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Wang L, Cui YW. Simultaneous treatment of epichlorohydrin wastewater and polyhydroxyalkanoate recovery by halophilic aerobic granular sludge highly enriched by Halomonas sp. BIORESOURCE TECHNOLOGY 2024; 391:129951. [PMID: 37914058 DOI: 10.1016/j.biortech.2023.129951] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/16/2023] [Revised: 10/29/2023] [Accepted: 10/29/2023] [Indexed: 11/03/2023]
Abstract
The treatment of epichlorohydrin (ECH) wastewater exists chances for achieving cleaner production. This study initially employed moderately halophilic aerobic granular sludge (HAGS) to treat ECH wastewater, and the resulting HAGS was utilized to recover polyhydroxyalkanoate (PHA). During the acclimation process of HAGS, the chemical oxygen demand removal efficiency stabilized at 70 %. Moreover, due to the high enrichment of Halomonas sp. (relative abundance of 86 ± 0.50 %), the maximum PHA content of wasted HAGS was 52.67 wt% in the fermentation process. Simultaneously, the utilization of nuclear magnetic resonance spectroscopy (1H and 13C spectra) and fourier transform infrared spectroscopy for the structural analysis of polymers revealed that polyhydroxybutyrate was the predominant substance extracted from HAGS. In this study, the innovative use of highly enriched HAGS for treating ECH wastewater and simultaneously recovering PHA not only enables the efficient biological treatment of ECH wastewater but also realizes resource recovery of ECH wastewater.
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Affiliation(s)
- Ling Wang
- 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.
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Kundu D, Dutta D, Samanta P, Dey S, Sherpa KC, Kumar S, Dubey BK. Valorization of wastewater: A paradigm shift towards circular bioeconomy and sustainability. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 848:157709. [PMID: 35908693 DOI: 10.1016/j.scitotenv.2022.157709] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/20/2022] [Revised: 07/18/2022] [Accepted: 07/26/2022] [Indexed: 06/15/2023]
Abstract
Limitation in the availability of natural resources like water is the main drive for focussing on resource recovery from wastewater. Rapid urbanization with increased consumption of natural resources has severely affected its management and security. The application of biotechnological processes offers a feasible approach to concentrating and transforming wastewater for resource recovery and a step towards a circular economy. Wastewater generally contains high organic materials, nutrients, metals and chemicals, which have economic value. Hence, its management can be a valuable resource through the implementation of a paradigm transformation for value-added product recovery. This review focuses on the circular economy of "close loop" process by wastewater reuse and energy recovery identifying the emerging technologies for recovering resources across the wastewater treatment phase. Conventional wastewater treatment technologies have been discussed along with the advanced treatment technologies such as algal treatment, anammox technology, microbial fuel cells (MFC). Apart from recovering energy in the form of biogas and biohydrogen, second and third-generation biofuels as well as biohythane and electricity generation have been deliberated. Other options for resource recovery are single-cell protein (SCP), biopolymers as well as recovery of metals and nutrients. The paper also highlights the applications of treated wastewater in agriculture, aquaponics, fisheries and algal cultivation. The concept of Partitions-release-recover (PRR) has been discussed for a better understanding of the filtration treatment coupled with anaerobic digestion. The review provides a critical evaluation on the importance of adopting a circular economy and their role in achieving sustainable development goals (SDGs). Thus, it is imperative that such initiatives towards resource recovery from wastewater through integration of concepts can aid in providing wastewater treatment system with resource efficiency.
