1
|
Gutiérrez MC, Cáceres A, Herruzo-Ruiz AM, Siles JA, Vázquez F, Alhama J, Michán C, Martín MA. Assessment of nitrification process in a sequencing batch reactor: Modelling and genomic approach. ENVIRONMENTAL RESEARCH 2024; 246:118035. [PMID: 38199477 DOI: 10.1016/j.envres.2023.118035] [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: 11/15/2023] [Revised: 12/19/2023] [Accepted: 12/22/2023] [Indexed: 01/12/2024]
Abstract
Nitrification of ammoniacal nitrogen (N-NH4+) to nitrate (N-NO3-) was investigated in a lab-scale sequencing batch reactor (SBR) to evaluate its efficiency. During the nitrification process the removal of N-NH4+ reached 96%, resulting in 73% formation of N-NO3-. A lineal correlation (r2 = 0.9978) was obtained between the concentration of volatile suspended solids (VSS) and the maximal N-NO3- concentration at the end of each batch cycle under stationary state. The bacterial taxons in the initial inoculum were identified, revealing a complex diverse community mainly in the two major bacterial phyla Proteobacteria and Actinobacteria. The FAPROTAX algorithm predicted the presence in the inoculum of taxa involved in relevant processes of the nitrogen metabolism, highlighting the bacterial genera Nitrospira and Nitrosomonas that are both involved in the nitrification process. A kinetic model was formulated for predicting and validating the transformation of N-NH4+, N-NO2- and N-NO3- and the removal of organic and inorganic carbon (TOC and IC, respectively). The results showed how the increase in biomass concentration slowed down the transformation to oxidised forms of nitrogen and increased denitrification in the settling and filling stages under free aeration conditions.
Collapse
Affiliation(s)
- M C Gutiérrez
- Department of Inorganic Chemistry and Chemical Engineering, Area of Chemical Engineering, Instituto Químico para la Energía y el Medioambiente (IQUEMA), Campus de Excelencia Internacional Agroalimentario ceiA3, University of Cordoba, Campus Universitario de Rabanales, Carretera N-IV, km 396, edificio Marie Curie, 14071, Córdoba, Spain
| | - A Cáceres
- Department of Inorganic Chemistry and Chemical Engineering, Area of Chemical Engineering, Instituto Químico para la Energía y el Medioambiente (IQUEMA), Campus de Excelencia Internacional Agroalimentario ceiA3, University of Cordoba, Campus Universitario de Rabanales, Carretera N-IV, km 396, edificio Marie Curie, 14071, Córdoba, Spain
| | - A M Herruzo-Ruiz
- Department of Biochemistry and Molecular Biology, University of Cordoba, Campus de Excelencia Internacional Agroalimentario ceiA3, edificio Severo Ochoa, 14071, Córdoba, Spain
| | - J A Siles
- Department of Inorganic Chemistry and Chemical Engineering, Area of Chemical Engineering, Instituto Químico para la Energía y el Medioambiente (IQUEMA), Campus de Excelencia Internacional Agroalimentario ceiA3, University of Cordoba, Campus Universitario de Rabanales, Carretera N-IV, km 396, edificio Marie Curie, 14071, Córdoba, Spain
| | - F Vázquez
- Department of Electrical Engineering and Automation, University of Cordoba, Cordoba, 14071, Spain
| | - J Alhama
- Department of Biochemistry and Molecular Biology, University of Cordoba, Campus de Excelencia Internacional Agroalimentario ceiA3, edificio Severo Ochoa, 14071, Córdoba, Spain
| | - C Michán
- Department of Biochemistry and Molecular Biology, University of Cordoba, Campus de Excelencia Internacional Agroalimentario ceiA3, edificio Severo Ochoa, 14071, Córdoba, Spain
| | - M A Martín
- Department of Inorganic Chemistry and Chemical Engineering, Area of Chemical Engineering, Instituto Químico para la Energía y el Medioambiente (IQUEMA), Campus de Excelencia Internacional Agroalimentario ceiA3, University of Cordoba, Campus Universitario de Rabanales, Carretera N-IV, km 396, edificio Marie Curie, 14071, Córdoba, Spain.
| |
Collapse
|
2
|
Xu Y, Li Q, Tang Y, Huang H, Ren H. Electrocatalytic denitrification biofilter for advanced purification of chlorophenols via ceramsite-based Ti/SnO 2-Sb particle electrode: Performance, microbial community structure and mechanism. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2024; 346:123594. [PMID: 38378077 DOI: 10.1016/j.envpol.2024.123594] [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: 12/15/2023] [Revised: 02/14/2024] [Accepted: 02/15/2024] [Indexed: 02/22/2024]
Abstract
In response to the demand for advanced purification of industrial secondary effluent, a new method has been developed for treating chlorophenol wastewater using the novel ceramsite-based Ti/SnO2-Sb particle electrodes (Ti/SnO2-Sb/CB) enhanced electrocatalytic denitrification biofilter (EDNBF-P) to achieve removal of chlorophenols (CPs), denitrification, and reduction of effluent toxicity. The results showed that significantly improved CPs and TN removal efficiency at low COD/N compared to conventional denitrification biofilter, with CPs removal rates increasing by 0.33%-59.27% and TN removal rates increasing by 12.53%-38.92%. Under the conditions of HRT = 2h, 3V voltage, charging times = 12h, and 25 °C, the concentrations of the CPs in the effluent of EDNBF-P were all below 1 mg/L, the TN concentration was below 15 mg/L, while the effluent toxicity reached the low toxicity level. Additionally, the Ti/SnO2-Sb/CB particle electrodes effectively alleviated the accumulation of NO2--N caused by applied voltage. The Silanimonas, Pseudomonas and Rhodobacter was identified as the core microorganism for denitrification and toxicity reduction. This study validated that EDNBF-P could achieve synergistic treatment of CPs and TN through electrocatalysis and microbial degradation, providing a methodological support for achieving advanced purification of chlorophenol wastewater with low COD/N in industrial applications.
Collapse
Affiliation(s)
- Yujin Xu
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, Jiangsu, PR China
| | - Qianqian Li
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, Jiangsu, PR China
| | - Yingying Tang
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, Jiangsu, PR China
| | - Hui Huang
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, Jiangsu, PR China.
| | - Hongqiang Ren
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, Jiangsu, PR China
| |
Collapse
|
3
|
Wang X, Wang Y, Fu Y, Zhai Y, Bai X, Liu T, Li G, Zeng L, Zhu S. Multiple omics revealed the growth-promoting mechanism of Bacillus velezensis strains on ramie. FRONTIERS IN PLANT SCIENCE 2024; 15:1367862. [PMID: 38601307 PMCID: PMC11004232 DOI: 10.3389/fpls.2024.1367862] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/09/2024] [Accepted: 03/15/2024] [Indexed: 04/12/2024]
Abstract
Beneficial bacteria that promote plant growth can shield plants from negative effects. Yet, the specific biological processes that drive the relationships between soil microbes and plant metabolism are still not fully understood. To investigate this further, we utilized a combination of microbiology and non-targeted metabolomics techniques to analyze the impact of plant growth-promoting bacteria on both the soil microbial communities and the metabolic functions within ramie (Boehmeria nivea) tissues. The findings indicated that the yield and traits of ramie plants are enhanced after treatment with Bacillus velezensis (B. velezensis). These B. velezensis strains exhibit a range of plant growth-promoting properties, including phosphate solubilization and ammonia production. Furthermore, strain YS1 also demonstrates characteristics of IAA production. The presence of B. velezensis resulted in a decrease in soil bacteria diversity, resulting in significant changes in the overall structure and composition of soil bacteria communities. Metabolomics showed that B. velezensis significantly altered the ramie metabolite spectrum, and the differential metabolites were notably enriched (P < 0.05) in five main metabolic pathways: lipid metabolism, nucleotide metabolism, amino acid metabolism, plant secondary metabolites biosynthesis, and plant hormones biosynthesis. Seven common differential metabolites were identified. Correlation analysis showed that the microorganisms were closely related to metabolite accumulation and yield index. In the B. velezensis YS1 and B. velezensis Y4-6-1 treatment groups, the relative abundances of BIrii41 and Bauldia were significantly positively correlated with sphingosine, 9,10,13-TriHOME, fresh weight, and root weight, indicating that these microorganisms regulate the formation of various metabolites, promoting the growth and development of ramie. Conclusively, B. velezensis (particularly YS1) played an important role in regulating soil microbial structure and promoting plant metabolism, growth, and development. The application of the four types of bacteria in promoting ramie growth provides a good basis for future application of biological fertilizers and bio-accelerators.
