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Wu Y, Hu W, Zheng X, Liu Y, Niu Q, Chen Y. Valorization of food waste into short-chain fatty acids via enzymatic pretreatment: Effects of fermentation-pH on acid-producing processes and microbial metabolic functions. WASTE MANAGEMENT (NEW YORK, N.Y.) 2023; 167:22-30. [PMID: 37236002 DOI: 10.1016/j.wasman.2023.05.016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/31/2022] [Revised: 04/26/2023] [Accepted: 05/08/2023] [Indexed: 05/28/2023]
Abstract
Food waste (FW) has been widely considered as an essential resource for the production of short-chain fatty acids (SCFAs), an important class of chemicals with wide applications and over 20 million tons of annual market demand, by anaerobic fermentation. Although enzymatic pre-treatment could improve the FW biodegradation efficiency, resulting in enhanced efficiency of solubilization and hydrolysis, the influence of fermentation-pH on the SCFAs production and the metabolic functions, have rarely been reported. This study demonstrated that the uncontrolled pH could efficiently lead to an increase in the SCFAs production (33011 mgCOD/L) during long-term fermentation of FW (mainly consisting of 48.8% carbohydrates, 20.6% proteins, and 17.4% lipids) after enzymatic pre-treatment compared to the control (16413 mgCOD/L). Meanwhile, the acid-producing processes (i.e., solubilization, hydrolysis, and acidification) were synchronously enhanced by the enzymatic pre-treatment and no control over fermentation-pH. Metagenomic analysis revealed that the acid-forming microorganisms (i.e., Olsenella sp. and Sporanaerobacter) were significantly accumulated, and the corresponding genetic expressions related to extracellular hydrolysis (i.e., aspB and gltB), membrane transport (i.e., metL and glnH), and intracellular material metabolism (i.e., pfkA and ackA) were evidently stimulated, thereby promoting ultimate SCFAs generation. Although the alkaline conditions could further slightly increase the SCFAs yield slightly (37100 mgCOD/L) and also stimulate the metabolic activities, it might not be suitable for large-scale practical applications due to additional costs associated with alkaline chemical additives.
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Affiliation(s)
- Yang Wu
- State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China
| | - Wanying Hu
- State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China
| | - Xiong Zheng
- State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China.
| | - Yiwei Liu
- State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China
| | - Qiuqi Niu
- State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China
| | - Yinguang Chen
- State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China
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Kumar V, Vangnai AS, Sharma N, Kaur K, Chakraborty P, Umesh M, Singhal B, Utreja D, Carrasco EU, Andler R, Awasthi MK, Taherzadeh MJ. Bioengineering of biowaste to recover bioproducts and bioenergy: A circular economy approach towards sustainable zero-waste environment. CHEMOSPHERE 2023; 319:138005. [PMID: 36731660 DOI: 10.1016/j.chemosphere.2023.138005] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/2022] [Revised: 01/11/2023] [Accepted: 01/27/2023] [Indexed: 06/18/2023]
Abstract
The inevitable need for waste valorisation and management has revolutionized the way in which the waste is visualised as a potential biorefinery for various product development rather than offensive trash. Biowaste has emerged as a potential feedstock to produce several value-added products. Bioenergy generation is one of the potential applications originating from the valorisation of biowaste. Bioenergy production requires analysis and optimization of various parameters such as biowaste composition and conversion potential to develop innovative and sustainable technologies for most effective utilization of biowaste with enhanced bioenergy production. In this context, feedstocks, such as food, agriculture, beverage, and municipal solid waste act as promising resources to produce renewable energy. Similarly, the concept of microbial fuel cells employing biowaste has clearly gained research focus in the past few decades. Despite of these potential benefits, the area of bioenergy generation still is in infancy and requires more interdisciplinary research to be sustainable alternatives. This review is aimed at analysing the bioconversion potential of biowaste to renewable energy. The possibility of valorising underutilized biowaste substrates is elaborately presented. In addition, the application and efficiency of microbial fuel cells in utilizing biowaste are described in detail taking into consideration of its great scope. Furthermore, the review addresses the significance bioreactor development for energy production along with major challenges and future prospects in bioenergy production. Based on this review it can be concluded that bioenergy production utilizing biowaste can clearly open new avenues in the field of waste valorisation and energy research. Systematic and strategic developments considering the techno economic feasibilities of this excellent energy generation process will make them a true sustainable alternative for conventional energy sources.