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Affiliation(s)
- Debajyoti Kundu
- Waste Re-processing Division, CSIR-National Environmental Engineering Research Institute (NEERI), Nehru Marg, Nagpur 440 020, India
| | - Deblina Dutta
- Waste Re-processing Division, CSIR-National Environmental Engineering Research Institute (NEERI), Nehru Marg, Nagpur 440 020, India
| | - Palas Samanta
- Department of Environmental Science, Sukanta Mahavidyalaya, University of North Bengal, West Bengal 735210, India
| | - Sukhendu Dey
- Department of Environmental Science, The University of Burdwan, Burdwan, West Bengal 713 104, India
| | - Knawang Chhunji Sherpa
- Microbial Processes and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology (CSIR-NIIST), Trivandrum 695 019, Kerala, India
| | - Sunil Kumar
- Waste Re-processing Division, CSIR-National Environmental Engineering Research Institute (NEERI), Nehru Marg, Nagpur 440 020, India.
| | - Brajesh Kumar Dubey
- Department of Civil Engineering, Indian Institute of Technology Kharagpur, Kharagpur, West Bengal 721 302, India
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3
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Dutta D, Arya S, Kumar S. Industrial wastewater treatment: Current trends, bottlenecks, and best practices. CHEMOSPHERE 2021; 285:131245. [PMID: 34246094 DOI: 10.1016/j.chemosphere.2021.131245] [Citation(s) in RCA: 46] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2020] [Revised: 05/12/2021] [Accepted: 06/14/2021] [Indexed: 06/13/2023]
Abstract
Rapid urbanization and industrialization have inextricably linked to water consumption and wastewater generation. Mining resources from industrial wastewater has proved to be an excellent source of secondary raw materials i.e., proficient for providing economic and financial benefits, clean and sustainable resilient environment, and achieving sustainable development goals (SDGs). Treatment of industrial wastewater for reusable resources has become a tedious task for decision-makers due to several bottlenecks and barriers, such as inefficient treatment options, high-cost expenditure, poor infrastructure, lack of financial support, and technical know-how. Most of the existing methods are conventional and fails to provide an economic benefit to the industries and have certain disadvantages. Also, the untreated industrial wastewater is discharged into the open drains, lakes, and rivers that lead to environmental pollution and severe health hazards. This paper has consolidated information about the current trends, opportunities, bottlenecks, and best practices associated with wastewater treatment and scope for the advancement in the existing technologies. Along with the efficient resource recovery, the wastewater could be ideally explored in the development of value-added materials, energy, and product recovery. The concepts, such as the circular economy (CE), partitions-release-recover (PRR), and transforming wastewater into bio factory are anticipated to be more convenient options to tackle the industrial wastewater menace.
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Affiliation(s)
- Deblina Dutta
- School of Environmental Science & Engineering, Indian Institute of Technology Kharagpur, 721 302, India
| | - Shashi Arya
- CSIR- National Environmental Engineering Research Institute (CSIR-NEERI), Nehru Marg, Nagpur, 440 020, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201 002, Uttar Pradesh, India
| | - Sunil Kumar
- CSIR- National Environmental Engineering Research Institute (CSIR-NEERI), Nehru Marg, Nagpur, 440 020, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201 002, Uttar Pradesh, India.
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Zhao J, Cui YW, Zhang HY, Gao ZL. Carbon Source Applied in Enrichment Stage of Mixed Microbial Cultures Limits the Substrate Adaptability for PHA Fermentation Using the Renewable Carbon. Appl Biochem Biotechnol 2021; 193:3253-3270. [PMID: 34117629 DOI: 10.1007/s12010-021-03587-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2021] [Accepted: 05/28/2021] [Indexed: 01/19/2023]
Abstract
Suitability of different substrates for enriched mixed microbial cultures (MMCs) is of importance to the polyhydroxyalkanoate (PHA) fermentation using renewable carbon. In this study, three enriched MMCs were evaluated for their fermentation features and kinetics with different carbon sources (sodium acetate, glucose, or starch). The results showed that the highly specific bacterial community composition was developed depending on the applied carbon source. Correspondence analysis suggested that the genus affiliated in Gammaproteobacteria_unclassified was related to 3-hydroxybutyrate (HB) synthesis in acetate-fed MMC (relative abundance of 38%) and glucose-fed MMC (relative abundance of 76.7%), whereas Vibrio genus was related to 3-hydroxyvalerate (HV) production in glucose-fed MMC (relative abundance of 0.4%) and starch-fed MMC (relative abundance of 94.6%). The acetate-fed MMC could not use glucose and starch as fermentation carbon sources, showing the limitation of microbial species developed with the specific metabolic substrate. Glucose-fed MMC produced the highest PHA cell content of 64.2% cell dry weight when using sodium acetate as the fermentation carbon. Glucose-fed MMC showed wide resilience and adaptation to various carbon sources. When actual landfill leachate was used for fermentation by glucose-fed MMC, maximum PHA cell content of 45.5% cell dry weight and the PHA volumetric productivity of 0.265 g PHA/(L·h) were obtained. This study suggested carbon sources applied in the MMC enrichment stage had a significant influence on utilization of carbon in the fermentation stage.
