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Hu ZY, Lin YP, Wang QT, Zhang YX, Tang J, Hong SD, Dai K, Wang S, Lu YZ, van Loosdrecht MCM, Wu J, Zeng RJ, Zhang F. Identification and degradation of structural extracellular polymeric substances in waste activated sludge via a polygalacturonate-degrading consortium. WATER RESEARCH 2023; 233:119800. [PMID: 36868117 DOI: 10.1016/j.watres.2023.119800] [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: 12/05/2022] [Revised: 02/22/2023] [Accepted: 02/22/2023] [Indexed: 06/18/2023]
Abstract
By maintaining the cell integrity of waste activated sludge (WAS), structural extracellular polymeric substances (St-EPS) resist WAS anaerobic fermentation. This study investigates the occurrence of polygalacturonate in WAS St-EPS by combining chemical and metagenomic analyses that identify ∼22% of the bacteria, including Ferruginibacter and Zoogloea, that are associated with polygalacturonate production using the key enzyme EC 5.1.3.6. A highly active polygalacturonate-degrading consortium (GDC) was enriched and the potential of this GDC for degrading St-EPS and promoting methane production from WAS was investigated. The percentage of St-EPS degradation increased from 47.6% to 85.2% after inoculation with the GDC. Methane production was also increased by up to 2.3 times over a control group, with WAS destruction increasing from 11.5% to 28.4%. Zeta potential and rheological behavior confirmed the positive effect which GDC has on WAS fermentation. The major genus in the GDC was identified as Clostridium (17.1%). Extracellular pectate lyases (EC 4.2.2.2 and 4.2.2.9), excluding polygalacturonase (EC 3.2.1.15), were observed in the metagenome of the GDC and most likely play a core role in St-EPS hydrolysis. Dosing with GDC provides a good biological method for St-EPS degradation and thereby enhances the conversion of WAS to methane.
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Affiliation(s)
- Zhi-Yi Hu
- Engineering Research Center of Soil Remediation of Fujian Province University, College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Yi-Peng Lin
- Engineering Research Center of Soil Remediation of Fujian Province University, College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Qing-Ting Wang
- Engineering Research Center of Soil Remediation of Fujian Province University, College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Yi-Xin Zhang
- Engineering Research Center of Soil Remediation of Fujian Province University, College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Jie Tang
- Engineering Research Center of Soil Remediation of Fujian Province University, College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Si-Di Hong
- Engineering Research Center of Soil Remediation of Fujian Province University, College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Kun Dai
- Engineering Research Center of Soil Remediation of Fujian Province University, College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Shuai Wang
- Engineering Research Center of Soil Remediation of Fujian Province University, College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Yong-Ze Lu
- School of Energy and Environment, Southeast University, Nanjing 210096, China
| | - Mark C M van Loosdrecht
- Department of Biotechnology, Delft University of Technology, Julianalaan 67, 2628 BC Delft, the Netherlands
| | - Jianrong Wu
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, China
| | - Raymond Jianxiong Zeng
- Engineering Research Center of Soil Remediation of Fujian Province University, College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
| | - Fang Zhang
- Engineering Research Center of Soil Remediation of Fujian Province University, College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
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Falzarano M, Polettini A, Pomi R, Rossi A, Zonfa T. Anaerobic Biodegradability of Commercial Bioplastic Products: Systematic Bibliographic Analysis and Critical Assessment of the Latest Advances. MATERIALS (BASEL, SWITZERLAND) 2023; 16:2216. [PMID: 36984096 PMCID: PMC10058929 DOI: 10.3390/ma16062216] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/03/2023] [Revised: 02/28/2023] [Accepted: 03/07/2023] [Indexed: 06/18/2023]
Abstract
Bioplastics have entered everyday life as a potential sustainable substitute for commodity plastics. However, still further progress should be made to clarify their degradation behavior under controlled and uncontrolled conditions. The wide array of biopolymers and commercial blends available make predicting the biodegradation degree and kinetics quite a complex issue that requires specific knowledge of the multiple factors affecting the degradation process. This paper summarizes the main scientific literature on anaerobic digestion of biodegradable plastics through a general bibliographic analysis and a more detailed discussion of specific results from relevant experimental studies. The critical analysis of literature data initially included 275 scientific references, which were then screened for duplication/pertinence/relevance. The screened references were analyzed to derive some general features of the research profile, trends, and evolution in the field of anaerobic biodegradation of bioplastics. The second stage of the analysis involved extracting detailed results about bioplastic degradability under anaerobic conditions by screening analytical and performance data on biodegradation performance for different types of bioplastic products and different anaerobic biodegradation conditions, with a particular emphasis on the most recent data. A critical overview of existing biopolymers is presented, along with their properties and degradation mechanisms and the operating parameters influencing/enhancing the degradation process under anaerobic conditions.