Collapse
Affiliation(s)
| | | | | | | | | | | | | | - Liangbin Zeng
- Institute of Bast Fiber Crops, Chinese Academy of Agricultural Sciences, Changsha, China
| | - Siyuan Zhu
- Institute of Bast Fiber Crops, Chinese Academy of Agricultural Sciences, Changsha, China
| |
Collapse
|
4
|
Sui Y, Cui YW, Huang JL, Xu MJ. Feast/famine ratio regulates the succession of heterotrophic nitrification-aerobic denitrification and autotrophic ammonia oxidizing bacteria in halophilic aerobic granular sludge treating saline wastewater. BIORESOURCE TECHNOLOGY 2024; 393:129995. [PMID: 37951552 DOI: 10.1016/j.biortech.2023.129995] [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: 07/31/2023] [Revised: 11/05/2023] [Accepted: 11/07/2023] [Indexed: 11/14/2023]
Abstract
Heterotrophic nitrification-aerobic denitrification (HN-AD) shows innovation potential of wastewater treatment process in a single tank. However, how to enrich HN-AD bacteria in activated sludge to enhance their contribution remained unknown. This study explored the impact of the feast/famine (F/F) ratio on the succession of autotrophic ammonia oxidizing bacteria (AOB) and HN-AD bacteria in a halophilic aerobic granular sludge (HAGS) system. As the F/F ratio decreased from 1/9 to 1/15, the total inorganic nitrogen (TIN) removal performance significantly decreased. The proportion of heterotrophic bacteria was dropped from 79.0 % to 33 %. Accordingly, the relative abundance of Paracoccus decreased from 70.8 % to 25.4 %, and the copy number of the napA gene was reduced from 2.2 × 1010 copies/g HAGS to 8.1 × 109 copies/g HAGS. It found the F/F ratio regulated the population succession of autotrophic AOB and HN-AD bacteria, thereby providing a solution to achieve the enrichment of HN-AD bacteria in HAGS.
Collapse
Affiliation(s)
- Yuan Sui
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Beijing University of Technology, Beijing 100124, China
| | - You-Wei Cui
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Beijing University of Technology, Beijing 100124, China.
| | - Ji-Lin Huang
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Beijing University of Technology, Beijing 100124, China
| | - Meng-Jiao Xu
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Beijing University of Technology, Beijing 100124, China
| |
Collapse
|
5
|
Seshan H, Santillan E, Constancias F, Chandra Segaran US, Williams RBH, Wuertz S. Metagenomics and metatranscriptomics suggest pathways of 3-chloroaniline degradation in wastewater reactors. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 903:166066. [PMID: 37549699 DOI: 10.1016/j.scitotenv.2023.166066] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2023] [Revised: 07/23/2023] [Accepted: 08/03/2023] [Indexed: 08/09/2023]
Abstract
Biological wastewater treatment systems are often affected by shifts in influent quality, including the input of toxic chemicals. Yet the mechanisms underlying the adaptation of activated sludge process performance are rarely studied in a controlled and replicated experimental setting, particularly when challenged with a sustained toxin input. Three replicate bench-scale bioreactors were subjected to a chemical disturbance in the form of 3-chloroaniline (3-CA) over 132 days, after an acclimation period of 58 days, while three control reactors received no 3-CA input. Ammonia oxidation was initially affected by 3-CA. Within three weeks of the experiment, microbial communities in all three treatment reactors adapted to biologically degrade 3-CA resulting in partial ammonia oxidation recovery. Combining process and microbial community data from amplicon sequencing with potential functions gleaned from assembled metagenomics and metatranscriptomics data, two putative degradation pathways for 3-CA were identified. The first pathway, determined from metagenomics data, involves a benzoate dioxygenase and subsequent meta-cleavage of the aromatic ring. The second, determined from intensive short-term sampling for gene expression data in tandem with 3-CA degradation, involves a phenol monooxygenase followed by ortho-cleavage of the aromatic ring. The relative abundances of amplicon sequence variants associated with the genera Gemmatimonas, OLB8, and Taibaiella correlated significantly with 3-CA degradation. Metagenome-assembled genome data also showed the genus OLB8 to be differentially enriched in treatment reactors, making it a strong candidate as 3-CA degrader. Using replicated reactors, this study has demonstrated the impact of a sustained stress on the activated sludge process. The unique and novel features of this study include the identification of putative pathways and potential degraders of 3-CA using long-term and short-term sampling in tandem with multiple methods in a controlled and replicated experiment.
Collapse
Affiliation(s)
- Hari Seshan
- Singapore Centre for Environmental Life Sciences Engineering, Nanyang Technological University, Singapore 637551, Singapore; Department of Civil and Environmental Engineering, University of California, Davis, CA 95616, USA
| | - Ezequiel Santillan
- Singapore Centre for Environmental Life Sciences Engineering, Nanyang Technological University, Singapore 637551, Singapore; Department of Civil and Environmental Engineering, University of California, Davis, CA 95616, USA
| | - Florentin Constancias
- Singapore Centre for Environmental Life Sciences Engineering, Nanyang Technological University, Singapore 637551, Singapore
| | - Uma Shankari Chandra Segaran
- Singapore Centre for Environmental Life Sciences Engineering, Nanyang Technological University, Singapore 637551, Singapore
| | - Rohan B H Williams
- Singapore Centre for Environmental Life Sciences Engineering, Nanyang Technological University, Singapore 637551, Singapore; Singapore Centre for Environmental Life Sciences Engineering, National University of Singapore, 119077, Singapore
| | - Stefan Wuertz
- Singapore Centre for Environmental Life Sciences Engineering, Nanyang Technological University, Singapore 637551, Singapore; Department of Civil and Environmental Engineering, University of California, Davis, CA 95616, USA; School of Civil and Environmental Engineering, Nanyang Technological University, Singapore 639798, Singapore..
| |
Collapse
|
6
|
Shi S, Yang J, Lin M, Chen Q, Wang B, Zhao J, Rensing C, Liu H, Fan Z, Feng R. Using silkworm excrement to restore vegetation and soil ecology in heavily contaminated mining soils by multiple metal(loid)s: A recyclable sericulture measure. JOURNAL OF HAZARDOUS MATERIALS 2023; 459:132184. [PMID: 37572609 DOI: 10.1016/j.jhazmat.2023.132184] [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: 05/09/2023] [Revised: 07/22/2023] [Accepted: 07/27/2023] [Indexed: 08/14/2023]
Abstract
Ecological restoration of heavily contaminated soils by multiple metal(loid)s in mining areas is very difficult. In this study, we provided an attractive measure of using silkworm excrement (SE) and its modified materials to restore the soil heavily contaminated by arsenic (As), antimony (Sb), cadmium (Cd), lead (Pb) and chromium (Cr). We investigated the adsorption capacities and the associated remediation mechanisms for antimonite [Sb(III)] and antimonate [Sb(V)] by raw SE, biochar-modified SE (BC700), iron-modified BC700 (MBC) and sulfhydryl-modified BC700 (SH). Then, we selected SE and SH to compare their outcomes to restore the vegetations and the soil bacterial communities in the investigated soil mentioned above. The results showed that SE displayed the best characteristics for metal(loid) physical adsorption. But SH conferred the strongest capacity to adsorb Sb (max 23.92 mg g-1), suggesting the process of chemical adsorption played a key role in adsorbing Sb via functional groups (-SH). SE and SH both significantly (1) promoted the growth of pakchoi (Brassica campestris L., New Zealand No.2), community abundance of soil bacteria (283-936 OTUs), and the quantity of bacterial genera correlated with resistance, plant growth promotion and specified carbon metabolism; (2) but reduced bacterial genera correlated with pathogenicity. In this study, we suggested an attractive recyclable measure to restore the disturbed ecological environment in mining areas, i.e, using mulberry to restore the vegetation→ using leaves of mulberry to rear silkworms→ using SE to immobilize metal(loid)s in soils growing mulberry or other plants.
