverty areas.
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Affiliation(s)
- Zhilong Wang
- Key Laboratory of Dental Maxillofacial Reconstruction and Biological Intelligence Manufacturing, Gansu Province School of Stomatology, Lanzhou University, Lanzhou 730000, China
| | - Xiaozhu Liao
- Key Laboratory of Dental Maxillofacial Reconstruction and Biological Intelligence Manufacturing, Gansu Province School of Stomatology, Lanzhou University, Lanzhou 730000, China
| | - Xusen Wang
- Key Laboratory of Dental Maxillofacial Reconstruction and Biological Intelligence Manufacturing, Gansu Province School of Stomatology, Lanzhou University, Lanzhou 730000, China
| | - Yan Bai
- Key Laboratory of Dental Maxillofacial Reconstruction and Biological Intelligence Manufacturing, Gansu Province School of Stomatology, Lanzhou University, Lanzhou 730000, China
| | - Haofei Huang
- Key Laboratory of Dental Maxillofacial Reconstruction and Biological Intelligence Manufacturing, Gansu Province School of Stomatology, Lanzhou University, Lanzhou 730000, China
| | - Kuangyu Shen
- Polymer Program, Institute of Materials Science and Department of Chemical and Biomolecular Engineering, University of Connecticut, Storrs, Connecticut 06269, United States
| | - Luyi Sun
- Polymer Program, Institute of Materials Science and Department of Chemical and Biomolecular Engineering, University of Connecticut, Storrs, Connecticut 06269, United States
| | - Bin Liu
- Key Laboratory of Dental Maxillofacial Reconstruction and Biological Intelligence Manufacturing, Gansu Province School of Stomatology, Lanzhou University, Lanzhou 730000, China
| | - Zengjie Fan
- Key Laboratory of Dental Maxillofacial Reconstruction and Biological Intelligence Manufacturing, Gansu Province School of Stomatology, Lanzhou University, Lanzhou 730000, China
- State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China
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Luo J, Guo X, Liang J, Song Y, Liu Y, Li J, Du Y, Mu Q, Jiang Y, Zhao H, Li T. The influence of elevated CO 2 on bacterial community structure and its co-occurrence network in soils polluted with Cr 2O 3 nanoparticles. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 779:146430. [PMID: 33752002 DOI: 10.1016/j.scitotenv.2021.146430] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/06/2021] [Revised: 02/10/2021] [Accepted: 03/08/2021] [Indexed: 06/12/2023]
Abstract
Elevated CO2 (eCO2) and nanoparticles release are considered among the most noteworthy global concerns as they may impose negative effects on human health and ecosystem functioning. A mechanistic understanding of their combined impacts on soil microbiota is essential due to the profound eCO2 effect on soil biogeochemical processes. In this study, the impacts of Cr2O3 nanoparticles (nano-Cr2O3) on the activity, structure and co-occurrence networks of bacterial communities under ambient and eCO2 were compared between a clay loam and a sandy loam soil. We showed that eCO2 substantially mitigated nano-Cr2O3 toxicity, with microbial biomass, enzyme activity and bacterial alpha-diversity in clay loam soil were much higher than those in sandy loam soil. Nano-Cr2O3 addition caused an increase in alpha-diversity except for clay loam soil samples under eCO2. 16S rRNA gene profiling data found eCO2 remarkably reduced community divergences induced by nano-Cr2O3 more efficiently in clay loam soil (P < 0.05). Network analyses revealed more complex co-occurrence network architectures in clay loam soil than in sandy loam soil, however, nano-Cr2O3 decreased but eCO2 increased modularity and network complexity. Rising CO2 favoured the growth of oligotrophic (Acidobacteriaceae, Bryobacteraceae) rather than the copiotrophic bacteria (Sphingomonadaceae, Caulobacteraceae, Bacteroidaceae), which may contribute to community recovery and increase available carbon utilization efficiency. Our results suggested that the degree to which eCO2 mitigates nano-Cr2O3 toxicity is soil dependent, which could be related to the variation in clay and organic matter content, resilience of the resistant bacterial taxa, and microbial network complexity in distinct soils.
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Affiliation(s)
- Jipeng Luo
- Ministry of Education Key Laboratory of Environmental Remediation and Ecological Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China
| | - Xinyu Guo
- Ministry of Education Key Laboratory of Environmental Remediation and Ecological Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China
| | - Jiabin Liang
- Ministry of Education Key Laboratory of Environmental Remediation and Ecological Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China
| | - Yuchao Song
- Ministry of Education Key Laboratory of Environmental Remediation and Ecological Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China
| | - Yuankun Liu
- Ministry of Education Key Laboratory of Environmental Remediation and Ecological Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China
| | - Jinxing Li
- Ministry of Education Key Laboratory of Environmental Remediation and Ecological Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China
| | - Yilin Du
- Ministry of Education Key Laboratory of Environmental Remediation and Ecological Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China
| | - Qili Mu
- Ministry of Education Key Laboratory of Environmental Remediation and Ecological Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China
| | - Yue Jiang
- Ministry of Education Key Laboratory of Environmental Remediation and Ecological Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China
| | - Heping Zhao
- Ministry of Education Key Laboratory of Environmental Remediation and Ecological Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China
| | - Tingqiang Li
- Ministry of Education Key Laboratory of Environmental Remediation and Ecological Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China; Zhejiang Provincial Key Laboratory of Agricultural Resources and Environment, Hangzhou 310058, China; National Demonstration Center for Experimental Environment and Resources Education, Zhejiang University, Hangzhou 310058, China.