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Pessi BA, Baroukh C, Bacquet A, Bernard O. A universal dynamical metabolic model representing mixotrophic growth of Chlorella sp. on wastes. WATER RESEARCH 2023; 229:119388. [PMID: 36462256 DOI: 10.1016/j.watres.2022.119388] [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: 08/03/2022] [Revised: 11/02/2022] [Accepted: 11/18/2022] [Indexed: 06/17/2023]
Abstract
An emerging idea is to couple wastewater treatment and biofuel production using microalgae to achieve higher productivities and lower costs. This paper proposes a metabolic modeling of Chlorella sp. growing on fermentation wastes (blend of acetate, butyrate and other acids) in mixotrophic conditions, accounting also for the possible inhibitory substrates. This model extends previous works by modifying the metabolic network to include the consumption of glycerol and glucose by Chlorella sp., with the goal to test the addition of these substrates in order to overcome butyrate inhibition. The metabolic model was built using the DRUM framework and consists of 188 reactions and 173 metabolites. After a calibration phase, the model was successfully challenged with data from 122 experiments collected from scientific literature in autotrophic, heterotrophic and mixotrophic conditions. The optimal feeding strategy estimated with the model reduces the time to consume the volatile fatty acids from 16 days to 2 days. The high prediction capability of this model opens new routes for enhancing design and operation in waste valorization using microalgae.
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Affiliation(s)
| | - Caroline Baroukh
- LIPME, Université de Toulouse, INRAE, CNRS, Castanet Tolosan, France
| | - Anais Bacquet
- LOV, UMR 7093, Sorbonne university, CNRS, Villefranche-sur-mer, France
| | - Olivier Bernard
- Biocore, INRIA, Université Côte d'Azur, Sophia Antipolis, France; LOV, UMR 7093, Sorbonne university, CNRS, Villefranche-sur-mer, France
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4
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Capson-Tojo G, Batstone DJ, Hülsen T. Expanding mechanistic models to represent purple phototrophic bacteria enriched cultures growing outdoors. WATER RESEARCH 2023; 229:119401. [PMID: 36450178 DOI: 10.1016/j.watres.2022.119401] [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: 06/14/2022] [Revised: 10/17/2022] [Accepted: 11/20/2022] [Indexed: 06/17/2023]
Abstract
The economic feasibility of purple phototrophic bacteria (PPB) for resource recovery relies on using enriched-mixed cultures and sunlight. This work presents an extended Photo-Anaerobic Model (ePAnM), considering: (i) the diverse metabolic capabilities of PPB, (ii) microbial clades interacting with PPB, and (iii) varying environmental conditions. Key kinetic and stoichiometric parameters were either determined experimentally (with dedicated tests), calculated, or gathered from literature. The model was calibrated and validated using different datasets from an outdoors demonstration-scale reactor, as well as results from aerobic and anaerobic batch tests. The ePAnM was able to predict the concentrations of key compounds/components (e.g., COD, volatile fatty acids, and nutrients), as well as microbial communities (with anaerobic systems dominated by fermenters and PPB). The results underlined the importance of considering other microbial clades and varying environmental conditions. The model predicted a minimum hydraulic retention time of 0.5 d-1. A maximum width of 10 cm in flat plate reactors should not be exceeded. Simulations showed the potential of a combined day-anaerobic/night-aerobic operational strategy to allow efficient continuous operation.