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Affiliation(s)
- Vinay Kumar
- Ecotoxicity and Bioconversion Laboratory, Department of Community Medicine, Saveetha Medical College and Hospital, Saveetha Institute of Medical and Technical Sciences (SIMATS), Chennai, Thandalam, 602105, India.
| | - Alisa S Vangnai
- Center of Excellence in Biocatalyst and Sustainable Biotechnology, Department of Biochemistry, Faculty of Science, Chulalongkorn University, Bangkok, 10330, Thailand
| | - Neha Sharma
- Metagenomics and Bioprocess Design Laboratory, School of Biotechnology, Jawaharlal Nehru University, New Delhi, India
| | - Komalpreet Kaur
- Department of Chemistry, Punjab Agricultural University, Ludhiana, Punjab, 141004, India
| | - Pritha Chakraborty
- School of Allied Healthcare and Sciences, Jain (Deemed to Be) University, Whitefield, Bangalore-66, India
| | - Mridul Umesh
- Department of Life Sciences, CHRIST (Deemed to be University), Hosur Road, Bengaluru, 560029, Karnataka, India
| | - Barkha Singhal
- School of Biotechnology, Gautam Buddha University, Greater Noida, U.P., India
| | - Divya Utreja
- Department of Chemistry, Punjab Agricultural University, Ludhiana, Punjab, 141004, India
| | | | - Rodrigo Andler
- Escuela de Ingeniería en Biotecnología, Centro de Biotecnología de Los Recursos Naturales (Cenbio), Universidad Católica Del Maule, Chile
| | - Mukesh Kumar Awasthi
- College of Natural Resources and Environment, Northwest A&F University, Yangling, 712100, PR China
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Microbial Behavior and Influencing Factors in the Anaerobic Digestion of Distiller: A Comprehensive Review. FERMENTATION-BASEL 2023. [DOI: 10.3390/fermentation9030199] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/24/2023]
Abstract
Anaerobic digestion technology is regarded as the most ideal technology for the treatment of a distiller in terms of environmental protection, resource utilization, and cost. However, there are some limitations to this process, the most prominent of which is microbial activity. The purpose of this paper is to provide a critical review of the microorganisms involved in the anaerobic digestion process of a distiller, with emphasis on the archaea community. The effects of operating parameters on microbial activity and process, such as pH, temperature, TAN, etc., are discussed. By understanding the activity of microorganisms, the anaerobic treatment technology of a distiller can be more mature. Aiming at the problem that anaerobic treatment of a distiller alone is not effective, the synergistic effect of different substrates is briefly discussed. In addition, the recent literature on the use of microorganisms to purify a distiller was collected in order to better purify the distiller and reduce harm. In the future, more studies are needed to elucidate the interactions between microorganisms and establish the mechanisms of microbial interactions in different environments.
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Siqueira JCD, Assemany P, Siniscalchi LAB. Microbial dynamics and methanogenic potential of co-digestion of sugarcane vinasse and dairy secondary effluent in an upflow anaerobic sludge blanket reactor. BIORESOURCE TECHNOLOGY 2022; 361:127654. [PMID: 35868464 DOI: 10.1016/j.biortech.2022.127654] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2022] [Revised: 07/14/2022] [Accepted: 07/15/2022] [Indexed: 05/25/2023]
Abstract
Co-digestion is a strategy that may prevent microbial inhibition during the anaerobic treatment of sugarcane vinasse, a substrate with highly biodegradable organic load, acidity, and toxic compound levels (e.g., sulfates, phenols). In this context, this study evaluated the microbial dynamics and methanogenic potential throughout the co-digestion of sugarcane vinasse and secondary effluent from the dairy industry in a mesophilic lab-scale upflow anaerobic sludge blanket (UASB) reactor. Periodic next-generation sequencing (NGS) analyses revealed an increase in the relative abundance of the phylum Euryarchaeota (+8.6 % after inoculation), predominating hydrogenotrophic methanogens (Methanobacterium and Methanobrevibacter) at the end of the operation. Moreover, the average methane yield was 221 mLCH4 gCODrem-1, with 69 % of organic matter removal. These results evidenced a progressive acclimation of the anaerobic microbial community to the substrate and a stable operation. Therefore, the proposed experiment demonstrates energy advantages for the agro-industrial sector by implementing a similar but full-scale treatment plant.
