scholarly journals The impact of crude glycerol from biodiesel production and its trace element content on biomethane production in a batch experiment: modelling as a step towards impartial routine comparison of results

2021 ◽  
pp. 11-24
Author(s):  
Sabina Kolbl Repinc ◽  
Leon Deutsch ◽  
Dragiša Savić ◽  
Franci Steinman ◽  
Bojana Danilović ◽  
...  
Keyword(s):  
Trace Element ◽  
Crude Glycerol ◽  
Biogas Production ◽  
Biodiesel Production ◽  
Batch Experiment ◽  
Inorganic Salts ◽  
Lag Phase ◽  
Daily Routine ◽  
Negative Effects ◽  
Biomethane Production

In this study, crude glycerol from the biodiesel industry was tested as a co-substrate in biogas production. To investigate the influence of crude glycerol and the underlying trace element (TE) content on the efficiency of biomethane production, a batch experiment using Automatic Methane Potential Test System (AMPTS II) was carried out. The single addition of crude glycerol significantly contributed only to the total content of K (14.4%), Si (17.3%), and P (11.6%), whereas the contributions of other metals were within the range of other substrates. The addition of crude glycerol increased biomethane production, however, its utilization beyond 1% of total volume resulted in prolonged lag phase and final cessation of biomethane production. The negative effects of inorganic salts present in crude glycerol were reflected in progressively diminishing parts of glycerol and methanol being utilized in its anaerobic digestion, posing serious problems for daily routine use. A nonlinear least square regression analysis was performed to fit the Gompertz, Logistic, Transfer, and Richards models to biomethane production. The most suitable model was the Richards model, exhibiting the best fit to the experimental curves for complex substrates. Glycerol fractions remaining after biodiesel production have to be pre-tested for their negative effects on the content of TEs and inorganic salts, lag phase in biogas production, before they are used as co-substrates in biogas production phase.

Anaerobic treatment of crude glycerol from biodiesel production

2015 ◽  
Vol 72 (8) ◽  
pp. 1383-1389 ◽  
Author(s):  
M. M. Nakazawa ◽  
W. R. S. Silva Júnior ◽  
M. T. Kato ◽  
S. Gavazza ◽  
L. Florencio
Keyword(s):  
Crude Glycerol ◽  
Denaturing Gradient Gel Electrophoresis ◽  
Biogas Production ◽  
Oxygen Demand ◽  
Experimental Period ◽  
Anaerobic Treatment ◽  
Biodiesel Production ◽  
Uasb Reactor ◽  
Anaerobic Sludge ◽  
Reactor Performance

In this study, we evaluated the use of an up-flow anaerobic sludge blanket (UASB) reactor to treat crude glycerol obtained from cottonseed biodiesel production. The laboratory-scale UASB reactor (7.0 L) was operated at ambient temperature of 26.5°C with chemical oxygen demand (COD) concentrations between 0.5 and 8.0 g/L. The volatile fatty acid contents, pH, inorganic salt contents and biogas production were monitored during a 280-day experimental period. Molecular biology techniques were used to assess the microbial diversity in the bioreactor. The reactor achieved COD removal efficiencies of up to 92% except during one phase when the efficiency decreased to 81%. Biogas production remained stable throughout the experimental period, when the fraction converted to methane reached values as high as 68%. The profile of the denaturing gradient gel electrophoresis (DGGE) bands suggested slight changes in the microbial community during reactor operation. The overall results indicated that the crude glycerol from biodiesel production can serve as a suitable substrate for anaerobic degradation with a stable reactor performance and biogas production as long as the applied organic loads are up to 8.06 kg COD/m3·d.

scholarly journals Utilization of Biodiesel By-Products for Biogas Production

2011 ◽  
Vol 2011 ◽  
pp. 1-15 ◽  
Author(s):  
Nina Kolesárová ◽  
Miroslav Hutňan ◽  
Igor Bodík ◽  
Viera Špalková
Keyword(s):  
Anaerobic Degradation ◽  
Crude Glycerol ◽  
Biogas Production ◽  
Anaerobic Treatment ◽  
Biodiesel Production ◽  
Oil Cakes ◽  
Different Types ◽  
Biodiesel Purification ◽  
Washing Water ◽  
By Products

This contribution reviews the possibility of using the by-products from biodiesel production as substrates for anaerobic digestion and production of biogas. The process of biodiesel production is predominantly carried out by catalyzed transesterification. Besides desired methylesters, this reaction provides also few other products, including crude glycerol, oil-pressed cakes, and washing water. Crude glycerol or g-phase is heavier separate liquid phase, composed mainly by glycerol. A couple of studies have demonstrated the possibility of biogas production, using g-phase as a single substrate, and it has also shown a great potential as a cosubstrate by anaerobic treatment of different types of organic waste or energy crops. Oil cakes or oil meals are solid residues obtained after oil extraction from the seeds. Another possible by-product is the washing water from raw biodiesel purification, which is an oily and soapy liquid. All of these materials have been suggested as feasible substrates for anaerobic degradation, although some issues and inhibitory factors have to be considered.

