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Vu DH, Mahboubi A, Root A, Heinmaa I, Taherzadeh MJ, Åkesson D. Application of Immersed Membrane Bioreactor for Semi-Continuous Production of Polyhydroxyalkanoates from Organic Waste-Based Volatile Fatty Acids. MEMBRANES 2023; 13:569. [PMID: 37367773 DOI: 10.3390/membranes13060569] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2023] [Revised: 05/23/2023] [Accepted: 05/29/2023] [Indexed: 06/28/2023]
Abstract
Volatile fatty acids (VFAs) appear to be an economical carbon feedstock for the cost-effective production of polyhydroxyalkanoates (PHAs). The use of VFAs, however, could impose a drawback of substrate inhibition at high concentrations, resulting in low microbial PHA productivity in batch cultivations. In this regard, retaining high cell density using immersed membrane bioreactor (iMBR) in a (semi-) continuous process could enhance production yields. In this study, an iMBR with a flat-sheet membrane was applied for semi-continuous cultivation and recovery of Cupriavidus necator in a bench-scale bioreactor using VFAs as the sole carbon source. The cultivation was prolonged up to 128 h under an interval feed of 5 g/L VFAs at a dilution rate of 0.15 (d-1), yielding a maximum biomass and PHA production of 6.6 and 2.8 g/L, respectively. Potato liquor and apple pomace-based VFAs with a total concentration of 8.8 g/L were also successfully used in the iMBR, rendering the highest PHA content of 1.3 g/L after 128 h of cultivation. The PHAs obtained from both synthetic and real VFA effluents were affirmed to be poly(3-hydroxybutyrate-co-3-hydroxyvalerate) with a crystallinity degree of 23.8 and 9.6%, respectively. The application of iMBR could open an opportunity for semi-continuous production of PHA, increasing the feasibility of upscaling PHA production using waste-based VFAs.
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Affiliation(s)
- Danh H Vu
- Swedish Centre for Resource Recovery, University of Borås, 501 90 Borås, Sweden
| | - Amir Mahboubi
- Swedish Centre for Resource Recovery, University of Borås, 501 90 Borås, Sweden
| | - Andrew Root
- MagSol, Tuhkanummenkuja 2, 00970 Helsinki, Finland
| | - Ivo Heinmaa
- National Institute of Chemical Physics and Biophysics, 12618 Tallinn, Estonia
| | | | - Dan Åkesson
- Swedish Centre for Resource Recovery, University of Borås, 501 90 Borås, Sweden
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Production efficiency and properties of poly(3hydroxybutyrate-co-3hydroxyvalerate) generated via a robust bacterial consortium dominated by Zoogloea sp. using acidified discarded fruit juices as carbon source. Int J Biol Macromol 2023; 226:1500-1514. [PMID: 36511266 DOI: 10.1016/j.ijbiomac.2022.11.262] [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: 10/21/2022] [Revised: 11/23/2022] [Accepted: 11/24/2022] [Indexed: 11/27/2022]
Abstract
In the current study, a mixed microbial culture (MMC) of polyhydroxyalkanoates (PHAs) producers was developed under nutrient stress and was assessed as biocatalyst for the production of high-yielding PHAs from fermented (acidified) discarded fruit juices (DFJ). The structure of the MMC was analyzed periodically to determine its microbial dynamics, revealing that Zoogloae sp. dominated throughout the operation of the system. The efficiency of PHAs production from the MMC was further optimized in batch mode by altering the ratio of C to N, the ratio of carbon sources (propionate and butyrate), and the initial pH, and subsequently different fermentation mixtures of acidified DFJ were assessed as substrates at optimal conditions. Upon solvent extraction, the properties of recovered PHAs were analyzed, showing that in all cases P(3HB-co-3HV) was produced, with Tm ranging from 90.5 to 168.8 °C, and maximum obtained yields 54.61 ± 4.31 % and 43.27 ± 2.13 %, from synthetic substrates and DFJ, respectively. Overall, it was shown that the developed MMC can be efficiently applied as biocatalyst for the exploitation of sugary wastewaters, such as DFJ, towards bio-based and biodegradable plastics bearing the required properties to substitute fossil plastics, into the concept of a circular economy.