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Affiliation(s)
- Gabriel Capson-Tojo
- Australian Centre for Water and Environmental Biotechnology, The University of Queensland, Brisbane, QLD 4072, Australia; Department of Chemical Engineering, CRETUS, Universidade de Santiago de Compostela, Santiago de Compostela, Galicia 15782, Spain; INRAE, University Montpellier, LBE, 102 Avenue des Etangs, Narbonne 11100, France.
| | - Damien J Batstone
- Australian Centre for Water and Environmental Biotechnology, The University of Queensland, Brisbane, QLD 4072, Australia
| | - Tim Hülsen
- Australian Centre for Water and Environmental Biotechnology, The University of Queensland, Brisbane, QLD 4072, Australia
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5
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Krohn C, Khudur L, Dias DA, van den Akker B, Rees CA, Crosbie ND, Surapaneni A, O'Carroll DM, Stuetz RM, Batstone DJ, Ball AS. The role of microbial ecology in improving the performance of anaerobic digestion of sewage sludge. Front Microbiol 2022; 13:1079136. [PMID: 36590430 PMCID: PMC9801413 DOI: 10.3389/fmicb.2022.1079136] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2022] [Accepted: 11/28/2022] [Indexed: 12/15/2022] Open
Abstract
The use of next-generation diagnostic tools to optimise the anaerobic digestion of municipal sewage sludge has the potential to increase renewable natural gas recovery, improve the reuse of biosolid fertilisers and help operators expand circular economies globally. This review aims to provide perspectives on the role of microbial ecology in improving digester performance in wastewater treatment plants, highlighting that a systems biology approach is fundamental for monitoring mesophilic anaerobic sewage sludge in continuously stirred reactor tanks. We further highlight the potential applications arising from investigations into sludge ecology. The principal limitation for improvements in methane recoveries or in process stability of anaerobic digestion, especially after pre-treatment or during co-digestion, are ecological knowledge gaps related to the front-end metabolism (hydrolysis and fermentation). Operational problems such as stable biological foaming are a key problem, for which ecological markers are a suitable approach. However, no biomarkers exist yet to assist in monitoring and management of clade-specific foaming potentials along with other risks, such as pollutants and pathogens. Fundamental ecological principles apply to anaerobic digestion, which presents opportunities to predict and manipulate reactor functions. The path ahead for mapping ecological markers on process endpoints and risk factors of anaerobic digestion will involve numerical ecology, an expanding field that employs metrics derived from alpha, beta, phylogenetic, taxonomic, and functional diversity, as well as from phenotypes or life strategies derived from genetic potentials. In contrast to addressing operational issues (as noted above), which are effectively addressed by whole population or individual biomarkers, broad improvement and optimisation of function will require enhancement of hydrolysis and acidogenic processes. This will require a discovery-based approach, which will involve integrative research involving the proteome and metabolome. This will utilise, but overcome current limitations of DNA-centric approaches, and likely have broad application outside the specific field of anaerobic digestion.
