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Shen R, Fang Q, Zhang K, Xiao Y, Cheng M, Xiong B, Zhou W. Optimization of activated sludge polyhydroxyalkanoates(PHAs) synthesis system by performing sludge activity recovery experiments and varying the initial sludge concentration. ENVIRONMENTAL TECHNOLOGY 2024; 45:4682-4690. [PMID: 37970915 DOI: 10.1080/09593330.2023.2283059] [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: 02/16/2023] [Accepted: 06/17/2023] [Indexed: 11/19/2023]
Abstract
Polyhydroxyalkanoates(PHAs) are considered a good alternative to petroleum-based plastics because of their good biodegradability and biocompatibility. The synthesis of PHAs using activated sludge can not only solve the problem of the high cost of pure cultures but also improve the utilization value of activated sludge. In this study, sludge activity recovery experiments were firstly conducted and the effects of different initial sludge concentrations on the activated sludge PHAs synthesis system were further investigated. the initial sludge concentrations were 1#SBR (2800 ± 50) mg/L, 2#SBR (4200 ± 50) mg/L, and 3#SBR (5500 ± 50) mg/L. The results showed that the activity, sedimentation performance and PHAs synthesis capacity of activated sludge were enhanced after the sludge activity recovery experiment. At the initial sludge concentration of 4200 mg/L, the activated sludge PHAs synthesis system was operated stably and the synthesis efficiency of PHAs was enhanced. In contrast, at the initial sludge concentration of 2800 and 5500 mg/L, the steady state of the activated sludge PHAs synthesis system was damaged to different degrees at different times, and the synthesis efficiency of PHAs was greatly reduced.
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Affiliation(s)
- Ruoyu Shen
- School of Civil Engineering, Guangzhou University, Guangzhou, People's Republic of China
| | - Qian Fang
- School of Civil Engineering, Guangzhou University, Guangzhou, People's Republic of China
| | - Kequan Zhang
- School of Civil Engineering, Guangzhou University, Guangzhou, People's Republic of China
| | - Yanyu Xiao
- School of Civil Engineering, Guangzhou University, Guangzhou, People's Republic of China
| | - Meiying Cheng
- School of Civil Engineering, Guangzhou University, Guangzhou, People's Republic of China
| | - Bowen Xiong
- School of Civil Engineering, Guangzhou University, Guangzhou, People's Republic of China
| | - Wuyang Zhou
- School of Civil Engineering, Guangzhou University, Guangzhou, People's Republic of China
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2
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Kukreti N, Kumar P, Kataria R. A sustainable synthesis of polyhydroxyalkanoate from stubble waste as a carbon source using Pseudomonas putida MTCC 2475. Front Bioeng Biotechnol 2024; 12:1343579. [PMID: 38665813 PMCID: PMC11043596 DOI: 10.3389/fbioe.2024.1343579] [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: 11/23/2023] [Accepted: 03/07/2024] [Indexed: 04/28/2024] Open
Abstract
Polyhydroxyalkanoates (PHAs) are biodegradable polymers that can be produced from lignocellulosic biomass by microorganisms. Cheap and readily available raw material, such as corn stover waste, has the potential to lessen the cost of PHA synthesis. In this research study, corn stover is pretreated with NaOH under conditions optimized for high cellulose and low lignin with central composite design (CCD) followed by characterization using Fourier-transform infrared spectroscopy (FTIR), thermal gravimetric analysis (TGA), and scanning electron microscopy (SEM). Design expert software performed further optimization of alkali pretreated corn stover for high total reducing sugar (TRS) enhancement using CCD using response surface methodology (RSM). The optimized condition by RSM produced a TRS yield of 707.19 mg/g. Fermentation using corn stover hydrolysate by Pseudomonas putida MTCC 2475 gave mcl-PHA detected through gas c hromatography - t andem m ass s pectrometry (GC-MS/MS) and characterization of the PHA film by differential scanning calorimetry (DSC), FTIR, and nuclear magnetic resonance (NMR). Thus, this research paper focuses on using agriculture (stubble) waste as an alternative feedstock for PHA production.
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3
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Li RH, Huang J, Liu CX, Yu K, Guo F, Li Y, Chen ZH, Wang X, Zhao RX, Zhang JY, Liang JJ, Li Y, Lin L, Sun L, Li XY, Li B. Genome-centric metagenomics provides new insights into metabolic pathways of polyhydroxyalkanoates biosynthesis and functional microorganisms subsisting on municipal organic wastes. WATER RESEARCH 2023; 244:120512. [PMID: 37633209 DOI: 10.1016/j.watres.2023.120512] [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: 05/04/2023] [Revised: 07/23/2023] [Accepted: 08/18/2023] [Indexed: 08/28/2023]
Abstract
The microbial community of a sequencing batch reactor operated under feast and famine conditions for production of polyhydroxyalkanoates (PHAs) was characterized through high-throughput sequencing and metagenomic analysis. The fermented food waste and chemically-enhanced primary sludge was fed in this bioreactor. After acclimation, the PHA yield achieved as high as 0.60-0.69 g CODPHA/g CODS. The complete changes of microbial community structure were found during shifts of feedstock. A synthesis of SCL/MCL-PHAs pathway was established for PHA-producing bioreactor in this mixed-culture system. The structure-performance relationship of PHA-producing microbial community and feedstock composition was investigated. The results showed that microbial community tends to be decentralized and prefer team work for PHA synthesis to consume the multiple substrates and digest inevitable non-VFA contents in fermented liquor. This study also discovered unreported potential PHA producers (e.g., genera Tabrizicola, Nannocystis, Ga0077539, Ga0077559, JOSHI-001, SNC69-320 and UBA2334) subsisting on municipal organic wastes and expands the current knowledge about mixed-culture system that the PHA synthesis pathway is widely existed in activated sludge.
