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Methane Production from Farmed Rainbow Trout Byproducts by Anaerobic Digestion in Morocco

Essalhi Fatima, Bengueddour Rachid

Ecological Engineering & Environmental Technology

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2023

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Vol. 24, iss. 2

45--54

EN

Fish are a staple in human nutrition because of their great nutritional and dietetic value. The processing stages of these fish before being sold generates an important quantity of byproducts (head, viscera, skeleton, fins, scales, tail, and skin). This study aims to determine the methane production, methanogenic potential and the percentage of volatile solids removed by the anaerobic digestion process. The experiment was carried out at mesophilic conditions in a Continuous Stirred-Tank Reactor (CSTR) with a discontinuous feeding mode (batch). The results obtained showed that the byproducts of farmed rainbow trout have a maximum methane production 1176 Nml whose methanogenic potential is 206.68 Nml/gVS with a biodegradability equal to 57.95%. For the kinetic modeling, four models were applied for an adequate fit of the experimental results (first order, MGompertz, transfererence function, and logistic function). The production of methane closest to the experimental results is that estimated by the logistic function with a methanogenic potential of 212.21 Nml/gVS whose correlation coefficient R2= 0.9870 and a very low percentage of error (1.18%), also the MGompertz model presented results adapted to those of the experiment with a methanogenic potential equal to 223.61 Nml/gVS (R2= 0.9889 and %error = 2.95); This confirms that these two kinetic models are the most suitable for this type of substrate.

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Assessment of the Biogas Yield of White Mustard (Sinapis alba) Cultivated as Intercrops

Słomka Alicja, Wójcik Oliveira Katarzyna

Journal of Ecological Engineering

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2021

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Vol. 22, nr 7

67--72

EN

Popularization of intercrops in agriculture, resulting in an increased sequestration of carbon dioxide may bring additional benefits, becoming a source of biomass constituting a feedstock for biogas production. The residue formed in the course of biogas production, i.e. digestate, is also an alternative or a valuable supplement for mineral fertilizers necessary to maintain the proper condition of the agricultural soil. Therefore, the application of substrates from the intecrop biomass enables to improve the quality of soil, without sacrificing the main crop, by preventing the leaching of nutrients; it also reduces the risk of plant diseases, has a significant influence on diversification of energy sources, and contributes to solving the issue of excessive greenhouse gases emission. The aim of the work was to investigate the biogas and methanogenic potential of white mustard (Sinapis alba) and estimate the biogas efficiency of its biomass (the above-ground part) per hectare of arable land. The studies were conducted on the plants cultivated on experimental plots located in Emilianów and Wierzbica (Lubelskie Voivoideship). The cultivation of plants was conducted simultaneously, as stubble crop. The studies indicated a significant quantitative and qualitative differentiation of plant biomass collected from particular plots. The C:N ratio, which constitutes the basic factors governing the correct course of methane fermentation, in the case of the shoot biomass of the considered plants, ranged from 13.5:1 to 19.9:1, depending on the location. The biomass efficiency of mustard biomass ranged from 0.6 t d.m. ha-1 to 0.8 t d.m. ha-1, whereas its biogas potential amounted to 350–440 m3 t-1 d.m. Therefore, one hectare of intercrop mustard yields 264–280 m3 of biogas and the produced digestate can be recirculated to the soil, increasing the amount of biogenic substances and enriching it with humic substances.

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Potencjał metanogenny biomasy beztlenowej : doświadczenia laboratoryjne i techniczne

Cimochowicz-Rybicka M., Nickel K., Przytulski M., Podewils W.

Przemysł Chemiczny

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2015

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T. 94, nr 9

1500-1502

PL

Przedstawiono wyniki badań laboratoryjnych prowadzonych w celu określenia potencjału metanogennego osadu przefermentowanego poddanego dezintegracji ultradźwiękowej, wykorzystanej jako proces intensyfikujący beztlenową przeróbkę osadów ściekowych. Wyniki prac laboratoryjnych zostały potwierdzone rezultatami eksploatacji w pełnej skali w rzeczywistej oczyszczalni ścieków w Dąbrowie Górniczej. Testy respirometryczne osadów przefermentowanych w wydzielonych komorach fermentacyjnych i poddanych dezintegracji wykazały, że proponowany sposób polepszenia efektywności produkcji gazu fermentacyjnego prowadzi do ok. 20-proc. zwiększenia odzysku metanu z tej frakcji osadu (uprzednio uznawanej za frakcję osadową nie mającą potencjału wytworzenia metanu). Przedstawiono specyficzne problemy związane z przenoszeniem wyników badań laboratoryjnych do pełnej skali technicznej (np. w zakresie energii właściwej rozkładu). Zaproponowana metodyka określania możliwości zwiększenia odzysku gazu została zweryfikowana pozytywnie w obiekcie technicznym. Zarówno badania laboratoryjne, jak i pomiary w warunkach technicznych poparte analizą mikroskopową wykazały, że 20-proc. wzrost produkcji gazu poprzez dezintegrację ultradźwiękową może zostać osiągnięty bez potrzeby całkowitej destrukcji ścian komórek.

EN

Digested sludge was subjected to ultrasonic disintegration to intensify its anaerobic fermentation under lab. And full-scale conditions. An about 20% increase in MeH recovery from the sludge without any methanogenic potential. The lab. results were used for the planning the full-tech. scale exps. and improving the operational efficiency of the wastewater treatment plant.