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6
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Xu J, Li Y, Wang H, Zhu M, Feng W, Liang G. Enhanced Antibacterial and Anti-Biofilm Activities of Antimicrobial Peptides Modified Silver Nanoparticles. Int J Nanomedicine 2021; 16:4831-4846. [PMID: 34295158 PMCID: PMC8291838 DOI: 10.2147/ijn.s315839] [Citation(s) in RCA: 29] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2021] [Accepted: 06/16/2021] [Indexed: 01/03/2023] Open
Abstract
Background The biofilms could protect bacteria from antibiotics and promote the production of drug-resistant strains, making the bacteria more difficult to be eradicated. Thus, we developed an AMP@PDA@AgNPs nanocomposite, which is formed by modifying silver nanoparticles (AgNPs) with antimicrobial peptides (AMP) modified nanocomposite to destroy biofilm in this study. Methods The AMP@PDA@AgNPs nanocomposite was prepared with polymerization method and characterized by using ultraviolet-visible (UV-vis) spectroscopy, dynamic light scattering (DLS), Fourier transform-infrared spectroscopy (FT-IR), and transmission electron microscope (TEM). The antibacterial effects of the nanocomposite were investigated by using agar diffusion method and minimum inhibitory concentration (MIC) test. The quantitative analysis of the biofilm formation by the nanocomposite was conducted using crystal violet staining and confocal laser scanning microscope (CLSM). Results The DLS and TEM analysis showed it was a spherical nanocomposite with 200 nm size and well dispersed . The results of UV-vis and FT-IR confirmed the presence of AMP and AgNPs. The nanocomposite had an excellent biocompatibility at 100 μg/mL. And the AMP@PDA@AgNPs nanocomposite showed superior antimicrobial activity against both Gram-negative (E. coli, P. aeruginosa) and Gram-positive (S. aureus) bacteria than AgNPs or AMP. Importantly, the mRNA expression of biofilm-related genes were decreased under the action of the nanocomposites. Conclusion An AMP@PDA@AgNPs nanocomposite with good biocompatibility was successfully prepared. The nanocomposite could destruct bacterial biofilms by inhibiting the expression of biofilm-related genes. The synergistic strategy of AMPs and AgNPs could provide a new perspective for the treatment of bacterial infection.
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Affiliation(s)
- Juanjuan Xu
- School of Basic Medical Sciences, Henan University of Science and Technology, Luoyang, 471023, People's Republic of China
| | - Yuanpei Li
- School of Basic Medical Sciences, Henan University of Science and Technology, Luoyang, 471023, People's Republic of China
| | - Haojie Wang
- School of Basic Medical Sciences, Henan University of Science and Technology, Luoyang, 471023, People's Republic of China
| | - Mengxi Zhu
- School of Basic Medical Sciences, Henan University of Science and Technology, Luoyang, 471023, People's Republic of China
| | - Wenpo Feng
- Medical College, Pingdingshan University, Pingdingshan, 467000, Henan, People's Republic of China
| | - Gaofeng Liang
- School of Basic Medical Sciences, Henan University of Science and Technology, Luoyang, 471023, People's Republic of China
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Zulfiqar F, Ashraf M. Nanoparticles potentially mediate salt stress tolerance in plants. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2021; 160:257-268. [PMID: 33529801 DOI: 10.1016/j.plaphy.2021.01.028] [Citation(s) in RCA: 68] [Impact Index Per Article: 22.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2020] [Accepted: 01/18/2021] [Indexed: 05/04/2023]
Abstract
In the era of climate change, salt stress is a promising threat to agriculture, limiting crop production via imposing primary effects such as osmotic and ionic, as well as secondary effects such as oxidative stress, perturbance in hormonal homeostasis, and nutrient imbalance. On the other hand, production areas are expanding into the salt affected regions due to excessive pressure for fulfilling food security targets to meet the needs of continuously increasing human population. Accumulating evidences demonstrate that supplementation of nanoparticles to plants can significantly alleviate the injurious effects caused by various harsh conditions including salt stress, and hence, regulate adaptive mechanisms in plants. Various types of NPs and nanofertilizers have shown a promising evidence so far regarding salt stress management. In this review, we recapitulate recent pioneering progress made towards acquiring salt stress tolerance in crop plants utilizing NPs. Finally, future research directions in this domain to explicate the comprehensive roles of nanoparticles in improving salt tolerance in plants are underscored. To ensure social acceptance and safe use of NPs, some conclusive directions have been elaborated in order to achieve sustainable progress in crop production under saline environments.
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Affiliation(s)
- Faisal Zulfiqar
- Institute of Horticultural Sciences, Faculty of Agriculture, University of Agriculture Faisalabad, Pakistan.
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Guo B, Zhang Y, Yu N, Liu Y. Impacts of conductive materials on microbial community during syntrophic propionate oxidization for biomethane recovery. WATER ENVIRONMENT RESEARCH : A RESEARCH PUBLICATION OF THE WATER ENVIRONMENT FEDERATION 2021; 93:84-93. [PMID: 32391609 DOI: 10.1002/wer.1357] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2020] [Revised: 04/21/2020] [Accepted: 04/26/2020] [Indexed: 06/11/2023]
Abstract
Propionate is one of the most important intermediates in anaerobic digestion, and its degradation requires a syntrophic partnership between propionate-oxidizing bacteria and hydrogenotrophic methanogens. Anaerobic digestion efficiency can be improved by direct interspecies electron transfer (DIET) through conductive materials. This study aimed to investigate the effects of DIET on syntrophic propionate oxidization under room temperature (20°C) and reveal the syntrophic partners. Firstly, conventional anaerobic consortium and conductive material-enriched consortium were tested for DIET under high H2 partial pressure. The latter supplemented with granular activated carbon (GAC) can mitigate H2 inhibition through DIET. Secondly, a DIET consortium was enriched for testing GAC and magnetite, both showed DIET facilitation. Microbial communities in GAC- and magnetite-supplemented reactors were similar. Syntrophic propionate-oxidizing bacteria, for example, Smithella (3.9%-9.9%) and a genus from the family Syntrophaceae (1.9%-3.6%) and methanogens Methanobacterium (30.3%-75.2%), Methanolinea (8.5%-25.2%), Methanosaeta (11.4%-36.7%), and Candidatus Methanofastidiosum (3.6%-6.6%), were predominant. Functional genes for cell mobility and membrane transport (3.3% and 9.5% in control reactor) increased with GAC (3.7% and 11.1%, respectively) and magnetite (3.7% and 10.9%, respectively) addition. Syntrophic propionate-oxidizing bacteria and methanogenesis partners were revealed by co-occurrence network, for example, Methanobacterium with Smithella, Syntrophobacter, Dechloromonas, and Trichococcus, signifying the importance of the syntrophic partnership in DIET environment. PRACTITIONER POINTS: DIET improved syntrophic propionate oxidization under room temperature condition (20°C). Microbial communities were similar for GAC- and magnetite-supplemented reactors, different with control reactor. Syntrophic propionate-oxidizing bacteria and methanogenesis partners were revealed by co-occurrence network. Methanobacterium and Smithella, Syntrophobacter, Dechloromonas, and Trichococcus were correlated.