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Affiliation(s)
- Ruo-Hong Li
- Shenzhen Engineering Research Laboratory for Sludge and Food Waste Treatment and Resource Recovery, Tsinghua Shenzhen International Graduate School, Tsinghua University, China; School of Environmental Science and Engineering, Sun Yat-sen University, China
| | - Jin Huang
- Shenzhen Engineering Research Laboratory for Sludge and Food Waste Treatment and Resource Recovery, Tsinghua Shenzhen International Graduate School, Tsinghua University, China; Shenzhen Environmental Science and New Energy Laboratory, Tsinghua-Berkeley Shenzhen Institute, Tsinghua University, China
| | - Cheng-Xi Liu
- Shenzhen Engineering Research Laboratory for Sludge and Food Waste Treatment and Resource Recovery, Tsinghua Shenzhen International Graduate School, Tsinghua University, China
| | - Ke Yu
- School of Environment and Energy, Shenzhen Graduate School, Peking University, China
| | - Feng Guo
- School of Life Sciences, Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Xiamen University, Xiamen, China
| | - You Li
- Shenzhen Engineering Research Laboratory for Sludge and Food Waste Treatment and Resource Recovery, Tsinghua Shenzhen International Graduate School, Tsinghua University, China
| | - Zuo-Hong Chen
- Shenzhen Engineering Research Laboratory for Sludge and Food Waste Treatment and Resource Recovery, Tsinghua Shenzhen International Graduate School, Tsinghua University, China; Shenzhen Environmental Science and New Energy Laboratory, Tsinghua-Berkeley Shenzhen Institute, Tsinghua University, China
| | - Xuan Wang
- Shenzhen Engineering Research Laboratory for Sludge and Food Waste Treatment and Resource Recovery, Tsinghua Shenzhen International Graduate School, Tsinghua University, China
| | - Ren-Xin Zhao
- Shenzhen Engineering Research Laboratory for Sludge and Food Waste Treatment and Resource Recovery, Tsinghua Shenzhen International Graduate School, Tsinghua University, China
| | - Jia-Yu Zhang
- Shenzhen Engineering Research Laboratory for Sludge and Food Waste Treatment and Resource Recovery, Tsinghua Shenzhen International Graduate School, Tsinghua University, China
| | - Jia-Jin Liang
- Shenzhen Engineering Research Laboratory for Sludge and Food Waste Treatment and Resource Recovery, Tsinghua Shenzhen International Graduate School, Tsinghua University, China
| | - Yun Li
- Environmental Engineering Research Centre, Department of Civil Engineering, The University of Hong Kong, Hong Kong, China
| | - Lin Lin
- Shenzhen Engineering Research Laboratory for Sludge and Food Waste Treatment and Resource Recovery, Tsinghua Shenzhen International Graduate School, Tsinghua University, China
| | - Lianpeng Sun
- School of Environmental Science and Engineering, Sun Yat-sen University, China
| | - Xiao-Yan Li
- Shenzhen Engineering Research Laboratory for Sludge and Food Waste Treatment and Resource Recovery, Tsinghua Shenzhen International Graduate School, Tsinghua University, China; Shenzhen Environmental Science and New Energy Laboratory, Tsinghua-Berkeley Shenzhen Institute, Tsinghua University, China; Environmental Engineering Research Centre, Department of Civil Engineering, The University of Hong Kong, Hong Kong, China.
| | - Bing Li
- Shenzhen Engineering Research Laboratory for Sludge and Food Waste Treatment and Resource Recovery, Tsinghua Shenzhen International Graduate School, Tsinghua University, China.
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4
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Xiong B, Fang Q, Wei T, Wang Z, Shen R, Cheng M, Zhou W. Chemical digestion method to promote activated sludge cell wall breaking and optimize the polyhydroxyalkanoate (PHA) extraction process. Int J Biol Macromol 2023; 240:124369. [PMID: 37031788 DOI: 10.1016/j.ijbiomac.2023.124369] [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: 01/04/2023] [Revised: 03/20/2023] [Accepted: 04/04/2023] [Indexed: 04/11/2023]
Abstract
A novel protocol for the recovery of PHA from mixed-cultures proposed. In this experiment, activated sludge for PHA synthesis was investigated and a two-stage chemical digestion method was used for activated sludge to improve the yield of PHA. The highest PHA extraction combination that could be obtained in this experiment was sodium hypochlorite(NaClO) plus sodium dodecyl sulfate (SDS), and the optimal concentration of NaClO solution was 25 % (v/v), and the ratio of the dry weight of activated sludge to SDS was 1:2. The recovery and purity of PHA were 72.14 % and 54.47 %, respectively. The reaction time between NaClO and activated sludge affects the recovery of PHA, and the optimal reaction time of NaClO was experimentally obtained as 30 min. The purity of the PHA extract obtained after purification using methanol was improved.
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Affiliation(s)
- Bowen Xiong
- College of Civil Engineering, Guangzhou University, Guangzhou 510006, PR China
| | - Qian Fang
- College of Civil Engineering, Guangzhou University, Guangzhou 510006, PR China.
| | - Tong Wei
- College of Civil Engineering, Guangzhou University, Guangzhou 510006, PR China
| | - Zhihui Wang
- College of Civil Engineering, Guangzhou University, Guangzhou 510006, PR China
| | - Ruoyu Shen
- College of Civil Engineering, Guangzhou University, Guangzhou 510006, PR China
| | - Meiying Cheng
- College of Civil Engineering, Guangzhou University, Guangzhou 510006, PR China
| | - Wuyang Zhou
- College of Civil Engineering, Guangzhou University, Guangzhou 510006, PR China
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Lucia C, Laudicina VA, Badalucco L, Galati A, Palazzolo E, Torregrossa M, Viviani G, Corsino SF. Challenges and opportunities for citrus wastewater management and valorisation: A review. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2022; 321:115924. [PMID: 36104880 DOI: 10.1016/j.jenvman.2022.115924] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2022] [Revised: 07/27/2022] [Accepted: 07/30/2022] [Indexed: 06/15/2023]
Abstract
Citrus wastewaters (CWWs) are by-products of the citrus fruit transformation process. Currently, more than 700 million of m³ of CWWs per year are produced worldwide. Until nowadays, the management of CWWs is based on a take-make-use-dispose model. Indeed, after being produced within a citrus processing industry, CWWs are subjected to treatment and then discharged into the environment. Now, the European Union is pushing towards a take-make-use-reuse management model, which suggests to provide for the minimization of residual pollutants simultaneously with their exploitation through a biorefinery concept. Indeed, the recovery of energy nutrients and other value-added products held by CWWs may promote environmental sustainability and close the nutrient cycles in line with the circular bio-economy perspective. Unfortunately, knowledge about the benefits and disadvantages of available technologies for the management and valorisation of CWWs are very fragmentary, thus not providing to the scientific community and stakeholders an appropriate approach. Moreover, available studies focus on a specific treatment/valorisation pathway of CWWs and an overall vision is still missing. This review aims to provide an integrated approach for the sustainable management of CWWs to be proposed to company managers and other stakeholders within the legislative boundaries and in line with the circular bio-economy perspective. To this aim, firstly, a concise analysis of citrus wastewater characteristics and the main current regulations on CWWs are reported and discussed. Then, the main technologies with a general comparison of their pros and cons, and alternative pathways for CWWs utilization are presented and discussed. Finally, a focus was paid to the economic feasibility of the solutions proposed to date relating to the recovery of the CWWs for the production of both value-added compounds and agricultural reuse. Based on literature analysis an integrated approach for a sustainable CWWs management is proposed. Such an approach suggests that after chemicals recovery by biorefinery, wastewaters should be directly used for crop irrigation if allowed by regulations or addressed to treatment plant. The latter way should be preferred when CWWs cannot be directly applied to soil due to lack of concomitance between CWWs production and crop needs. In such a way, treated wastewater should be reused after tertiary treatments for crop irrigation, whereas produced sludges should be undergone to dewatering treatment before being reused as organic amendment to improve soil fertility. Finally, this review invite European institutions and each Member State to promote common and specific legislations to overcome the fragmentation of the regulatory framework regarding CWWs reuse.