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Affiliation(s)
- Christian Krohn
- ARC Training Centre for the Transformation of Australia's Biosolids Resource, RMIT University, Bundoora, VIC, Australia,*Correspondence: Christian Krohn,
| | - Leadin Khudur
- ARC Training Centre for the Transformation of Australia's Biosolids Resource, RMIT University, Bundoora, VIC, Australia
| | - Daniel Anthony Dias
- School of Health and Biomedical Sciences, Discipline of Laboratory Medicine, STEM College, RMIT University, Bundoora, VIC, Australia
| | | | | | | | - Aravind Surapaneni
- ARC Training Centre for the Transformation of Australia's Biosolids Resource, RMIT University, Bundoora, VIC, Australia
| | - Denis M. O'Carroll
- Water Research Centre, School of Civil and Environmental Engineering, University of New South Wales, Sydney, NSW, Australia
| | - Richard M. Stuetz
- Water Research Centre, School of Civil and Environmental Engineering, University of New South Wales, Sydney, NSW, Australia
| | - Damien J. Batstone
- ARC Training Centre for the Transformation of Australia's Biosolids Resource, RMIT University, Bundoora, VIC, Australia,Australian Centre for Water and Environmental Biotechnology, Gehrmann Building, The University of Queensland, Brisbane, QLD, Australia
| | - Andrew S. Ball
- ARC Training Centre for the Transformation of Australia's Biosolids Resource, RMIT University, Bundoora, VIC, Australia
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Shen J, Jin W, Chen C. Metabolic minimap of anaerobic digestion for undergraduate biochemistry courses. BIOCHEMISTRY AND MOLECULAR BIOLOGY EDUCATION : A BIMONTHLY PUBLICATION OF THE INTERNATIONAL UNION OF BIOCHEMISTRY AND MOLECULAR BIOLOGY 2022; 50:641-648. [PMID: 36111804 DOI: 10.1002/bmb.21671] [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: 07/18/2021] [Revised: 07/02/2022] [Accepted: 07/25/2022] [Indexed: 06/15/2023]
Abstract
As a representative catabolic reaction that widely exists in nature, anaerobic digestion (AD) exhibits great value regarding the global carbon cycle, renewable energy development, and environmental protection. Such an important biochemical reaction was ignored before and should be introduced into the teaching and textbooks of undergraduate biochemistry courses. However, students may face obstructions when learning AD theories since the metabolic pathways in AD are very complex. To solve these problems, an instructive metabolic minimap of the AD reaction was designed, including its reaction stages, reaction pathways, substrates, and enzymes. Furthermore, the interrelationships between aerobic catabolism (AEC) and anaerobic catabolism (ANC) were also summarized by combining the catabolic pathways of typical biological macromolecules. In this paper, AD theories were first replenished into undergraduate biochemistry courses by metabolic minimap, which not only provided valuable supports for the practical teaching of AD in undergraduate biochemistry courses, but also acted as an important reference for students in biology-related majors and biochemistry teachers.
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Affiliation(s)
- Jian Shen
- College of Chemical Engineering, Beijing University of Chemical Technology, Beijing, China
| | - Wenxiong Jin
- College of Chemical Engineering, Beijing University of Chemical Technology, Beijing, China
| | - Chang Chen
- College of Chemical Engineering, Beijing University of Chemical Technology, Beijing, China
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7
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Trego AC, Conall Holohan B, Keating C, Graham A, O'Connor S, Gerardo M, Hughes D, Ijaz UZ, O'Flaherty V. First proof of concept for full-scale, direct, low-temperature anaerobic treatment of municipal wastewater. BIORESOURCE TECHNOLOGY 2021; 341:125786. [PMID: 34523560 DOI: 10.1016/j.biortech.2021.125786] [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: 06/24/2021] [Revised: 08/09/2021] [Accepted: 08/12/2021] [Indexed: 06/13/2023]
Abstract
Municipal wastewater constitutes the largest fraction of wastewater, and yet treatment processes are largely removal-based. High-rate anaerobic digestion (AD) has revolutionised the sustainability of industrial wastewater treatment and could additionally provide an alternative for municipal wastewater. While AD of dilute municipal wastewater is common in tropical regions, the low temperatures of temperate climates has resulted in slow uptake. Here, we demonstrate for the first time, direct, high-rate, low-temperature AD of low-strength municipal wastewater at full-scale. An 88 m3 hybrid reactor was installed at the municipal wastewater treatment plant in Builth Wells, UK and operated for 290 days. Ambient temperatures ranged from 2 to 18 °C, but remained below 15 °C for > 100 days. Influent BOD fluctuated between 2 and 200 mg L-1. However, BOD removal often reached > 85%. 16S rRNA amplicon sequencing of DNA from the biomass revealed a highly adaptable core microbiome. These findings could provide the basis for the next-generation of municipal wastewater treatment.