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Affiliation(s)
- Jin Zhao
- 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.
| | - Hong-Yu Zhang
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Beijing University of Technology, Beijing, 100124, China
| | - Ze-Liang Gao
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Beijing University of Technology, Beijing, 100124, China
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Wen Q, Liu B, Li F, Chen Z. Substrate strategy optimization for polyhydroxyalkanoates producing culture enrichment from crude glycerol. BIORESOURCE TECHNOLOGY 2020; 311:123516. [PMID: 32428849 DOI: 10.1016/j.biortech.2020.123516] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/27/2020] [Revised: 05/06/2020] [Accepted: 05/07/2020] [Indexed: 06/11/2023]
Abstract
Crude glycerol is by-product produced from biodiesel industry and can be converted directly by mixed microbial culture (MMC) into polyhydroxyalkanoates (PHAs). This study investigated the effects of the reverse (SBR_A) and positive (SBR_B) glycerol gradient substrate strategy on PHA-accumulating culture enrichment and the maximum PHA accumulating stability under substrates with different glycerol and volatile fatty acid (VFA) proportion. The results showed that crude glycerol was mainly used for PHA production rather than biomass growth in SBR_A. The maximum qPHA was 0.65 g COD/g X-1·h-1 under sole crude glycerol condition in SBR_A, which was 2.41 times higher than that of SBR_B. Moreover, the PHA accumulating ability of the biomass from SBR_A was more stable than SBR_B. Saccharibacteria_genera_incertae_sedis was for the first time found to be the dominant genus using crude glycerol for PHA production. This research provides an insight into enrichment strategy to effectively enrich PHA-accumulating culture from crude glycerol.
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Affiliation(s)
- Qinxue Wen
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China
| | - Baozhen Liu
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China
| | - Fang Li
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China
| | - Zhiqiang Chen
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China.
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Ike M, Okada Y, Narui T, Sakai K, Kuroda M, Soda S, Inoue D. Potential of waste activated sludge to accumulate polyhydroxyalkanoates and glycogen using industrial wastewater/liquid wastes as substrates. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2019; 80:2373-2380. [PMID: 32245929 DOI: 10.2166/wst.2020.059] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Recovery of the organics in industrial wastewaters/liquid wastes as polyhydroxyalkanoate (PHA) and/or glycogen (GLG) in waste activated sludge is a useful strategy to not only improve the resource value of waste activated sludge but also reduce the energy and cost of waste disposal and wastewater treatment. This study aimed to evaluate the potential of activated sludge to accumulate PHA and GLG using complex substrates (actual and simulated industrial wastewaters/liquid wastes) in addition to various simple organic substrates (organic acids, saccharides, and glycerol). The 24 h PHA and GLG accumulation experiments resulted in the accumulation of up to 25.5%, 6.0% and 14.1% of polyhydroxybutyrate (PHB), polyhydroxyvalerate (PHV) and GLG, respectively, from simple substrates, and up to 9.8%, 0.1% and 14.6%, respectively, from complex substrates. The results indicated that activated sludge can accumulate PHA and GLG even from complex wastewater substrates, although the accumulated PHA and GLG levels were not sufficiently high. The results also indicated that the PHA and GLG accumulation abilities of activated sludge from complex substrates can be drastically enhanced by a short-term acclimation to the corresponding substrate. This study will present the practical implications for value-added resource production through the combined use of waste activated sludge and industrial wastewaters.
