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1. Reducing the effect of non-volatile fatty acids (non-VFAs) on polyhydroxyalkanoates (PHA) production from fermented thermal-hydrolyzed sludge

Author:
Tu, Weiming; Zou, Yina; Wu, Menghan; Wang, Hui
Source:
International journal of biological macromolecules 2020 v.155 pp. 1317-1324
ISSN:
0141-8130
Subject:
volatile fatty acids,   etc   ; adverse effects; carbon; feedstocks; microorganisms; polyhydroxyalkanoates; sludge;     Show all 7 Subjects
Abstract:
... Thermal-hydrolyzed sludge (THS) can be fermented to produce volatile fatty acids (VFAs) rich liquids. These fermentative liquids are considered as a potential feedstock for polyhydroxyalkanoates (PHA) production. However, the presence of high levels of non-VFAs organics supporting the growth response instead of PHA accumulation hindered an efficient culture selection in a feast and famine regime. ...
DOI:
10.1016/j.ijbiomac.2019.11.103

2. Overview of key operation factors and strategies for improving fermentative volatile fatty acid production and product regulation from sewage sludge

Author:
Fang, Wei; Zhang, Xuedong; Zhang, Panyue; Wan, Jijun; Guo, Hongxiao; Ghasimi, Dara S.M.; Morera, Xavier Carol; Zhang, Tao
Source:
Journal of environmental sciences (China) 2020 v.87 pp. 93-111
ISSN:
1001-0742
Subject:
volatile fatty acids,   etc   ; fermentation; hydrolysis; methane production; sewage sludge;     Show all 5 Subjects
Abstract:
... In recent years, volatile fatty acid (VFA) production through anaerobic fermentation of sewage sludge, instead of methane production, has been regarded as a high-value and promising roadmap for sludge stabilization and resource recovery. This review first presents the effects of some essential factors that influence VFA production and composition. In the second part, we present an extensive analys ...
DOI:
10.1016/j.jes.2019.05.027

3. Enhancement of fermentative volatile fatty acids production from waste activated sludge by combining sodium dodecylbenzene sulfonate and low-thermal pretreatment

Author:
Wan, Jijun; Fang, Wei; Zhang, Tao; Wen, Gang
Source:
Bioresource technology 2020 v.308 pp. 123291
ISSN:
0960-8524
Subject:
volatile fatty acids,   etc   ; Firmicutes; activated sludge; chemical oxygen demand; hydrolysis; microbial communities; sodium dodecylbenzenesulfonate; synergism;     Show all 8 Subjects
Abstract:
... This study investigated the combination of low-thermal and sodium dodecylbenzene sulfonate (SDBS) as a pretreatment method to improve the volatile fatty acids (VFA) production from waste activated sludge (WAS). The results showed that the maximum VFA yield of 320 ± 7.7 mg COD/g VS was obtained in the combined pretreatment (0.01 g SDBS/g TS + 70 °C for 60 min), which was 1.8, 1.7 and 4.0 times of t ...
DOI:
10.1016/j.biortech.2020.123291

4. Three birds with one stone: Lower volatile fatty acids (VFAs) reduction, higher phosphorus (P) removal, and lower alkali consumption via magnesium dosing after waste activated sludge (WAS) alkaline fermentation

Author:
Chen, Yun; Ruhyadi, Roby; Shen, Nan; Wu, Yuanyuan; Yan, Wang; Liang, Zhu; Huang, Jinjin; Wang, Guoxiang
Source:
Journal of cleaner production 2020 v.258 pp. 120687
ISSN:
0959-6526
Subject:
volatile fatty acids,   etc   ; activated sludge; birds; bound water; chemical oxygen demand; fermentation; hydrolysis; magnesium; phosphorus;     Show all 9 Subjects
Abstract:
... Magnesium (120 mmol/L) was dosed to investigate the effects of different methods and times on performance of waste activated sludge (WAS) alkaline fermentation. The investigation revealed that maximum soluble chemical oxygen demand (SCOD) was achieved without magnesium addition, indicating magnesium addition, regardless of dosing method or time, could constrain the sludge hydrolysis process. Ferme ...
DOI:
10.1016/j.jclepro.2020.120687

