1
|
Li D, Ping Q, Guo W, Chen Y, Wang L, Li Y. Evaluating effects of biochar on anaerobic digestion of dewatered waste activated sludge: Digester performance, microbial co-metabolism and underlying mechanism. CHEMOSPHERE 2023; 341:140139. [PMID: 37690547 DOI: 10.1016/j.chemosphere.2023.140139] [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: 07/22/2023] [Revised: 09/07/2023] [Accepted: 09/08/2023] [Indexed: 09/12/2023]
Abstract
Biochar has been proven to be capable of improving the performance of anaerobic digestion (AD). However, the effect of biochar on microbial communities remains ambiguous. In this study, the influence of pH was excluded in a semi-continuous anaerobic digestor for the treatment of dewatered waste activated sludge (WAS) to determine the effect of biochar on microbes. Compared with the control group, the average methane production increased by 24.5% and 23.2% at the organic loading rates (OLRs) of 1.56 and 3.00 gTS/L/d, respectively, in the presence of biochar. This study innovatively found biochar accelerated the enrichment of Methanofastidiosaceae, which competed with Methanobacteriaceae for H2, and its abundance increased from 0.99% at the OLR of 1.56 g TS/L/d to 16.57% and 38.11% at the OLR of 3.00 and 5.60 gTS/L/d, respectively. The efficient metabolic network of f__norank_o__Aminicenantales, syntrophic bacteria, Methanofastidiosaceae and Methanosaetaceae promoted the conversion of WAS to CH4 in the biochar group. In addition, metagenome analysis revealed that biochar optimized the metabolites related to energy conservation and electron transfer, particularly for hydrogenase (frhABG, mbhLHK and hndA-D), confirming that biochar changed the way H2 was involved in methanogenesis. These findings provide novel insights into the direct effect of biochar on microbial evolution and facilitate the reduction of WAS to achieve higher economic benefits in biogas production.
Collapse
Affiliation(s)
- Dunjie Li
- State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China
| | - Qian Ping
- State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai, 200092, China
| | - Wenjie Guo
- State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China
| | - Yifeng Chen
- State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China
| | - Lin Wang
- State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai, 200092, China
| | - Yongmei Li
- State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai, 200092, China.
| |
Collapse
|
2
|
Liang J, Luo L, Wong JWC, He D. Recent advances in conductive materials amended anaerobic co-digestion of food waste and municipal organic solid waste: Roles, mechanisms, and potential application. BIORESOURCE TECHNOLOGY 2022; 360:127613. [PMID: 35840024 DOI: 10.1016/j.biortech.2022.127613] [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: 05/11/2022] [Revised: 07/06/2022] [Accepted: 07/07/2022] [Indexed: 06/15/2023]
Abstract
Recently, conductive materials (i.e., carbon-based and iron-based materials) as a feasible and attractive approach have been introduced to anaerobic co-digestion (ACoD) system for promoting its performance and stability through direct interspecies electron transfer. Owing to the key roles of conductive materials in ACoD process, it is imperative to gain a profound understanding of their specific functions and mechanisms. Here, this review critically examined the state of the art of conductive materials assisted ACoD of food waste and common municipal organic solid waste. Then, the fundamental roles of conductive materials on ACoD enhancement and the relevant mechanisms were discussed. Last, the perspectives for co-digestate treatment, reutilization, and disposal were summarized. Moreover, the main challenges to conductive materials amended ACoD in on-site application were proposed and the future remarks were put forward. Collectively, this review poses a scientific basis for the potential application of conductive materials in ACoD process in the future.