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Affiliation(s)
- Juliano Curi de Siqueira
- Department of Environmental Engineering, Federal University of Lavras (Universidade Federal de Lavras, UFLA), Lavras, Minas Gerais, Brazil.
| | - Paula Assemany
- Department of Environmental Engineering, Federal University of Lavras (Universidade Federal de Lavras, UFLA), Lavras, Minas Gerais, Brazil.
| | - Luciene Alves Batista Siniscalchi
- Department of Environmental Engineering, Federal University of Lavras (Universidade Federal de Lavras, UFLA), Lavras, Minas Gerais, Brazil.
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Borges ADV, Fuess LT, Takeda PY, Alves I, Dias MES, Damianovic MHRZ. Co-digestion of biofuel by-products: Enhanced biofilm formation maintains high organic matter removal when methanogenesis fails. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2022; 310:114768. [PMID: 35220101 DOI: 10.1016/j.jenvman.2022.114768] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/15/2021] [Revised: 02/16/2022] [Accepted: 02/17/2022] [Indexed: 06/14/2023]
Abstract
Ethanol and biodiesel industries generate large volumes of by-products, such as vinasse and glycerol, which are suitable for biogas exploitation. This paper assessed the applicability and process performance of the anaerobic structured-bed reactor (AnSTBR) for the mesophilic (30 °C) continuous (105 days) anaerobic co-digestion of sugarcane vinasse and distilled glycerol under increasing organic loading rates (OLR) (0.5-5.0 kgCOD m-3d-1). The highest methane yield (211 NmL g-1CODrem.) and volumetric production (668 NmL L-1d-1) occurred at an OLR of 3.5 kgCOD m-3d-1. The performance of the AnSTBR showed high removal efficiencies of total COD (77.1%), carbohydrates (81.9%), and glycerol content (99.7%). Biofilm growth enhancement within the reactor offset the impairment of methanogenesis activity at high organic loads. The prompt biodegradability of glycerol reinforced the importance of gradually increase the organic load to prevent the buildup of volatile acids and maintain a stable long-term co-digestion system.
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Affiliation(s)
- André do Vale Borges
- Biological Processes Laboratory (LPB), São Carlos School of Engineering (EESC), University of São Paulo (USP), Av. João Dagnone, 1100, Santa Angelina, São Carlos, São Paulo, 13563-120, Brazil.