Anaerobic treatment of biodiesel by-products in a pilot scale reactor

2011 ◽  
Vol 65 (4) ◽  
Author(s):  
Nina Kolesárová ◽  
Miroslav Hutňan ◽  
Viera Špalková ◽  
Rastislav Kuffa ◽  
Igor Bodík
Keyword(s):  
Crude Glycerol ◽  
Biogas Production ◽  
Rapeseed Meal ◽  
Pilot Scale ◽  
Anaerobic Treatment ◽  
Biodiesel Production ◽  
Term Operation ◽  
Volumetric Loading ◽  
By Products

AbstractIn this work, long-term operation of a pilot scale mixed anaerobic reactor processing crude glycerol and rapeseed meal is discussed. These materials are generated as by-products of biodiesel production. Mixed reactor was operated under mesophilic conditions for the period of 654 days. Total cumulative production of biogas reached 379 m3 (at atmospheric pressure and ambient temperature). Maximum volumetric loading achieved during the operation was 2.17 kg m−3 d−1 for the crude glycerol dose of 2 L. When dosing crude glycerol as a single substrate, average specific production of biogas of 0.76 m3 per L of the g-phase was achieved. The lack of nutrients in the g-phase had to be compensated by an addition of ammonium nitrogen in the form of urea into the reactor. Long term processing of crude glycerol demonstrated that accumulation of dissolved inorganic salts in the reactor can lead to inhibition of the methanogenic activity of microorganisms, causing breakdown of the system. Co-fermentation of crude glycerol with rapeseed meal provided stable biogas production and it was shown to be a feasible way of anaerobic degradation of these substrates. At the maximum volumetric load of 1.33 kg m−3 d−1 (500 mL of g-phase and 500 g of rapeseed meal), the average biogas production reached 0.58 m3 d−1.

الإمام المصلح عبد الحميد بن باديس: حياته وجهوده التربوية Reformer Imam Abdal-hamid ibn Badis: His Life and Educational Reforms

2015 ◽  
Vol 12 (1) ◽  
pp. 105-152
Author(s):  
باي زكوب عبد العالي ◽  
سوهيرين محمد صوليحين
Keyword(s):  
Twentieth Century ◽  
Educational Reforms ◽  
Daily Routine ◽  
Journalism Education ◽  
Negative Effects ◽  
Educational Approach ◽  
Political Economic ◽  
Difficult Times

الملخّصيعدّ عبد الحميد بن باديس أحد العلماء الجزائريين المبرزين بالإصلاح الاجتماعي والدّيني والسّياسي والتربوي، عاش خمسين سنة في القرن العشرين الميلادي، حيث كانت ولادته سنة 1889م، وكانت وفاته سنة 1940م، ولقد فرض الواقع الجزائري إبّان فترة الاحتلال الفرنسي الذي كان يسعى إلى طمس ثوابت الأمّة الجزائرية، وخرق تاريخها، وهُويّتها، وثقافتها، ووحدتها الدينيّة، واللّغوية على ابن باديس أن يسلك نهج التربية والتعليم، قاصداً بذلك مواجهة الاحتلال الفرنسي الغاشم من خلال عدّة جبهات ومجالات كمثل مجال الصحافة، ومجال التربية والتعليم، ومجال الجمعيات، ومجال السياسة وغير ذلك، يهدف هذا البحث إلى إبراز دور عبد الحميد بن باديس في النّهوض بالأمّة الجزائريّة نحو تربيّة أفضل، وحياة أسعد، فيبدأ أوّلاً وبشكل موجز، بالتعرّف على الفترة الصعبة التي عايشها ابن باديس والمتمثلة في فترة الاحتلال الفرنسي الغاشم، وآثاره السلبية على الصعيد السياسي والاقتصادي والاجتماعي والثقافي والديني الجزائري وقتذاك، ثم يقوم ثانياً بتسليط الضّوء على حياة ابن باديس وتكوينه العلمي ورحلاته الداخلية وأسفاره الخارجية؛ ثم يسعى ثالثاً وبتعمّق، التعرّف على أعمال ابن باديس الاجتماعيّة وجهوده التربويّة التي أخذت حظّاً وافراً من حياته اليومية، والتي تركّزت على منبرين رئيسين، هما: منبر الصّحافة، ومنبر التربيّة والتعليم.الكلمات المفتاحيّة: الإمام عبد الحميد بن باديس، الاحتلال الفرنسي، التربية، الجزائر، الإصلاح.             AbstractImÉm ‘Abd al-×amÊd ibn BÉdÊs is an Algerian scientist, and eminent social, religious, political and educational reformer. He lived fifty years in the twentieth century. He was born in 1889 and died in 1940, and lived during the French occupation that attempted to distort and undermine the foundations of the Algerian nation by destroying its history, identity, culture, and religious and linguistic unity. Ibn BÉdÊs pursued an educational approach to face the brutal French occupation on several fronts, including journalism, education, civil associations, politics, etc. This paper highlights the role of ‘Abd al-×amÊd ibn BÉdÊs in the advancement of the Algerian nation toward better education and a happier life. The paper begins with a brief canvas of the difficult times in which Ibn BÉdÊs lived, and the negative effects of the brutal French occupation from political, economic, social, cultural and religious angles, besides highlighting the life of Ibn BÉdÊs, his education and his local and international travels. The focus of this research is an in-depth examination of Ibn BÉdÊs’ social and educational efforts that consumed much of his daily routine: journalism, and education.Keywords: ImÉm ‘Abd al-×amÊd ibn BÉdÊs, the French Occupation, Education, Algeria, Reform.