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Affiliation(s)
- Anna Christine Trego
- Microbial Ecology Laboratory, Microbiology, School of Natural Sciences, National University of Ireland, University Road, Galway H91 TK33, Ireland
| | - B Conall Holohan
- Microbial Ecology Laboratory, Microbiology, School of Natural Sciences, National University of Ireland, University Road, Galway H91 TK33, Ireland; NVP Energy Ltd., IDA Technology Park, Mervue, Galway, Ireland
| | - Ciara Keating
- Water Engineering Group, School of Engineering, The University of Glasgow, Oakfield Avenue, Glasgow G12 8LT, United Kingdom
| | - Alison Graham
- Microbial Ecology Laboratory, Microbiology, School of Natural Sciences, National University of Ireland, University Road, Galway H91 TK33, Ireland
| | - Sandra O'Connor
- Microbial Ecology Laboratory, Microbiology, School of Natural Sciences, National University of Ireland, University Road, Galway H91 TK33, Ireland
| | - Michael Gerardo
- Dwr Cymru Welsh Water, Gowerton WwTW, Victoria Road, Gowerton, Swansea SA4 3AB, United Kingdom
| | - Dermot Hughes
- NVP Energy Ltd., IDA Technology Park, Mervue, Galway, Ireland
| | - Umer Zeeshan Ijaz
- Water Engineering Group, School of Engineering, The University of Glasgow, Oakfield Avenue, Glasgow G12 8LT, United Kingdom.
| | - Vincent O'Flaherty
- Microbial Ecology Laboratory, Microbiology, School of Natural Sciences, National University of Ireland, University Road, Galway H91 TK33, Ireland
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8
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Dalby FR, Hafner SD, Petersen SO, VanderZaag AC, Habtewold J, Dunfield K, Chantigny MH, Sommer SG. Understanding methane emission from stored animal manure: A review to guide model development. JOURNAL OF ENVIRONMENTAL QUALITY 2021; 50:817-835. [PMID: 34021608 DOI: 10.1002/jeq2.20252] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2020] [Accepted: 05/14/2021] [Indexed: 06/12/2023]
Abstract
National inventories of methane (CH4 ) emission from manure management are based on guidelines from the Intergovernmental Panel on Climate Change using country-specific emission factors. These calculations must be simple and, consequently, the effects of management practices and environmental conditions are only crudely represented in the calculations. The intention of this review is to develop a detailed understanding necessary for developing accurate models for calculating CH4 emission from liquid manure, with particular focus on the microbiological conversion of organic matter to CH4 . Themes discussed are (a) the liquid manure environment; (b) methane production processes from a modeling perspective; (c) development and adaptation of methanogenic communities; (d) mass and electron conservation; (e) steps limiting CH4 production; (f) inhibition of methanogens; (g) temperature effects on CH4 production; and (h) limits of existing estimation approaches. We conclude that a model must include calculation of microbial response to variations in manure temperature, substrate availability and age, and management system, because these variables substantially affect CH4 production. Methane production can be reduced by manipulating key variables through management procedures, and the effects may be taken into account by including a microbial component in the model. When developing new calculation procedures, it is important to include reasonably accurate algorithms of microbial adaptation. This review presents concepts for these calculations and ideas for how these may be carried out. A need for better quantification of hydrolysis kinetics is identified, and the importance of short- and long-term microbial adaptation is highlighted.