Collapse
Affiliation(s)
- Jialin Liang
- Engineering and Technology Research Center for Agricultural Land Pollution Integrated Prevention and Control of Guangdong Higher Education Institute, College of Resources and Environment, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, China
| | - Liwen Luo
- Institute of Bioresource and Agriculture, Sino-Forest Applied Research Centre for Pearl River Delta Environment, Department of Biology, Hong Kong Baptist University, Kowloon Tong, Hong Kong SAR, China
| | - Jonathan W C Wong
- Institute of Bioresource and Agriculture, Sino-Forest Applied Research Centre for Pearl River Delta Environment, Department of Biology, Hong Kong Baptist University, Kowloon Tong, Hong Kong SAR, China; School of Technology, Huzhou University, Huzhou 311800, China.
| | - Di He
- Key Laboratory for City Cluster Environmental Safety and Green Development of the Ministry of Education, School of Ecology, Environment and Resources, Guangdong University of Technology, Guangzhou 510006, China
| |
Collapse
|
3
|
Kizito S, Jjagwe J, Mdondo SW, Nagawa CB, Bah H, Tumutegyereize P. Synergetic effects of biochar addition on mesophilic and high total solids anaerobic digestion of chicken manure. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2022; 315:115192. [PMID: 35550972 DOI: 10.1016/j.jenvman.2022.115192] [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: 02/26/2022] [Revised: 04/09/2022] [Accepted: 04/25/2022] [Indexed: 06/15/2023]
Abstract
High solids anaerobic digestion (AD) of chicken manure (CM) is often challenging due to ammonia-N inhibition and accumulation of volatile fatty acids (VFAs). This study evaluated the effect of adding biochars from different feedstock to ameliorate semi-dry AD of fresh CM during batch fermentation. Experiments were performed in 300 mL at two total solid (TS) levels (12% and 15%) under mesophilic (36 ±1ᵒC) conditions for 55 d, using activated sludge as inoculum. Treatments included: fresh CM (at 12% or 15% TS) mixed separately with rice husks char (RB), wood char (WB) and bamboo char (BB) at biochar dosages of 2.5%, 5% and 10% of TS in the CM, inoculum only and inoculum plus CM without addition of char as the control. Results indicated that addition of biochar reduced the lag phases to 4-5.4 d and AD performances were significantly improved with total volatile solids removal of 53-67% and 62-71%, and cumulative methane of 277-380 mL/gVS (CH4 content ≈ 51-63%) and 297-438 mL/gVS (CH4 content ≈ 49-67%) at 12% and 15% TS, respectively. Biochar buffered over acidification and stabilized pH in the range of 6.5-7.8 but mild ammonia inhibition still occurred in all biochar treatments due to the high residual total ammonia-N (4.3 g-5.6 g/L). For all the investigated parameters, WB amended digesters exhibited the best results owing to its high specific surface area, porosity, cationic exchange capacity, and elemental composition which were superior to those of RB and BB. At 10% dosage of all tested biochars, the AD process was more stable and methane content neared optimal of >65% CH4. Therefore, addition of biochar from lignocellulosic materials at a given threshold dosage could promote semi-dry and dry biogas production from chicken manure and thus add value to this waste which in most cases is improperly managed.
Collapse
Affiliation(s)
- Simon Kizito
- Department of Forestry, Biodiversity and Tourism, School of Forestry, Environmental and Geographical Sciences, Makerere University, P.O.Box 7062, Kampala, Uganda.
| | - Joseph Jjagwe
- Department of Mechanical Engineering, College of Engineering, Design, Art and Technology, Makerere University, P.O.Box.7062, Kampala, Uganda
| | - Simon Wandera Mdondo
- Department of Civil, Construction and Environmental Engineering, Jomo Kenyatta University of Agriculture and Technology, P. O. Box 43844-00100, Nairobi, Kenya
| | - Christine Betty Nagawa
- Department of Forestry, Biodiversity and Tourism, School of Forestry, Environmental and Geographical Sciences, Makerere University, P.O.Box 7062, Kampala, Uganda
| | - Hamidou Bah
- Institute Superior Agronomy and Veterinary of Faranah (ISAV/F), Faranah 131, Guinea
| | - Peter Tumutegyereize
- Department of Agricultural and Biosystems Engineering, School of Food Technology, Nutrition and Bioengineering, Makerere University, P.O. Box 7062, Kampala, Uganda
| |
Collapse
|
4
|
Sánchez E, Herrmann C, Maja W, Borja R. Effect of organic loading rate on the anaerobic digestion of swine waste with biochar addition. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:38455-38465. [PMID: 33733420 DOI: 10.1007/s11356-021-13428-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/25/2020] [Accepted: 03/09/2021] [Indexed: 06/12/2023]