5. Continuous thermophilic hydrogen production from an enzymatic hydrolysate of agave bagasse: Inoculum origin, homoacetogenesis and microbial community analysis

Author:
Montiel-Corona, Virginia; Palomo-Briones, Rodolfo; Razo-Flores, Elías
Source:
Bioresource technology 2020 v.306 pp. 123087
ISSN:
0960-8524
Subject:
volatile fatty acids,   etc   ; acclimation; bagasse; hydrogen; hydrogen production; hydrolysates; inoculum; lignocellulose; microbial communities;     Show all 9 Subjects
Abstract:
... In this research, the performance of two thermophilic inocula of different origin on continuous hydrogen production from an enzymatic hydrolysate of agave bagasse were compared; one of them was obtained from a thermophilic reactor and the second one was taken from a mesophilic reactor and acclimated to thermophilic conditions. The acclimation process in one-step quickly established a high-performa ...
DOI:
10.1016/j.biortech.2020.123087

6. Evaluation of semi-continuous operation to hydrogen and volatile fatty acids production using raw glycerol as substrate

Author:
de Almeida Silva, Maria Cristina; Monteggia, Luiz Olinto; Alves Barroso Júnior, José Carlos; Granada, Camille Eichelberger; Giongo, Adriana
Source:
Renewable energy 2020 v.153 pp. 701-710
ISSN:
0960-1481
Subject:
volatile fatty acids,   etc   ; Clostridium; Enterobacter; biomass; fermenters; glycerol; hydrogen; hydrogen production; renewable energy sources;     Show all 9 Subjects
Abstract:
... Two fermenters were operated by semi-continuous mode with suspended biomass and glycerol at concentrations of 10 and 50 g/L to evaluate the semi-continuous operational conditions to hydrogen and volatile fatty acids production. A high hydrogen production in the semi-continuous reactors at the experiment was observed, with a drop during the test, mainly in the reactor with higher substrate concentr ...
DOI:
10.1016/j.renene.2020.01.152

7. Effect of steam explosion of oil palm frond and empty fruit bunch on nutrient composition and ruminal fermentation characteristics

Author:
Wu, Hao; Zhou, Zhenming; Yang, Yuanlong; Meng, Qingxiang
Source:
Tropical animal health and production 2020 v.52 no.3 pp. 1223-1228
ISSN:
0049-4747
Subject:
volatile fatty acids,   etc   ; Elaeis guineensis; fermentation; fruits; hemicellulose; nutrient content; rumen fermentation;     Show all 7 Subjects
Abstract:
... In this study, we evaluated the effect of steam explosion of oil palm frond (OPF) and oil palm empty fruit bunch (EFB) on nutrient composition and ruminal fermentation characteristics in vitro. The results showed that steam explosion decreased NDF (P < 0.01), ADF (P < 0.01), and hemicellulose content (P < 0.01) in OPF and EFB. Steam explosion improved the effective energy value of OPF and EFB. In ...
DOI:
10.1007/s11250-019-02117-4
PubMed:
31707684
PubMed Central:
PMC7190680

8. Glucose fermentation with biochar amended consortium: Sequential fermentations

Author:
Lu, Jia-Hsun; Chen, Chuan; Huang, Chihpin; Leu, Shao-Yuan; Lee, Duu-Jong
Source:
Bioresource technology 2020 v.303 pp. 122933
ISSN:
0960-8524
Subject:
volatile fatty acids,   etc   ; activated carbon; batch fermentation; biochar; biofilm; carbon dioxide; culture media; glucose; glycolysis; hydrogen;     Show all 10 Subjects
Abstract:
... The aim of this work was to study sequential batch fermentation of glucose with a biological consortium amended with nine different biochars or with an activated carbon. The glucose fermentation was enhanced by carbon amendment, with activated carbon being more effective than biochars as cell carriers and electron conductors between functional species. The volatile fatty acid distributions were sh ...
DOI:
10.1016/j.biortech.2020.122933