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Affiliation(s)
- Bing Guo
- Department of Civil and Environmental Engineering, University of Alberta, Edmonton, AB, Canada
| | - Yingdi Zhang
- Department of Civil and Environmental Engineering, University of Alberta, Edmonton, AB, Canada
| | - Najiaowa Yu
- Department of Civil and Environmental Engineering, University of Alberta, Edmonton, AB, Canada
| | - Yang Liu
- Department of Civil and Environmental Engineering, University of Alberta, Edmonton, AB, Canada
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Ahmed T, Noman M, Shahid M, Niazi MBK, Hussain S, Manzoor N, Wang X, Li B. Green synthesis of silver nanoparticles transformed synthetic textile dye into less toxic intermediate molecules through LC-MS analysis and treated the actual wastewater. ENVIRONMENTAL RESEARCH 2020; 191:110142. [PMID: 32898565 DOI: 10.1016/j.envres.2020.110142] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2020] [Revised: 08/07/2020] [Accepted: 08/24/2020] [Indexed: 05/02/2023]
Abstract
The illegal disposal of waste from textile industries having recalcitrant pollutants is a worldwide problem with more severity in developing nations. We used an ecofriendly method to synthesize silver nanoparticles (AgNPs) from a locally-isolated bacterial strain Bacillus marisflavi TEZ7 and employed them as photocatalysts to degrade not only synthetic azo dyes but also actual textile effluents followed by phytotoxicity evaluation and identification of degradation molecules. The strain TEZ7 was taxonomically identified through the 16S rRNA gene sequence analysis. Biogenic AgNPs were characterized for stabilizing molecules, crystal structure, size, shape and elemental composition by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) analysis, transmission electron microscopy (TEM), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS), respectively. The photocatalytic degradation efficiency of biogenic AgNPs for three azo dyes such as Direct Blue-1, Methyl Red, and Reactive Black-5 ranged between 54.14 and 96.92% after 5 h of sunlight exposure at a concentration of 100 mg/L. Moreover, the actual wastewater treatment analysis revealed that the 100 mg/L dose of AgNPs significantly decreased the concentration of various physico-chemical parameters of textile effluents such as pH, EC, chlorides, sulphates, hardness, BOD, COD, TSS and TDS. Furthermore, six intermediate molecules of methyl red degradation were identified by LC-MS and it was established by a pot study that these degradation molecules have no phytotoxic effects on rice plants. It was concluded that the AgNPs can be used as an efficient and low-cost strategy for the degradation of azo dyes containing textile wastewaters.
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Affiliation(s)
- Temoor Ahmed
- State Key Laboratory of Rice Biology and Ministry of Agriculture Key Laboratory of Molecular Biology of Crop Pathogens and Insects, Institute of Biotechnology, Zhejiang University, 310058, Hangzhou, China; Department of Bioinformatics and Biotechnology, Government College University, Faisalabad, 38000, Pakistan
| | - Muhammad Noman
- State Key Laboratory of Rice Biology and Ministry of Agriculture Key Laboratory of Molecular Biology of Crop Pathogens and Insects, Institute of Biotechnology, Zhejiang University, 310058, Hangzhou, China; Department of Bioinformatics and Biotechnology, Government College University, Faisalabad, 38000, Pakistan
| | - Muhammad Shahid
- Department of Bioinformatics and Biotechnology, Government College University, Faisalabad, 38000, Pakistan.
| | - Muhammad Bilal Khan Niazi
- School of Chemical and Materials Engineering (SCME), National University of Sciences & Technology (NUST), Sector H-12, 44000, Islamabad, Pakistan
| | - Sabir Hussain
- Department of Environmental Science & Engineering, Government College University, Faisalabad, 38000, Pakistan
| | - Natasha Manzoor
- Department of Soil and Water Sciences, China Agricultural University, Beijing, 100193, China
| | - Xiaoxuan Wang
- State Key Laboratory of Rice Biology and Ministry of Agriculture Key Laboratory of Molecular Biology of Crop Pathogens and Insects, Institute of Biotechnology, Zhejiang University, 310058, Hangzhou, China
| | - Bin Li
- State Key Laboratory of Rice Biology and Ministry of Agriculture Key Laboratory of Molecular Biology of Crop Pathogens and Insects, Institute of Biotechnology, Zhejiang University, 310058, Hangzhou, China.
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10
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The Fate of Anthropogenic Nanoparticles, nTiO2 and nCeO2, in Waste Water Treatment. WATER 2020. [DOI: 10.3390/w12092509] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/06/2022]
Abstract
Wastewater treatment is one of the main end-of-life scenarios, as well as a possible reentry point into the environment, for anthropogenic nanoparticles (NP). These can be released from consumer products such as sunscreen or antibacterial clothing, from health-related applications or from manufacturing processes such as the use of polishing materials (nCeO2) or paints (nTiO2). The use of NP has dramatically increased over recent years and initial studies have examined the possibility of toxic or environmentally hazardous effects of these particles, as well as their behavior when released. This study focuses on the fate of nTiO2 and nCeO2 during the wastewater treatment process using lab scale wastewater treatment systems to simulate the NP mass flow in the wastewater treatment process. The feasibility of single particle mass spectroscopy (sp-ICP-MS) was tested to determine the NP load. The results show that nTiO2 and nCeO2 are adsorbed to at least 90 percent of the sludge. Furthermore, the results indicate that there are processes during the passage of the treatment system that lead to a modification of the NP shape in the effluent, as NP are observed to be partially smaller in effluent than in the added solution. This observation was made particularly for nCeO2 and might be due to dissolution processes or sedimentation of larger particles during the passage of the treatment system.