| | - Lucas Tadeu Fuess
- Biological Processes Laboratory (LPB), São Carlos School of Engineering (EESC), University of São Paulo (USP), Av. João Dagnone, 1100, Santa Angelina, São Carlos, São Paulo, 13563-120, Brazil
| | - Paula Yumi Takeda
- Biological Processes Laboratory (LPB), São Carlos School of Engineering (EESC), University of São Paulo (USP), Av. João Dagnone, 1100, Santa Angelina, São Carlos, São Paulo, 13563-120, Brazil
| | - Inaê Alves
- Biological Processes Laboratory (LPB), São Carlos School of Engineering (EESC), University of São Paulo (USP), Av. João Dagnone, 1100, Santa Angelina, São Carlos, São Paulo, 13563-120, Brazil
| | - Maria Eduarda Simões Dias
- Biological Processes Laboratory (LPB), São Carlos School of Engineering (EESC), University of São Paulo (USP), Av. João Dagnone, 1100, Santa Angelina, São Carlos, São Paulo, 13563-120, Brazil
| | - Márcia Helena Rissato Zamariolli Damianovic
- Biological Processes Laboratory (LPB), São Carlos School of Engineering (EESC), University of São Paulo (USP), Av. João Dagnone, 1100, Santa Angelina, São Carlos, São Paulo, 13563-120, Brazil
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6
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Gómez-Quiroga X, Aboudi K, Álvarez-Gallego CJ, Romero-García LI. Successful and stable operation of anaerobic thermophilic co-digestion of sun-dried sugar beet pulp and cow manure under short hydraulic retention time. CHEMOSPHERE 2022; 293:133484. [PMID: 34990719 DOI: 10.1016/j.chemosphere.2021.133484] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2021] [Revised: 12/02/2021] [Accepted: 12/29/2021] [Indexed: 06/14/2023]
Abstract
This work consists of a long-term (621 days) experimental study about biogas production from sun dried sugar beet pulp and cow manure. Thermophilic (55 °C) anaerobic co-digestion was performed in semi-continuous reactors, testing ten hydraulic retention times (30-3 days) (HRTs) and organic loading rates (2-24 gVS/Lreactor∙d) (OLRs). Results showed that the best global system performance (regarding stability, biogas production, and organic matter removal) was achieved at an HRT as short as 5 days (OLR of 12.47 gVS/Lreactor∙d) with a biogas yield of 315 mL/gVSadded. The gradual OLR increase allowed system control and time-appropriate intervention, avoiding irreversible process disturbances and maintaining admissible acidity/alkalinity ratios (<0.8) for HRTs ranging from 30 to 4 days. The accumulation of acetic acid was the main cause of the process disturbance observed at short HRTs. It was deduced that for the HRT of 3 days, the methane productivity was mainly owing to the hydrogen-utilizing methanogens pathway. This research clearly shows how an adequate combination of agro-industrial wastes and livestock manure could be processed by anaerobic co-digestion in short HRTs with great efficiency and stability and deepens in the understanding of the start-up, stability and optimization of the co-digestion.
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Affiliation(s)
- Xiomara Gómez-Quiroga
- Department of Chemical Engineering and Food Technology, Faculty of Science, University of Cádiz - International Campus of Excellence (ceiA3), P.O. Box No 40, 11510, Puerto Real, Cádiz, Spain
| | - Kaoutar Aboudi
- Department of Chemical Engineering and Food Technology, Faculty of Science, University of Cádiz - International Campus of Excellence (ceiA3), P.O. Box No 40, 11510, Puerto Real, Cádiz, Spain
| | - Carlos José Álvarez-Gallego
- Department of Chemical Engineering and Food Technology, Faculty of Science, University of Cádiz - International Campus of Excellence (ceiA3), P.O. Box No 40, 11510, Puerto Real, Cádiz, Spain.
| | - Luis Isidoro Romero-García
- Department of Chemical Engineering and Food Technology, Faculty of Science, University of Cádiz - International Campus of Excellence (ceiA3), P.O. Box No 40, 11510, Puerto Real, Cádiz, Spain
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7
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Cheng HH, Whang LM. Resource recovery from lignocellulosic wastes via biological technologies: Advancements and prospects. BIORESOURCE TECHNOLOGY 2022; 343:126097. [PMID: 34626758 DOI: 10.1016/j.biortech.2021.126097] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2021] [Revised: 10/04/2021] [Accepted: 10/05/2021] [Indexed: 06/13/2023]
Abstract
Lignocellulosic wastes were recently considered as biomass resources, however, its conversion to valuable products is still immature although researchers have put lots of effort into this issue. This article reviews the key challenges of the biorefinery utilizing lignocellulosic materials and recent developments to conquer those obstacles. Available biological techniques and processes, from the pretreatments of cellulosic materials to the valorization processes, were emphasized. Biological pretreatments, including hydrolysis using microbial consortia, fungi, enzymes, engineered bacterial/fungal strains, and co-culture systems, could enhance the release of reducing sugar. Resources recovery, including biogases, ethanol, butanol, PHA, etc., from lignocellulosic materials were also discussed, while the influences of composition of lignocellulosic materials and pretreatment options, applications of co-culture system, and integrated treatments with other wastes, were described. In the review, co-culture system and metabolic engineering are emphasized as the promising biological technologies, while perspectives are provided for their future developments.