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Affiliation(s)
- Michihiko Ike
- Division of Sustainable Energy and Environmental Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan E-mail:
| | - Yukihiro Okada
- Division of Sustainable Energy and Environmental Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan E-mail:
| | - Takaaki Narui
- Division of Sustainable Energy and Environmental Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan E-mail:
| | - Kosuke Sakai
- Division of Sustainable Energy and Environmental Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan E-mail:
| | - Masashi Kuroda
- Division of Sustainable Energy and Environmental Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan E-mail:
| | - Satoshi Soda
- Department of Civil and Environmental Engineering, Ritsumeikan University, 1-1-1 Noji-higashi, Kusatsu, Shiga 525-8577, Japan
| | - Daisuke Inoue
- Division of Sustainable Energy and Environmental Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan E-mail:
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Palmeiro-Sánchez T, Val del Rio A, Fra-Vázquez A, Luis Campos J, Mosquera-Corral A. High-Yield Synthesis of Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) Copolymers in a Mixed Microbial Culture: Effect of Substrate Switching and F/M Ratio. Ind Eng Chem Res 2019. [DOI: 10.1021/acs.iecr.9b03514] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Tania Palmeiro-Sánchez
- Microbiology, School of Natural Sciences and Ryan Institute, National University of Ireland Galway, H91 TK33 Galway, Ireland
- Department of Chemical Engineering, Institute of Technology, Universidade de Santiago de Compostela, E-15705 Santiago de Compostela, Spain
| | - Angeles Val del Rio
- Department of Chemical Engineering, Institute of Technology, Universidade de Santiago de Compostela, E-15705 Santiago de Compostela, Spain
| | - Andrea Fra-Vázquez
- Department of Chemical Engineering, Institute of Technology, Universidade de Santiago de Compostela, E-15705 Santiago de Compostela, Spain
| | - José Luis Campos
- Faculty of Engineering and Science, University Adolfo Ibáñez, Avda. Padre Hurtado 750, 2520000 Viña del Mar, Chile
| | - Anuska Mosquera-Corral
- Department of Chemical Engineering, Institute of Technology, Universidade de Santiago de Compostela, E-15705 Santiago de Compostela, Spain
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Hassan EA, Abd‐Alla MH, Zohri AA, Ragaey MM, Ali SM. Production of butanol and polyhydroxyalkanoate from industrial waste by Clostridium beijerinckiiASU10. INTERNATIONAL JOURNAL OF ENERGY RESEARCH 2019; 43:3640-3652. [DOI: 10.1002/er.4514] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/29/2018] [Accepted: 02/26/2019] [Indexed: 09/02/2023]
Affiliation(s)
- Elhagag Ahmed Hassan
- Botany and Microbiology Department, Faculty of ScienceAssiut University Assiut Egypt
| | | | | | - Marwa M. Ragaey
- Botany Department, Faculty of ScienceNew Valley University El‐Kharja Egypt
| | - Shimaa Mohamed Ali
- Botany Department, Faculty of ScienceNew Valley University El‐Kharja Egypt
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Uma V, Gandhimathi R. Organic removal and synthesis of biopolymer from synthetic oily bilge water using the novel mixed bacterial consortium. BIORESOURCE TECHNOLOGY 2019; 273:169-176. [PMID: 30445269 DOI: 10.1016/j.biortech.2018.11.003] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2018] [Revised: 10/31/2018] [Accepted: 11/01/2018] [Indexed: 06/09/2023]
Abstract
Synthetic oily bilge water (OBW) treatment and subsequent production of biopolymer were studied by using a sequential batch reactor (SBR). The effect of various influencing parameters such as solids retention time (SRT), cycle time (CT), substrate concentration, pH level on the organic removal and synthesis of polyhydroxyalkanoates (PHA) was examined by novel soil bacteria isolated from hydrocarbon contaminated site near Karaikal port, India. The isolates were identified as Pseudomonas tuomuerensis and Pseudomonas nitroreducens using 16S rRNA. Sudan Black B staining was performed to visualize the presence of PHA. The experimental results showed that a decrease in substrate concentration to 5000 mg/L of soluble COD (CODs) showed maximum organic removal (81%) and maximum PHA yields of its cell dry mass (81%). The PHA yield was maximum at SRT of 5 d, pH = 7 and CT of 24 h. The produced PHA was characterized by using FTIR, XRD and SEM analysis.