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11
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Guo B, Zhang Y, Zhang L, Zhou Y, Liu Y. RNA-based spatial community analysis revealed intra-reactor variation and expanded collection of direct interspecies electron transfer microorganisms in anaerobic digestion. BIORESOURCE TECHNOLOGY 2020; 298:122534. [PMID: 31835200 DOI: 10.1016/j.biortech.2019.122534] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2019] [Revised: 11/27/2019] [Accepted: 11/28/2019] [Indexed: 06/10/2023]
Abstract
Granular activated carbon (GAC) has been shown to mediate direct interspecies electron transfer (DIET) in anaerobic digestion. Adding GAC to up-flow anaerobic sludge bed reactor increased the total biomass slightly from 20.0 to 26.6 gVSS/reactor, and maximum organic removal capacity remarkably from 285 to 1660 mgCOD/L/d. Since GAC occupied 7% of reactor volume (denser than suspended sludge, settled to the reactor bottom), we used a spatial sampling strategy (sludge bed top/mid/bottom layers, and tightly attached GAC-biofilm) and DNA- and RNA-based community analyses. RNA-based analysis demonstrated significant community differences between the non-GAC and GAC-amended reactors (p < 0.05) based on ANOSIM statistical analysis. In comparison, DNA-based analysis showed little community difference between these reactors (p > 0.05). RNA-based analysis revealed active enrichments in GAC-biofilm, including bacteria Geobacter, Syntrophus, Desulfovibrio and Blvii28, and archaea Methanosaeta and Methanospirillum. These are potential electro-active syntrophic microorganisms related with DIET, which expand the previously defined list of DIET microorganisms.
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Affiliation(s)
- Bing Guo
- Department of Civil and Environmental Engineering, University of Alberta, T6G 1H9 Edmonton, Canada
| | - Yingdi Zhang
- Department of Civil and Environmental Engineering, University of Alberta, T6G 1H9 Edmonton, Canada
| | - Lei Zhang
- Department of Civil and Environmental Engineering, University of Alberta, T6G 1H9 Edmonton, Canada
| | - Yun Zhou
- Department of Civil and Environmental Engineering, University of Alberta, T6G 1H9 Edmonton, Canada
| | - Yang Liu
- Department of Civil and Environmental Engineering, University of Alberta, T6G 1H9 Edmonton, Canada.
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12
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Peng MW, Yu XL, Guan Y, Liu P, Yan P, Fang F, Guo J, Chen YP. Underlying Promotion Mechanism of High Concentration of Silver Nanoparticles on Anammox Process. ACS NANO 2019; 13:14500-14510. [PMID: 31794189 DOI: 10.1021/acsnano.9b08263] [Citation(s) in RCA: 44] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Silver nanoparticles (AgNPs) are largely discharged into sewers and mostly accumulated in the sediments and sludge. The toxicity of AgNPs to environmental microorganisms has attracted great attention. However, the effect of AgNPs on anaerobic ammonium-oxidizing (anammox) granules remains unknown. Here we present the underlying promotion mechanism of AgNPs on anammox granules from a morphological and molecular biology perspective. Our results demonstrate a positive effect of AgNPs on the proliferation of anammox bacteria. AgNPs resulted in a change in the three-dimensional structure of anammox granules and led to larger pore size and higher porosity. In addition, the diffusion capacity of the substrate and metal ions was enhanced. Furthermore, the expression of anammox-related enzymes, such as nitrite oxidoreductase (NirS), hydrazine dehydrogenase (Hdh), and hydrazine synthase (HZS), was upregulated. Therefore, the growth rate and the nitrogen removal performance of the anammox granules were improved. Our findings clarify the underlying mechanism of AgNPs on anammox granules and provide a promising method for the treatment of AgNPs-rich wastewater.
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Affiliation(s)
- Meng-Wen Peng
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environments of MOE , Chongqing University , Chongqing 400045 , China
| | - Xiu-Ling Yu
- Zhejiang Provincial Key Laboratory of Agricultural Resource and Environment , Zhejiang University , Hangzhou 310058 , China
| | - Yong Guan
- National Synchrotron Radiation Laboratory , University of Science and Technology of China , Hefei 230026 , China
| | - Peng Liu
- School of Environmental Studies , China University of Geosciences , Wuhan 430074 , China
| | - Peng Yan
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environments of MOE , Chongqing University , Chongqing 400045 , China
| | - Fang Fang
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environments of MOE , Chongqing University , Chongqing 400045 , China
| | - Jinsong Guo
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environments of MOE , Chongqing University , Chongqing 400045 , China
| | - You-Peng Chen
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environments of MOE , Chongqing University , Chongqing 400045 , China
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Ouyang J, Li C, Zhang G, Wei D, Wei L, Chang CC. Activated sludge and other aerobic suspended culture processes. WATER ENVIRONMENT RESEARCH : A RESEARCH PUBLICATION OF THE WATER ENVIRONMENT FEDERATION 2019; 91:992-1000. [PMID: 31220385 DOI: 10.1002/wer.1164] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/29/2019] [Accepted: 06/12/2019] [Indexed: 06/09/2023]
Abstract
The fields in the process model of activated sludge, the characteristics and species of microbial communities, dynamics and mechanism in the process, the influence of different xenobiotics on activated sludge, anaerobic digestion on waste activated sludge, and design and operation for activated sludge are reviewed in 2018. Contrast with the past reviews, several new highlights such as waste activated sludge treatment, antibiotic and heavy-metal xenobiotic, and pretreatment for anaerobic digestion are mentioned in 2018, which indicated that the research tendency of activated sludge from wastewater treatment to waste sludge treatment in the retrieved literature is developing. PRACTITIONER POINTS: None.