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Hathi ZJ, Haque MA, Priya A, Qin ZH, Huang S, Lam CH, Ladakis D, Pateraki C, Mettu S, Koutinas A, Du C, Lin CSK. Fermentative bioconversion of food waste into biopolymer poly(3-hydroxybutyrate-co-3-hydroxyvalerate) using Cupriavidus necator. ENVIRONMENTAL RESEARCH 2022; 215:114323. [PMID: 36115419 DOI: 10.1016/j.envres.2022.114323] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2022] [Revised: 08/20/2022] [Accepted: 09/07/2022] [Indexed: 05/27/2023]
Abstract
Dependency on plastic commodities has led to a recurrent increase in their global production every year. Conventionally, plastic products are derived from fossil fuels, leading to severe environmental concerns. The recent coronavirus disease 2019 pandemic has triggered an increase in medical waste. Conversely, it has disrupted the supply chain of personal protective equipment (PPE). Valorisation of food waste was performed to cultivate C. necator for fermentative production of biopolymer poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV). The increase in biomass, PHBV yield and molar 3-hydroxy valerate (3HV) content was estimated after feeding volatile fatty acids. The fed-batch fermentation strategy reported in this study produced 15.65 ± 0.14 g/L of biomass with 5.32 g/L of PHBV with 50% molar 3HV content. This is a crucial finding, as molar concentration of 3HV can be modulated to suit the specification of biopolymer (film or fabric). The strategy applied in this study addresses the issue of global food waste burden and subsequently generates biopolymer PHBV, turning waste to wealth.
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Affiliation(s)
- Zubeen J Hathi
- School of Energy and Environment, City University of Hong Kong, Tat Chee Ave, Kowloon, Hong Kong
| | - Md Ariful Haque
- School of Energy and Environment, City University of Hong Kong, Tat Chee Ave, Kowloon, Hong Kong
| | - Anshu Priya
- School of Energy and Environment, City University of Hong Kong, Tat Chee Ave, Kowloon, Hong Kong
| | - Zi-Hao Qin
- School of Energy and Environment, City University of Hong Kong, Tat Chee Ave, Kowloon, Hong Kong
| | - Shuquan Huang
- School of Energy and Environment, City University of Hong Kong, Tat Chee Ave, Kowloon, Hong Kong
| | - Chun Ho Lam
- School of Energy and Environment, City University of Hong Kong, Tat Chee Ave, Kowloon, Hong Kong
| | - Dimitris Ladakis
- Department of Food Science and Human Nutrition, Agricultural University of Athens, Athens, Greece
| | - Chrysanthi Pateraki
- Department of Food Science and Human Nutrition, Agricultural University of Athens, Athens, Greece
| | - Srinivas Mettu
- Chemical and Environmental Engineering, School of Engineering, RMIT University, Melbourne, Victoria, 3000, Australia
| | - Apostolis Koutinas
- Department of Food Science and Human Nutrition, Agricultural University of Athens, Athens, Greece
| | - Chenyu Du
- School of Applied Sciences, University of Huddersfield, Huddersfield, HD1 3DH, United Kingdom
| | - Carol Sze Ki Lin
- School of Energy and Environment, City University of Hong Kong, Tat Chee Ave, Kowloon, Hong Kong.