Collapse
Affiliation(s)
- ShengJie Shi
- Institute of Environmental Microbiology, College of Resources and Environment, Fujian Agriculture & Forestry University, Fuzhou 350002, China; Agricultural College, Guangxi University, Nanning, China
| | - JiGang Yang
- Institute of Environmental Microbiology, College of Resources and Environment, Fujian Agriculture & Forestry University, Fuzhou 350002, China
| | - MengTing Lin
- Institute of Environmental Microbiology, College of Resources and Environment, Fujian Agriculture & Forestry University, Fuzhou 350002, China
| | - QiaoYuan Chen
- Institute of Environmental Microbiology, College of Resources and Environment, Fujian Agriculture & Forestry University, Fuzhou 350002, China
| | - Bo Wang
- Institute of Environmental Microbiology, College of Resources and Environment, Fujian Agriculture & Forestry University, Fuzhou 350002, China
| | - JiaYi Zhao
- Institute of Environmental Microbiology, College of Resources and Environment, Fujian Agriculture & Forestry University, Fuzhou 350002, China
| | - Christopher Rensing
- Institute of Environmental Microbiology, College of Resources and Environment, Fujian Agriculture & Forestry University, Fuzhou 350002, China
| | - Hong Liu
- Institute of Environmental Microbiology, College of Resources and Environment, Fujian Agriculture & Forestry University, Fuzhou 350002, China
| | - ZhiLian Fan
- Agricultural College, Guangxi University, Nanning, China
| | - RenWei Feng
- Institute of Environmental Microbiology, College of Resources and Environment, Fujian Agriculture & Forestry University, Fuzhou 350002, China.
| |
Collapse
|
7
|
Huang Q, Feng Y, Han W, Wang J, Sheng H, Zhang Z, Yu Y. Performance, community structure, metabolic pathway, and mechanism in a three-dimensional electrocatalytic biofilter (3DEBF) for the degradation of multiple concentrations of clofibric acid (CA). BIORESOURCE TECHNOLOGY 2023; 381:129138. [PMID: 37169204 DOI: 10.1016/j.biortech.2023.129138] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2023] [Revised: 05/01/2023] [Accepted: 05/04/2023] [Indexed: 05/13/2023]
Abstract
A three-dimensional electrocatalytic biofilter (3DEBF) was constructed to remove clofibric acid (CA). This study compared the effectiveness of 3DEBF and biological aerated filter (BAF) in the removal of refractory CA, examined the effects of influent CA concentrations (0.1, 0.3, 0.5, 0.7, and 1.0 mg/L) on microbial community, and proposed a possible 3DEBF degradation mechanism. Results indicated that the average removal efficiency of 3DEBF reached a peak (76.09%) at 0.7 mg/L, which was 14.43% higher than that of BAF. Based on the microbial community analysis, the significant enrichment of Rhodobacter, Mycobacterium, and Sphingopyxis in 3DEBF was associated with the effect of the CA concentration and the electric field. The degradation pathway indicated that xenobiotics biodegradation and metabolism, membrane transport and replication and repair related genes were upregulated in 3DEBAF. Moreover, CA degradation is based on a combination of adsorption, electrochemical oxidation, and biodegradation.
Collapse
Affiliation(s)
- Qingling Huang
- School of Civil Engineering and Architecture, University of Jinan, Jinan 250022, China
| | - Yan Feng
- School of Civil Engineering and Architecture, University of Jinan, Jinan 250022, China.
| | - Wenwen Han
- China Urban Construction Design & Research Institute Co. Ltd (Shan Dong), Jinan 250022, China
| | - Juanting Wang
- Shandong Linuo Paradigma Co., Ltd, Jinan 250103, China
| | - Huihui Sheng
- School of Civil Engineering and Architecture, University of Jinan, Jinan 250022, China
| | - Zhijie Zhang
- School of Civil Engineering and Architecture, University of Jinan, Jinan 250022, China
| | - YanZhen Yu
- School of Civil Engineering and Architecture, Qilu Institute of Technology, Jinan 250022, China
| |
Collapse
|
8
|
Zhang Y, Zhang Q, Peng H, Zhang W, Li M, Feng J, He J, Su J. The changing C/N of aggressive aniline: Metagenomic analysis of pollutant removal, metabolic pathways and functional genes. CHEMOSPHERE 2022; 309:136598. [PMID: 36174730 DOI: 10.1016/j.chemosphere.2022.136598] [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: 04/16/2022] [Revised: 08/06/2022] [Accepted: 09/21/2022] [Indexed: 06/16/2023]
Abstract
In order to optimize the degradation of high-concentration aniline wastewater, the operation of sequencing batch bioaugmentation reactors with different aniline concentrations (200 mg/L, 600 mg/L, 1000 mg/L) was studied. The results showed that the removal rates of aniline and COD in the three reactors could reach 100%. When the aniline increased to 600 mg/L, the nitrogen removal efficiency reached the peak (51.85%). The increase of aniline inhibited the nitrification, while denitrification was enhanced due to the increase of C/N ratio. But this change was reversed by the toxicity of high concentrations of aniline. The metagenomic analysis showed that when the aniline concentration was 600 mg/L, the abundance distribution of microbial samples was more uniform. The improved of aniline concentration had led to the increase of aromatic compounds degradation metabolic pathways. In addition, the abundance of aniline degradation and nitrogen metabolism genes (dmpB, xylE, norB) was also promoted.
Collapse
Affiliation(s)
- Yunjie Zhang
- School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan, 430070, PR China
| | - Qian Zhang
- School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan, 430070, PR China.
| | - Haojin Peng
- School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan, 430070, PR China
| | - Wenli Zhang
- School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan, 430070, PR China
| | - Meng Li
- School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan, 430070, PR China
| | - Jiapeng Feng
- School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan, 430070, PR China
| | - Jing He
- School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan, 430070, PR China
| | - Junhao Su
- School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan, 430070, PR China
| |
Collapse
|
9
|
Sun H, Xia J, Wu B, Ren H, Zhang X, Ye L. Aerobic starvation treatment of activated sludge enhances the degradation efficiency of refractory organic compounds. WATER RESEARCH 2022; 224:119069. [PMID: 36108399 DOI: 10.1016/j.watres.2022.119069] [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: 05/22/2022] [Revised: 09/04/2022] [Accepted: 09/05/2022] [Indexed: 06/15/2023]
Abstract
Many refractory organic compounds (ROCs) in wastewater are toxic to human and aquatic organisms. Here, we reported an aerobic starvation approach to improve the degradation efficiencies of ROCs in activated sludge systems. The highest degradation rates of bisphenol AF (BPAF) (11.4 mg/g VSS · h) and gabapentin (GBP) (8.9 mg/g VSS · h) were achieved on the second day of the starvation process. While, the degradation rate of bisphenol A (BPA) on the 43rd day reached the maximum value of 0.8 mg/g VSS ·h, which was significantly higher than that of the seeding sludge (0.01 mg/g VSS · h). To investigate the mechanisms of this finding, we applied magnetic-nanoparticle mediated isolation, 16S rRNA gene sequencing, metagenomic sequencing and metatranscriptomic sequencing to analyze the microbial community structures and functions during the starvation process. The results showed that the increase of the BPA degradation ability was caused by the increase of the relative abundance of BPA degrading bacteria (Sphingomonas, Achromobacter, etc.), while, the enhancement of BPAF and GBP degradation was attributed to the increase of the expression of ROC degrading genes. Overall, these results improve our understanding of the microbial ecology of starved activated sludge and provide useful information for the future development of ROC removal technologies.
Collapse
Affiliation(s)
- Haohao Sun
- State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University, Nanjing 210023, China
| | - Juntao Xia
- State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University, Nanjing 210023, China
| | - Bing Wu
- State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University, Nanjing 210023, China
| | - Hongqiang Ren
- State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University, Nanjing 210023, China
| | - Xuxiang Zhang
- State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University, Nanjing 210023, China.
| | - Lin Ye
- State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University, Nanjing 210023, China.
| |
Collapse
|
10
|
Zhang Y, Zheng X, Xu X, Cao L, Zhang H, Zhang H, Li S, Zhang J, Bai N, Lv W, Cao X. Straw return promoted the simultaneous elimination of sulfamethoxazole and related antibiotic resistance genes in the paddy soil. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 806:150525. [PMID: 34582855 DOI: 10.1016/j.scitotenv.2021.150525] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2021] [Revised: 08/31/2021] [Accepted: 09/18/2021] [Indexed: 06/13/2023]
Abstract
Straw return could provide a natural available carbon source for the soil microorganisms, which might affect the environmental behaviours of organic pollutants. In this study, microcosm system was constructed to investigate the effect of rice straw return on the fate of sulfamethoxazole (SMX) and related antibiotic resistance genes (ARGs). The results showed that straw return (1% of soil dry mass) could accelerate the degradation of SMX via co-metabolism. In the treatment group with rice straw, SMX was rapidly decomposed into small molecular compounds (e.g., (Z)-1-amino-3-oxobut-1-en-1-aminium and benzenesulfinic acid) within the first six days, and SMX was undetectable after 60 days; while for the SMX group without rice straw, 1.3 mg kg-1 of SMX still remained at the 60th day. Straw return could enhance the relative abundances of Proteobacteria involved in SMX degradation, including Microvirga and Ramlibacter, which co-metabolized SMX via the degradation pathways of mineralizable components and aromatic compound. Furthermore, straw return significantly eliminated the ARGs. After 60 days, the int1 and sul1 abundances of the treatment group with rice straw were less than one-tenth of the SMX group without rice straw. The redundancy and network analysis of bacterial community and environmental factors showed that dissolved organic carbon and bacteria belonged to Proteobacteria and Actinobacteria might play positive roles in eliminating ARGs. Our results demonstrate that straw return could promote the simultaneous elimination of SMX and corresponding ARGs, which provides a promising approach to effectively treat antibiotics and ARGs in the farmland.
