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1. The effect of reduced pressure and glucose concentration on hydrogen and volatile fatty acid yield: The role of homoacetogenesis

Author:
Huang, Jialong; Zhao, Yongkun; Lei, Chen'ao; Liu, Yu; Wang, Yuanyuan
Source:
Bioresource technology 2021 v.329 pp. 124830
ISSN:
0960-8524
Subject:
volatile fatty acids,   etc   ; butyrates; ethanol; glucose; headspace analysis; hydrogen; technology;     Show all 7 Subjects
Abstract:
... In this study, the influence of headspace pressure (HP; 20–100 kPa) and organic loading rate (OLR; 10–30 g/L) on H₂ and volatile fatty acid (VFA) yield were investigated. The experiments were carried out in the semi-continuous mode, the main products in VFAs were ethanol and butyrate, which accounted for more than 75%. More than 79% generated H₂ was consumed through homoacetogenesis pathway when H ...
DOI:
10.1016/j.biortech.2021.124830

2. Recovery and enhanced yields of volatile fatty acids from a grass fermentation via in-situ solids separation and electrodialysis

Author:
Jones, R.J.; Massanet-Nicolau, J.; Fernandez-Feito, R.; Dinsdale, R.M.; Guwy, A.J.
Source:
Journal of cleaner production 2021 v.296 pp. 126430
ISSN:
0959-6526
Subject:
volatile fatty acids,   etc   ; bioreactors; carbon; electrochemistry; electrodialysis; fermentation; filtration; grasses;     Show all 8 Subjects
Abstract:
... An industrially applicable methodology utilising a novel combination of filtration and electrochemical separation technologies was successfully used to recover, and enhance the production of, volatile fatty acids from an 82.5 L bioreactor, continually fed with grass at 5% total solids. Volatile fatty acid yields were increased from 287 to 404 mgᵥfₐ gᵥₛ⁻¹ and concentrated up to 4800 mg L⁻¹ in a sol ...
DOI:
10.1016/j.jclepro.2021.126430

3. Enhancing anaerobic digestion process with addition of conductive materials

Author:
Liu, Yiwei; Li, Xiang; Wu, Shaohua; Tan, Zhao; Yang, Chunping
Source:
Chemosphere 2021 v.278 pp. 130449
ISSN:
0045-6535
Subject:
volatile fatty acids,   etc   ; anaerobic digestion; bioenergy; electron transfer; metabolism; methane production; sludge; wastewater treatment;     Show all 8 Subjects
Abstract:
... Anaerobic digestion is widely used for the treatment of wastewater for its low costs and bioenergy production, but the performances of anaerobic digestion often need improving in practical applications. The addition of conductive materials could lead to direct interspecies electron transfer (DIET) among the anaerobic microorganisms, and consequently enhance the efficiencies of anaerobic digestion. ...
DOI:
10.1016/j.chemosphere.2021.130449

4. 58 Evaluation of substrate:buffer ratios for in vitro cultures inoculated with equine cecal contents

Author:
Conrad, C.; Drouillard, J.; Kang, C.; Ochonski, P.; Douthit, T.; Lattimer, J.
Source:
Journal of equine veterinary science 2021 v.100 pp. 103521
ISSN:
0737-0806
Subject:
volatile fatty acids,   etc   ; Bromus; cannulas; corn; fermentation; hindgut; horses; inoculum; neutral detergent fiber; pH; veterinary medicine;     Show all 11 Subjects
Abstract:
... In vitro fermentation systems allow researchers to mimic the equine hindgut while providing quick, affordable, and publishable data. However, the substrate:buffer ratio within the system has a profound impact on subsequent fermentation parameters. The objective of this study was to evaluate effects of varying substrate levels on culture pH, gas production, dry matter disappearance (DMD), neutral d ...
DOI:
10.1016/j.jevs.2021.103521