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Affiliation(s)
- Jia Ouyang
- Guangzhou HKUST Fok Ying Tung Research Institute, Guangzhou, China
| | - Chunying Li
- School of Energy and Civil Engineering, Harbin University of Commerce, Harbin, China
| | - Guocai Zhang
- College of Forestry, Northeast Forestry University, Harbin, China
| | - Dong Wei
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, Heilongjiang Province, China
| | - Li Wei
- Guangzhou HKUST Fok Ying Tung Research Institute, Guangzhou, China
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, Heilongjiang Province, China
| | - Chein-Chi Chang
- Department of Engineering and Technical Services, DC Water and Sewer Authority, Washington, District of Columbia, USA
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Alizadeh S, Abdul Rahim A, Guo B, Hawari J, Ghoshal S, Comeau Y. Impacts of Continuous Inflow of Low Concentrations of Silver Nanoparticles on Biological Performance and Microbial Communities of Aerobic Heterotrophic Wastewater Biofilm. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2019; 53:9148-9159. [PMID: 31294965 DOI: 10.1021/acs.est.9b01214] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Attached-growth wastewater processes are currently used in water resource recovery facilities (WRRFs) for required upgrades due to an increase in influent loading or to reach more stringent discharge criteria. Yet, the distribution and long-term inhibitory effects of silver nanoparticles (AgNPs) in attached-growth biological wastewater processes and their impact on involved microbial communities are poorly understood at relevant, low concentrations. Retention, distribution, and long-term inhibitory effect of polyvinylpyrrolidone (PVP)-coated AgNPs were evaluated in bench-scale moving bed biofilm reactors (MBBRs), achieving soluble organic matter removal, over a 64 day exposure to nominal concentrations of 10 and 100 μg/L. Distributions of continuously added AgNPs were characterized in the influent, bioreactor, and effluent of MBBRs using single particle inductively coupled plasma mass spectroscopy (spICP-MS). Aerobic heterotrophic biofilms in MBBRs demonstrated limited retention capacity for AgNPs over long-term exposure, with release of AgNPs, and Ag-rich biofilm sloughed from the carriers. Continuous exposure to both influent AgNP concentrations significantly decreased soluble chemical oxygen demand (SCOD) removal efficiency (11% to 31%) and reduced biofilm viability (8% to 30%). Specific activities of both intracellular dehydrogenase (DHA) and extracellular α-glucosidase (α-Glu) and protease (PRO) enzymes were significantly inhibited (8% to 39%) with an observed NP dose-dependent intracellular reactive oxygen species (ROS) production and shift in biofilm microbial community composition by day 64. Our results indicated that long-term exposure to AgNPs in biofilm processes at environmentally relevant concentrations can impact the treatment process stability and the quality of the discharged effluent.
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Affiliation(s)
- Sanaz Alizadeh
- Department of Civil, Geological and Mining Engineering , Polytechnique Montreal , 2500 Polytechnique road , Montreal ( Quebec ) Canada H3T 1J4
| | - Arshath Abdul Rahim
- Department of Civil Engineering , McGill University , 817 Sherbrooke Street West , Montreal ( Quebec ) Canada H3A 0C3
| | - Bing Guo
- Department of Civil Engineering , McGill University , 817 Sherbrooke Street West , Montreal ( Quebec ) Canada H3A 0C3
| | - Jalal Hawari
- Department of Civil, Geological and Mining Engineering , Polytechnique Montreal , 2500 Polytechnique road , Montreal ( Quebec ) Canada H3T 1J4
| | - Subhasis Ghoshal
- Department of Civil Engineering , McGill University , 817 Sherbrooke Street West , Montreal ( Quebec ) Canada H3A 0C3
| | - Yves Comeau
- Department of Civil, Geological and Mining Engineering , Polytechnique Montreal , 2500 Polytechnique road , Montreal ( Quebec ) Canada H3T 1J4
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Radwan IM, Gitipour A, Potter PM, Dionysiou DD, Al-Abed SR. Dissolution of Silver Nanoparticles in Colloidal Consumer Products: Effects of Particle Size and Capping Agent. JOURNAL OF NANOPARTICLE RESEARCH : AN INTERDISCIPLINARY FORUM FOR NANOSCALE SCIENCE AND TECHNOLOGY 2019; 21:1-155. [PMID: 32184700 PMCID: PMC7077831 DOI: 10.1007/s11051-019-4597-z] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2019] [Accepted: 07/02/2019] [Indexed: 05/20/2023]
Abstract
The utilization of silver nanoparticles (AgNPs) in consumer products has significantly increased in recent years, primarily due to their antimicrobial properties. Increased use of AgNPs has raised ecological concerns. Once released into an aquatic environment, AgNPs may undergo oxidative dissolution leading to the generation of toxic Ag+. Therefore, it is critical to investigate the ecotoxicological potential of AgNPs and determine the physicochemical parameters that control their dissolution in aquatic environments. We have investigated the dissolution trends of aqueous colloidal AgNPs in five products, marketed as dietary supplements and surface sanitizers. The dissolution trends of AgNPs in studied products were compared to the dissolution trends of AgNPs in well-characterized laboratory-synthesized nanomaterials: citrate-coated AgNPs, polyvinylpyrrolidone-coated AgNPs, and branched polyethyleneimine-coated AgNPs. The characterization of the studied AgNPs included: particle size, anion content, metal content, silver speciation, and capping agent identification. There were small differences in the dissolved masses of Ag+ between products, but we did not observe any significant differences in the dissolution trends obtained for deionized water and tap water. The decrease of the dissolved mass of Ag+ in tap water could be due to the reaction between Ag+ and Cl-, forming AgCl and affecting their dissolution. We observed a rapid initial Ag+ release and particle size decrease for all AgNP suspensions due to the desorption of Ag+ from the nanoparticles surfaces. The observed differences in dissolution trends between AgNPs in products and laboratory-synthesized AgNPs could be caused by variances in capping agent, particle size, and total AgNP surface area in suspensions.