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Saratale RG, Cho SK, Kadam AA, Ghodake GS, Kumar M, Bharagava RN, Varjani S, Nair S, Kim DS, Shin HS, Saratale GD. Developing Microbial Co-Culture System for Enhanced Polyhydroxyalkanoates (PHA) Production Using Acid Pretreated Lignocellulosic Biomass. Polymers (Basel) 2022; 14:polym14040726. [PMID: 35215639 PMCID: PMC8876045 DOI: 10.3390/polym14040726] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2022] [Revised: 02/09/2022] [Accepted: 02/11/2022] [Indexed: 12/10/2022] Open
Abstract
In the growing polymer industry, the interest of researchers is captivated by bioplastics production with biodegradable and biocompatible properties. This study examines the polyhydroxyalkanoates (PHA) production performance of individual Lysinibacillus sp. RGS and Ralstonia eutropha ATCC 17699 and their co-culture by utilizing sugarcane bagasse (SCB) hydrolysates. Initially, acidic (H2SO4) and acidified sodium chlorite pretreatment was employed for the hydrolysis of SCB. The effects of chemical pretreatment on the SCB biomass assembly and its chemical constituents were studied by employing numerous analytical methods. Acidic pretreatment under optimal conditions showed effective delignification (60%) of the SCB biomass, leading to a maximum hydrolysis yield of 74.9 ± 1.65% and a saccharification yield of 569.0 ± 5.65 mg/g of SCB after enzymatic hydrolysis. The resulting SCB enzymatic hydrolysates were harnessed for PHA synthesis using individual microbial culture and their defined co-culture. Co-culture strategy was found to be effective in sugar assimilation, bacterial growth, and PHA production kinetic parameters relative to the individual strains. Furthermore, the effects of increasing acid pretreated SCB hydrolysates (20, 30, and 40 g/L) on cell density and PHA synthesis were studied. The effects of different cost-effective nutrient supplements and volatile fatty acids (VFAs) with acid pretreated SCB hydrolysates on cell growth and PHA production were studied. By employing optimal conditions and supplementation of corn steep liquor (CSL) and spent coffee waste extracted oil (SCGO), the co-culture produced maximum cell growth (DCW: 11.68 and 11.0 g/L), PHA accumulation (76% and 76%), and PHA titer (8.87 and 8.36 g/L), respectively. The findings collectively suggest that the development of a microbial co-culture strategy is a promising route for the efficient production of high-value bioplastics using different agricultural waste biomass.
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Affiliation(s)
- Rijuta Ganesh Saratale
- Research Institute of Biotechnology and Medical Converged Science, Dongguk University-Seoul, Ilsandong-gu, Goyang-si 10326, Gyeonggi-do, Korea; (R.G.S.); (A.A.K.)
| | - Si-Kyung Cho
- Department of Biological and Environmental Science, Dongguk University, Ilsandong-gu, Goyang-si 10326, Gyonggi-do, Korea; (S.-K.C.); (G.S.G.)
| | - Avinash Ashok Kadam
- Research Institute of Biotechnology and Medical Converged Science, Dongguk University-Seoul, Ilsandong-gu, Goyang-si 10326, Gyeonggi-do, Korea; (R.G.S.); (A.A.K.)
| | - Gajanan Sampatrao Ghodake
- Department of Biological and Environmental Science, Dongguk University, Ilsandong-gu, Goyang-si 10326, Gyonggi-do, Korea; (S.-K.C.); (G.S.G.)
| | - Manu Kumar
- Department of Life Science, Dongguk University-Seoul, 32 Dongguk-ro, Ilsandong-gu, Goyang-si 10326, Gyeonggi-do, Korea;
| | - Ram Naresh Bharagava
- Department of Environmental Microbiology, School for Environmental Sciences Babasaheb Bhimrao Ambedkar University (A Central University), Lucknow 226 025, Uttar Pradesh, India;
| | - Sunita Varjani
- Gujarat Pollution Control Board, Gandhinagar 382 010, Gujarat, India;
| | - Supriya Nair
- Department of Research and Development, SRL Limited, Prime Square, S. V. Road, Goregaon (W), Mumbai 400 062, Maharashtra State, India;
| | - Dong-Su Kim
- Department of Environmental Science and Engineering, Ewha Womans University, Seoul 120-750, Korea;
| | - Han-Seung Shin
- Department of Food Science and Biotechnology, Dongguk University-Seoul, Ilsandong-gu, Goyang-si 10326, Gyeonggi-do, Korea;
| | - Ganesh Dattatraya Saratale
- Department of Food Science and Biotechnology, Dongguk University-Seoul, Ilsandong-gu, Goyang-si 10326, Gyeonggi-do, Korea;
- Correspondence:
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Kakkalameli S, Daphedar AB, Faniband B, Sharma S, Nadda AK, Ferreira LFR, Bilal M, Américo-Pinheiro JHP, Mulla SI. Biopolymers and Environment. Biopolymers 2022. [DOI: 10.1007/978-3-030-98392-5_2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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