Abstract
The aim of this study was to investigate the impact of biochar addition on the mesophilic semi-continuous anaerobic digestion of swine waste with a focus on the effects of the organic loading rate (OLR) on biogas production, methane yield, total volatile fatty acids (TVFA), alkalinity, ammonium, volatile solids (VS) removal efficiency and process stability. Four reactors, two with amended biochar (R1 and R2) and two without biochar addition as controls (R3 and R4), were operated at OLRs in the range of 2-7 g VS/(L d), which corresponded to hydraulic retention times (HRTs) in the range of 7-2 days, respectively. The addition of biochar initially caused an increase in the generation of biogas and methane when compared to the control reactors when the process operated at OLRs of 2 and 3 g VS/(L d). This behaviour could be attributed to the presence of several trace elements (such as Fe, Co, Ni and Mn) in the biochar, which are involved in the action of acetyl-CoA synthase and methyl coenzyme M reductase to catalyse key metabolic steps, especially the methanogenic stage. The pH, alkalinity, TVFA and TVFA/Alkalinity ratio values for the effluents remained within the optimal ranges for the anaerobic digestion process. It was also found that the increase in OLR in the range of 2-5 g VS/(L d) determined a proportional increase in the VS removal rate. However, when the OLR increased up to 7 g VS/(L d), a drastic decrease in the VS removal rate was found for the control reactors. Biochar amendment contributed to a more balanced state of the anaerobic process, preventing biomass washout.
Collapse
Affiliation(s)
- Enrique Sánchez
- Investment GAMMA S.A, Ministry of Science, Technology and Environment, Calle 14 Nro. 308 e/ 3ra y 5ta, La Habana, Cuba
| | - Christiane Herrmann
- Department of Bioengineering, Leibniz Institute for Agricultural Engineering and Bioeconomy (ATB), Max-Eyth-Allee 100, 14469, Potsdam, Germany
| | - Werner Maja
- Department of Bioengineering, Leibniz Institute for Agricultural Engineering and Bioeconomy (ATB), Max-Eyth-Allee 100, 14469, Potsdam, Germany
| | - Rafael Borja
- Instituto de la Grasa, Consejo Superior de Investigaciones Científicas (CSIC), Campus Universidad Pablo de Olavide, Edificio 46, Ctra. de Utrera, km1-41013, Sevilla, Spain.
| |
Collapse
|
5
|
Determination of methane generation potential and evaluation of kinetic models in poultry wastes. BIOCATALYSIS AND AGRICULTURAL BIOTECHNOLOGY 2021. [DOI: 10.1016/j.bcab.2021.101936] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
6
|
Baek G, Saikaly PE, Logan BE. Addition of a carbon fiber brush improves anaerobic digestion compared to external voltage application. WATER RESEARCH 2021; 188:116575. [PMID: 33152589 DOI: 10.1016/j.watres.2020.116575] [Citation(s) in RCA: 32] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/03/2020] [Revised: 10/11/2020] [Accepted: 10/26/2020] [Indexed: 06/11/2023]
Abstract
Two methods were examined to improve methane production efficiency in anaerobic digestion (AD) based on adding a large amount of surface area using a single electrically conductive carbon brush, or by adding electrodes as done in microbial electrolysis cells (MECs) to form a hybrid AD-MEC. To examine the impact of surface area relative to electrodes, AD reactors were fitted with a single large brush without electrodes (FB), half a large brush with two electrodes with an applied voltage (0.8 V) and operated in closed circuit (HB-CC) or open circuit (HB-OC) mode, or only two electrodes with a closed circuit and no large brush (NB-CC) (equivalent to an MEC). The three configurations with a half or full brush all had improved performance as shown by 57-82% higher methane generation rate parameters in the Gompertz model compared to NB-CC. The retained biomass was much higher in the reactors with large brush, which likely contributed to the rapid consumption of volatile fatty acids (VFAs) and therefore improved AD performance. A different microbial community structure was formed in the large-size brushes compared to the electrodes. Methanothrix was predominant in the biofilm of large-size carbon brush, while Geobacter (anode) and Methanobacterium (cathode) were highly abundant in the electrode biofilms. These results demonstrate that adding a high surface area carbon fiber brush will be a more effective method of improving AD performance than using MEC electrodes with an applied voltage.