5. Alkylethoxyglucoside-enhanced volatile fatty acids production from waste activated sludge: Performance and mechanisms

Author:
Wu, Qinglian; Zheng, Heshan; Chen, Ying; Liu, Min; Bao, Xian; Guo, Wanqian
Source:
Journal of cleaner production 2021 v.289 pp. 125765
ISSN:
0959-6526
Subject:
volatile fatty acids,   etc   ; acidification; activated sludge; degradation; dosage; enzyme substrates; hydrolysis; methane production; microorganisms; pH; surfactants;     Show all 11 Subjects
Abstract:
... The green and low-cost surfactant Alkylethoxyglucoside (AEG) was used to enhance VFAs production from waste activated sludge (WAS). VFAs production (436.27 ± 14.88 mg COD/g VSS) was improved by ∼6.15 times than the blank under the optimal dosage 0.4 g/g TSS, exceeding most of current enhancement strategies. Thereinto, AEG degradation contributed to ∼15% of total VFAs production, and its primary de ...
DOI:
10.1016/j.jclepro.2020.125765

6. New insights into the evaluation of anaerobic properties of sludge: Biodegradability and stabilization

Author:
Gao, Jun; Zhao, Xiaoyan; Chen, Sisi; Dong, Bin; Dai, Xiaohu
Source:
Journal of environmental sciences (China) 2021 v.100 pp. 158-166
ISSN:
1001-0742
Subject:
volatile fatty acids,   etc   ; biodegradability; methane; methane production; sludge; wastewater treatment; China;     Show all 7 Subjects
Abstract:
... Evaluating anaerobic biodegradability of sludge and then identifying the stabilization of digestate is necessary in sludge treatment and disposal. 48 sludge samples from 24 typical waste water treatment plants (WWTPs) in 11 provinces in China were selected to investigate the relationship between Biochemical Acidogenic Potential (BAP) test and Biochemical Methane Potential (BMP) test. The volatile ...
DOI:
10.1016/j.jes.2020.07.021

7. Feeding Value Assessment of Substituting Cassava (Manihot esculenta) Residue for Concentrate of Dairy Cows Using an In Vitro Gas Test

Author:
Zheng, Yuhui; Zhao, Yanyan; Xue, Shenglin; Wang, Wei; Wang, Yajing; Cao, Zhijun; Yang, Hongjian; Li, Shengli
Source:
Animals 2021 v.11 no.2
ISSN:
2076-2615
Subject:
volatile fatty acids,   etc   ; Holstein; Manihot esculenta; ammonium nitrogen; butyrates; cassava; crude protein; culture media; fermentation; pH;     Show all 10 Subjects
Abstract:
... The feeding value of replacing concentrate with cassava (Manihot esculenta) residue in the feed of Holstein cows was confirmed using an in vitro gas test. The treatments consisted of 0% (control, CON), 5%, 10%, 15%, 20%, 25%, and 30% inclusion of cassava residue in fermentation culture medium composed of buffer solution (50 mL) and filtrated rumen fluid (25 mL). The parameters analyzed included th ...
DOI:
10.3390/ani11020307

8. Nutrient augmentation enhances biogas production from sorghum mono-digestion

Author:
Hu, Yong; Ma, Haiyuan; Shi, Chen; Kobayashi, Takuro; Xu, Kai-Qin
Source:
Waste management 2021 v.119 pp. 63-71
ISSN:
0956-053X
Subject:
volatile fatty acids,   etc   ; fermentation; gas production (biological); methane; methane production; sulfur; waste management;     Show all 7 Subjects
Abstract:
... This study investigated the effects of the addition of micro- (Fe, Co, Ni, and Mo) and macro-(Sulfur) nutrients on mono-digestion of sorghum under mesophilic conditions. A continuous stirred-tank reactor was operated for more than 420 days under seven different experimental conditions. The experimental results showed poor performance for methane production and process stability without nutrient su ...
DOI:
10.1016/j.wasman.2020.09.041