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Affiliation(s)
- Caterina Lucia
- Department of Agriculture, Food and Forest Sciences, University of Palermo, Viale delle Scienze, Building 4, 90128, Palermo, Italy
| | - Vito Armando Laudicina
- Department of Agriculture, Food and Forest Sciences, University of Palermo, Viale delle Scienze, Building 4, 90128, Palermo, Italy.
| | - Luigi Badalucco
- Department of Agriculture, Food and Forest Sciences, University of Palermo, Viale delle Scienze, Building 4, 90128, Palermo, Italy
| | - Antonino Galati
- Department of Agriculture, Food and Forest Sciences, University of Palermo, Viale delle Scienze, Building 4, 90128, Palermo, Italy
| | - Eristanna Palazzolo
- Department of Agriculture, Food and Forest Sciences, University of Palermo, Viale delle Scienze, Building 4, 90128, Palermo, Italy
| | - Michele Torregrossa
- Department of Engineering, University of Palermo, Viale delle Scienze, Building 8, 90128, Palermo, Italy
| | - Gaspare Viviani
- Department of Engineering, University of Palermo, Viale delle Scienze, Building 8, 90128, Palermo, Italy
| | - Santo Fabio Corsino
- Department of Engineering, University of Palermo, Viale delle Scienze, Building 8, 90128, Palermo, Italy
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Simona C, Laura L, Francesco V, Marianna V, Cristina MG, Barbara T, Mauro M, Simona R. Effect of the organic loading rate on the PHA-storing microbiome in sequencing batch reactors operated with uncoupled carbon and nitrogen feeding. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 825:153995. [PMID: 35192819 DOI: 10.1016/j.scitotenv.2022.153995] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2021] [Revised: 01/28/2022] [Accepted: 02/15/2022] [Indexed: 06/14/2023]
Abstract
Over the last years, in a search for sustainable and biodegradable alternatives to petrol-based plastics, biotechnological applications turned to the potentialities of mixed microbial cultures (MMC) for producing polyhydroxyalkanoates (PHAs). Under a feast and famine regime, an uncoupled carbon (C) and nitrogen (N)-feeding strategy may be adopted by dosing the C-source at the beginning of the feast and the N-source at the beginning of the famine in order to stimulate a PHA storage response and microbial growth. Even though this strategy has been already successfully applied for the PHA production, very few information is to date available regarding the MMC operating in these systems and the influence of Organic Loading Rate (OLR) on their selection and enrichment. To fill the gap, this study investigated the effect of the OLR on the selection of PHA-accumulating microorganisms in a sequencing batch reactor (SBR) operated with an uncoupled C and N feeding strategy. The SBR cycle length was set at 12 h and four OLRs values (4.25, 8.50, 12.75 and 18 gCOD L-1 d-1) were tested by changing the concentration of the feeding solution, made of a synthetic mixture of acetic (85% of the overall COD) and propionic (15%) acids. The PHA-storage yield increased by increasing the OLR (up to 0.69 COD/COD at 12.75 gCOD L-1 d-1) but significantly decreased (0.27 COD/COD) at 18 gCOD L-1 d-1 concomitantly with a longer feast phase and a lower PHA content in the biomass at the end of the feast phase. The selective pressure induced by the applied OLRs strongly influenced the microbiome composition revealing a high content of putative PHA-storing bacteria, such as Rhodobacter, Thauera and Paracoccus, in the SBR operated at OLRs 4.25, 8.50 and 12.75 g COD L-1 d-1 (up to 97.4% of total reads) and a low content (5.4%) in the SBR at 18 g COD L-1 d-1where the predominance of genus Nitrinicola was instead observed.
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Affiliation(s)
- Crognale Simona
- Water Research Institute, National Research Council (IRSA-CNR), Monterotondo, Rome, Italy.
| | - Lorini Laura
- Department of Chemistry, Sapienza University of Rome, Piazzale Aldo Moro 5, 00185 Rome, Italy
| | - Valentino Francesco
- Department of Environmental Sciences, Informatics and Statistics, "Cà Foscari" University of Venice, Via Torino 155, 30170 Mestre-Venice, Italy
| | - Villano Marianna
- Department of Chemistry, Sapienza University of Rome, Piazzale Aldo Moro 5, 00185 Rome, Italy
| | - Marzo Gago Cristina
- Department of Chemistry, Sapienza University of Rome, Piazzale Aldo Moro 5, 00185 Rome, Italy; Department of Chemical Engineering and Food Technology, Faculty of Science, IVAGRO, University of Cádiz, Puerto Real, Spain
| | - Tonanzi Barbara
- Water Research Institute, National Research Council (IRSA-CNR), Monterotondo, Rome, Italy
| | - Majone Mauro
- Department of Chemistry, Sapienza University of Rome, Piazzale Aldo Moro 5, 00185 Rome, Italy
| | - Rossetti Simona
- Water Research Institute, National Research Council (IRSA-CNR), Monterotondo, Rome, Italy
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7
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Zhou W, Colpa DI, Geurkink B, Euverink GJW, Krooneman J. The impact of carbon to nitrogen ratios and pH on the microbial prevalence and polyhydroxybutyrate production levels using a mixed microbial starter culture. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 811:152341. [PMID: 34921889 DOI: 10.1016/j.scitotenv.2021.152341] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/09/2021] [Revised: 11/16/2021] [Accepted: 12/08/2021] [Indexed: 06/14/2023]
Abstract
Growth conditions have been frequently studied in optimizing polyhydroxybutyrate (PHB) production, while few studies were performed to unravel the dynamic mixed microbial consortia (MMCs) in the process. In this study, the relationship between growth conditions (C/N ratios and pH) and the corresponding key-microbes were identified and monitored during PHB accumulation. The highest PHB level (70 wt% of dry cell mass) was obtained at pH 9, C/N 40, and acetic acid 10 g/L. Linking the dominant genera with the highest point of PHB accumulation, Thauera was the most prevalent species in all MMCs of pH 9, except when a C/N ratio of 1 was applied. Notably, dominant bacteria shifted at pH 7 (C/N 10) from Thauera (0 h) to Paracoccus, and subsequently to Alcaligenes following the process of PHB accumulation and consumption. Further understanding of the relationship between the structure of the microbial community and the performance will be beneficial for regulating and obtaining high PHB accumulation within an MMC. Our study illustrates the impact of C/N ratios and pH on microbial prevalence and PHB production levels using a mixed microbial starter culture. This knowledge will broaden industrial perspectives for regulating high PHB production and timely harvesting.