9. Optimization ofS/Fe ratio for enhanced nitrobenzene biological removal in anaerobicSystem amended withSulfide-modified nanoscale zerovalent iron

Author:
Zhang, Dejin; Li, Yang; Sun, Aiwu; Tong, Siqi; Jiang, Xinbai; Mu, Yang; Li, Jiansheng; Han, Weiqing; Sun, Xiuyun; Wang, Lianjun; Shen, Jinyou
Source:
Chemosphere 2020 v.247 pp. 125832
ISSN:
0045-6535
Subject:
volatile fatty acids,   etc   ; aniline; biodiversity; enzymes; fermentation; iron; methane; methane production; nitroaromatic compounds; nitrobenzenes; wastewater;     Show all 11 Subjects
Abstract:
... Anaerobic reduction of nitrobenzene (NB) can be efficiently enhanced bySupplementing withSulfide-modified nanoscale zerovalent iron (S-nZVI). In thisStudy,S/Fe ratio ofS-nZVI was further optimized for enhancing biological NB removal in anaerobicSystem amended withS-nZVI and inoculated by anaerobicSludge. The results indicated that the performance andStability of the coupled anaerobicSystem for NB ...
DOI:
10.1016/j.chemosphere.2020.125832

10. Particle size, inoculum-to-substrate ratio and nutrient media effects on biomethane yield from food waste

Author:
Okoro- Shekwaga, Cynthia Kusin; Turnell Suruagy, Mariana Vieira; Ross, Andrew; Camargo- Valero, Miller Alonso
Source:
Renewable energy 2020 v.151 pp. 311-321
ISSN:
0960-1481
Subject:
volatile fatty acids,   etc   ; anaerobic digestion; biogas; electricity; energy; food waste; heat; methane; methane production; particle size;     Show all 10 Subjects
Abstract:
... This study investigates the effects of particle size reduction at different inoculum-to-substrate ratios and nutrient media supplementation on the assessment of biomethane production from food waste, under batch mesophilic conditions. Two different food waste samples were used and the best method for testing biomethane potential was chosen based on their characterisation and methane yields. Result ...
DOI:
10.1016/j.renene.2019.11.028

11. Dry batch anaerobic digestion of food waste in a box-type reactor system: Inoculum preparation and reactor performance

Author:
Rico, Carlos; Montes, Jesús A.; Lobo, Amaya
Source:
Journal of cleaner production 2020 v.251 pp. 119751
ISSN:
0959-6526
Subject:
volatile fatty acids,   etc   ; acclimation; anaerobic digestion; biogas; feedstocks; food waste; inoculum; methane; methane production; slurries;     Show all 10 Subjects
Abstract:
... A box-type reactor system with liquid inoculum has been studied for the dry anaerobic digestion of food waste. The food waste was processed without any pre-treatment to remove physical impurities, neither water addition to dilute and slurry the feedstock. The experiment was carried out with inoculum to substrate ratios of 1:1 (w/w) and 0.08:1 (VS basis). Previous acclimation of liquid inoculum enh ...
DOI:
10.1016/j.jclepro.2019.119751

12. Methane yield enhancement of mesophilic and thermophilic anaerobic co-digestion of algal biomass and food waste using algal biochar: Semi-continuous operation and microbial community analysis

Author:
Zhang, Le; Li, Fanghua; Kuroki, Agnès; Loh, Kai-Chee; Wang, Chi-Hwa; Dai, Yanjun; Tong, Yen Wah
Source:
Bioresource technology 2020 v.302 pp. 122892
ISSN:
0960-8524
Subject:
volatile fatty acids,   etc   ; algae; anaerobic digestion; biochar; biomass; food waste; methane production; methanogens; microbial communities; temperature;     Show all 10 Subjects
Abstract:
... The impact of algal biochar addition on mesophilic and thermophilic anaerobic co-digestion of algal biomass and food waste was investigated with a focus on semi-continuous operations and functional microbial communities. Under batch co-digestion, the highest co-digestion synergy was observed for a mixture of 25% food waste and 75% algal biomass. During semi-continuous co-digestion of 25% food wast ...
DOI:
10.1016/j.biortech.2020.122892