scholarly journals Influence of the Heating Method on the Efficiency of Biomethane Production from Expired Food Products

Fermentation ◽  
2021 ◽  
Vol 7 (1) ◽  
pp. 12
Author(s):  
Joanna Kazimierowicz ◽  
Marcin Zieliński ◽  
Marcin Dębowski
Keyword(s):  
Biogas Production ◽  
Food Products ◽  
Organic Load ◽  
Organic Substrates ◽  
Methane Fermentation ◽  
Anaerobic Reactors ◽  
Convection Heating ◽  
Load Rate ◽  
Biomethane Production ◽  
Positive Effect

The aim of the study was to determine the effect of heating with microwave electromagnetic radiation (EMR) on the efficiency of the methane fermentation (MF) of expired food products (EFP). The research was inspired by the positive effect of EMR on the production of biogas and methane from different organic substrates. The experiment was carried out on a laboratory scale in fully mixed, semi-continuous anaerobic reactors. The technological conditions were as follows: temperature, 35 ± 1 °C; organic load rate (OLR), 2.0 kgVS·m−3∙d−1; and hydraulic retention time (HRT), 40 days. The source of the EMR was a magnetron (electric power, 300 W). There was no statistically significant influence of the use of EMR on the achieved technological effects of MF. The efficiency of biogas production was 710 ± 35 dm3·kgVS−1 in the variant with EMR and 679 ± 26 dm3·kgVS−1 in the variant with convection heating (CH). The methane contents were 63.5 ± 2.4% (EMR) and 62.4 ± 4.0% (CH), and the cumulative methane production after 40 days was 271.2 and 288.6 dm3CH4, respectively.

scholarly journals Digestible energy of crude glycerol for pacu and silver catfish

2014 ◽  
Vol 44 (8) ◽  
pp. 1448-1451 ◽  
Author(s):  
Rafael Ernesto Balen ◽  
Patrick Nereu Tetu ◽  
Robie Allan Bombardelli ◽  
Paulo Cesar Pozza ◽  
Fábio Meurer
Keyword(s):  
Fish Species ◽  
Crude Glycerol ◽  
Energy Content ◽  
Biodiesel Production ◽  
Native Fish ◽  
Neotropical Fish ◽  
Digestible Energy ◽  
Silver Catfish ◽  
Glycerol Utilization ◽  
Good Potential

The increase in global biodiesel production is originating a glycerol surplus, which has no defined destination. An alternative to overcome this problem is its use as energy source in animal feeding. In Brazil, Pacu (Piaractus mesopotamicus) is one of the most farmed native fish species, whereas Silver catfish (Rhamdia quelen) is suitable for production in subtropical region. Considering little knowledge about crude glycerol utilization in feeds for Neotropical fish species, it was evaluated the apparent digestibility coefficients (ADCs) for energy of crude glycerol for P. mesopotamicus and R. quelen. The digestibility and digestible energy content of crude glycerol can be considered excellent even when compared to energy of common ingredients such as maize and wheat, presenting 0.97 and 0.89 of energy ADCs, and 15.2 and 13.95MJ kg-1 of digestible energy for Pacu and Silver catfish, respectively. In conclusion, crude glycerol is an energetic ingredient with good potential in Brazilian native fish diets.