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Affiliation(s)
- Islam M. Radwan
- University of Cincinnati, Environmental Engineering and Science Program, Department of Chemical and Environmental Engineering (ChEE), 2600 Clifton Avenue, Cincinnati, OH 45221-001, United States
- National Institute of Oceanography and Fisheries , Marine Chemistry Department, Environmental Division, Qayet-Bey, Al-Anfoushy, Alexandria 21556, Egypt
| | - Alireza Gitipour
- Pegasus Technical Services, Inc., 46 E. Hollister St., Cincinnati, OH 45219, United States
| | - Phillip M. Potter
- Oak Ridge Institute for Science and Education, U.S. Environmental Protection Agency, National Risk Management Research Laboratory, 5995 Center Hill Avenue, Cincinnati, OH 45224, United States
| | - Dionysios D. Dionysiou
- University of Cincinnati, Environmental Engineering and Science Program, Department of Chemical and Environmental Engineering (ChEE), 2600 Clifton Avenue, Cincinnati, OH 45221-001, United States
| | - Souhail R. Al-Abed
- U.S. Environmental Protection Agency, National Risk Management Research Laboratory, 26 W. Martin Luther King Dr., Cincinnati, OH 45268, United States
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16
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Huang J, Cao C, Liu J, Yan C, Xiao J. The response of nitrogen removal and related bacteria within constructed wetlands after long-term treating wastewater containing environmental concentrations of silver nanoparticles. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 667:522-531. [PMID: 30833250 DOI: 10.1016/j.scitotenv.2019.02.396] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/16/2019] [Revised: 02/21/2019] [Accepted: 02/25/2019] [Indexed: 06/09/2023]
Abstract
The wide application of consumer products containing silver nanoparticles (AgNPs) inevitably results in their release into sewer systems and wastewater treatment plants, where they would encounter (and cause potential negative impacts) constructed wetlands (CWs), a complex biological system containing plants, substrate and microorganisms. Herein, the long-term effects of environmental AgNPs concentrations on nitrogen removal, key enzymatic activities and nitrogen-related microbes in constructed wetlands (CWs) were investigated. The short-term exposure (40 d) to AgNPs significantly inhibited TN and NH4+-N removal, and the inhibition degree had a positive relationship with AgNPs levels. After about 450 d exposure, 200 μg/L AgNPs could slightly increase average TN removal efficiency, while presence of 50 μg/L AgNPs showed no difference, compared to control. The NH4+-N removal in all CWs had no difference. The present study indicated that short-term AgNPs loading evidently reduced nitrogen removal, whereas long-term exposure to AgNPs showed no adverse impacts on NH4+-N removal and slightly stimulated TN removal, which was related to the increase of corresponding enzymatic activities. After exposing AgNPs for 450 d, the abundance of relative functional genes and the composition of key community structure were determined by qPCR and high-throughput sequencing, respectively. The results showed that the abundance of amoA and nxrA dramatically higher than control, whereas the abundance of nirK, nirS, nosZ and anammox 16S rRNA was slightly higher than control, but had no statistical difference, which accorded with the TN removal performance. The microbial community analysis showed that different AgNPs concentrations could affect the microbial diversity and structure. The changes of the relative abundance of nitrogen-related genera were associated with the impacts of AgNPs on the nitrogen removal performance. Overall, the AgNPs loading had impacts on the key enzymatic activities, the abundance of nitrogen-related genes and microbial community, thus finally affected the treatment performance of CWs.
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Affiliation(s)
- Juan Huang
- Department of Municipal Engineering, School of Civil Engineering, Southeast University, Nanjing 210096, China.
| | - Chong Cao
- Department of Municipal Engineering, School of Civil Engineering, Southeast University, Nanjing 210096, China
| | - Jialiang Liu
- Department of Municipal Engineering, School of Civil Engineering, Southeast University, Nanjing 210096, China
| | - Chunni Yan
- Department of Municipal Engineering, School of Civil Engineering, Southeast University, Nanjing 210096, China
| | - Jun Xiao
- Department of Municipal Engineering, School of Civil Engineering, Southeast University, Nanjing 210096, China
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17
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Chen L, Hu Q, Zhang X, Cai Z, Wang Y. Effects of ZnO nanoparticles on the performance of anaerobic membrane bioreactor: An attention to the characteristics of supernatant, effluent and biomass community. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2019; 248:743-755. [PMID: 30851584 DOI: 10.1016/j.envpol.2019.02.051] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2018] [Revised: 01/24/2019] [Accepted: 02/17/2019] [Indexed: 06/09/2023]
Abstract
Two laboratory-scale anaerobic membrane bioreactor (AnMBRs) were built to investigate the effect of zinc oxide nanoparticles (ZnO-NPs) on their performance, and the recovery phase was also examined. Results showed that the addition of ZnO-NPs with 0.4 mg/L caused significant deteriorations of AnMBR performance, including decrements of chemical oxygen demand (COD) removal efficiency from 96.4% to 81.5% and biogas production from 0.36 to 0 L/g COD removal within 40 days. A significant increment from 13.2 to 52.1 mg/L in soluble microbial products (SMP) was obtained, while no obvious effect on colloids was observed except an increased fluctuation of colloid concentration. Additionally, gas chromatography-mass spectrometry (GC-MS) analysis revealed remarkable changes of compounds in effluent with exposure to ZnO-NPs, and some new alkanes and esters were produced, such as Cyclobutane, 1,2-diethyl-, trans-, Tetradecane, Cyclopropane, octyl-, and Butanoic acid, methyl ester. The microbial community was compared using high-throughput sequencing, clearly showing the changes in both bacteria and archaea communities. Furthermore, results for recovery phase indicated that the AnMBR performance can be recovered within around 60 days after stopping ZnO-NPs addition, accompanied by the decrement of zinc concentration mainly adsorbed by sludge.
