scholarly journals Inhibitors of the methane fermentation process with particular emphasis on the microbiological aspect: A review

2020 ◽  
Vol 8 (5) ◽  
pp. 1880-1897 ◽  
Author(s):  
Małgorzata Czatzkowska ◽  
Monika Harnisz ◽  
Ewa Korzeniewska ◽  
Izabela Koniuszewska
Keyword(s):  
Fermentation Process ◽  
Methane Fermentation ◽  
Microbiological Aspect

INVESTIGATION OF ANAEROBIC MICROBES POTENCIALLY CONTRIBUTING TO OCTADECANE DEGRADATION IN METHANE FERMENTATION PROCESS

2019 ◽  
Vol 75 (7) ◽  
pp. III_145-III_151
Author(s):  
Akinori IGUCHI ◽  
Yuya KANO ◽  
Yuki IKARASHI ◽  
Ayaka KAINUMA ◽  
Saori HORI ◽  
...  
Keyword(s):  
Fermentation Process ◽  
Methane Fermentation

A dynamic simulation of methane fermentation process receiving heterogeneous food wastes and modelling acidic failure

2015 ◽  
Vol 18 (2) ◽  
pp. 239-247 ◽  
Author(s):  
Anh Van Ngo ◽  
Ha Thi Nguyen ◽  
Chieu Van Le ◽  
Rajeev Goel ◽  
Mitsuharu Terashima ◽  
...  
Keyword(s):  
Dynamic Simulation ◽  
Fermentation Process ◽  
Food Wastes ◽  
Methane Fermentation

scholarly journals Biogas production in the methane fermentation of excess sludge oxidized with Fenton’s reagent

2019 ◽  
Vol 116 ◽  
pp. 00104
Author(s):  
Iwona Zawieja ◽  
Kinga Brzeska
Keyword(s):  
Fermentation Process ◽  
Biogas Production ◽  
Process Conditions ◽  
Oh Radicals ◽  
Fenton’S Reagent ◽  
Iron Ions ◽  
Fenton Reagent ◽  
Excess Sludge ◽  
Methane Fermentation ◽  
Fenton's Reagent

The advanced oxidation processes (AOPs) play an important role in the degradation of hardly decomposable organic pollutants. AOPs methods rely on the production of highly reactive hydroxyl OH• radicals. The aim of the conducted research was to intensify biogas production in the methane fermentation process of excess sludge subjected to the process of deep oxidation with Fenton's reagent. In the process of oxidation of sewage sludge with the Fenton reagent, doses of iron ions in the range 0.02–0.14 g Fe2+/g TS (total solids) were used Hydrogen peroxide was measured in the proportions 1: 1–1:10 in relation to the mass of iron ions. The basic substrate of the study was excess sludge. In the case of excess sludge oxidation with the use of Fenton's reagent, the most favorable process conditions were considered to be the dose of iron ions 0.08 g Fe2+/g d.m. and a Fe2+: H2O2 ratio of 1:5. As a result of subjecting the excess sludge to disintegration with the Fenton reagent in the above-mentioned dose, with respect to the fermentation process of unprocessed sludge, about two-fold increase in the digestion degree of excess sludge and about 35% increase of the biogas yield was obtained.

scholarly journals Effects of Methane Fermentation on Spectral Properties of Fulvic Acid Extracted from Peat through Liquid Acid Precipitation

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Li-Tong Ma ◽  
Ya-Nan Lu ◽  
Ya-Xiong Wang
Keyword(s):  
Fulvic Acid ◽  
Spectral Properties ◽  
Fermentation Process ◽  
Acid Precipitation ◽  
Alkali Solution ◽  
Precipitation Method ◽  
Methane Fermentation ◽  
Liquid Acid ◽  
Vis Spectroscopy ◽  
Benzene Rings