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Affiliation(s)
- Wen Zhou
- Products and Processes for Biotechnology, Engineering and Technology Institute Groningen, Faculty of Science and Engineering, University of Groningen, Groningen, the Netherlands
| | - Dana Irene Colpa
- Products and Processes for Biotechnology, Engineering and Technology Institute Groningen, Faculty of Science and Engineering, University of Groningen, Groningen, the Netherlands
| | - Bert Geurkink
- Wetsus, European Centre of Excellence for Sustainable Water Technology, Leeuwarden, the Netherlands
| | - Gert-Jan Willem Euverink
- Products and Processes for Biotechnology, Engineering and Technology Institute Groningen, Faculty of Science and Engineering, University of Groningen, Groningen, the Netherlands
| | - Janneke Krooneman
- Products and Processes for Biotechnology, Engineering and Technology Institute Groningen, Faculty of Science and Engineering, University of Groningen, Groningen, the Netherlands.
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8
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Awasthi MK, Singh E, Binod P, Sindhu R, Sarsaiya S, Kumar A, Chen H, Duan Y, Pandey A, Kumar S, Taherzadeh MJ, Li J, Zhang Z. Biotechnological strategies for bio-transforming biosolid into resources toward circular bio-economy: A review. RENEWABLE AND SUSTAINABLE ENERGY REVIEWS 2022; 156:111987. [DOI: 10.1016/j.rser.2021.111987] [Citation(s) in RCA: 31] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/20/2023]
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9
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Zhu Y, Ai M, Jia X. Optimization of a Two-Species Microbial Consortium for Improved Mcl-PHA Production From Glucose-Xylose Mixtures. Front Bioeng Biotechnol 2022; 9:794331. [PMID: 35083203 PMCID: PMC8784772 DOI: 10.3389/fbioe.2021.794331] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2021] [Accepted: 12/20/2021] [Indexed: 11/13/2022] Open
Abstract
Polyhydroxyalkanoates (PHAs) have attracted much attention as a good substitute for petroleum-based plastics, especially mcl-PHA due to their superior physical and mechanical properties with broader applications. Artificial microbial consortia can solve the problems of low metabolic capacity of single engineered strains and low conversion efficiency of natural consortia while expanding the scope of substrate utilization. Therefore, the use of artificial microbial consortia is considered a promising method for the production of mcl-PHA. In this work, we designed and constructed a microbial consortium composed of engineered Escherichia coli MG1655 and Pseudomonas putida KT2440 based on the "nutrition supply-detoxification" concept, which improved mcl-PHA production from glucose-xylose mixtures. An engineered E. coli that preferentially uses xylose was engineered with an enhanced ability to secrete acetic acid and free fatty acids (FFAs), producing 6.44 g/L acetic acid and 2.51 g/L FFAs with 20 g/L xylose as substrate. The mcl-PHA producing strain of P. putida in the microbial consortium has been engineered to enhance its ability to convert acetic acid and FFAs into mcl-PHA, producing 0.75 g/L mcl-PHA with mixed substrates consisting of glucose, acetic acid, and octanoate, while also reducing the growth inhibition of E. coli by acetic acid. The further developed artificial microbial consortium finally produced 1.32 g/L of mcl-PHA from 20 g/L of a glucose-xylose mixture (1:1) after substrate competition control and process optimization. The substrate utilization and product synthesis functions were successfully divided into the two strains in the constructed artificial microbial consortium, and a mutually beneficial symbiosis of "nutrition supply-detoxification" with a relatively high mcl-PHA titer was achieved, enabling the efficient accumulation of mcl-PHA. The consortium developed in this study is a potential platform for mcl-PHA production from lignocellulosic biomass.
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Affiliation(s)
- Yinzhuang Zhu
- Department of Biochemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin, China
| | - Mingmei Ai
- Department of Biochemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin, China
| | - Xiaoqiang Jia
- Department of Biochemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin, China
- Frontier Science Center for Synthetic Biology and Key Laboratory of Systems Bioengineering (MOE), School of Chemical Engineering and Technology, Tianjin University, Tianjin, China
- Collaborative Innovation Center of Chemical Science and Engineering, Tianjin, China
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10
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Ai M, Zhu Y, Jia X. Recent advances in constructing artificial microbial consortia for the production of medium-chain-length polyhydroxyalkanoates. World J Microbiol Biotechnol 2021; 37:2. [PMID: 33392870 DOI: 10.1007/s11274-020-02986-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2020] [Accepted: 12/20/2020] [Indexed: 11/29/2022]
Abstract
Polyhydroxyalkanoates (PHAs) are a class of high-molecular-weight polyesters made from hydroxy fatty acid monomers. PHAs produced by microorganisms have diverse structures, variable physical properties, and good biodegradability. They exhibit similar physical properties to petroleum-based plastics but are much more environmentally friendly. Medium-chain-length polyhydroxyalkanoates (mcl-PHAs), in particular, have attracted much interest because of their low crystallinity, low glass transition temperature, low tensile strength, high elongation at break, and customizable structure. Nevertheless, high production costs have hindered their practical application. The use of genetically modified organisms can reduce production costs by expanding the scope of substrate utilization, improving the conversion efficiency of substrate to product, and increasing the yield of mcl-PHAs. The yield of mcl-PHAs produced by a pure culture of an engineered microorganism was not high enough because of the limitations of the metabolic capacity of a single microorganism. The construction of artificial microbial consortia and the optimization of microbial co-cultivation have been studied. This type of approach avoids the addition of precursor substances and helps synthesize mcl-PHAs more efficiently. In this paper, we reviewed the design and construction principles and optimized control strategies for artificial microbial consortia that produce mcl-PHAs. We described the metabolic advantages of co-cultivating artificial microbial consortia using low-value substrates and discussed future perspectives on the production of mcl-PHAs using artificial microbial consortia.
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Affiliation(s)
- Mingmei Ai
- Department of Biochemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China
| | - Yinzhuang Zhu
- Department of Biochemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China
| | - Xiaoqiang Jia
- Department of Biochemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China.
- Frontier Science Center for Synthetic Biology and Key Laboratory of Systems Bioengineering (MOE), School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300350, China.
- SynBio Research Platform, Collaborative Innovation Center of Chemical Science and Engineering, Tianjin, 300072, China.