9. Mini art review for zero valent iron application in anaerobic digestion and technical bottlenecks

Author:
Kong, Xin; Niu, Jianan; Zhang, Wenjing; Liu, Jianguo; Yuan, Jin; Li, Houfen; Yue, Xiuping
Source:
The Science of the total environment 2021 v.791 pp. 148415
ISSN:
0048-9697
Subject:
volatile fatty acids,   etc   ; ; acidification; ammonia; anaerobic digestion; bioelectrochemistry; environment; enzyme activity; iron; mass transfer; metabolism; methane; methane production; pollution;     Show all 14 Subjects
Abstract:
... Zero valent iron (ZVI) has been used extensively to control environmental pollution owing to its strong reducibility and low cost. Herein, we evaluate the impact of ZVI (iron scrap and ZVI powder with different scales) on anaerobic digestion (AD) reactor performance improvement and syntrophic relationship stimulation among various microbial groups in the methanogenesis process. In recent studies, ...
DOI:
10.1016/j.scitotenv.2021.148415

10. Arrested methanogenesis digestion of high-strength cheese whey and brewery wastewater with carboxylic acid production

Author:
Wu, Haoran; Dalke, Rachel; Mai, Jesse; Holtzapple, Mark; Urgun-Demirtas, Meltem
Source:
Bioresource technology 2021 v.332 pp. 125044
ISSN:
0960-8524
Subject:
volatile fatty acids,   etc   ; anaerobic digestion; biomass; cheese whey; community structure; lactic acid; methane production; microbial communities; pH; wastewater;     Show all 10 Subjects
Abstract:
... A new anaerobic digestion process based on arrested methanogenesis (AM) was developed to treat high-strength cheese whey and brewery wastewater with simultaneous carboxylic acid production. This study specifically determined the links between wastewater characteristics, microbial community structure, and the operation of AM digesters at the bench scale. The highest total carboxylic acids concentra ...
DOI:
10.1016/j.biortech.2021.125044

11. Extraruminal Fermentation of Citrus, Grape and Apple Pomaces: Assessing the Potential to Serve as Feedstock for Production of Volatile Fatty acids

Author:
Njokweni, Sesethu G.; Weimer, Paul J.; Botes, Marelize; Cruywagen, Christiaan W.; van Zyl, Willem H.
Source:
Waste and biomass valorization 2021 v.12 no.7 pp. 3671-3681
ISSN:
1877-2641
Subject:
volatile fatty acids,   etc   ; Citrus; apples; biomass; digestibility; electrochemistry; energy; feedstocks; fermentation; fuel production; grapes; neutral detergent fiber; pomace; wastes;     Show all 14 Subjects
Abstract:
... Characterisation of pomace from citrus fruits, grapes and apples has shown to be rich in compounds that contain untapped energetic value with potential to serve as feedstock for biochemical and biofuel production. This study aimed to investigate the potential of recovering the energy in citrus (CtP), grape (GP) and apple (AP) pomace by extraruminal fermentations to produce VFA with utility to serv ...
DOI:
10.1007/s12649-020-01254-4

12. Unveiling the different faces of chlortetracycline in fermentative volatile fatty acid production from waste activated sludge

Author:
Tang, Mengge; Wu, Yanxin; Zeng, Xingning; Yang, Xiao; Wang, Dongbo; Chen, Hongbo
Source:
Bioresource technology 2021 v.329 pp. 124875
ISSN:
0960-8524
Subject:
volatile fatty acids,   etc   ; acetate kinase; acidification; activated sludge; antibiotic residues; chlortetracycline; fermentation; methane production; polymers; secretion; wastewater treatment;     Show all 11 Subjects
Abstract:
... One of the key challenges of wastewater treatment today is to understand the potential effect of residual pollutants on the management of waste activated sludge (WAS). This study aims to clarify the effect of chlortetracycline (CTC) as a residual antibiotic on the anaerobic fermentation of WAS to produce volatile fatty acids (VFAs). The results show that CTC with a concentration of 10 mg/kg total ...
DOI:
10.1016/j.biortech.2021.124875

13. Empirical Evaluation and Prediction of Protein Requirements for Maintenance and Growth of 18–24 Months Old Thai Swamp Buffaloes