The effects of acid precipitation with different liquid acids on spectral properties of fulvic acid extracted from peat was studied to select the most appropriate liquid acid for the acid precipitation step of the alkali solution acid precipitation method, and the new process mechanism of peat utilization by coupling methane fermentation and extraction of fulvic acid was analyzed. The alkali solution acid precipitation method was adopted to extract fulvic acid from the methane-fermented group and methane-unfermented group. Different liquid acids were used to conduct acid precipitation during the extraction. And then, the characterizations of fulvic acid samples were conducted through Fourier infrared spectroscopy, UV-Vis spectroscopy, and fluorescence spectroscopy. The yield and content of fulvic acid decreased significantly after methane fermentation. During the methane fermentation process, some fulvic acid was consumed and utilized by microorganisms to promote the methane fermentation process, resulting both in the decrease of methyl, hydroxyl, and ether bonds and in the increase of methylene, carbonyl, conjugated double bond, benzene rings, and other groups. The E4/E6 ratio shows that the E4/E6 ratio of fulvic acid was decreased after methane fermentation, and the fermentation consumed the functional group with simpler structure such as aliphatic chain hydrocarbon of fulvic acid while the structure with a higher degree of aromatization and conjugate cannot be consumed. When conducting acid precipitation with different liquid acids, the yield of fulvic acid was the highest through acid precipitation with phosphoric acid. The fulvic acid obtained through acid precipitation with nitric acid has a higher content, more benzene rings, and the highest degree of aromatization.

scholarly journals The usefulness of sugar beets for biogas production in relations of the storage time and sugar content

2018 ◽  
Vol 44 ◽  
pp. 00114 ◽  
Author(s):  
Natalia Mioduszewska ◽  
Mariusz Adamski ◽  
Anna Smurzyńska ◽  
Jacek Przybył ◽  
Krzysztof Pilarski
Keyword(s):  
Sugar Beet ◽  
Storage Time ◽  
Fermentation Process ◽  
Biogas Production ◽  
Sugar Content ◽  
Storage Period ◽  
Methane Fermentation ◽  
Sugar Beets ◽  
Biogas Yield

The aim of the study was to evaluate the usefulness of sugar beet for biogas production, taking into account the duration time of storage and sugar content in the roots. The research has included analysis of methane and biogas yield of sugar beet. The relations between the sugar content in the roots and the length of storage period and the course of the methane fermentation process were determined. Sugar beets with sugar content of 17.6% and 19.6% were used for this experiment. In order to analyse the fermentation process, the fresh beets and the beets stored in flexible, hermetic tanks in the period of 43 and 89 days were used. Based on the analysis of the obtained results, it was found that the sugar content and the storage time of sugar beet roots can differentiate the production of biomethane and that it influences the methane fermentation process and the quality of the produced biogas.

scholarly journals Treatment of dairy wastewater in UASB-UF system

2018 ◽  
Vol 44 ◽  
pp. 00087 ◽  
Author(s):  
Anna Kwarciak-Kozłowska ◽  
January Bień
Keyword(s):  
Organic Pollutants ◽  
Fermentation Process ◽  
Dairy Industry ◽  
Dairy Wastewater ◽  
Uasb Reactor ◽  
Treatment Efficiency ◽  
Methane Fermentation ◽  
Ultrafiltration Process ◽  
Raw Wastewater

The examinations concerned determination of the treatment efficiency of wastewater form dairy industry using the system which combines methane fermentation with ultrafiltration process. The study attempted to determine the effect of HRT and OLR on the degree of biodegradation of contaminants contained in the sludge examined and on the quality and amount of biogas. The anaerobic process obtained a considerable degree of the removal of organic pollutants from raw wastewater designated as COD (73.8%), BOD (81.2%) and TOC (76%). The concentrations of COD and BOD were 1053 mg/dm3 and 329 mg/dm3, respectively. The value of TOC reached a level of 288 mg/dm3. Generated biogas in the methane fermentation process of wastewater from dairy wastewater was characterized by high methane content (82 % vol.). In the final part of the experiment, the UF process was used in order to posttreating effluent from UASB reactor. During the UF process, COD, BOD and TOC parameters were removed at 72%, 63% and 67%, respectively.