Collapse
Affiliation(s)
- Yue Zhang
- Institute of Eco-Environment and Plant Protection, Shanghai Academy of Agricultural Sciences, Shanghai 201403, China; School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai 200240, China; Shanghai Key Laboratory of Protected Horticultural Technology, Shanghai 201403, China
| | - Xianqing Zheng
- Institute of Eco-Environment and Plant Protection, Shanghai Academy of Agricultural Sciences, Shanghai 201403, China; School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai 200240, China; Shanghai Key Laboratory of Protected Horticultural Technology, Shanghai 201403, China
| | - Xiaoyun Xu
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Linkui Cao
- School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Haiyun Zhang
- Institute of Eco-Environment and Plant Protection, Shanghai Academy of Agricultural Sciences, Shanghai 201403, China; Shanghai Key Laboratory of Protected Horticultural Technology, Shanghai 201403, China
| | - Hanlin Zhang
- Institute of Eco-Environment and Plant Protection, Shanghai Academy of Agricultural Sciences, Shanghai 201403, China; Shanghai Key Laboratory of Protected Horticultural Technology, Shanghai 201403, China
| | - Shuangxi Li
- Institute of Eco-Environment and Plant Protection, Shanghai Academy of Agricultural Sciences, Shanghai 201403, China; Shanghai Key Laboratory of Protected Horticultural Technology, Shanghai 201403, China
| | - Juanqin Zhang
- Institute of Eco-Environment and Plant Protection, Shanghai Academy of Agricultural Sciences, Shanghai 201403, China; Shanghai Key Laboratory of Protected Horticultural Technology, Shanghai 201403, China
| | - Naling Bai
- Institute of Eco-Environment and Plant Protection, Shanghai Academy of Agricultural Sciences, Shanghai 201403, China; Shanghai Key Laboratory of Protected Horticultural Technology, Shanghai 201403, China
| | - Weiguang Lv
- Institute of Eco-Environment and Plant Protection, Shanghai Academy of Agricultural Sciences, Shanghai 201403, China; Shanghai Key Laboratory of Protected Horticultural Technology, Shanghai 201403, China.
| | - Xinde Cao
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
| |
Collapse
|
11
|
Evaluating acute toxicity in enriched nitrifying cultures: Lessons learned. J Microbiol Methods 2021; 192:106377. [PMID: 34798174 DOI: 10.1016/j.mimet.2021.106377] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2021] [Revised: 11/14/2021] [Accepted: 11/14/2021] [Indexed: 11/22/2022]
Abstract
Toxicological batch assays are essential to assess a compound's acute effect on microorganisms. This methodology is frequently employed to evaluate the effect of contaminants in sensitive microbial communities from wastewater treatment plants (WWTPs), such as autotrophic nitrifying populations. However, despite nitrifying batch assays being commonly mentioned in the literature, their experimental design criteria are rarely reported or overlooked. Here, we found that slight deviations in culture preparations and conditions impacted bacterial community performance and could skew assay results. From pre-experimental trials and experience, we determined how mishandling and treatment of cultures could affect nitrification activity. While media and biomass preparations are needed to establish baseline conditions (e.g., biomass washing), we found extensive centrifugation selectively destabilised nitrification activities. Further, it is paramount that the air supply is adjusted to minimise nitrite build-up in the culture and maintain suitable aeration levels without sparging ammonia. DMSO and acetone up to 0.03% (v/v) were suitable organic solvents with minimal impact on nitrification activity. In the nitrification assays with allylthiourea (ATU), dilute cultures exhibited more significant inhibition than concentrated cultures. So there were biomass-related effects; however, these differences minimally impacted the EC50 values. Using different nutrient-media compositions had a minimal effect; however, switching mineral media for the toxicity test from the original cultivation media is not recommended because it reduced the original biomass nitrification capacity. Our results demonstrated that these factors substantially impact the performance of the nitrifying inoculum used in acute bioassays, and consequently, affect the response of AOB-NOB populations during the toxicant exposure. These are not highlighted in operation standards, and unfortunately, they can have significant consequential impacts on the determinations of toxicological endpoints. Moreover, the practical procedures tested here could support other authors in developing testing methodologies, adding quality checks in the experimental framework with minimal waste of time and resources.
Collapse
|
12
|
Liu J, Su J, Zhang M, Luo Z, Li X, Chai B. Bacterial Community Spacing Is Mainly Shaped by Unique Species in the Subalpine Natural Lakes of China. Front Microbiol 2021; 12:669131. [PMID: 34276600 PMCID: PMC8282455 DOI: 10.3389/fmicb.2021.669131] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2021] [Accepted: 05/28/2021] [Indexed: 11/13/2022] Open
Abstract
Bacterial communities have been described as early indicators of both regional and global climatic change and play a critical role in the global biogeochemical cycle. Exploring the mechanisms that determine the diversity patterns of bacterial communities and how they share different habitats along environmental gradients are, therefore, a central theme in microbial ecology research. We characterized the diversity patterns of bacterial communities in Pipahai Lake (PPH), Mayinghai Lake (MYH), and Gonghai Lake (GH), three subalpine natural lakes in Ningwu County, Shanxi, China, and analyzed the distribution of their shared and unique taxa (indicator species). Results showed that the species composition and structure of bacterial communities were significantly different among the three lakes. Both the structure of the entire bacterial community and the unique taxa were significantly influenced by the carbon content (TOC and IC) and space distance; however, the structure of the shared taxa was affected by conductivity (EC), pH, and salinity. The structure of the entire bacterial community and unique taxa were mainly affected by the same factors, suggesting that unique taxa may be important in maintaining the spatial distribution diversity of bacterial communities in subalpine natural freshwater lakes. Our results provide new insights into the diversity maintenance patterns of the bacterial communities in subalpine lakes, and suggest dispersal limitation on bacterial communities between adjacent lakes, even in a small local area. We revealed the importance of unique taxa in maintaining bacterial community structure, and our results are important in understanding how bacterial communities in subalpine lakes respond to environmental change in local habitats.
Collapse
Affiliation(s)
- Jinxian Liu
- Institute of Loess Plateau, Shanxi University, Taiyuan, China.,Shanxi Key Laboratory of Ecological Restoration on the Loess Plateau, Shanxi University, Taiyuan, China.,Field Scientific Observation and Research Station of the Ministry of Education of Shanxi Subalpine Grassland Ecosystem, Shanxi University, Taiyuan, China
| | - Jiahe Su
- Institute of Loess Plateau, Shanxi University, Taiyuan, China.,Shanxi Key Laboratory of Ecological Restoration on the Loess Plateau, Shanxi University, Taiyuan, China.,Field Scientific Observation and Research Station of the Ministry of Education of Shanxi Subalpine Grassland Ecosystem, Shanxi University, Taiyuan, China
| | - Meiting Zhang
- Institute of Loess Plateau, Shanxi University, Taiyuan, China.,Shanxi Key Laboratory of Ecological Restoration on the Loess Plateau, Shanxi University, Taiyuan, China.,Field Scientific Observation and Research Station of the Ministry of Education of Shanxi Subalpine Grassland Ecosystem, Shanxi University, Taiyuan, China
| | - Zhengming Luo
- Institute of Loess Plateau, Shanxi University, Taiyuan, China.,Shanxi Key Laboratory of Ecological Restoration on the Loess Plateau, Shanxi University, Taiyuan, China.,Field Scientific Observation and Research Station of the Ministry of Education of Shanxi Subalpine Grassland Ecosystem, Shanxi University, Taiyuan, China.,Department of Geography, Xinzhou Teachers University, Xinzhou, China
| | - Xiaoqi Li
- Institute of Loess Plateau, Shanxi University, Taiyuan, China.,Shanxi Key Laboratory of Ecological Restoration on the Loess Plateau, Shanxi University, Taiyuan, China.,Field Scientific Observation and Research Station of the Ministry of Education of Shanxi Subalpine Grassland Ecosystem, Shanxi University, Taiyuan, China
| | - Baofeng Chai
- Institute of Loess Plateau, Shanxi University, Taiyuan, China.,Shanxi Key Laboratory of Ecological Restoration on the Loess Plateau, Shanxi University, Taiyuan, China.,Field Scientific Observation and Research Station of the Ministry of Education of Shanxi Subalpine Grassland Ecosystem, Shanxi University, Taiyuan, China
| |
Collapse
|
13
|
Deng F, Dou R, Sun J, Li J, Dang Z. Phenanthrene degradation in soil using biochar hybrid modified bio-microcapsules: Determining the mechanism of action via comparative metagenomic analysis. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 775:145798. [PMID: 33611184 DOI: 10.1016/j.scitotenv.2021.145798] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2020] [Revised: 02/04/2021] [Accepted: 02/07/2021] [Indexed: 06/12/2023]
Abstract
A strategy involving biochar (BC) hybrid modification was developed to promote the bioremediation effect of degrading bacteria immobilized in layer-by-layer assembly (LBL) microcapsules for the treatment of phenanthrene (PHE) polluted soil. A taxonomic and functional metagenomic approach was used to investigate changes in the microbial community structures and functional gene compositions in the PHE-polluted soil during the bioremediation process. Biofortification with an initial PHE concentration of 100 mg kg-1 dry soil in soils using the BC (3%) hybrid LBL bio-microcapsule (BC-LBL, 2.0 g kg-1 dry soil, 107 colony forming unite cell g-1 dry soil) was faster; further, a higher PHE degradation efficiency (80.5% after 25 d) was achieved when compared with that by the LBL agent (66.2% after 25 d) used. Sphingomonas, Streptomyces, Gemmatirosa, Ramlibacter, Flavisolibacter, Phycicoccus, Micromonospora, Acidobacter, Mycobacterium and Gemmatimonas were more abundant in BC-LBL treatment than those in LBL one. Functional gene annotation results showed that more gene number with BC-LBL treatment than those with LBL one. More abundant functions in the former were primarily related to the growth, reproduction, metabolism, and transportation of bacteria. BC hybridization promoting PHE degradation by microencapsulated bacteria may be due to the strong adsorption property of BC, which results in the enrichment of the nutrients that needed for bacterial growth and reproduction, as well as enhancing the mass transfer performance of PHE to BC-LBL; Meanwhile, BC could also stimulate and improve the metabolism and membrane transportation of the degrading bacteria, and finally improving the degradation function.