Author:
Paengkoum, Siwaporn; Tatsapong, Pattaraporn; Taethaisong, Nittaya; Sorasak, Thongpea; Purba, Rayudika Aprilia Patindra; Paengkoum, Pramote
Source:
Animals 2021 v.11 no.5
ISSN:
2076-2615
Subject:
volatile fatty acids,   etc   ; absorption; average daily gain; blood; buffaloes; crude protein; energy intake; nitrogen; prediction; protein requirement; swamps; urine;     Show all 12 Subjects
Abstract:
... In some geographical areas and in certain breeding situations, the interpretation of increased gain in the bovine is difficult to investigate. Due to their inherent genetic variations, their energy and protein needs vary as a function of inherent genetic differences, making these requirements difficult to accurately assess in bull species, e.g., Thai swamp buffalo. The study aimed at investigating ...
DOI:
10.3390/ani11051405

14. Effect of microaerobic microbial pretreatment on anaerobic digestion of a lignocellulosic substrate under controlled pH conditions

Author:
Xu, Haipeng; Li, Yan; Hua, Dongliang; Zhao, Yuxiao; Chen, Lei; Zhou, Lei; Chen, Guanyi
Source:
Bioresource technology 2021 v.328 pp. 124852
ISSN:
0960-8524
Subject:
volatile fatty acids,   etc   ; anaerobic digestion; cellulose; chemical oxygen demand; corn stover; cow manure; hydrolysis; inoculum; lignocellulose; methane production; pH;     Show all 11 Subjects
Abstract:
... The effects of various microaeration strategies and process parameters on anaerobic digestion (AD) of lignocellulosic substrates have received increased attention; however, different results have been reported. To determine optimal conditions and clarify the mechanisms influencing this process, the effect of pretreatment of microaerobic microbial on corn stover decomposition and AD was investigate ...
DOI:
10.1016/j.biortech.2021.124852

15. Optimizing food waste hydrothermal parameters to reduce Maillard reaction and increase volatile fatty acid production

Author:
Liu, Jiaze; Yin, Jun; He, Xiaozhen; Chen, Ting; Shen, Dongsheng
Source:
Journal of environmental sciences (China) 2021 v.103 pp. 43-49
ISSN:
1001-0742
Subject:
volatile fatty acids,   etc   ; Maillard reaction; food waste; hot water treatment; hydrolysis; melanoidins; pH; response surface methodology; temperature; water content; China;     Show all 11 Subjects
Abstract:
... The occurrence of the Maillard reaction and melanoidins formation during the hydrothermal treatment of food waste can reduce the yield of volatile fatty acids (VFA); however, few studies have investigated the adverse effects of the Maillard reaction. This study identified the impact of hydrothermal treatment parameters on hydrolysis and melanoidins formation and optimized the hydrothermal treatmen ...
DOI:
10.1016/j.jes.2020.09.032

16. The effect of the inclusion of pea in lamb fattening concentrate on in vitro and in situ rumen fermentation

Author:
Joy, Margalida; Rufino‐Moya, Pablo; Lobón, Sandra; Blanco, Mireia
Source:
Journal of the science of food and agriculture 2021 v.101 no.7 pp. 3041-3048
ISSN:
0022-5142
Subject:
volatile fatty acids,   etc   ; acetic acid; agriculture; ammonia; fermentation; methane; nitrogen; organic matter; peas; protein sources; rumen fermentation; soybean meal;     Show all 12 Subjects
Abstract:
... BACKGROUND: The objective of this study was to evaluate the effect of the proportion of pea (0%, 10%, 20%, and 30%), as a partial replacement for soybean meal (SBM) in the fattening concentrate, on ruminal fermentation in lambs. Gas and methane (CH₄) production, in vitro dry matter degradability (IVDMD), ammonia (NH₃‐N), and volatile fatty acid (VFA) production after 24 h of incubation were evalua ...
DOI:
10.1002/jsfa.10938

17. A Comprehensive Comparison of Methane and Bio-Based Volatile Fatty Acids Production from Urban and Agro-Industrial Sources