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11
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Valentino F, Lorini L, Gottardo M, Pavan P, Majone M. Effect of the temperature in a mixed culture pilot scale aerobic process for food waste and sewage sludge conversion into polyhydroxyalkanoates. J Biotechnol 2020; 323:54-61. [DOI: 10.1016/j.jbiotec.2020.07.022] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2020] [Revised: 07/20/2020] [Accepted: 07/28/2020] [Indexed: 11/30/2022]
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12
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Guzik M, Witko T, Steinbüchel A, Wojnarowska M, Sołtysik M, Wawak S. What Has Been Trending in the Research of Polyhydroxyalkanoates? A Systematic Review. Front Bioeng Biotechnol 2020; 8:959. [PMID: 33014998 PMCID: PMC7513618 DOI: 10.3389/fbioe.2020.00959] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2020] [Accepted: 07/24/2020] [Indexed: 12/24/2022] Open
Abstract
Over the past decades, enormous progress has been achieved with regard to research on environmentally friendly polymers. One of the most prominent families of such biopolymers are bacterially synthesized polyhydroxyalkanoates (PHAs) that have been known since the 1920s. However, only as recent as the 1990s have extensive studies sprung out exponentially in this matter. Since then, different areas of exploration of these intriguing materials have been uncovered. However, no systematic review of undertaken efforts has been conducted so far. Therefore, we have performed an unbiased search of up-to-date literature to reveal trending topics in the research of PHAs over the past three decades by data mining of 2,227 publications. This allowed us to identify eight past and current trends in this area. Our study provides a comprehensive review of these trends and speculates where PHA research is heading.
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Affiliation(s)
- Maciej Guzik
- Jerzy Haber Institute of Catalysis and Surface Chemistry Polish Academy of Sciences, Kraków, Poland
| | - Tomasz Witko
- Jerzy Haber Institute of Catalysis and Surface Chemistry Polish Academy of Sciences, Kraków, Poland
| | - Alexander Steinbüchel
- Institut für Molekulare Mikrobiologie und Biotechnologie, Westfälische Wilhelms-Universität Münster, Münster, Germany
- Environmental Sciences Department, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Magdalena Wojnarowska
- Department of Product Technology and Ecology, Cracow University of Economics, Kraków, Poland
| | - Mariusz Sołtysik
- Department of Management Process, Cracow University of Economics, Kraków, Poland
| | - Sławomir Wawak
- Department of Management Process, Cracow University of Economics, Kraków, Poland
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13
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Moretto G, Russo I, Bolzonella D, Pavan P, Majone M, Valentino F. An urban biorefinery for food waste and biological sludge conversion into polyhydroxyalkanoates and biogas. WATER RESEARCH 2020; 170:115371. [PMID: 31835138 DOI: 10.1016/j.watres.2019.115371] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2019] [Revised: 11/08/2019] [Accepted: 12/04/2019] [Indexed: 06/10/2023]
Abstract
This study focuses on the application of the concept of circular economy, with the creation of added-value marketable products and energy from organic waste while minimizing environmental impacts. Within this purpose, an urban biorefinery technology chain has been developed at pilot scale in the territorial context of the Treviso municipality (northeast Italy) for the production of biopolymers (polyhydroxyalkanoates, PHAs) and biogas from waste of urban origin. The piloting system (100-380 L) comprised the following units: a) acidogenic fermentation of the organic fraction of municipal solid waste (OFMSW) and biological sludge; b) two solid/liquid separation steps consisting of a coaxial centrifuge and a tubular membrane (0.2 μm porosity); c) a Sequencing Batch Reactor (SBR) for aerobic PHA-storing biomass production; d) aerobic fed-batch PHA accumulation reactor and e) Anaerobic co-digestion (ACoD). The thermal pre-treatment (72 °C, 48 h) of the feedstock enhanced the solubilization of the organic matter, which was converted into volatile fatty acids (VFAs) in batch mode under mesophilic fermentation conditions (37 °C). The VFA content increased up to 30 ± 3 g COD/L (overall yield 0.65 ± 0.04 g CODVFA/g VS(0)), with high CODVFA/CODSOL (0.86 ± 0.05). The high CODVFA/CODSOL ratio enhanced the PHA-storing biomass selection in the SBR by limiting the growth of the non-storing microbial population. Under fully aerobic feast-famine regime, the selection reactor was continuously operated for 6 months at an average organic loading rate (OLR) of 4.4 ± 0.6 g COD/L d and hydraulic retention time (HRT) of 1 day (equal to SRT). The ACoD process (HRT 15 days, OLR 3.0-3.5 kg VS/m3 d) allowed to recover the residual solid-rich overflows generated by the two solid/liquid separation units with the production of biogas (SGP 0.44-0.51 m3/kg VS) and digestate. An overall yield of 7.6% wt PHA/VS(0) has been estimated from the mass balance. In addition, a preliminary insight into potential social acceptance and barriers regarding organic waste-derived products was obtained.
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Affiliation(s)
- Giulia Moretto
- Department of Environmental Sciences, Informatics and Statistics, University Ca' Foscari of Venice, Via Torino 155, 30170, Venezia, Mestre, Italy
| | - Ivan Russo
- Department of Business Administration, University of Verona, Via Cantarane 24, Verona, 37129, Italy
| | - David Bolzonella
- Department of Biotechnology, University of Verona, Strada Le Grazie 15, 37134, Verona, Italy
| | - Paolo Pavan
- Department of Environmental Sciences, Informatics and Statistics, University Ca' Foscari of Venice, Via Torino 155, 30170, Venezia, Mestre, Italy
| | - Mauro Majone
- Department of Chemistry, "La Sapienza" University of Rome, P.le Aldo Moro 5, 00185, Rome, Italy
| | - Francesco Valentino
- Department of Chemistry, "La Sapienza" University of Rome, P.le Aldo Moro 5, 00185, Rome, Italy.