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Affiliation(s)
- Hai-Hsuan Cheng
- Department of Environmental Engineering, National Cheng Kung University, No. 1, University Road, Tainan 701, Taiwan
| | - Liang-Ming Whang
- Department of Environmental Engineering, National Cheng Kung University, No. 1, University Road, Tainan 701, Taiwan; Sustainable Environment Research Laboratory (SERL), National Cheng Kung University, No. 1, University Road, Tainan 701, Taiwan.
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8
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El-Ramady H, Brevik EC, Elbasiouny H, Elbehiry F, Amer M, Elsakhawy T, Omara AED, Mosa AA, El-Ghamry AM, Abdalla N, Rezes S, Elboraey M, Ezzat A, Eid Y. Planning for disposal of COVID-19 pandemic wastes in developing countries: a review of current challenges. ENVIRONMENTAL MONITORING AND ASSESSMENT 2021; 193:592. [PMID: 34424421 PMCID: PMC8380865 DOI: 10.1007/s10661-021-09350-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2021] [Accepted: 07/30/2021] [Indexed: 05/18/2023]
Abstract
The health sector is critical to the well-being of any country, but developing countries have several obstacles that prevent them from providing adequate health care. This became an even larger concern after the COVID-19 outbreak left millions of people dead worldwide and generated huge amounts of infected or potentially infected wastes. The management and disposal of medical wastes during and post-COVID-19 represent a major challenge in all countries, but this challenge is particularly great for developing countries that do not have robust waste disposal infrastructure. The main problems in developing countries include inefficient treatment procedures, limited capacity of healthcare facilities, and improper waste disposal procedures. The management of medical wastes in most developing countries was primitive prior to the pandemic. The improper treatment and disposal of these wastes in our current situation may further speed COVID-19 spread, creating a serious risk for workers in the medical and sanitation fields, patients, and all of society. Therefore, there is a critical need to discuss emerging challenges in handling, treating, and disposing of medical wastes in developing countries during and after the COVID-19 outbreak. There is a need to determine best disposal techniques given the conditions and limitations under which developing countries operate. Several open questions need to be investigated concerning this global issue, such as to what extent developing countries can control the expected environmental impacts of COVID-19, particularly those related to medical wastes? What are the projected management scenarios for medical wastes under the COVID-19 outbreak? And what are the major environmental risks posed by contaminated wastes related to COVID-19 treatment? Studies directed at the questions above, careful planning, the use of large capacity mobile recycling facilities, and following established guidelines for disposal of medical wastes should reduce risk of COVID-19 spread in developing countries.
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Affiliation(s)
- Hassan El-Ramady
- Soil and Water Dept, Faculty of Agriculture, Kafrelsheikh University, Kafr El-Sheikh, 33516 Egypt
| | - Eric C. Brevik
- College of Agricultural, Life, and Physical Sciences, Southern Illinois University, Carbondale, IL USA
| | - Heba Elbasiouny
- Department of Environmental and Biological Sciences, Home Economy Faculty, Al-Azhar University, Tanta, 31732 Egypt
| | - Fathy Elbehiry
- Central Laboratory of Environmental Studies, Kafrelsheikh University, Kafr El-Sheikh, 33516 Egypt
| | - Megahed Amer
- Soils Improvement Dept., Soils, Water and Environment Research Institute, Sakha Station, Agricultural Research Center, Kafr El-Sheikh, 33717 Egypt
| | - Tamer Elsakhawy
- Agriculture Microbiology Department, Soil, Water and Environment Research Institute (SWERI), Agriculture Research Center, Sakha Agricultural Research Station, Kafr El-Sheikh, 33717 Egypt
| | - Alaa El-Dein Omara
- Agriculture Microbiology Department, Soil, Water and Environment Research Institute (SWERI), Agriculture Research Center, Sakha Agricultural Research Station, Kafr El-Sheikh, 33717 Egypt
| | - Ahmed A. Mosa
- Soils Department, Faculty of Agriculture, Mansoura University, Mansoura, 35516 Egypt
| | - Ayman M. El-Ghamry
- Soils Department, Faculty of Agriculture, Mansoura University, Mansoura, 35516 Egypt
| | - Neama Abdalla
- Plant Biotechnology Dept, , Genetic Engineering & Biotechnology Research Div, National Research Centre, Cairo, 12622 Egypt
| | - Szilárd Rezes
- Division of Oto-Rhyno-Laryngology, Medical and Health Science Center, Debrecen University, 4032 Debrecen, Hungary
| | - Mai Elboraey