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Affiliation(s)
- Lin Chen
- Key Laboratory of Integrated Regulation and Resources Development of Shallow Lakes, Hohai University, Nanjing, 210098, China; College of Environment, Hohai University, Nanjing, 210098, China.
| | - Qinzheng Hu
- Key Laboratory of Integrated Regulation and Resources Development of Shallow Lakes, Hohai University, Nanjing, 210098, China; College of Environment, Hohai University, Nanjing, 210098, China
| | - Xin Zhang
- School of Engineering, RMIT University, Melbourne, 3000, Australia
| | - Zongting Cai
- Engineering Sciences, University College London, London, WC1E 6BT, UK
| | - Yue Wang
- Key Laboratory of Integrated Regulation and Resources Development of Shallow Lakes, Hohai University, Nanjing, 210098, China; College of Environment, Hohai University, Nanjing, 210098, China
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Lewis RW, Bertsch PM, McNear DH. Nanotoxicity of engineered nanomaterials (ENMs) to environmentally relevant beneficial soil bacteria - a critical review. Nanotoxicology 2019; 13:392-428. [PMID: 30760121 DOI: 10.1080/17435390.2018.1530391] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Deposition of engineered nanomaterials (ENMs) in various environmental compartments is projected to continue rising exponentially. Terrestrial environments are expected to be the largest repository for environmentally released ENMs. Because ENMs are enriched in biosolids during wastewater treatment, agriculturally applied biosolids facilitate ENM exposure of key soil micro-organisms, such as plant growth-promoting rhizobacteria (PGPR). The ecological ramifications of increasing levels of ENM exposure of terrestrial micro-organisms are not clearly understood, but a growing body of research has investigated the toxicity of ENMs to various soil bacteria using a myriad of toxicity end-points and experimental procedures. This review explores what is known regarding ENM toxicity to important soil bacteria, with a focus on ENMs which are expected to accumulate in terrestrial ecosystems at the highest concentrations and pose the greatest potential threat to soil micro-organisms having potential indirect detrimental effects on plant growth. Knowledge gaps in the fundamental understanding of nanotoxicity to bacteria are identified, including the role of physicochemical properties of ENMs in toxicity responses, particularly in agriculturally relevant micro-organisms. Strategies for improving the impact of future research through the implementation of in-depth ENM characterization and use of necessary experimental controls are proposed. The future of nanotoxicological research employing microbial ecoreceptors is also explored, highlighting the need for continued research utilizing bacterial isolates while concurrently expanding efforts to study ENM-bacteria interactions in more complex environmentally relevant media, e.g. soil. Additionally, the particular importance of future work to extensively examine nanotoxicity in the context of bacterial ecosystem function, especially of plant growth-promoting agents, is proposed.
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Affiliation(s)
- Ricky W Lewis
- a Rhizosphere Science Laboratory, Department of Plant and Soil Sciences , University of Kentucky , Lexington , KY , USA
| | - Paul M Bertsch
- a Rhizosphere Science Laboratory, Department of Plant and Soil Sciences , University of Kentucky , Lexington , KY , USA.,b CSIRO Land and Water , Ecosciences Precinct , Brisbane , Australia.,c Center for the Environmental Implications of Nanotechnology (CEINT) , Duke University , Durham , NC , USA
| | - David H McNear
- a Rhizosphere Science Laboratory, Department of Plant and Soil Sciences , University of Kentucky , Lexington , KY , USA
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Liu Y, Yang Q, Feng R, Xu W, Yan L, Du B, Wei Q, Wei D. A magnetic activated sludge for Cu( ii) and Cd( ii) removal: adsorption performance and mechanism studies. NEW J CHEM 2019. [DOI: 10.1039/c9nj04198b] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In the present study, a novel magnetic activated sludge (MAS) was successfully synthesized and applied for heavy metal removal.
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Affiliation(s)
- Yingrui Liu
- School of Water Conservancy and Environment
- University of Jinan
- Jinan 250022
- P. R. China
| | - Qingwei Yang
- School of Water Conservancy and Environment
- University of Jinan
- Jinan 250022
- P. R. China
| | - Rui Feng
- School of Water Conservancy and Environment
- University of Jinan
- Jinan 250022
- P. R. China
| | - Weiying Xu
- School of Water Conservancy and Environment
- University of Jinan
- Jinan 250022
- P. R. China
| | - Liangguo Yan
- School of Water Conservancy and Environment
- University of Jinan
- Jinan 250022
- P. R. China
| | - Bin Du
- School of Water Conservancy and Environment
- University of Jinan
- Jinan 250022
- P. R. China
| | - Qin Wei
- School of Chemistry and Chemical Engineering
- University of Jinan
- Jinan 250022
- P. R. China
| | - Dong Wei
- School of Water Conservancy and Environment
- University of Jinan
- Jinan 250022
- P. R. China
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Zakaria BS, Barua S, Sharaf A, Liu Y, Dhar BR. Impact of antimicrobial silver nanoparticles on anode respiring bacteria in a microbial electrolysis cell. CHEMOSPHERE 2018; 213:259-267. [PMID: 30223131 DOI: 10.1016/j.chemosphere.2018.09.060] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2018] [Revised: 09/08/2018] [Accepted: 09/10/2018] [Indexed: 06/08/2023]
Abstract
This study assessed the impact of antimicrobial AgNPs (50 mg L-1, 30-50 nm) on the electrocatalytic activity of a mixed-culture anode biofilm enriched with Geobacter species. The current densities and electrochemical kinetics were maintained after exposure to AgNPs in consecutive fed-batch cycles, despite significant changes in morphological structures and bacterial communities. Bacterial community analysis showed a substantial increase in the Geobacter population in response to AgNPs exposure, indicating their higher tolerance to AgNPs. In contrast, the population of other anode respiring bacteria (ARB) belongs to Acinetobacter, Dysgonomonas, and Cloacibacillus genera appeared to be very sensitive to AgNPs toxicity as their relative abundance significantly decreased. Microscopic imaging showed that AgNPs were accumulated within anode biofilm matrix without penetration inside the cells. Moreover, the anode biofilm became denser because of enhanced extracellular polymeric substances (EPSs) production by ARB after exposure of AgNPs, implying that EPS could protect ARB against AgNPs toxicity.