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Affiliation(s)
- Frederik R Dalby
- Dep. of Biological and Chemical Engineering, Aarhus Univ., Aarhus, 8200, Denmark
| | - Sasha D Hafner
- Dep. of Biological and Chemical Engineering, Aarhus Univ., Aarhus, 8200, Denmark
- Hafner Consulting LLC, Reston, VA, 20191, USA
| | | | - Andrew C VanderZaag
- Ottawa Research and Development Ctr., Agriculture and Agri-Food Canada, Ottawa, ON, K1A 0C6, Canada
| | - Jemaneh Habtewold
- Ottawa Research and Development Ctr., Agriculture and Agri-Food Canada, Ottawa, ON, K1A 0C6, Canada
| | - Kari Dunfield
- School of Environmental Science, Univ. of Guelph, Guelph, ON, N1G 2W1, Canada
| | - Martin H Chantigny
- Quebec Research and Development Ctr., Agriculture and Agri-Food Canada, Quebec, QC, G1V 2J3, Canada
| | - Sven G Sommer
- Dep. of Biological and Chemical Engineering, Aarhus Univ., Aarhus, 8200, Denmark
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9
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Hashemi S, Hashemi SE, Lien KM, Lamb JJ. Molecular Microbial Community Analysis as an Analysis Tool for Optimal Biogas Production. Microorganisms 2021; 9:microorganisms9061162. [PMID: 34071282 PMCID: PMC8226781 DOI: 10.3390/microorganisms9061162] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2021] [Revised: 05/17/2021] [Accepted: 05/26/2021] [Indexed: 11/16/2022] Open
Abstract
The microbial diversity in anaerobic digestion (AD) is important because it affects process robustness. High-throughput sequencing offers high-resolution data regarding the microbial diversity and robustness of biological systems including AD; however, to understand the dynamics of microbial processes, knowing the microbial diversity is not adequate alone. Advanced meta-omic techniques have been established to determine the activity and interactions among organisms in biological processes like AD. Results of these methods can be used to identify biomarkers for AD states. This can aid a better understanding of system dynamics and be applied to producing comprehensive models for AD. The paper provides valuable knowledge regarding the possibility of integration of molecular methods in AD. Although meta-genomic methods are not suitable for on-line use due to long operating time and high costs, they provide extensive insight into the microbial phylogeny in AD. Meta-proteomics can also be explored in the demonstration projects for failure prediction. However, for these methods to be fully realised in AD, a biomarker database needs to be developed.
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Affiliation(s)
- Seyedbehnam Hashemi
- Department of Energy and Process Engineering & Enersense, Norwegian University of Science and Technology (NTNU), 7034 Trondheim, Norway; (S.H.); (S.E.H.); (K.M.L.)
| | - Sayed Ebrahim Hashemi
- Department of Energy and Process Engineering & Enersense, Norwegian University of Science and Technology (NTNU), 7034 Trondheim, Norway; (S.H.); (S.E.H.); (K.M.L.)
| | - Kristian M. Lien
- Department of Energy and Process Engineering & Enersense, Norwegian University of Science and Technology (NTNU), 7034 Trondheim, Norway; (S.H.); (S.E.H.); (K.M.L.)
| | - Jacob J. Lamb
- Department of Energy and Process Engineering & Enersense, Norwegian University of Science and Technology (NTNU), 7034 Trondheim, Norway; (S.H.); (S.E.H.); (K.M.L.)