Author:
Cerdán, José Manuel Alejandro; Tejido-Nuñez, Yaiza; Aymerich, Enrique; de GoñiGoñi, Jaime González-Mtnez; Garcia-Aguirre, Jon
Source:
Waste and biomass valorization 2021 v.12 no.3 pp. 1357-1369
ISSN:
1877-2641
Subject:
volatile fatty acids,   etc   ; biomass; butyric acid; fermentation; fermented foods; industrial applications; methane; methanogens; microalgae; organic wastes; pH; temperature;     Show all 12 Subjects
Abstract:
... In this study, a systematic comparison between methanogenic and acidogenic potential tests of five waste streams from urban and agro-industrial origin was investigated. Methanogenic potential tests were performed under neutral pH (7.0) and thermophilic temperature (55°C). Additionally, acidogenic potential tests consisted of mono-fermentation tests at acidic pH (5.5) and co-fermentation tests perf ...
DOI:
10.1007/s12649-020-01093-3

18. Effects of α-glyceryl monolaurate on growth, immune function, volatile fatty acids, and gut microbiota in broiler chickens

Author:
Lan, Junhong; Chen, Guangyong; Cao, Gungtian; Tang, Jianing; Li, Qing; Zhang, Bing; Yang, Caimei
Source:
Poultry science 2021 v.100 no.3 pp. 100875
ISSN:
0032-5791
Subject:
volatile fatty acids,   etc   ; Bacteroides; acetates; bacitracin; butyrates; diet; globulins; growth performance; immune response; intestinal microorganisms; propionic acid; weight gain;     Show all 12 Subjects
Abstract:
... This study was conducted to determine the effects of dietary addition of α-glyceryl monolaurate (α-GML) on growth performance, immune function, volatile fatty acids production and cecal microbiota in broiler chickens. A total of 480 1-day-old yellow-feathered broilers were randomly assigned in equal numbers to 4 dietary treatments: basal diet (NCO) or supplementations with 30 mg/kg bacitracin (ANT ...
DOI:
10.1016/j.psj.2020.11.052

19. Performance evaluation and microbial community analysis of microaerobic pretreatment on thermophilic dry anaerobic digestion

Author:
Zhen, Feng; Luo, Xinjian; Xing, Tao; Sun, Yongming; Kong, Xiaoying; Li, Wenzhe
Source:
Biochemical engineering journal 2021 v.167 pp. 107873
ISSN:
1369-703X
Subject:
volatile fatty acids,   etc   ; Firmicutes; anaerobic digestion; digestive system; gas production (biological); hydrolysis; methane production; methanogens; microbial communities; oxygen; propionic acid;     Show all 11 Subjects
Abstract:
... In this study, microaerobic pretreatment (MP) was used to improve the system stability and biogas production performance of the thermophilic dry anaerobic digestion (AD). The results showed that proper MP made the AD have better methane-producing performance and the maximum cumulative methane production was 108.31 mL/g VS with an oxygen load of 5 mL/g VS, which was 13.20 % higher than that of cont ...
DOI:
10.1016/j.bej.2020.107873

20. Refining Knowledge of Factors Affecting Vitamin B12 Concentration in Bovine Milk

Author:
Duplessis, Mélissa; Fréchette, Annie; Poisson, William; Blais, Lya; Ronholm, Jennifer
Source:
Animals 2021 v.11 no.2
ISSN:
2076-2615
Subject:
volatile fatty acids,   etc   ; Holstein; bulk milk; consumer attitudes; early lactation; health foods; liquids; milk; pH; regression analysis; straw; vitamin B12;     Show all 12 Subjects
Abstract:
... Milk is an excellent source of vitamin B₁₂ (B12) for humans. Therefore, being able to guarantee a high and consistent concentration of this vitamin would enhance consumer perception of milk as a health food. The aim of the paper was to gather additional knowledge on factors that could explain B12 variation in cow milk through two observational studies: (1) to explore the relationship between milk ...
DOI:
10.3390/ani11020532