Collapse
Affiliation(s)
- Fucai Deng
- Guangdong Provincial Key Laboratory of Petrochemical Pollution Process and Control, School of Environmental Science and Engineering, Guangdong University of Petrochemical Technology, Maoming 525000, PR China
| | - Rongni Dou
- Guangdong Provincial Key Laboratory of Petrochemical Pollution Process and Control, School of Environmental Science and Engineering, Guangdong University of Petrochemical Technology, Maoming 525000, PR China
| | - Jianteng Sun
- Guangdong Provincial Key Laboratory of Petrochemical Pollution Process and Control, School of Environmental Science and Engineering, Guangdong University of Petrochemical Technology, Maoming 525000, PR China.
| | - Jinghua Li
- School of Environment, Henan Normal University, Xinxiang, Henan 453007, PR China
| | - Zhi Dang
- College of Environment and Energy, South China University of Technology, Guangzhou, 510006, PR China
| |
Collapse
|
14
|
Jiang Y, Shi X, Ng HY. Aerobic granular sludge systems for treating hypersaline pharmaceutical wastewater: Start-up, long-term performances and metabolic function. JOURNAL OF HAZARDOUS MATERIALS 2021; 412:125229. [PMID: 33951865 DOI: 10.1016/j.jhazmat.2021.125229] [Citation(s) in RCA: 37] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2020] [Revised: 01/22/2021] [Accepted: 01/22/2021] [Indexed: 06/12/2023]
Abstract
The complex organics, residue pharmaceuticals and high salinity in pharmaceutical wastewater pose great challenges to biological wastewater treatment. In this study, granular sludge process was used for treating pharmaceutical wastewater because of its high pollutant removal efficiency. The results suggested that granules could not form within 90-d cultivation when directly fed with target hypersaline pharmaceutical wastewater (RP) due to suppression of EPS secretion by high concentration of inhibitory organics, while granules were successfully developed with hypersaline synthetic wastewater (RS) and diluted pharmaceutical wastewater (RD), respectively. Further comparison of pollutant removal performance from target pharmaceutical wastewater showed that simultaneous removal of organics (effluent bCOD<1 mg L-1) and nitrogen (average TN removal efficiency of 70.3%) could be achieved in RD. Nevertheless, long acclimation period (i.e., 20 d) was needed for granules when carbon source was shifted from simple sodium acetate to complex organic pollutants in pharmaceutical wastewater, with nitrite significantly accumulated in RS. Analysis of microbial community and nitrogen metabolism pathway indicated the higher abundance of nitrite oxidoreductase than that in the RS to alleviate nitrite accumulation in the RD, and functional strains such as Paracoccus and Mycobacterium played critical roles for high efficiency of organic degradation, nitrification and denitrification.
Collapse
Affiliation(s)
- Yu Jiang
- Centre for Water Research, Department of Civil and Environmental Engineering, Faculty of Engineering, National University of Singapore, Singapore
| | - Xueqing Shi
- School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266033, PR China
| | - How Yong Ng
- Centre for Water Research, Department of Civil and Environmental Engineering, Faculty of Engineering, National University of Singapore, Singapore; National University of Singapore Environmental Research Institute, National University of Singapore, Singapore.
| |
Collapse
|
15
|
Trejo-Castillo R, El Kassis EG, Cuervo-López F, Texier AC. Cometabolic biotransformation of benzotriazole in nitrifying batch cultures. CHEMOSPHERE 2021; 270:129461. [PMID: 33412355 DOI: 10.1016/j.chemosphere.2020.129461] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/16/2020] [Revised: 12/05/2020] [Accepted: 12/24/2020] [Indexed: 06/12/2023]
Abstract
Benzotriazole (BT) is a corrosion inhibitor widely distributed in aquatic environments. Little is known about the cometabolic capacity of stabilized nitrifying sludge to biotransform BT. The contribution of the nitrification process in the simultaneous oxidation of ammonium and biotransformation of BT (5 mg/L) was evaluated in 49 d batch cultures inoculated with a sludge produced in steady-state nitrification. The nitrifying sludge could consume BT in the obligate presence of ammonium. A higher cometabolic biotransformation capacity was obtained by increasing the initial ammonium concentration (100-300 mg N/L), reaching 2.3- and 5.8-fold increases for efficiency and specific rate of BT removal. At 300 mg NH4+-N/L, the sludge biotransform 40.8% of BT and 77.6% of ammonium which was completely oxidized into nitrate. In assays with allylthiourea added as specific inhibitor of ammonium monooxygenase (AMO), it was shown that the totality of BT cometabolic biotransformation was associated with the AMO activity. The addition of acetate did not favor heterotrophic biotransformation of BT. BT provoked inhibitory effects on nitrification. This is the first study showing the role of ammonium oxidizing bacteria in the cometabolic biotransformation of BT and their potential use for cometabolism application in treatment of wastewater contaminated with ammonium and BT.
Collapse
Affiliation(s)
- Rubén Trejo-Castillo
- UAM-Iztapalapa, Departamento de Biotecnología, Av. San Rafael Atlixco 186, Col. Vicentina, C.P., 09340, Ciudad de México, Mexico
| | - Elie Girgis El Kassis
- UPAEP, Departamento de Ciencias Biológicas, 11 Poniente 2316, Col. Barrio de Santiago, C.P., 72410, Puebla, Mexico
| | - Flor Cuervo-López
- UAM-Iztapalapa, Departamento de Biotecnología, Av. San Rafael Atlixco 186, Col. Vicentina, C.P., 09340, Ciudad de México, Mexico
| | - Anne-Claire Texier
- UAM-Iztapalapa, Departamento de Biotecnología, Av. San Rafael Atlixco 186, Col. Vicentina, C.P., 09340, Ciudad de México, Mexico.
| |
Collapse
|
16
|
Dou R, Sun J, Lu J, Deng F, Yang C, Lu G, Dang Z. Bacterial communities and functional genes stimulated during phenanthrene degradation in soil by bio-microcapsules. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2021; 212:111970. [PMID: 33517034 DOI: 10.1016/j.ecoenv.2021.111970] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/03/2020] [Revised: 01/12/2021] [Accepted: 01/20/2021] [Indexed: 05/15/2023]
Abstract
In this study, a taxonomic and functional metagenomic method was used to investigate the difference produced between degrading bacteria immobilized in layer-by-layer assembly (LBL) microcapsules or not during the bioremediation of a soil polluted with phenanthrene (PHE). Bioaugmentation with LBL microcapsule immobilized degrading bacteria could result in different changes of native microbial communities, shifting the functional gene constructions of polluted soils. The LBL treatment enhanced PHE degradation (initial concentration of 100 mg kg-1 dry soil) by 60% after 25 d compared to the free bacteria (FB). The enhancing effect of PHE degradation produced by the LBL treatment was found to be significantly associated with some crucial phyla (e.g., Bacteroides, Gemmatimonadetes and Acidobacteria) and genera including Streptomyces, Ramlibacter, Mycobacterium, Phycicoccus, Gemmatirosa, Flavisolibacter, Micromonospora, Acid_Candidatus_Koribacter and Gemmatimonas. The main differences of functional metagenomics between LBL and FB treatments were observed in higher levels in metabolism of aromatic hydrocarbons and its related functions or enzymes in the former, e.g., membrane transport systems, binding, substrate transporter, cleavage enzymes, dehydrogenation, oxidase, esterase and glycosidase, greatly favoring PHE mineralization. Therefore, our results provide useful findings on understanding of how immobilization strategies can influence the taxonomic and functional gene composition in soils, as well as polycyclic aromatic hydrocarbons (PAH) degradation.