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14
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Cheah YK, Vidal-Antich C, Dosta J, Mata-Álvarez J. Volatile fatty acid production from mesophilic acidogenic fermentation of organic fraction of municipal solid waste and food waste under acidic and alkaline pH. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2019; 26:35509-35522. [PMID: 31111388 PMCID: PMC6923264 DOI: 10.1007/s11356-019-05394-6] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2018] [Accepted: 05/06/2019] [Indexed: 05/17/2023]
Abstract
This study is focused on the effects of pH on the production of volatile fatty acids (VFAs) and their distribution through the acidogenic fermentation of source-sorted organic fraction of municipal solid waste (OFMSW) from a mechanical-biological treatment (MBT) plant, and food waste (FW) from a university canteen. In semi-continuous lab-scale digesters using OFMSW at a hydraulic retention time (HRT) of 3.5 days under acidic conditions (pH 6.0), the VFA concentration in the effluent increased to 9.8-11.5 g L-1 (VS content of the feedstock between 4.2 and 5.2% w/w), while its individual VFA profiling was similar to the influent which was already pre-fermented (namely, C2 35-41%, C3 18-22%, C4 17-21%, and C5 9-12%). When working with the same conditions but using FW as feedstock, an effluent with a VFA concentration up to 11.5 g VFA L-1 (FW with a VS content of 5.5% w/w) and a stable distribution of C2 and C4 acids (up to 60.3% and 12.9%, respectively) but with very low quantities of C3 and C5 acids (lower than 1.8 and 2.7%, respectively) was obtained. Anaerobic batch tests using FW revealed that alkaline pH near 9 could lead to higher VFA production with high acetic acid content when compared to pH 6. In the semi-continuous fermenters working at alkaline conditions (pH 9.5-10) using OFMSW and FW, an enhanced solubilization of organic matter was registered with respect to the fermenters working under acidic conditions. This fact was not reflected in a higher VFA production when using OFMSW as feedstock, probably due to free ammonia inhibition, since OFMSW was mixed in the MBT plant with supernatant from anaerobic digestion of this biowaste. However, when using FW, alkaline conditions lead to an enhanced VFA production with respect to the reactor working under acidic conditions, being acetic acid the predominant product, which represented up to 91% of the VFA spectrum obtained.
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Affiliation(s)
- Yen-Keong Cheah
- Department of Chemical Engineering and Analytical Chemistry, University of Barcelona, 08028, Barcelona, Catalonia, Spain
| | - Carme Vidal-Antich
- Department of Chemical Engineering and Analytical Chemistry, University of Barcelona, 08028, Barcelona, Catalonia, Spain
| | - Joan Dosta
- Department of Chemical Engineering and Analytical Chemistry, University of Barcelona, 08028, Barcelona, Catalonia, Spain.
| | - Joan Mata-Álvarez
- Department of Chemical Engineering and Analytical Chemistry, University of Barcelona, 08028, Barcelona, Catalonia, Spain
- Water Research Institute, University of Barcelona, 08001, Barcelona, Catalonia, Spain
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15
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Crognale S, Tonanzi B, Valentino F, Majone M, Rossetti S. Microbiome dynamics and phaC synthase genes selected in a pilot plant producing polyhydroxyalkanoate from the organic fraction of urban waste. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 689:765-773. [PMID: 31280158 DOI: 10.1016/j.scitotenv.2019.06.491] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2019] [Revised: 06/28/2019] [Accepted: 06/28/2019] [Indexed: 06/09/2023]
Abstract
This study analyses the bacterial population dynamics of a mixed microbial community (MMC) selected in a pilot plant producing polyhydroxyalkanoate (PHA) from the fermentation of the organic fraction of urban waste (OFMSW) and sewage sludge (SS). 16S rRNA gene high-throughput sequencing revealed the occurrence of a variety of PHA accumulating bacteria that ensured a stable PHA production in an open system operating with real substrates and without temperature control. The Volatile Fatty Acids (VFA) changes in the feed and the temperature variation affected the dynamics of the PHA-accumulating bacteria over the plant operation. Remarkably, the higher PHA content was associated to a MMC largely comprising of Hydrogenophaga species during the operation at higher working temperature. The involvement of a heterogeneous PHA-accumulating MMC was associated with a high phaC synthase genes biodiversity confirming the occurrence of a functional redundancy.
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Affiliation(s)
- Simona Crognale
- Water Research Institute, National Research Council of Italy (IRSA - CNR), Via Salaria, km 29.300, Monterotondo, 00015 Rome, Italy
| | - Barbara Tonanzi
- Water Research Institute, National Research Council of Italy (IRSA - CNR), Via Salaria, km 29.300, Monterotondo, 00015 Rome, Italy
| | - Francesco Valentino
- Department of Chemistry, "La Sapienza" University of Rome, P.le Aldo Moro 5, 00185 Rome, Italy
| | - Mauro Majone
- Department of Chemistry, "La Sapienza" University of Rome, P.le Aldo Moro 5, 00185 Rome, Italy
| | - Simona Rossetti
- Water Research Institute, National Research Council of Italy (IRSA - CNR), Via Salaria, km 29.300, Monterotondo, 00015 Rome, Italy.
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16
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Valentino F, Moretto G, Lorini L, Bolzonella D, Pavan P, Majone M. Pilot-Scale Polyhydroxyalkanoate Production from Combined Treatment of Organic Fraction of Municipal Solid Waste and Sewage Sludge. Ind Eng Chem Res 2019. [DOI: 10.1021/acs.iecr.9b01831] [Citation(s) in RCA: 67] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Francesco Valentino
- Department of Chemistry, “La Sapienza” University of Rome, P.le Aldo Moro 5, 00185 Rome, Italy
| | - Giulia Moretto
- Department of Environmental Science, Informatics and Statistics, Via Torino 155, 30170 Venezia Mestre, Italy
| | - Laura Lorini
- Department of Chemistry, “La Sapienza” University of Rome, P.le Aldo Moro 5, 00185 Rome, Italy
| | - David Bolzonella
- Department of Biotechnology, University of Verona, Strada Le Grazie 15, 37134 Verona, Italy
| | - Paolo Pavan
- Department of Environmental Science, Informatics and Statistics, Via Torino 155, 30170 Venezia Mestre, Italy
| | - Mauro Majone
- Department of Chemistry, “La Sapienza” University of Rome, P.le Aldo Moro 5, 00185 Rome, Italy
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17
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Impact of Organic Acids Supplementation to Hardwood Spent Sulfite Liquor as Substrate for the Selection of Polyhydroxyalkanoates-Producing Organisms. FERMENTATION-BASEL 2018. [DOI: 10.3390/fermentation4030058] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The effectiveness of polyhydroxyalkanoates (PHAs) production process from a waste stream is determined by the selection of a suitable mixed microbial culture (MMC). In this work, a feedstock from the paper industry, hardwood spent sulfite liquor (HSSL), supplemented with short-chain organic acids (SCOAs) to simulate a fermented effluent, was used as substrate to enrich a MMC in PHA-storing microorganisms. A stable culture was quickly established, and during the accumulation step the selected MMC reached a maximum PHA content of 34.6% (3HB:3HV-76:24). The bacterial community was analyzed through FISH analysis. Bacteria belonging to the four main classes were identified: Betaproteobacteria (44.7 ± 2.7%), Alphaproteobacteria (13.6 ± 1.3%) and Gammaproteobacteria (2.40 ± 1.1%) and Bacteroidetes (9.20 ± 3.8%). Inside the Betaproteobacteria class, Acidovorax (71%) was the dominant genus.