- Division of Oto-Rhyno-Laryngology, Medical and Health Science Center, Debrecen University, 4032 Debrecen, Hungary
| | - Ahmed Ezzat
- Horticulture Dept, Faculty of Agriculture, Kafrelsheikh University, Kafr El-Sheikh, 33516 Egypt
| | - Yahya Eid
- Poultry Dept, Faculty of Agriculture, Kafrelsheikh University, Kafr El-Sheikh, 33516 Egypt
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Dong L, Wu Y, Bian Y, Zheng X, Chen L, Chen Y, Zhang X. Carbon nanotubes mitigate copper-oxide nanoparticles-induced inhibition to acidogenic metabolism of Propionibacterium acidipropionici by regulating carbon source utilization. BIORESOURCE TECHNOLOGY 2021; 330:125003. [PMID: 33770734 DOI: 10.1016/j.biortech.2021.125003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2021] [Revised: 03/10/2021] [Accepted: 03/11/2021] [Indexed: 06/12/2023]
Abstract
This study demonstrated that multi-walled carbon nanotubes (MWCNTs) could mitigate copper oxide nanoparticles (CuO NPs)-induced inhibition to acidogenic metabolism of propionic acid bacteria (i.e., Propionibacterium acidipropionici) by regulating carbon source utilization. CuO NPs severely inhibited the growth of P. acidipropionici, damaged its cell membrane, and down-regulated gene expressions and enzyme activities involved in acidogenic metabolism, thereby decreasing propionate production. However, although MWCNTs had a slightly negative impact on the growth and cell membrane, the gene expressions and catalytic activities were enhanced (glycolysis and pyruvate metabolism), resulting in the improved propionate production. Additionally, the gene expressions and catalytic activities of key enzymes (e.g., tpiA, pgk, PK, OTTAC, etc.) related to acidogenic metabolism were also enhanced by the co-existence of both nanomaterials, thereby promoting propionate production towards P. acidipropionici. This work demonstrated that the presence of MWCNTs could affect the inhibition of CuO NPs to fermentation processes via regulating carbon source utilization.
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Affiliation(s)
- Lei Dong
- State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China; Shanghai Municipal Engineering Design Institute (Group) Co., LTD, 901 Zhongshan North Second Road, Shanghai 200092, China
| | - Yang Wu
- State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China
| | - Yaozhi Bian
- State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China
| | - Xiong Zheng
- State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China.
| | - Lang Chen
- State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China
| | - Yinguang Chen
- State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China
| | - Xin Zhang
- Shanghai Municipal Engineering Design Institute (Group) Co., LTD, 901 Zhongshan North Second Road, Shanghai 200092, China
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10
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Tao Q, Li B, Chen Y, Zhao J, Li Q, Chen Y, Peng Q, Yuan S, Li H, Huang R, Wang C. An integrated method to produce fermented liquid feed and biologically modified biochar as cadmium adsorbents using corn stalks. WASTE MANAGEMENT (NEW YORK, N.Y.) 2021; 127:112-120. [PMID: 33933868 DOI: 10.1016/j.wasman.2021.04.027] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/27/2020] [Revised: 03/11/2021] [Accepted: 04/12/2021] [Indexed: 06/12/2023]
Abstract
The recycling of agricultural waste is a global challenge to the sustainable development of agriculture. By using corn stalks, we studied the feasibility of combining anaerobic fermentation and pyrolysis processes to produce both fermentated liquid feed and biologically modified biocharas cadmium adsorbents. Anaerobic ensiling enhanced the biodegradation of corn stalks by increasing crude protein and reducing fiber contents. After 24-h anaerobic fermentation, corn stalks silage was decomposed into the liquid filtrate and non-fermented residue. Fermented liquid feed (FLF) was prepared by storing feed and liquid filtrate (1:4.0, wt/wt) in a closed tank at 20 °C for 4 days, which showed desired properties (pH < 4.5, lactic acid bacteria greater than 9.0 lg cfu g-1, lactic acid greater than 100 mmol L-1). The non-fermented residue was pyrolyzed at 500 °C to prepare biologically modified biochar (BCB24). In comparison with pristine biochar produced from corn stalks (CB), anaerobic ensiling and anaerobic fermentation significantly increased the surface area, oxygen-containing functional groups, as well as mineral components in BCB24. The maximum sorption capacity of Cd(II) for BCB24 was 2.1 times of CB, suggesting that BCB24 is an effective adsorbent for Cd(II) removal from water. Our results indicated that coupling anaerobic fermentation and pyrolysis technology can significantly improve the efficiency of corn stalks recycling.