Collapse
Affiliation(s)
- Gahyun Baek
- Department of Civil and Environmental Engineering, The Pennsylvania State University, 231Q Sackett Building, University Park, PA 16802, USA
| | - Pascal E Saikaly
- Biological and Environmental Science and Engineering Division, Water Desalination and Reuse Research Center, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
| | - Bruce E Logan
- Department of Civil and Environmental Engineering, The Pennsylvania State University, 231Q Sackett Building, University Park, PA 16802, USA.
| |
Collapse
|
7
|
Xu S, Zhang W, Zuo L, Qiao Z, He P. Comparative facilitation of activated carbon and goethite on methanogenesis from volatile fatty acids. BIORESOURCE TECHNOLOGY 2020; 302:122801. [PMID: 32004811 DOI: 10.1016/j.biortech.2020.122801] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2019] [Revised: 01/08/2020] [Accepted: 01/10/2020] [Indexed: 06/10/2023]
Abstract
To provide insight into direct interspecies electron transfer (DIET) via carbon-based materials and ferric oxides, the effects of three conductive materials (i.e. activated carbon (AC), iron modified activated carbon (FEAC) and goethite (FEOOH)), on methanogenesis from volatile fatty acids (VFAs) were evaluated. Under the acid stress (~4 g/L VFAs), the maximum methane yield of 266 mL/g-chemical oxygen demand (COD) was found in the FEOOH supplemented reactor, which was 48% higher than that of AC reactor. The reasons for the enhanced activity of the electron transport chain and extracellular electron transfer ability by FEOOH include: 1) the activation on iron-containing enzymes that involved in methanogenesis and acidogenesis; 2) selective enrichment on functional microorganism. The higher electron donating capacities (EDC) value of FEOOH may be a triggering factor on the growth of Syntrophomonadaceae, which perform DIET with methanogens (Methanosaeta and Methanosarcina) for the syntrophic degradation of VFAs.
Collapse
Affiliation(s)
- Suyun Xu
- School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, PR China
| | - Wanqiu Zhang
- School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, PR China
| | - Liuquan Zuo
- School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, PR China
| | - Zihao Qiao
- School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, PR China
| | - Pinjing He
- School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, PR China; Institute of Waste Treatment and Reclamation, Tongji University, Shanghai 200092, PR China.
| |
Collapse
|
8
|
Acclimation Improves Methane Production from Molasses Wastewater with High Salinity in an Upflow Anaerobic Filter Reactor: Performance and Microbial Community Dynamics. Appl Biochem Biotechnol 2020; 191:397-411. [DOI: 10.1007/s12010-020-03236-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2019] [Accepted: 01/08/2020] [Indexed: 11/26/2022]
|
9
|
Indren M, Birzer CH, Kidd SP, Medwell PR. Effect of total solids content on anaerobic digestion of poultry litter with biochar. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2020; 255:109744. [PMID: 31756577 DOI: 10.1016/j.jenvman.2019.109744] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/16/2019] [Revised: 10/14/2019] [Accepted: 10/20/2019] [Indexed: 05/22/2023]
Abstract
Methane production via anaerobic digestion of poultry litter provides a pathway for energy production from an abundant waste product. Recent studies have shown the use of biochar (pyrolysed biomass) can decrease methane production lag times and increase peak daily yields from ammonia-stressed low-solids anaerobic digesters. Due to the variety of feedstocks and digester configurations used, research to date has not yet determined the effect of biochar addition as a function of the digester total solids content. This study shows the addition of biochar reduces the lag time by a greater percentage in the digesters with a higher total solids content. There was a 17%, 27% and 41% reduction lag time due to biochar addition at total solids contents of 5%, 10% and 20%, respectively. The peak daily methane yield increased by 136% at 10% total solids. There was no significant increase in the peak yield at 5% total solids, while there was a 46% increase at 20% total solids. Real-time PCR analysis confirms the Methanosaetaceae family, which is a key methanogen due to its ability to facilitate direct interspecies electron transfer while attached to biochar, preferentially attaches to biochar. Furthermore, this research shows the attachment of the Methanosaetaceae family, does not decrease with increasing total solids content. A potential negative effect of biochar addition, a reduced volumetric efficiency, can be negated by using a shorter retention time. This new understanding will help to improve predictions of the impact of biochar addition for new digester designs operating in semi-solids and high-solids conditions.