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18
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de Oliveira TS, Corsino SF, Di Trapani D, Torregrossa M, Viviani G. Biological minimization of excess sludge in a membrane bioreactor: Effect of plant configuration on sludge production, nutrient removal efficiency and membrane fouling tendency. BIORESOURCE TECHNOLOGY 2018; 259:146-155. [PMID: 29550667 DOI: 10.1016/j.biortech.2018.03.035] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2018] [Revised: 03/05/2018] [Accepted: 03/06/2018] [Indexed: 06/08/2023]
Abstract
Excess sludge minimization was studied in a MBR with pre-denitrification scheme. Sludge minimization, nitrogen removal performance and membrane fouling tendency were investigated in two configurations, characterized by a different position of the sludge retention reactor (SRR). In particular, the SRR was placed: i) in the return activated sludge line (Anaerobic Side-Stream Reactor - ASSR configuration) and ii) in the mainstream between the anoxic and aerobic reactor (Anaerobic Main-Stream Reactor - AMSR configuration). The achieved results demonstrated that the ASSR enabled a higher excess sludge reduction (74% vs 32%), while achieving lower biological nitrogen removal (BNR) (TN = 63% vs 78%) and membrane fouling tendency (FR = 2.1 · 1012 m-1 d-1vs 4.0 · 1011 m-1 d-1) than the AMSR. It was found that metabolism uncoupling, destruction of EPS and endogenous decay simultaneously occurred in the ASSR. Conversely, selective enrichment of bacteria population with low biomass yield was found the main mechanism affecting sludge minimization in the AMSR.
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Affiliation(s)
- Taissa Silva de Oliveira
- Dipartimento di Ingegneria Civile, Ambientale, Aerospaziale, dei Materiali, Università di Palermo, Viale delle Scienze, 90128 Palermo, Italy.
| | - Santo Fabio Corsino
- Dipartimento di Ingegneria Civile, Ambientale, Aerospaziale, dei Materiali, Università di Palermo, Viale delle Scienze, 90128 Palermo, Italy
| | - Daniele Di Trapani
- Dipartimento di Ingegneria Civile, Ambientale, Aerospaziale, dei Materiali, Università di Palermo, Viale delle Scienze, 90128 Palermo, Italy
| | - Michele Torregrossa
- Dipartimento di Ingegneria Civile, Ambientale, Aerospaziale, dei Materiali, Università di Palermo, Viale delle Scienze, 90128 Palermo, Italy
| | - Gaspare Viviani
- Dipartimento di Ingegneria Civile, Ambientale, Aerospaziale, dei Materiali, Università di Palermo, Viale delle Scienze, 90128 Palermo, Italy
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19
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Involvement of polyhydroxyalkanoates in stress resistance of microbial cells: Biotechnological consequences and applications. Biotechnol Adv 2018; 36:856-870. [DOI: 10.1016/j.biotechadv.2017.12.006] [Citation(s) in RCA: 122] [Impact Index Per Article: 20.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2017] [Revised: 11/24/2017] [Accepted: 12/12/2017] [Indexed: 01/30/2023]
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20
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Value-Added Products Derived from Waste Activated Sludge: A Biorefinery Perspective. WATER 2018. [DOI: 10.3390/w10050545] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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21
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Lee SH, Kim JH, Chung CW, Kim DY, Rhee YH. Analysis of Medium-Chain-Length Polyhydroxyalkanoate-Producing Bacteria in Activated Sludge Samples Enriched by Aerobic Periodic Feeding. MICROBIAL ECOLOGY 2018; 75:720-728. [PMID: 28993853 DOI: 10.1007/s00248-017-1084-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2016] [Accepted: 09/29/2017] [Indexed: 06/07/2023]
Abstract
Analysis of mixed microbial populations responsible for the production of medium-chain-length polyhydroxyalkanoates (MCL-PHAs) under periodic substrate feeding in a sequencing batch reactor (SBR) was conducted. Regardless of activated sludge samples and the different MCL alkanoic acids used as the sole external carbon substrate, denaturing gradient gel electrophoresis analysis indicated that Pseudomonas aeruginosa was the dominant bacterium enriched during the SBR process. Several P. aeruginosa strains were isolated from the enriched activated sludge samples. The isolates were subdivided into two groups, one that produced only MCL-PHAs and another that produced both MCL- and short-chain-length PHAs. The SBR periodic feeding experiments with five representative MCL-PHA-producing Pseudomonas species revealed that P. aeruginosa has an advantage over other species that enables it to become dominant in the bacterial community.
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Affiliation(s)
- Sun Hee Lee
- Department of Microbiology and Molecular Biology, Chungnam National University, Daejeon, 34134, Republic of Korea
| | - Jae Hee Kim
- Department of Microbiology and Molecular Biology, Chungnam National University, Daejeon, 34134, Republic of Korea
| | - Chung-Wook Chung
- Department of Biological Sciences, Andong National University, Andong, 36729, Republic of Korea
| | - Do Young Kim
- Industrial Bio-materials Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon, 34141, Republic of Korea
| | - Young Ha Rhee
- Department of Microbiology and Molecular Biology, Chungnam National University, Daejeon, 34134, Republic of Korea.
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22
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Highly complex substrates lead to dynamic bacterial community for polyhydroxyalkanoates production. ACTA ACUST UNITED AC 2017; 44:1215-1224. [DOI: 10.1007/s10295-017-1951-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2016] [Accepted: 05/05/2017] [Indexed: 01/03/2023]
Abstract
Abstract
Mixed microbial cultures (MMC) and waste/surplus substrates, as hardwood spent sulfite liquor, are being used to decrease polyhydroxyalkanoates’ (PHA) production costs. The process involves two or three steps, being the selection step a crucial one. For the industrial implementation of this strategy, reactor stability in terms of both performance and microbial community presence has to be considered. A long-term operation of a sequencing batch reactor under feast/famine conditions was performed along with microbial community identification/quantification using FISH and DGGE. The community was found to be extremely dynamic, dominated by Alphaproteobacteria, with Paracoccus and Rhodobacter present, both PHA-storing microorganisms. 16S rRNA gene clone library further revealed that side populations’ non-PHA accumulators were able to strive (Agrobacterium, Flavobacteria, and Brachymonas). Nevertheless, reactor performance in terms of PHA storage was stable during operation time. The monitoring of the MMC population evolution provided information on the relation between community structure and process operation.