- Department of Electronic Systems, Norwegian University of Science and Technology (NTNU), 7034 Trondheim, Norway
- Correspondence:
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10
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Fradinho J, Allegue LD, Ventura M, Melero JA, Reis MAM, Puyol D. Up-scale challenges on biopolymer production from waste streams by Purple Phototrophic Bacteria mixed cultures: A critical review. BIORESOURCE TECHNOLOGY 2021; 327:124820. [PMID: 33578354 DOI: 10.1016/j.biortech.2021.124820] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/27/2020] [Revised: 01/29/2021] [Accepted: 01/30/2021] [Indexed: 06/12/2023]
Abstract
The increasing volume of waste streams require new biological technologies that can address pollution concerns while offering sustainable products. Purple phototrophic bacteria (PPB) are very versatile organisms that present a unique metabolism that allows them to adapt to a variety of environments, including the most complex waste streams. Their successful adaptation to such demanding conditions is partly the result of internal polymers accumulation which can be stored for electron/energy balance or as carbon and nutrients reserves for deprivation periods. Polyhydroxyalkanoates, glycogen, sulphur and polyphosphate are examples of polymers produced by PPB that can be economically explored due to their applications in the plastic, energy and fertilizers sectors. Their large-scale production implies the outdoor operation of PPB systems which brings new challenges, identified in this review. An overview of the current PPB polymer producing technologies and prospects for their future development is also provided.
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Affiliation(s)
- J Fradinho
- UCIBIO-REQUIMTE, Department of Chemistry, Faculty of Sciences and Technology, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal
| | - L D Allegue
- Group of Chemical and Environmental Engineering (GIQA), Higher School of Experimental Sciences and Technology (ESCET), Universidad Rey Juan Carlos, 28933 Móstoles, Madrid, Spain
| | - M Ventura
- Group of Chemical and Environmental Engineering (GIQA), Higher School of Experimental Sciences and Technology (ESCET), Universidad Rey Juan Carlos, 28933 Móstoles, Madrid, Spain
| | - J A Melero
- Group of Chemical and Environmental Engineering (GIQA), Higher School of Experimental Sciences and Technology (ESCET), Universidad Rey Juan Carlos, 28933 Móstoles, Madrid, Spain
| | - M A M Reis
- UCIBIO-REQUIMTE, Department of Chemistry, Faculty of Sciences and Technology, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal
| | - D Puyol
- Group of Chemical and Environmental Engineering (GIQA), Higher School of Experimental Sciences and Technology (ESCET), Universidad Rey Juan Carlos, 28933 Móstoles, Madrid, Spain.
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11
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Trego AC, Galvin E, Sweeney C, Dunning S, Murphy C, Mills S, Nzeteu C, Quince C, Connelly S, Ijaz UZ, Collins G. Growth and Break-Up of Methanogenic Granules Suggests Mechanisms for Biofilm and Community Development. Front Microbiol 2020; 11:1126. [PMID: 32582085 PMCID: PMC7285868 DOI: 10.3389/fmicb.2020.01126] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2020] [Accepted: 05/05/2020] [Indexed: 12/14/2022] Open
Abstract
Methanogenic sludge granules are densely packed, small, spherical biofilms found in anaerobic digesters used to treat industrial wastewaters, where they underpin efficient organic waste conversion and biogas production. Each granule theoretically houses representative microorganisms from all of the trophic groups implicated in the successive and interdependent reactions of the anaerobic digestion (AD) process. Information on exactly how methanogenic granules develop, and their eventual fate will be important for precision management of environmental biotechnologies. Granules from a full-scale bioreactor were size-separated into small (0.6-1 mm), medium (1-1.4 mm), and large (1.4-1.8 mm) size fractions. Twelve laboratory-scale bioreactors were operated using either small, medium, or large granules, or unfractionated sludge. After >50 days of operation, the granule size distribution in each of the small, medium, and large bioreactor sets had diversified beyond-to both bigger and smaller than-the size fraction used for inoculation. Interestingly, extra-small (XS; <0.6 mm) granules were observed, and retained in all of the bioreactors, suggesting the continuous nature of granulation, and/or the breakage of larger granules into XS bits. Moreover, evidence suggested that even granules with small diameters could break. "New" granules from each emerging size were analyzed by studying community structure based on high-throughput 16S rRNA gene sequencing. Methanobacterium, Aminobacterium, Propionibacteriaceae, and Desulfovibrio represented the majority of the community in new granules. H2-using, and not acetoclastic, methanogens appeared more important, and were associated with abundant syntrophic bacteria. Multivariate integration (MINT) analyses identified distinct discriminant taxa responsible for shaping the microbial communities in different-sized granules.