Enhanced bio-energy recovery in a two-stage hydrogen/methane fermentation process

2009 ◽  
Vol 59 (11) ◽  
pp. 2137-2143 ◽  
Author(s):  
M. J. Lee ◽  
J. H. Song ◽  
S. J. Hwang
Keyword(s):  
Hydrogen Production ◽  
Fermentation Process ◽  
Continuous Production ◽  
Strong Acid ◽  
Treatment Method ◽  
Engineering System ◽  
Production Rates ◽  
Two Stage ◽  
Methane Fermentation ◽  
Pre Treatment

A two-stage hydrogen/methane fermentation process has emerged as a feasible engineering system to recover bio-energy from wastewater. Hydrogen-producing bacteria (HPB) generate hydrogen from readily available carbohydrates, and organic acids produced during the hydrogen fermentation step can be degraded to generate methane in the following step. Three strong acids, HCl, H2SO4, and HNO3, were tested to determine the appropriate pre-treatment method for enhanced hydrogen production. The hydrogen production rates of 230, 290, and 20 L/kg-glucose/day was observed for the sludge treated with HCl, H2SO4, and HNO3, respectively, indicating that the acid pre-treatment using either HCl or H2SO4 resulted in a significant increase in hydrogen production. The fluorescent in situ hybridization method indicated that the acid pre-treatment selectively enriched HPB including Clostridium sp. of cluster I from inoculum sludge. After hydrogen fermentation was terminated, the sludge was introduced to a methane fermentation reactor. This experiment showed methane production rates of 100, 30, and 13 L/kg-glucose/day for the sludge pre-treated with HCl, H2SO4, and HNO3, respectively, implying that both sulfate and nitrate inhibited the activity of methane-producing bacteria. Consequently, the acid pre-treatment might be a feasible option to enhance biogas recovery in the two-stage fermentation process, and HCl was selected as the optimal strong acid for the enrichment of HPB and the continuous production of methane.

The Possibility of Using Macroalgae Biomass from Natural Reservoirs as a Substrate in the Methane Fermentation Process

2014 ◽  
Vol 12 (9) ◽  
pp. 970-977 ◽  
Author(s):  
Marcin Dębowski ◽  
Marcin Zieliński ◽  
Magdalena Rokicka ◽  
Karolina Kupczyk
Keyword(s):  
Fermentation Process ◽  
Methane Fermentation

A Peculiar Stimulatory Effect of Acetic Acid on Ethanol Fermentation of Saccharomyces cerevisiae

2020 ◽  
Vol 14 (3) ◽  
pp. 376-383
Author(s):  
Jianhua Zhang ◽  
Xinchao Yang ◽  
Ke Wang ◽  
Huijun Wang ◽  
Hongguang Xue ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Ethanol Fermentation ◽  
Fermentation Process ◽  
Methane Fermentation ◽  
Energy Factors ◽  
Low Concentrations ◽  
Dry Cell Weight ◽  
Intracellular Energy ◽  
Positive Effect ◽  
Dry Cell

In the integrated ethanol-methane fermentation process, acetic acid was accumulated once the process runs badly. Ethanol production per DCW (dry cell weight) was increased when low concentrations of acetic acid was present, where glycerol yields significantly decreased. To explain it, we monitored intracellular energy factors (ATP, ADP and AMP) and cofactors (NAD+, NADH and NADP) at pH 4.5. In the presence of 60 mM acetic acid at pH 4.5, ATP per unit DCW increased by 47.52% compared to the control, while NADH per unit DCW decreased by 38.64%. Furthermore, in the presence of 90 mM acetic acid, the trehalose per unit DCW increased by 55.81% compared to the control. In addition, the fluorescence intensity of membrane potential increased along with the increase of acetic acid. So the positive effect of acetic acid on ethanol fermentation made the integrated process more applied.

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