Collapse
Affiliation(s)
- Rongni Dou
- Guangdong Provincial Key Laboratory of Petrochemical Pollution Process and Control, School of Environmental Science and Engineering, Guangdong University of Petrochemical Technology, Maoming 525000, PR China
| | - Jianteng Sun
- Guangdong Provincial Key Laboratory of Petrochemical Pollution Process and Control, School of Environmental Science and Engineering, Guangdong University of Petrochemical Technology, Maoming 525000, PR China
| | - Jing Lu
- School of Environment and Safety Engineering, North University of China, Taiyuan 030051, PR China
| | - Fucai Deng
- Guangdong Provincial Key Laboratory of Petrochemical Pollution Process and Control, School of Environmental Science and Engineering, Guangdong University of Petrochemical Technology, Maoming 525000, PR China.
| | - Chen Yang
- School of Environment and Energy, South China University of Technology, Guangzhou 510006, China
| | - Guining Lu
- School of Environment and Energy, South China University of Technology, Guangzhou 510006, China
| | - Zhi Dang
- School of Environment and Energy, South China University of Technology, Guangzhou 510006, China.
| |
Collapse
|
17
|
Wu G, Geng J, Xu K, Ren H. Removal of pharmaceuticals by ammonia oxidizers during nitrification. Appl Microbiol Biotechnol 2021; 105:909-921. [PMID: 33415368 DOI: 10.1007/s00253-020-11032-w] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2020] [Revised: 11/16/2020] [Accepted: 11/23/2020] [Indexed: 01/25/2023]
Abstract
The adverse effect of pharmaceuticals on ecosystem and human health raises great interest for the removal of pharmaceuticals in wastewater treatment plants (WWTPs). Enhanced removal of pharmaceuticals by ammonia oxidizers (AOs) has been observed during nitrification. This review provides a comprehensive summary on the removal of pharmaceuticals by AOs-ammonia oxidizing bacteria (AOB), ammonia oxidizing archaea (AOA), and complete ammonia oxidizer (comammox) during nitrification in pure ammonia oxidizing culture and mixed microbes systems. The superior removal of pharmaceuticals by AOs in conditions with nitrifying activity compared with the conditions without nitrifying activity was proposed. The contribution of AOs on pharmaceuticals removal in pure and mixed microbe systems was discussed and activated sludge modeling was suggested as the proper measure on assessing the contribution of AOs on the removal of pharmaceuticals in mixed microbe culture. Three transformation processes and the involved reaction types of pharmaceuticals transformation during nitrification were reviewed. The present paper provides a systematical summary on pharmaceuticals removal by different AOs across pure and mixed microbes culture during nitrification, which opens up the opportunity to optimize the wastewater biological treatment systems for enhanced removal of pharmaceuticals. KEY POINTS: • The superior removal of pharmaceuticals by ammonia oxidizers (AOs) was summarized. • The removal contribution of pharmaceuticals attributed by AOs was elucidated. • The transformation processes and reaction types of pharmaceuticals were discussed.
Collapse
Affiliation(s)
- Gang Wu
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, Jiangsu, People's Republic of China
| | - Jinju Geng
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, Jiangsu, People's Republic of China.
| | - Ke Xu
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, Jiangsu, People's Republic of China
| | - Hongqiang Ren
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, Jiangsu, People's Republic of China
| |
Collapse
|
18
|
Qiao Z, Hu S, Wu Y, Sun R, Liu X, Chan J. Changes in the fluorescence intensity, degradability, and aromaticity of organic carbon in ammonium and phenanthrene-polluted aquatic ecosystems. RSC Adv 2021; 11:1066-1076. [PMID: 35423689 PMCID: PMC8693519 DOI: 10.1039/d0ra08655j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2020] [Accepted: 11/27/2020] [Indexed: 11/21/2022] Open
Abstract
Mixed cultures were established by a sediment to investigate the changes in organic carbon (C) in a combined ammonium and phenanthrene biotransformation process in aquatic ecosystems. The microorganisms in the sediment demonstrated significant ammonium-N and phenanthrene biotransformation capacity with removal efficiencies of 99.96% and 99.99%, respectively. The changes in the organic C characteristics were evaluated by the fluorescence intensity, degradability (humification index (HIX) and UV absorbance at 254 nm (A254)), aromaticity (specific UV absorbance at 254 nm (SUVA254) and fluorescence index (FI)). Compared with C2 (the second control), the lower values of fluorescence intensity (after the 15th d), HIX (after the 8th d), A254 (after the 11th d), and SUVA254 (after the 8th d) and the higher FI value (after the 8th d) in ammonium and phenanthrene-fed mixed cultures (N_PHE) suggest that aromatic structures and some condensed molecules were easier to break down in N_PHE. Similar results were obtained from Fourier transformation infrared spectroscopy (FTIR) and nuclear magnetic resonance (1H NMR) spectra. Changes in organic C characteristics may be due to two key organisms Massilia and Azohydromonas. The biodiversity also suggested that the selective pressure of ammonium and phenanthrene is the decisive factor for changes in organic C characteristics. This study will shed light on theoretical insights into the interaction of N and aromatic compounds in aquatic ecosystems. Mixed cultures were established by a sediment to investigate the changes in organic carbon (C) in a combined ammonium and phenanthrene biotransformation process in aquatic ecosystems.![]()
Collapse
Affiliation(s)
- Zixia Qiao
- Department of Applied Chemistry
- Northwestern Polytechnical University
- Xi'an 710129
- China
| | - Sihai Hu
- Department of Applied Chemistry
- Northwestern Polytechnical University
- Xi'an 710129
- China
| | - Yaoguo Wu
- Department of Applied Chemistry
- Northwestern Polytechnical University
- Xi'an 710129
- China
| | - Ran Sun
- Department of Applied Chemistry
- Northwestern Polytechnical University
- Xi'an 710129
- China
| | - Xiaoyan Liu
- Department of Applied Chemistry
- Northwestern Polytechnical University
- Xi'an 710129
- China
| | - Jiangwei Chan
- Department of Applied Chemistry
- Northwestern Polytechnical University
- Xi'an 710129
- China
| |
Collapse
|
19
|
Zhang W, Zhang Q, Li M, Wang H, Li Y, Peng H, Feng J. Microbial community and function evaluation in the start-up period of bioaugmented SBR fed with aniline wastewater. BIORESOURCE TECHNOLOGY 2021; 319:124148. [PMID: 32987279 DOI: 10.1016/j.biortech.2020.124148] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/22/2020] [Revised: 09/13/2020] [Accepted: 09/16/2020] [Indexed: 06/11/2023]
Abstract
An enhanced sequencing batch reactor (SBR) system was developed to treat synthetic wastewater rich in 600 mg/L aniline. The aniline degradation efficiency was almost 100%, and the total nitrogen (TN) removal rate was more than 50%. Metagenomics technology revealed the community structure, functional genes and metabolic mechanism during the start-up of the enhanced reactor. Sequencing results showed that Proteobacteria, Bacteroidetes, Chloroflexi and Actinobacteria were dominant phylum. The proportion of degradation of aromatic compounds function increased gradually, but the proportion of nitrogen metabolism function changed little. Functional genes involved in aniline degradation including benA-xylX and dmpB/xylE were detected. The functional genes of nitrogen metabolism were involved in complete nitrification, traditional denitrification, assimilation nitrate reduction and dissimilation nitrate reduction. The functional contribution analysis and network analysis showed that the cooperation and competition of Thauera, Delftia, Diaphorobacter, Micavibrio and Azoarcus ensured the effective removal of aniline and nitrogen.