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Affiliation(s)
- Anna Christine Trego
- Microbial Communities Laboratory, School of Natural Sciences, National University of Ireland Galway, Galway, Ireland
- Microbial Ecology Laboratory, School of Natural Sciences, National University of Ireland Galway, Galway, Ireland
| | - Evan Galvin
- Microbial Communities Laboratory, School of Natural Sciences, National University of Ireland Galway, Galway, Ireland
| | - Conor Sweeney
- Microbial Communities Laboratory, School of Natural Sciences, National University of Ireland Galway, Galway, Ireland
| | - Sinéad Dunning
- Microbial Communities Laboratory, School of Natural Sciences, National University of Ireland Galway, Galway, Ireland
| | - Cillian Murphy
- Microbial Communities Laboratory, School of Natural Sciences, National University of Ireland Galway, Galway, Ireland
| | - Simon Mills
- Microbial Communities Laboratory, School of Natural Sciences, National University of Ireland Galway, Galway, Ireland
| | - Corine Nzeteu
- Microbial Ecology Laboratory, School of Natural Sciences, National University of Ireland Galway, Galway, Ireland
| | | | - Stephanie Connelly
- Infrastructure and Environment, School of Engineering, University of Glasgow, Glasgow, United Kingdom
| | - Umer Zeeshan Ijaz
- Infrastructure and Environment, School of Engineering, University of Glasgow, Glasgow, United Kingdom
| | - Gavin Collins
- Microbial Communities Laboratory, School of Natural Sciences, National University of Ireland Galway, Galway, Ireland
- Infrastructure and Environment, School of Engineering, University of Glasgow, Glasgow, United Kingdom
- Ryan Institute, National University of Ireland Galway, Galway, Ireland
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Lillington SP, Leggieri PA, Heom KA, O'Malley MA. Nature's recyclers: anaerobic microbial communities drive crude biomass deconstruction. Curr Opin Biotechnol 2019; 62:38-47. [PMID: 31593910 DOI: 10.1016/j.copbio.2019.08.015] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2019] [Revised: 08/25/2019] [Accepted: 08/29/2019] [Indexed: 12/13/2022]
Abstract
Microbial communities within anaerobic ecosystems have evolved to degrade and recycle carbon throughout the earth. A number of strains have been isolated from anaerobic microbial communities, which are rich in carbohydrate active enzymes (CAZymes) to liberate fermentable sugars from crude plant biomass (lignocellulose). However, natural anaerobic communities host a wealth of microbial diversity that has yet to be harnessed for biotechnological applications to hydrolyze crude biomass into sugars and value-added products. This review highlights recent advances in 'omics' techniques to sequence anaerobic microbial genomes, decipher microbial membership, and characterize CAZyme diversity in anaerobic microbiomes. With a focus on the herbivore rumen, we further discuss methods to discover new CAZymes, including those found within multi-enzyme fungal cellulosomes. Emerging techniques to characterize the interwoven metabolism and spatial interactions between anaerobes are also reviewed, which will prove critical to developing a predictive understanding of anaerobic communities to guide in microbiome engineering.
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Affiliation(s)
- Stephen P Lillington
- Department of Chemical Engineering, University of California, Santa Barbara, CA 93106, United States
| | - Patrick A Leggieri
- Department of Chemical Engineering, University of California, Santa Barbara, CA 93106, United States
| | - Kellie A Heom
- Department of Chemical Engineering, University of California, Santa Barbara, CA 93106, United States
| | - Michelle A O'Malley
- Department of Chemical Engineering, University of California, Santa Barbara, CA 93106, United States.
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