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Affiliation(s)
- Basem S Zakaria
- Department of Civil and Environmental Engineering, University of Alberta, 9211-116 Street NW, Edmonton, AB, T6G 1H9, Canada
| | - Sajib Barua
- Department of Civil and Environmental Engineering, University of Alberta, 9211-116 Street NW, Edmonton, AB, T6G 1H9, Canada
| | - Ahmed Sharaf
- Department of Civil and Environmental Engineering, University of Alberta, 9211-116 Street NW, Edmonton, AB, T6G 1H9, Canada
| | - Yang Liu
- Department of Civil and Environmental Engineering, University of Alberta, 9211-116 Street NW, Edmonton, AB, T6G 1H9, Canada
| | - Bipro Ranjan Dhar
- Department of Civil and Environmental Engineering, University of Alberta, 9211-116 Street NW, Edmonton, AB, T6G 1H9, Canada.
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How Microbial Aggregates Protect against Nanoparticle Toxicity. Trends Biotechnol 2018; 36:1171-1182. [DOI: 10.1016/j.tibtech.2018.06.009] [Citation(s) in RCA: 94] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2018] [Revised: 06/12/2018] [Accepted: 06/20/2018] [Indexed: 12/21/2022]
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22
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Vilela P, Liu H, Lee S, Hwangbo S, Nam K, Yoo C. A systematic approach of removal mechanisms, control and optimization of silver nanoparticle in wastewater treatment plants. THE SCIENCE OF THE TOTAL ENVIRONMENT 2018; 633:989-998. [PMID: 29758920 DOI: 10.1016/j.scitotenv.2018.03.247] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/08/2017] [Revised: 03/01/2018] [Accepted: 03/21/2018] [Indexed: 06/08/2023]
Abstract
The release of silver nanoparticles (AgNPs) to wastewater caused by over-generation and poor treatment of the remaining nanomaterial has raised the interest of researchers. AgNPs can have a negative impact on watersheds and generate degradation of the effluent quality of wastewater treatment plants (WWTPs). The aim of this research is to design and analyze an integrated model system for the removal of AgNPs with high effluent quality in WWTPs using a systematic approach of removal mechanisms modeling, optimization, and control of the removal of silver nanoparticles. The activated sludge model 1 was modified with the inclusion of AgNPs removal mechanisms, such as adsorption/desorption, dissolution, and inhibition of microbial organisms. Response surface methodology was performed to minimize the AgNPs and total nitrogen concentrations in the effluent by optimizing operating conditions of the system. Then, the optimal operating conditions were utilized for the implementation of control strategies into the system for further analysis of enhancement of AgNPs removal efficiency. Thus, the overall AgNP removal efficiency was found to be slightly higher than 80%, which was an improvement of almost 7% compared to the BSM1 reference value. This study provides a systematic approach to find an optimal solution for enhancing AgNP removal efficiency in WWTPs and thereby to prevent pollution in the environment.
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Affiliation(s)
- Paulina Vilela
- Dept. of Environmental Science and Engineering, College of Engineering, Center for Environmental Studies, Kyung Hee University, Seocheon-dong 1, Giheung-gu, Yongin-Si, Gyeonggi-Do 446-701, Republic of Korea; ESPOL Polytechnic University, Escuela Superior Politécnica del Litoral, ESPOL, Facultad de Ingeniería en Ciencias de la Tierra, Campus Gustavo Galindo Km. 30.5 Vía Perimetral, P.O. Box 09-01-5863, Guayaquil, Ecuador
| | - Hongbin Liu
- Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, China; State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China
| | - SeungChul Lee
- Dept. of Environmental Science and Engineering, College of Engineering, Center for Environmental Studies, Kyung Hee University, Seocheon-dong 1, Giheung-gu, Yongin-Si, Gyeonggi-Do 446-701, Republic of Korea
| | - Soonho Hwangbo
- Dept. of Environmental Science and Engineering, College of Engineering, Center for Environmental Studies, Kyung Hee University, Seocheon-dong 1, Giheung-gu, Yongin-Si, Gyeonggi-Do 446-701, Republic of Korea
| | - KiJeon Nam
- Dept. of Environmental Science and Engineering, College of Engineering, Center for Environmental Studies, Kyung Hee University, Seocheon-dong 1, Giheung-gu, Yongin-Si, Gyeonggi-Do 446-701, Republic of Korea
| | - ChangKyoo Yoo
- Dept. of Environmental Science and Engineering, College of Engineering, Center for Environmental Studies, Kyung Hee University, Seocheon-dong 1, Giheung-gu, Yongin-Si, Gyeonggi-Do 446-701, Republic of Korea.
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Abstract
The concept of hormesis, as an adaptive response of biological systems to moderate environmental challenges, has raised considerable nano-toxicological interests in view of the rapid pace of production and application of even more innovative nanomaterials and the expected increasing likelihood of environmental and human exposure to low-dose concentrations. Therefore, the aim of this review is to provide an update of the current knowledge concerning the biphasic dose-responses induced by nanoparticle exposure. The evidence presented confirmed and extended our previous findings, showing that hormesis is a generalized adaptive response which may be further generalized to nanoscale xenobiotic challenges. Nanoparticle physico-chemical properties emerged as possible features affecting biphasic relationships, although the molecular mechanisms underlining such influences remain to be fully understood, especially in experimental settings resembling long-term and low-dose realistic environmental exposure scenarios. Further investigation is necessary to achieve helpful information for a suitable assessment of nanomaterial risks at the low-dose range for both the ecosystem function and the human health.
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