Collapse
Affiliation(s)
- Wenli Zhang
- School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, PR China
| | - Qian Zhang
- School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, PR China.
| | - Meng Li
- School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, PR China
| | - Hongyu Wang
- School of Civil Engineering, Wuhan University, Wuhan 430072, PR China
| | - Yao Li
- School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, PR China
| | - Haojin Peng
- School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, PR China
| | - Jiapeng Feng
- School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, PR China
| |
Collapse
|
20
|
Boonnorat J, Kanyatrakul A, Prakhongsak A, Ketbubpha K, Phattarapattamawong S, Treesubsuntorn C, Panichnumsin P. Biotoxicity of landfill leachate effluent treated by two-stage acclimatized sludge AS system and antioxidant enzyme activity in Cyprinus carpio. CHEMOSPHERE 2021; 263:128332. [PMID: 33297261 DOI: 10.1016/j.chemosphere.2020.128332] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2020] [Revised: 09/09/2020] [Accepted: 09/11/2020] [Indexed: 06/12/2023]
Abstract
This research comparatively investigates the biotoxicity of landfill leachate effluent from acclimatized and non-acclimatized sludge two-stage activated sludge (AS) systems. Both AS systems were operated with two leachate influent concentrations: moderate (condition 1) and elevated (condition 2). The biotoxicity of AS effluent of variable concentrations (10, 20, and 30% (v/v)) was assessed by the mortality rates of common carp (Cyprinus carpio) and glutathione-S-transferase (GST) enzyme activity. The treatment efficiency of the acclimatized sludge AS system for organic and inorganic compounds and nutrients (BOD, COD, TKN, NH4+, PO43-) were 75-96% under condition 1 and 79-93% under condition 2. The non-acclimatized sludge AS system achieved the treatment efficiency of 70-91% under condition 1 and 66-90% under condition 2. The acclimatized sludge AS system also achieved higher biodegradation of trace organic compounds, especially under condition 1. The effluent from acclimatized sludge AS system was less toxic to the common carp, as evidenced by lower mortality rates and higher GST activity. The findings revealed that the acclimatized sludge two-stage AS system could be deployed to effectively treat landfill leachate with moderate concentrations of compounds and trace organic contaminants. The acclimatized sludge AS is an efficient wastewater treatment solution for developing countries with limited technological and financial resources.
Collapse
Affiliation(s)
- Jarungwit Boonnorat
- Department of Environmental Engineering, Faculty of Engineering, Rajamangala University of Technology Thanyaburi (RMUTT), Klong 6, Pathum Thani, 12110, Thailand.
| | - Alongkorn Kanyatrakul
- Department of Environmental Engineering, Faculty of Engineering, Rajamangala University of Technology Thanyaburi (RMUTT), Klong 6, Pathum Thani, 12110, Thailand
| | - Apichai Prakhongsak
- Department of Environmental Engineering, Faculty of Engineering, Rajamangala University of Technology Thanyaburi (RMUTT), Klong 6, Pathum Thani, 12110, Thailand
| | - Kanjana Ketbubpha
- Department of Environmental Engineering, Faculty of Engineering, Rajamangala University of Technology Thanyaburi (RMUTT), Klong 6, Pathum Thani, 12110, Thailand
| | - Songkeart Phattarapattamawong
- Department of Environmental Engineering, Faculty of Engineering, King Mongkut's University of Technology Thonburi (KMUTT), Thung Khru, Bangkok, 10140, Thailand
| | - Chairat Treesubsuntorn
- Pilot Plant Development and Training Institute, King Mongkut's University of Technology Thonburi (KMUTT), Bangkhuntien, Bangkok, 10150, Thailand
| | - Pornpan Panichnumsin
- Excellent Center of Waste Utilization and Management (EcoWaste), King Mongkut's University of Technology Thonburi (KMUTT), Bangkhuntien, Bangkok, 10150, Thailand; National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency (NSTDA), Pathum Thani, 12120, Thailand
| |
Collapse
|
21
|
Neher DA, Limoges MA, Weicht TR, Sharma M, Millner PD, Donnelly C. Bacterial Community Dynamics Distinguish Poultry Compost from Dairy Compost and Non-Amended Soils Planted with Spinach. Microorganisms 2020; 8:microorganisms8101601. [PMID: 33080970 PMCID: PMC7603165 DOI: 10.3390/microorganisms8101601] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2020] [Revised: 10/13/2020] [Accepted: 10/15/2020] [Indexed: 02/07/2023] Open
Abstract
The aim of this study was to determine whether and how poultry litter compost and dairy manure compost alter the microbial communities within field soils planted with spinach. In three successive years, separate experimental plots on two fields received randomly assigned compost treatments varying in animal origin: dairy manure (DMC), poultry litter (PLC), or neither (NoC). The composition and function of bacterial and fungal communities were characterized by the amplicon sequencing of marker genes and by the ecoenzyme activity, respectively. The temporal autocorrelation within and among years was adjusted by principal response curves (PRC) to analyze the effect of compost on community composition among treatments. Bacteria in the phylum Bacteriodetes, classes Flavobacteriia and Spingobacteriales (Fluviicola, Flavobacteriia, and Pedobacter), were two to four times more abundant in soils amended with PLC than DMC or NoC consistently among fields and years. Fungi in the phylum Ascomycota were relatively abundant, but their composition was field-specific and without treatment differences. The ecoenzyme data verify that the effects of PLC and DMC on soil communities are based on their microbial composition and not a response to the C source or nutrient content of the compost.
Collapse
Affiliation(s)
- Deborah A. Neher
- Department of Plant and Soil Science, University of Vermont, Jeffords Hall, 63 Carrigan Drive, Burlington, VT 05405, USA;
- Correspondence: (D.A.N.); (C.D.); Tel.: +01-802-656-0474 (D.A.N.)
| | - Marie A. Limoges
- Department of Nutrition and Food Sciences, University of Vermont, Marsh Life Science, 109 Carrigan Drive, Burlington, VT 05405, USA;
| | - Thomas R. Weicht
- Department of Plant and Soil Science, University of Vermont, Jeffords Hall, 63 Carrigan Drive, Burlington, VT 05405, USA;
| | - Manan Sharma
- United States Department of Agriculture Research Service, 10300 Baltimore Ave, Beltsville, MD 20705, USA; (M.S.); (P.D.M.)
| | - Patricia D. Millner
- United States Department of Agriculture Research Service, 10300 Baltimore Ave, Beltsville, MD 20705, USA; (M.S.); (P.D.M.)
| | - Catherine Donnelly
- Department of Nutrition and Food Sciences, University of Vermont, Marsh Life Science, 109 Carrigan Drive, Burlington, VT 05405, USA;
- Correspondence: (D.A.N.); (C.D.); Tel.: +01-802-656-0474 (D.A.N.)
| |
Collapse
|
22
|
Lerner H, Öztürk B, Dohrmann AB, Thomas J, Marchal K, De Mot R, Dehaen W, Tebbe CC, Springael D. Culture-Independent Analysis of Linuron-Mineralizing Microbiota and Functions in on-Farm Biopurification Systems via DNA-Stable Isotope Probing: Comparison with Enrichment Culture. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2020; 54:9387-9397. [PMID: 32569463 DOI: 10.1021/acs.est.0c02124] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Our understanding of the microorganisms involved in in situ biodegradation of xenobiotics, like pesticides, in natural and engineered environments is poor. On-farm biopurification systems (BPSs) treat farm-produced pesticide-contaminated wastewater to reduce surface water pollution. BPSs are a labor and cost-efficient technology but are still mainly operated as black box systems. We used DNA-stable isotope probing (DNA-SIP) and classical enrichment to be informed about the organisms responsible for in situ degradation of the phenylurea herbicide linuron in a BPS matrix. DNA-SIP identified Ramlibacter, Variovorax, and an unknown Comamonadaceae genus as the dominant linuron assimilators. While linuron-degrading Variovorax strains have been isolated repeatedly, Ramlibacter has never been associated before with linuron degradation. Genes and mobile genetic elements (MGEs) previously linked to linuron catabolism were enriched in the heavy DNA-SIP fractions, suggesting their involvement in in situ linuron assimilation. BPS material free cultivation of linuron degraders from the same BPS matrix resulted in a community dominated by Variovorax, while Ramlibacter was not observed. Our study provides evidence for the role of Variovorax in in situ linuron biodegradation in a BPS, alongside other organisms like Ramlibacter, and further shows that cultivation results in a biased representation of the in situ linuron-assimilating bacterial populations.