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23
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Carbon recovery from wastewater through bioconversion into biodegradable polymers. N Biotechnol 2017; 37:9-23. [DOI: 10.1016/j.nbt.2016.05.007] [Citation(s) in RCA: 144] [Impact Index Per Article: 20.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2016] [Revised: 05/19/2016] [Accepted: 05/31/2016] [Indexed: 11/19/2022]
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24
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A process for polyhydroxyalkanoate (PHA) production from municipal wastewater treatment with biological carbon and nitrogen removal demonstrated at pilot-scale. N Biotechnol 2017; 35:42-53. [DOI: 10.1016/j.nbt.2016.11.005] [Citation(s) in RCA: 86] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2016] [Revised: 11/03/2016] [Accepted: 11/24/2016] [Indexed: 01/16/2023]
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25
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Mohandas S, Balan L, Lekshmi N, Cubelio S, Philip R, Bright Singh I. Production and characterization of polyhydroxybutyrate fromVibrio harveyiMCCB 284 utilizing glycerol as carbon source. J Appl Microbiol 2016; 122:698-707. [DOI: 10.1111/jam.13359] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2016] [Revised: 10/07/2016] [Accepted: 11/08/2016] [Indexed: 11/27/2022]
Affiliation(s)
- S.P. Mohandas
- National Centre for Aquatic Animal Health; Cochin University of Science and Technology; Kochi Kerala India
| | - L. Balan
- National Centre for Aquatic Animal Health; Cochin University of Science and Technology; Kochi Kerala India
| | - N. Lekshmi
- National Centre for Aquatic Animal Health; Cochin University of Science and Technology; Kochi Kerala India
| | - S.S. Cubelio
- Centre for Marine Living Resources and Ecology; Kakkanad Kochi Kerala India
| | - R. Philip
- Department of Marine Biology, Microbiology and Biochemistry; Cochin University of Science and Technology; Kochi Kerala India
| | - I.S. Bright Singh
- National Centre for Aquatic Animal Health; Cochin University of Science and Technology; Kochi Kerala India
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26
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The Enrichment of Microbial Community for Accumulating Polyhydroxyalkanoates Using Propionate-Rich Waste. Appl Biochem Biotechnol 2016; 182:755-768. [DOI: 10.1007/s12010-016-2359-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2016] [Accepted: 12/05/2016] [Indexed: 02/07/2023]
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27
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Unveiling PHA-storing populations using molecular methods. Appl Microbiol Biotechnol 2015; 99:10433-46. [DOI: 10.1007/s00253-015-7010-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2015] [Revised: 09/10/2015] [Accepted: 09/14/2015] [Indexed: 10/23/2022]
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28
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Morgan-Sagastume F, Hjort M, Cirne D, Gérardin F, Lacroix S, Gaval G, Karabegovic L, Alexandersson T, Johansson P, Karlsson A, Bengtsson S, Arcos-Hernández MV, Magnusson P, Werker A. Integrated production of polyhydroxyalkanoates (PHAs) with municipal wastewater and sludge treatment at pilot scale. BIORESOURCE TECHNOLOGY 2015; 181:78-89. [PMID: 25638407 DOI: 10.1016/j.biortech.2015.01.046] [Citation(s) in RCA: 100] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2014] [Revised: 01/08/2015] [Accepted: 01/09/2015] [Indexed: 05/11/2023]
Abstract
A pilot-scale process was operated over 22 months at the Brussels North Wastewater Treatment Plant (WWTP) in order to evaluate polyhydroxyalkanoate (PHA) production integration with services of municipal wastewater and sludge management. Activated sludge was produced with PHA accumulation potential (PAP) by applying feast-famine selection while treating the readily biodegradable COD from influent wastewater (average removals of 70% COD, 60% CODsol, 24% nitrogen, and 46% phosphorus). The biomass PAP was evaluated to be in excess of 0.4gPHA/gVSS. Batch fermentation of full-scale WWTP sludge at selected temperatures (35, 42 and 55 °C) produced centrate (6-9.4 gCODVFA/L) of consistent VFA composition, with optimal fermentation performance at 42 °C. Centrate was used to accumulate PHA up to 0.39 gPHA/gVSS. The centrate nutrients are a challenge to the accumulation process but producing a biomass with 0.5 gPHA/gVSS is considered to be realistically achievable within the typically available carbon flows at municipal waste management facilities.
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Affiliation(s)
- F Morgan-Sagastume
- AnoxKaldnes, Veolia Water Technologies, Klosterängsvägen 11A, 226 47 Lund, Sweden.
| | - M Hjort
- AnoxKaldnes, Veolia Water Technologies, Klosterängsvägen 11A, 226 47 Lund, Sweden
| | - D Cirne
- Dept. of Biotechnology and Biosystems, Veolia Recherche et Innovation (VERI) - Centre de Recherche de Maisons Laffitte, Chemin de la Digue - BP 76, 78603 Maisons-Laffitte, France
| | - F Gérardin
- Dept. of Biotechnology and Biosystems, Veolia Recherche et Innovation (VERI) - Centre de Recherche de Maisons Laffitte, Chemin de la Digue - BP 76, 78603 Maisons-Laffitte, France
| | - S Lacroix
- Dept. of Biotechnology and Biosystems, Veolia Recherche et Innovation (VERI) - Centre de Recherche de Maisons Laffitte, Chemin de la Digue - BP 76, 78603 Maisons-Laffitte, France
| | - G Gaval
- Dept. of Biotechnology and Biosystems, Veolia Recherche et Innovation (VERI) - Centre de Recherche de Maisons Laffitte, Chemin de la Digue - BP 76, 78603 Maisons-Laffitte, France
| | - L Karabegovic
- AnoxKaldnes, Veolia Water Technologies, Klosterängsvägen 11A, 226 47 Lund, Sweden
| | - T Alexandersson
- AnoxKaldnes, Veolia Water Technologies, Klosterängsvägen 11A, 226 47 Lund, Sweden
| | - P Johansson
- AnoxKaldnes, Veolia Water Technologies, Klosterängsvägen 11A, 226 47 Lund, Sweden
| | - A Karlsson
- AnoxKaldnes, Veolia Water Technologies, Klosterängsvägen 11A, 226 47 Lund, Sweden
| | - S Bengtsson
- AnoxKaldnes, Veolia Water Technologies, Klosterängsvägen 11A, 226 47 Lund, Sweden
| | - M V Arcos-Hernández
- AnoxKaldnes, Veolia Water Technologies, Klosterängsvägen 11A, 226 47 Lund, Sweden
| | - P Magnusson
- AnoxKaldnes, Veolia Water Technologies, Klosterängsvägen 11A, 226 47 Lund, Sweden
| | - A Werker
- AnoxKaldnes, Veolia Water Technologies, Klosterängsvägen 11A, 226 47 Lund, Sweden
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