Trace element supplementation in the biogas production from wheat stillage – Optimization of metal dosing

2014 ◽  
Vol 168 ◽  
pp. 80-85 ◽  
Author(s):  
Thomas Schmidt ◽  
Michael Nelles ◽  
Frank Scholwin ◽  
Jürgen Pröter
Keyword(s):  
Trace Element ◽  
Biogas Production

scholarly journals Waste Conversion into a Sweetener—Development of an Innovative Strategy for Erythritol Production by Yarrowia lipolytica

2020 ◽  
Vol 12 (17) ◽  
pp. 7122
Author(s):  
Ludwika Tomaszewska-Hetman ◽  
Waldemar Rymowicz ◽  
Anita Rywińska
Keyword(s):  
Yarrowia Lipolytica ◽  
Crude Glycerol ◽  
Low Cost ◽  
Corn Steep Liquor ◽  
Culture Broth ◽  
Biodiesel Production ◽  
Innovative Strategy ◽  
Simple Medium ◽  
Low Cost Strategy ◽  
Steep Liquor

The study proposed the innovative low-cost strategy for erythritol production by Yarrowia lipolytica through developing a simple medium based on industrial waste by-products and a natural method for culture broth purification. Results obtained proved that corn steep liquor might successfully replace traditional sources of nitrogen and other nutrients without compromising activities of the enzymes responsible for erythritol production and its production level. As a consequence, a production process was performed where Y. lipolytica A-6 was able to produce 108.0 g/L of erythritol, with a production rate of 1.04 g/Lh and a yield of 0.45 g/g of the medium containing exclusively 220 g/L of crude glycerol derived from biodiesel production and 40 g/L of corn steep liquor. Moreover, a comparable concentration of erythritol (108.1 g/L) was obtained when a part of crude glycerol was exchanged for the crude fraction of fatty acids in the two-steps process. Next, the collected post-fermentation broths were used in the culture with Y. lipolytica Wratislavia K1 for natural purification. The process resulted in a high increase of erythritol selectivity from 72% to 97% and in the production of 22.0 g/L of biomass with 40.4% protein content, which enables its use as an attractive animal feedstuff.

scholarly journals The effect of the nitrogen source type on the growth and consumption of crude glycerol by Streptomyces hygroscopicus CH-7

2021 ◽  
Vol 10 (1) ◽  
pp. 41-45
Author(s):  
Slavica Ilić ◽  
Jovan Ćirić ◽  
Gordana Gojgić-Cvijović
Keyword(s):  
Amino Acids ◽  
Sunflower Oil ◽  
Crude Glycerol ◽  
Biomass Concentration ◽  
Nitrogen Sources ◽  
Biodiesel Production ◽  
Streptomyces Hygroscopicus ◽  
Basic Medium ◽  
Source Type ◽  
Glycerol Consumption

In this paper we studied the effect of different amino acids (arginine, tryptophan, tyrosine, and phenylalanine) as nitrogen sources on the growth of actinomycete Streptomyces hygroscopicus CH-7 and the consumption of crude glycerol, obtained as a by-product in the biodiesel production from sunflower oil. The highest biomass concentration (9.5 g/L) was achieved using the basic medium and the medium with tryptophan (9.2 g/L), while the crude glycerol consumption was the highest in the basic medium (5.9 mg/mL) and the medium with phenylalanine (3.3 mg/mL).

scholarly journals The feasibility of trace element supplementation for stable operation of wheat stillage-fed biogas tank reactors

2011 ◽  
Vol 64 (2) ◽  
pp. 320-325 ◽  
Author(s):  
J. Gustavsson ◽  
B. H. Svensson ◽  
A. Karlsson
Keyword(s):  
Trace Element ◽  
Hydraulic Retention Time ◽  
Loading Rate ◽  
Biogas Production ◽  
Organic Loading Rate ◽  
Stable Operation ◽  
Organic Loading ◽  
Process Stability ◽  
Volatile Solids ◽  
High Sulfate

The aim of this study was to investigate the effect of trace element supplementation on operation of wheat stillage-fed biogas tank reactors. The stillage used was a residue from bio-ethanol production, containing high levels of sulfate. In biogas production, high sulfate content has been associated with poor process stability in terms of low methane production and accumulation of process intermediates. However, the results of the present study show that this problem can be overcome by trace element supplementations. Four lab-scale wheat stillage-fed biogas tank reactors were operated for 345 days at a hydraulic retention time of 20 days (37 °C). It was concluded that daily supplementation with Co (0.5 mg L−1), Ni (0.2 mg L−1) and Fe (0.5 g L−1) were required for maintaining process stability at the organic loading rate of 4.0 g volatile solids L−1 day−1.

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