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Affiliation(s)
- V Uma
- Department of Civil Engineering, National Institute of Technology, Tiruchirappalli, Tamilnadu 620 015, India
| | - R Gandhimathi
- Department of Civil Engineering, National Institute of Technology, Tiruchirappalli, Tamilnadu 620 015, India.
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Puyol D, Batstone DJ, Hülsen T, Astals S, Peces M, Krömer JO. Resource Recovery from Wastewater by Biological Technologies: Opportunities, Challenges, and Prospects. Front Microbiol 2017; 7:2106. [PMID: 28111567 PMCID: PMC5216025 DOI: 10.3389/fmicb.2016.02106] [Citation(s) in RCA: 163] [Impact Index Per Article: 23.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2016] [Accepted: 12/13/2016] [Indexed: 01/07/2023] Open
Abstract
Limits in resource availability are driving a change in current societal production systems, changing the focus from residues treatment, such as wastewater treatment, toward resource recovery. Biotechnological processes offer an economic and versatile way to concentrate and transform resources from waste/wastewater into valuable products, which is a prerequisite for the technological development of a cradle-to-cradle bio-based economy. This review identifies emerging technologies that enable resource recovery across the wastewater treatment cycle. As such, bioenergy in the form of biohydrogen (by photo and dark fermentation processes) and biogas (during anaerobic digestion processes) have been classic targets, whereby, direct transformation of lipidic biomass into biodiesel also gained attention. This concept is similar to previous biofuel concepts, but more sustainable, as third generation biofuels and other resources can be produced from waste biomass. The production of high value biopolymers (e.g., for bioplastics manufacturing) from organic acids, hydrogen, and methane is another option for carbon recovery. The recovery of carbon and nutrients can be achieved by organic fertilizer production, or single cell protein generation (depending on the source) which may be utilized as feed, feed additives, next generation fertilizers, or even as probiotics. Additionlly, chemical oxidation-reduction and bioelectrochemical systems can recover inorganics or synthesize organic products beyond the natural microbial metabolism. Anticipating the next generation of wastewater treatment plants driven by biological recovery technologies, this review is focused on the generation and re-synthesis of energetic resources and key resources to be recycled as raw materials in a cradle-to-cradle economy concept.