13. Sustainable production of alkyl esters via thermal process in the presence of carbon black

Author:
Kwon, Eilhann E.; Jung, Jong-Min; Kim, Hyung Ju; Lee, Jechan
Source:
Environmental research 2020 v.183 pp. 109199
ISSN:
0013-9351
Subject:
volatile fatty acids,   etc   ; carbon; esterification; esters; feedstocks; gasoline; organic wastes; porous media; silica; soot; value added;     Show all 11 Subjects
Abstract:
... In this study, it is introduced a sustainable synthetic route of alkyl esters, considered value-added industrial chemicals and fuels, from volatile fatty acids (VFAs) that can potentially be generated from organic waste. In the presence of a porous carbon material, the thermally induced reaction could be conducted under an initial pressure of 1 atm. Even though the reaction was finished within <10 ...
DOI:
10.1016/j.envres.2020.109199

14. Anaerobic digestion of hazelnut (Corylus colurna) husks after alkaline pretreatment and determination of new important points in Logistic model curves

Author:
Şenol, Halil
Source:
Bioresource technology 2020 v.300 pp. 122660
ISSN:
0960-8524
Subject:
volatile fatty acids,   etc   ; Corylus colurna; alkali treatment; anaerobic digestion; hazelnuts; hulls; logit analysis; methane production;     Show all 8 Subjects
Abstract:
... In this study, anaerobic digestion (AD) of hazelnut (Corylus colurna) husks (HH) was investigated by NaOH pretreatment at 1–6% w/w concentrations. The highest methane yield was 278.45 ± 7.85 mL/g volatile solid (VS), and this was obtained in a 4% NaOH pretreated reactor. In this reactor, the methane yield increased by 162.2% compared to that in the control. The concentrations of volatile fatty aci ...
DOI:
10.1016/j.biortech.2019.122660

15. Effect of ethanol pre-fermentation on organic load rate and stability of semi-continuous anaerobic digestion of food waste

Author:
Ma, Xinxin; Yu, Miao; Song, Na; Xu, Banghua; Gao, Ming; Wu, Chuanfu; Wang, Qunhui
Source:
Bioresource technology 2020 v.299 pp. 122587
ISSN:
0960-8524
Subject:
volatile fatty acids,   etc   ; alkalinity; amino acids; ammonium nitrogen; anaerobic digestion; ethanol; food waste; microbial communities;     Show all 8 Subjects
Abstract:
... This study investigated the effects of ethanol pre-fermentation on the organic load rate (OLR) and stability of single-phase semi-continuous anaerobic digestion system of food waste. Results revealed that the pre-fermentation group tolerated higher OLR, with a maximum OLR of 5.5 g-VS·L⁻¹·d⁻¹. Moreover, the abundance of microbial community in relation to amino acid degradation in the pre-fermentati ...
DOI:
10.1016/j.biortech.2019.122587

16. A metabolic model for targeted volatile fatty acids production by cofermentation of carbohydrates and proteins

Author:
Mauricio Iglesias, Miguel; Regueira, Alberte; Bevilacqua, Riccardo; Lema, Juan Manuel; Carballa, Marta; Mauricio-Iglesias, Miguel
Source:
Bioresource technology 2020 v.298 pp. 122535
ISSN:
0960-8524
Subject:
volatile fatty acids,   etc   ; carbohydrates; fermentation; mathematical models; mixed culture; organic wastes; pH; proteins;     Show all 8 Subjects
Abstract:
... Anaerobic mixed-culture fermentations are interesting processes to valorise organic wastes by converting them to volatile fatty acids. One of the main issues is that certain operational conditions (e.g. pH or different substrate concentrations) can vary significantly the product spectrum. So far, there are no tools that take into the account the characteristic features of cofermentation processes, ...
DOI:
10.1016/j.biortech.2019.122535