Collapse
Affiliation(s)
- Harry Lerner
- Division of Soil and Water Management, KU Leuven, B-3001 Heverlee-Leuven, Belgium
| | - Başak Öztürk
- Division of Soil and Water Management, KU Leuven, B-3001 Heverlee-Leuven, Belgium
| | - Anja B Dohrmann
- Thünen Institut für Biodiversität, 38116 Braunschweig, Germany
| | - Joice Thomas
- Molecular Design and Synthesis, KU Leuven, B-3001 Heverlee-Leuven, Belgium
| | - Kathleen Marchal
- Department of Plant Biotechnology and Bioinformatics, Ghent University, B-9000 Gent, Belgium
| | - René De Mot
- Centre of Microbial and Plant Genetics, KU Leuven, B-3001 Heverlee-Leuven, Belgium
| | - Wim Dehaen
- Molecular Design and Synthesis, KU Leuven, B-3001 Heverlee-Leuven, Belgium
| | | | - Dirk Springael
- Division of Soil and Water Management, KU Leuven, B-3001 Heverlee-Leuven, Belgium
| |
Collapse
|
23
|
Zhu F, Doyle E, Zhu C, Zhou D, Gu C, Gao J. Metagenomic analysis exploring microbial assemblages and functional genes potentially involved in di (2-ethylhexyl) phthalate degradation in soil. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 715:137037. [PMID: 32041058 DOI: 10.1016/j.scitotenv.2020.137037] [Citation(s) in RCA: 43] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2019] [Revised: 01/23/2020] [Accepted: 01/29/2020] [Indexed: 05/18/2023]
Abstract
Widespread use of di (2-ethylhexyl) phthalate (DEHP) as a plasticizer has caused considerable soil pollution; however, little is known about indigenous microbial communities involved in its degradation in soil. In this study, metagenomic sequencing combined with metabolite determination was used to explore microorganisms and genes potentially involved in DEHP degradation in aerobic and anaerobic soils. The results showed that under both dryland aerobic and flooded anaerobic conditions, DEHP was initially hydrolyzed into mono (2-ethylhexyl) phthalate which was then hydrolyzed into phthalic acid; benzoic acid was the central intermediate during further metabolism steps. Bacteria were more responsive to DEHP presence than fungi/archaea, and potential degradative genes stimulated by DEHP were predominantly associated with bacteria, reflecting the dominant role of bacteria in DEHP degradation. Members of the Actinomycetales seemed to be the dominant degraders under aerobic conditions, while a number of phyla i.e. Gemmatimonadetes, Proteobacteria, Acidobacteria and Bacteroidetes appeared to be involved under anaerobic conditions. Interestingly, ~50% of esterase/lipase/cytochrome P450 genes enriched by DEHP under aerobic conditions were from Nocardioides, a bacterial genus that has not been previously directly linked to phthalate ester degradation. The results indicate that novel degraders may play an important role in DEHP degradation in natural soil environments. This study provides a better understanding of the phthalate ester biodegradation processes occurring in soil.
Collapse
Affiliation(s)
- Fengxiao Zhu
- Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, PR China; School of the Environment, Nanjing University, Nanjing 210003, PR China
| | - Evelyn Doyle
- School of Biology and Environmental Science and Earth Institute, University College Dublin, Belfield, Dublin 4, Ireland
| | - Changyin Zhu
- School of the Environment, Nanjing University, Nanjing 210003, PR China
| | - Dongmei Zhou
- School of the Environment, Nanjing University, Nanjing 210003, PR China
| | - Cheng Gu
- School of the Environment, Nanjing University, Nanjing 210003, PR China
| | - Juan Gao
- Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, PR China.
| |
Collapse
|
24
|
Yu Y, Yin H, Peng H, Lu G, Dang Z. Proteomic mechanism of decabromodiphenyl ether (BDE-209) biodegradation by Microbacterium Y2 and its potential in remediation of BDE-209 contaminated water-sediment system. JOURNAL OF HAZARDOUS MATERIALS 2020; 387:121708. [PMID: 31806441 DOI: 10.1016/j.jhazmat.2019.121708] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2019] [Revised: 11/12/2019] [Accepted: 11/15/2019] [Indexed: 06/10/2023]
Abstract
The investigation of BDE-209 degradation by Microbacterium Y2 under different condition was conducted. Cell membrane permeability, cell surface hydrophobicity (CSH), membrane potential (MP) and reactive oxygen species (ROS) production were altered under BDE-209 stress. Eleven debrominated congeners were identified, suggesting that BDE-209 biodegradation by Microbacterium Y2 was dominantly a successive debromination process. Proteome analysis showed that the overexpression of haloacid dehalogenases, glutathione S-transferases (GSTs) and ATP-binding cassette (ABC) transporters might occupy important roles in BDE-209 biotransformation. Meanwhile, heat shock proteins (HSPs), ribonuclease E, oligoribonuclease (Orn) and ribosomal protein were activated to counter the BDE-209 toxicity. The up-regulated pyruvate dehydrogenase E1 component beta subunit and dihydrolipoamide dehydrogenase suggested that the pyruvate metabolism pathway was activated. Bioaugmentation of BDE-209 polluted water-sediments system with Microbacterium Y2 could efficiently improve BDE-209 removal. The detection of total 16S rRNA genes in treatment system suggested that Microbacterium (25.6 %), Luteimonas (14.3 %), Methylovorus (12.6 %), Hyphomicrobium (9.2 %) were the dominant genera and PICRUSt results further revealed that the diminution of BDE-209 was owed to cooperation between the introduced bacteria and aboriginal ones.
Collapse
Affiliation(s)
- Yuanyuan Yu
- Key Laboratory of Ministry of Education on Pollution Control and Ecosystem Restoration in Industry Clusters, School of Environment and Energy, South China University of Technology, Guangzhou, 510006, Guangdong, China
| | - Hua Yin
- Key Laboratory of Ministry of Education on Pollution Control and Ecosystem Restoration in Industry Clusters, School of Environment and Energy, South China University of Technology, Guangzhou, 510006, Guangdong, China.
| | - Hui Peng
- Department of Chemistry, Jinan University, Guangzhou, 510632, Guangdong, China
| | - Guining Lu
- Key Laboratory of Ministry of Education on Pollution Control and Ecosystem Restoration in Industry Clusters, School of Environment and Energy, South China University of Technology, Guangzhou, 510006, Guangdong, China
| | - Zhi Dang
- Key Laboratory of Ministry of Education on Pollution Control and Ecosystem Restoration in Industry Clusters, School of Environment and Energy, South China University of Technology, Guangzhou, 510006, Guangdong, China
| |
Collapse
|
25
|
Ye L, Mei R, Liu WT, Ren H, Zhang XX. Machine learning-aided analyses of thousands of draft genomes reveal specific features of activated sludge processes. MICROBIOME 2020; 8:16. [PMID: 32046778 PMCID: PMC7014675 DOI: 10.1186/s40168-020-0794-3] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2019] [Accepted: 01/20/2020] [Indexed: 05/19/2023]
Abstract
BACKGROUND Microorganisms in activated sludge (AS) play key roles in the wastewater treatment processes. However, their ecological behaviors and differences from microorganisms in other environments have mainly been studied using the 16S rRNA gene that may not truly represent in situ functions. RESULTS Here, we present 2045 archaeal and bacterial metagenome-assembled genomes (MAGs) recovered from 1.35 Tb of metagenomic data generated from 114 AS samples of 23 full-scale wastewater treatment plants (WWTPs). We found that the AS MAGs have obvious plant-specific features and that few proteins are shared by different WWTPs, especially for WWTPs located in geographically distant areas. Further, we developed a novel machine learning approach that can distinguish between AS MAGs and MAGs from other environments based on the clusters of orthologous groups of proteins with an accuracy of 96%. With the aid of machine learning, we also identified some functional features (e.g., functions related to aerobic metabolism, nutrient sensing/acquisition, and biofilm formation) that are likely vital for AS bacteria to adapt themselves in wastewater treatment bioreactors. CONCLUSIONS Our work reveals that, although the bacterial species in different municipal WWTPs could be different, they may have similar deterministic functional features that allow them to adapt to the AS systems. Also, we provide valuable genome resources and a novel approach for future investigation and better understanding of the microbiome of AS and other ecosystems. Video Abtract.
Collapse
Affiliation(s)
- Lin Ye
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, Jiangsu, China.
| | - Ran Mei
- Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign, Urbana, IL, USA
| | - Wen-Tso Liu
- Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign, Urbana, IL, USA
| | - Hongqiang Ren
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, Jiangsu, China
| | - Xu-Xiang Zhang
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, Jiangsu, China.
| |
Collapse
|
26
|
How Genomics Is Changing What We Know About the Evolution and Genome of Bordetella pertussis. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2019; 1183:1-17. [PMID: 31321755 DOI: 10.1007/5584_2019_401] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The evolution of Bordetella pertussis from a common ancestor similar to Bordetella bronchiseptica has occurred through large-scale gene loss, inactivation and rearrangements, largely driven by the spread of insertion sequence element repeats throughout the genome. B. pertussis is widely considered to be monomorphic, and recent evolution of the B. pertussis genome appears to, at least in part, be driven by vaccine-based selection. Given the recent global resurgence of whooping cough despite the wide-spread use of vaccination, a more thorough understanding of B. pertussis genomics could be highly informative. In this chapter we discuss the evolution of B. pertussis, including how vaccination is changing the circulating B. pertussis population at the gene-level, and how new sequencing technologies are revealing previously unknown levels of inter- and intra-strain variation at the genome-level.
Collapse
|