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Affiliation(s)
- Daniel Puyol
- Group of Chemical and Environmental Engineering, School of Experimental Sciences and Technology, King Juan Carlos UniversityMostoles, Spain
| | - Damien J. Batstone
- Advanced Water Management Centre, University of Queensland, BrisbaneQLD, Australia
- CRC for Water Sensitive Cities, ClaytonVIC, Australia
| | - Tim Hülsen
- Advanced Water Management Centre, University of Queensland, BrisbaneQLD, Australia
- CRC for Water Sensitive Cities, ClaytonVIC, Australia
| | - Sergi Astals
- Advanced Water Management Centre, University of Queensland, BrisbaneQLD, Australia
| | - Miriam Peces
- Centre for Solid Waste Bioprocessing, School of Civil Engineering, University of Queensland, BrisbaneQLD, Australia
| | - Jens O. Krömer
- Advanced Water Management Centre, University of Queensland, BrisbaneQLD, Australia
- Centre for Microbial Electrochemical Systems, University of Queensland, BrisbaneQLD, Australia
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Effects of carbon sources on the enrichment of halophilic polyhydroxyalkanoate-storing mixed microbial culture in an aerobic dynamic feeding process. Sci Rep 2016; 6:30766. [PMID: 27485896 PMCID: PMC4971467 DOI: 10.1038/srep30766] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2016] [Accepted: 07/08/2016] [Indexed: 11/29/2022] Open
Abstract
Microbial polyhydroxyalkanoate (PHA) production serves as a substitute for petroleum-based plastics. Enriching mixed microbial cultures (MMCs) with the capacity to store PHA is a key precursor for low-cost PHA production. This study investigated the impact of carbon types on enrichment outcomes. Three MMCs were separately fed by acetate sodium, glucose, and starch as an enriching carbon source, and were exposed to long-term aerobic dynamic feeding (ADF) periods. The PHA production capacity, kinetics and stoichiometry of the enrichments, the PHA composition, and the microbial diversity and community composition were explored to determine carbon and enrichment correlations. After 350-cycle enriching periods under feast-famine (F-F) regimes, the MMCs enriched by acetate sodium and glucose contained a maximum PHA content of 64.7% and 60.5% cell dry weight (CDW). The starch-enriched MMC only had 27.3% CDW of PHA. High-throughput sequencing revealed that non-PHA bacteria survived alongside PHA storing bacteria, even under severe F-F selective pressure. Genus of Pseudomonas and Stappia were the possible PHA accumulating bacteria in acetate-enriched MMC. Genus of Oceanicella, Piscicoccus and Vibrio were found as PHA accumulating bacteria in glucose-enriched MMC. Vibrio genus was the only PHA accumulating bacteria in starch-enriched MMC. The community diversity and composition were regulated by the substrate types.
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12
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Ni BJ, Batstone D, Zhao BH, Yu HQ. Microbial Internal Storage Alters the Carbon Transformation in Dynamic Anaerobic Fermentation. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2015; 49:9159-9167. [PMID: 26147721 DOI: 10.1021/acs.est.5b01855] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Microbial internal storage processes have been demonstrated to occur and play an important role in activated sludge systems under both aerobic and anoxic conditions when operating under dynamic conditions. High-rate anaerobic reactors are often operated at a high volumetric organic loading and a relatively dynamic profile, with large amounts of fermentable substrates. These dynamic operating conditions and high catabolic energy availability might also facilitate the formation of internal storage polymers by anaerobic microorganisms. However, so far information about storage under anaerobic conditions (e.g., anaerobic fermentation) as well as its consideration in anaerobic process modeling (e.g., IWA Anaerobic Digestion Model No. 1, ADM1) is still sparse. In this work, the accumulation of storage polymers during anaerobic fermentation was evaluated by batch experiments using anaerobic methanogenic sludge and based on mass balance analysis of carbon transformation. A new mathematical model was developed to describe microbial storage in anaerobic systems. The model was calibrated and validated by using independent data sets from two different anaerobic systems, with significant storage observed, and effectively simulated in both systems. The inclusion of the new anaerobic storage processes in the developed model allows for more successful simulation of transients due to lower accumulation of volatile fatty acids (correction for the overestimation of volatile fatty acids), which mitigates pH fluctuations. Current models such as the ADM1 cannot effectively simulate these dynamics due to a lack of anaerobic storage mechanisms.
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Affiliation(s)
- Bing-Jie Ni
- ‡Advanced Water Management Centre, The University of Queensland, St. Lucia, Queensland 4072, Australia
| | - Damien Batstone
- ‡Advanced Water Management Centre, The University of Queensland, St. Lucia, Queensland 4072, Australia
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