17. Effect of mechanical elutriation on carbon source recovery from primary sludge in a novel activated primary tank

Author:
Wang, Xianbao; Jin, Pengkang; Zhang, Anlong; Gao, Junling; Zhang, Bo; Hou, Yinping
Source:
Chemosphere 2020 v.240 pp. 124820
ISSN:
0045-6535
Subject:
volatile fatty acids,   etc   ; bacteria; batch fermentation; carbon; chemical oxygen demand; community structure; microbial communities; mixing; sludge;     Show all 9 Subjects
Abstract:
... A novel activated primary tank (APT) with an elutriation unit was developed for recovering carbon by the fermentation and elutriation of primary sludge, and the mechanical elutriation mechanism was analysed by conducting a batch fermentation experiment to improve carbon source recovery. The results indicated that a high stirring velocity gradient could cause sludge disintegration, which could not ...
DOI:
10.1016/j.chemosphere.2019.124820

18. Effect of pH on the Anaerobic Fermentation of Fruit/Vegetables and Disposable Nappies Hydrolysate for Bio-hydrogen Production

Author:
Tsigkou, Konstantina; Tsafrakidou, Panagiota; Athanasopoulou, Sofia; Zafiri, Constantina; Kornaros, Michael
Source:
Waste and biomass valorization 2020 v.11 no.2 pp. 539-551
ISSN:
1877-2641
Subject:
volatile fatty acids,   etc   ; ethanol; fermentation; fruits; hydrogen; hydrogen production; hydrolysates; marketing; metabolites; pH; temperature; vegetables; wastes;     Show all 13 Subjects
Abstract:
... PURPOSE: The objective of this work was to optimize the anaerobic fermentation of a mixed waste stream, consisted of fruit and vegetables that have lost their marketing value and a disposable nappies’ hydrolysate. More specifically, the aim was to identify the optimal pH value for maximum hydrogen production and valuable metabolites such as volatile fatty acids and ethanol. METHODS: A wide range o ...
DOI:
10.1007/s12649-019-00854-z

19. Redox-active biochar facilitates potential electron tranfer between syntrophic partners to enhance anaerobic digestion under high organic loading rate

Author:
Wang, Gaojun; Li, Qian; Li, Yu; Xing, Yao; Yao, Gaofei; Liu, Yanzheng; Chen, Rong; Wang, Xiaochang C.
Source:
Bioresource technology 2020 v.298 pp. 122524
ISSN:
0960-8524
Subject:
volatile fatty acids,   etc   ; Methanosarcina; additives; anaerobic digestion; biochar; electron transfer; methane; methane production; microbial communities; temperature;     Show all 10 Subjects
Abstract:
... Sawdust-based biochar prepared (SDBC) at three pyrolytic temperatures were compared as additives to mesophilic anaerobic digestion (AD). SDBC prepared at 500 °C performed better in enhancing CH₄ production than other SDBCs. Analyzing the crucial electro-chemical characteristics of the SDBCs revealed that the excellent electron transfer capacity of SDBC was significant to stimulate methanogenesis p ...
DOI:
10.1016/j.biortech.2019.122524

20. Enhanced PHA Production with Mixed Cultures Using a Robust and Simple Controller

Author:
Muñoz, Gerardo; Vargas, Alejandro
Source:
Waste and biomass valorization 2020 v.11 no.1 pp. 277-290
ISSN:
1877-2641
Subject:
volatile fatty acids,   etc   ; air flow; algorithms; biomass; bioreactors; dissolved oxygen; mixed culture; polyhydroxyalkanoates;     Show all 8 Subjects
Abstract:
... PURPOSE: This work proposes the use of feedback control tools to enhance the production of bacterial polyhydroxyalkanoates (PHA) in an aerobic bioreactor fed with volatile fatty acids (VFA), by regulating the dissolved oxygen (DO) concentration at an optimal reference value and using the airflow signal behaviour to decide when to stop the reaction. METHODS: The proposed method uses a standard prop ...
DOI:
10.1007/s12649-018-0383-x