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Affiliation(s)
- Qi Tao
- College of Resources, Sichuan Agricultural University, Chengdu 611130, China
| | - Bing Li
- College of Resources, Sichuan Agricultural University, Chengdu 611130, China.
| | - Yixuan Chen
- College of Resources, Sichuan Agricultural University, Chengdu 611130, China
| | - Junwen Zhao
- College of Resources, Sichuan Agricultural University, Chengdu 611130, China
| | - Qiquan Li
- College of Resources, Sichuan Agricultural University, Chengdu 611130, China
| | - Yulan Chen
- Sichuan Tobacco Company Liangshanzhou Company, Xichang Sichuan 615000, China
| | - Quanhui Peng
- Institute of Animal Nutrition, Key Laboratory of Bovine Low Carbon Farming and Safe Production, Sichuan Agricultural University, Chengdu, Sichuan 611130, China
| | - Shu Yuan
- College of Resources, Sichuan Agricultural University, Chengdu 611130, China
| | - Huanxiu Li
- College of Horticulture, Sichuan Agricultural University, Chengdu 611130, China
| | - Rong Huang
- College of Resources, Sichuan Agricultural University, Chengdu 611130, China
| | - Changquan Wang
- College of Resources, Sichuan Agricultural University, Chengdu 611130, China.
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11
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Abomohra AEF, Almutairi AW. A close-loop integrated approach for microalgae cultivation and efficient utilization of agar-free seaweed residues for enhanced biofuel recovery. BIORESOURCE TECHNOLOGY 2020; 317:124027. [PMID: 32829118 DOI: 10.1016/j.biortech.2020.124027] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/03/2020] [Revised: 08/12/2020] [Accepted: 08/13/2020] [Indexed: 06/11/2023]
Abstract
The aim of this work was to evaluate a novel integrated biorefinery route for enhanced energy recovery from seaweeds and microalgae. Agar extraction prior to anaerobic digestion recorded the highest biogas productivity of 32.57 L kg-1 VS d-1. Supplementation of the microalgal growth medium with anaerobic digestate from agar-extracted biomass enhanced the microalgal growth, recording the highest dry weight of 4.57 g L-1 at 20% digestate ratio. In addition, lipid content showed the highest value of 25.8 %dw. Due to enhancement of growth and lipid content, 20% digestate ratio showed the highest lipid productivity and FAMEs recovery (65.2 mg L-1 d-1 and 123.3 mg g-1dw, respectively), with enhanced biodiesel characteristics. The present study estimated annual revenue of 1252.7 US$ ton-1 from the whole Gracilaria multipartita biomass conversion into biogas, while that through agar extraction deserved 36087.0 US$ ton-1, with enhanced annual biodiesel yield by 69.7% over the control medium.
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Affiliation(s)
- Abd El-Fatah Abomohra
- Department of Environmental Engineering, School of Architecture and Civil Engineering, Chengdu University, Chengdu 610106, China; Botany Department, Faculty of Science, Tanta University, Tanta 31527, Egypt.
| | - Adel W Almutairi
- Biological Sciences Department, Faculty of Science & Arts, King Abdulaziz University, Rabigh 21911, Saudi Arabia
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