Collapse
Affiliation(s)
- Mathu Indren
- School of Mechanical Engineering, The University of Adelaide, SA, 5005, Australia; Humanitarian and Development Solutions Initiative, The University of Adelaide, SA, 5005, Australia.
| | - Cristian H Birzer
- School of Mechanical Engineering, The University of Adelaide, SA, 5005, Australia; Humanitarian and Development Solutions Initiative, The University of Adelaide, SA, 5005, Australia
| | - Stephen P Kidd
- School of Biological Sciences, The University of Adelaide, SA, 5005, Australia; Humanitarian and Development Solutions Initiative, The University of Adelaide, SA, 5005, Australia
| | - Paul R Medwell
- School of Mechanical Engineering, The University of Adelaide, SA, 5005, Australia; Humanitarian and Development Solutions Initiative, The University of Adelaide, SA, 5005, Australia
| |
Collapse
|
10
|
De Vrieze J, Arends JBA, Verbeeck K, Gildemyn S, Rabaey K. Interfacing anaerobic digestion with (bio)electrochemical systems: Potentials and challenges. WATER RESEARCH 2018; 146:244-255. [PMID: 30273809 DOI: 10.1016/j.watres.2018.08.045] [Citation(s) in RCA: 56] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/06/2018] [Revised: 08/14/2018] [Accepted: 08/17/2018] [Indexed: 06/08/2023]
Abstract
For over a century, anaerobic digestion has been a key technology in stabilizing organic waste streams, while at the same time enabling the recovery of energy. The anticipated transition to a bio-based economy will only increase the quantity and diversity of organic waste streams to be treated, and, at the same time, increase the demand for additional and effective resource recovery schemes for nutrients and organic matter. The performance of anaerobic digestion can be supported and enhanced by (bio)electrochemical systems in a wide variety of hybrid technologies. Here, the possible benefits of combining anaerobic digestion with (bio)electrochemical systems were reviewed in terms of (1) process monitoring, control, and stabilization, (2) nutrient recovery, (3) effluent polishing, and (4) biogas upgrading. The interaction between microorganisms and electrodes with respect to niche creation is discussed, and the potential impact of this interaction on process performance is evaluated. The strength of combining anaerobic digestion with (bio)electrochemical technologies resides in the complementary character of both technologies, and this perspective was used to distinguish transient trends from schemes with potential for full-scale application. This is supported by an operational costs assessment, showing that the economic potential of combining anaerobic digestion with a (bio)electrochemical system is highly case-specific, and strongly depends on engineering challenges with respect to full-scale applications.
Collapse
Affiliation(s)
- Jo De Vrieze
- Center for Microbial Ecology & Technology (CMET), Ghent University, Coupure Links 653, B-9000, Gent, Belgium
| | - Jan B A Arends
- Center for Microbial Ecology & Technology (CMET), Ghent University, Coupure Links 653, B-9000, Gent, Belgium
| | - Kristof Verbeeck
- Center for Microbial Ecology & Technology (CMET), Ghent University, Coupure Links 653, B-9000, Gent, Belgium
| | - Sylvia Gildemyn
- Center for Microbial Ecology & Technology (CMET), Ghent University, Coupure Links 653, B-9000, Gent, Belgium; OWS nv, Dok Noord 5, 9000, Gent, Belgium
| | - Korneel Rabaey
- Center for Microbial Ecology & Technology (CMET), Ghent University, Coupure Links 653, B-9000, Gent, Belgium.
| |
Collapse
|
11
|
Gómez X, Meredith W, Fernández C, Sánchez-García M, Díez-Antolínez R, Garzón-Santos J, Snape CE. Evaluating the effect of biochar addition on the anaerobic digestion of swine manure: application of Py-GC/MS. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2018; 25:25600-25611. [PMID: 29959741 DOI: 10.1007/s11356-018-2644-4] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2018] [Accepted: 06/24/2018] [Indexed: 06/08/2023]
Abstract
The anaerobic digestion process of swine manure was studied when char was used as supplement for improving performance. The use of pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS) was proposed for assessing the organic matter degradation. The assessment on biogas production was carried out using samples of swine manure (SM) supplemented with char in one case and pre-treated by microwave irradiation in the other. This experimental set-up allows for the comparison of the biological degradation observed under these two different configurations and therefore aids in understanding the effect of char particles on the process. Results showed similar performance for both systems, with an average improvement of 39% being obtained in methane production when compared to the single digestion of SM. The analysis of digestate samples by Fourier transform infrared (FTIR) spectroscopy and Py-GC/MS showed improved degradation of proteins, with the Py-GC/MS technique also capable of identifying an increase in microbial-derived material when char was added, therefore highlighting the relevant role of carbon conductive particles on biological systems. Py-GC/MS along with the use of FTIR spectroscopy has proven to be useful tools when evaluating anaerobic digestion.
Collapse
Affiliation(s)
- Xiomar Gómez
- Chemical and Environmental Bioprocess Engineering Department, Natural Resources Institute (IRENA), University of León, Avda. de Portugal 41, 24071, León, Spain.
| | - William Meredith
- Faculty of Engineering, The Energy Technologies Building, University of Nottingham, Innovation Park, Jubilee Campus, Triumph Road, Nottingham, NG7 2TU, UK
| | - Camino Fernández
- Chemical and Environmental Bioprocess Engineering Department, Natural Resources Institute (IRENA), University of León, Avda. de Portugal 41, 24071, León, Spain
| | - Mario Sánchez-García
- Research Institute of Vine and Wine (IIVV), University of León, Avda. de Portugal 41, 24071, León, Spain
| | - Rebeca Díez-Antolínez
- Chemical and Environmental Bioprocess Engineering Department, Natural Resources Institute (IRENA), University of León, Avda. de Portugal 41, 24071, León, Spain
| | - Jorge Garzón-Santos
- Research Institute of Vine and Wine (IIVV), University of León, Avda. de Portugal 41, 24071, León, Spain
| | - Collin E Snape
- Faculty of Engineering, The Energy Technologies Building, University of Nottingham, Innovation Park, Jubilee Campus, Triumph Road, Nottingham, NG7 2TU, UK
| |
Collapse
|
12
|
Xu S, Han R, Zhang Y, He C, Liu H. Differentiated stimulating effects of activated carbon on methanogenic degradation of acetate, propionate and butyrate. WASTE MANAGEMENT (NEW YORK, N.Y.) 2018; 76:394-403. [PMID: 29606531 PMCID: PMC5980998 DOI: 10.1016/j.wasman.2018.03.037] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2017] [Revised: 03/17/2018] [Accepted: 03/23/2018] [Indexed: 05/24/2023]
Abstract
Granular activated carbon (GAC) could promote methane production from organic wastes, but a wide range of dosages has been reported. In present study, different GAC dosages of 0, 0.5, 5 and 25 g/L were supplemented into anaerobic digesters and the methanogenic degradation kinetics of acetate, propionate and butyrate were characterized, respectively. At high organic load of 5 g/L, the degradation rates of propionate and butyrate increased by 1.5-4.7 and 2.5-7.0 times at varied GAC dosages. The methane production rates (Rmax) from propionate and butyrate were significantly elevated when increasing GAC dosage up to 5 g/L. However, only a minor increment was found for acetate degradation either at 1 g/L or 5 g/L. The stimulatory mechanism of GAC for accelerated syntrophic degradation of propionate and butyrate can be primarily attributed to the triggering effect on acetogenesis, as evidenced by the enrichment of syntrophic bacteria e.g. Thermovirga, Synergistaceae, and Syntrophomonas etc.
Collapse
Affiliation(s)
- Suyun Xu
- Department of Environment & Low-Carbon Science, School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China.
| | - Runqi Han
- Department of Environment & Low-Carbon Science, School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China
| | - Yuchen Zhang
- Department of Environment & Low-Carbon Science, School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China
| | - Chuanqiu He
- Department of Environment & Low-Carbon Science, School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China
| | - Hongbo Liu
- Department of Environment & Low-Carbon Science, School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China.
| |
Collapse
|