Feasibility of microalgal and macroalgal biomass co-digestion on biomethane production

The aim of this work was to evaluate the potential of ultrasound (US), alone or in combination with mild heating and/or EDTA towards reduction of As, Cd, I, and Hg content of Laminaria hyperborea. Concentrations of As, Cd, I, and Hg of 56.29, 0.596, 7340, and <0.01 mg kg−1 of dry weight, respectively, were found in L. hyperborea blades. Treatment with US at 50 °C increased approx. 2-fold the amount of As released, although did not affect significantly the content of Cd or I, as compared to control (no US) samples. Reducing the temperature to 8 °C significantly decreased the effect of US, but heating at 80 °C did not cause a significant effect as compared to treatments at 50 °C. On the other hand, treatment with 0.1 N EDTA at 50 °C enhanced the percentage of Cd released by approximately 7-fold, regardless of sonication. In the present work, the combination of US and EDTA at 50 °C for 5 min led to a significant reduction of the As (32%), Cd (52%) and I (31%) content in L. hyperborea, thus improving the product’s safety for consumers.

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Influencing mechanism of Fe2+ on biomethane production from coal

Journal of Natural Gas Science and Engineering ◽

10.1016/j.jngse.2021.103959 ◽

2021 ◽

Vol 91 ◽

pp. 103959

Author(s):

Daping Xia ◽

Song Huang ◽

Xiatong Yan ◽

Ruifu Yuan

Keyword(s):

Influencing Mechanism ◽

Biomethane Production

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

Fermentation ◽

10.3390/fermentation7010012 ◽

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.

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Investigation of microbial community structure and its potential for biomethane production by co‐digestion of cassava pulp and distillery stillage

Environmental Progress & Sustainable Energy ◽

10.1002/ep.13695 ◽

2021 ◽

Author(s):

Chonradee Witchayapong ◽

Pongdet Piromyou ◽

Pailin Boontawan ◽

Panlada Tittabutr ◽

Apichat Boontawan

Keyword(s):

Community Structure ◽

Microbial Community ◽

Microbial Community Structure ◽

Cassava Pulp ◽

Biomethane Production

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Biofuel production from bio-waste by biological and physical conversion processes

Waste Management & Research ◽

10.1177/0734242x19868513 ◽

2019 ◽

Vol 38 (1) ◽

pp. 69-77

Author(s):

Noppawan Photong ◽

Jaruwan Wongthanate

Keyword(s):

Water Hyacinth ◽

Oxygen Demand ◽

Cassava Starch ◽

Biofuel Production ◽

Conversion Process ◽

Electricity Production ◽

Biological Conversion ◽

Initial Ph ◽

Biomethane Production ◽

Product Standard

This research is focused on the feasibility of biofuel from water hyacinth mixed with cassava starch sediment by biological and physical conversion processes and the comparison of the gross electricity production in these processes. The biological conversion process produced biomethane by anaerobic digestion. The optimal conditions of biomethane production were a ratio of water hyacinth and cassava starch sediment at 25:75, initial pH of 7.5, thermophilic temperature (55 ± 2°C) and C/N ratio of 30. The maximum biomethane yield measured was 436.82 mL CH4 g chemical oxygen demand (COD)−1 and the maximum COD removal was 87.40%. The physical conversion process was bio-briquette. It was found that the ratios of water hyacinth and cassava starch sediment at 10:90, 20:80, 30:70, 40:60 and 50:50 were the best ratio of fuel properties and close to the Thai Community Product Standard, with heating values of 15.66, 15.43, 15.10, 14.88 and 14.58 MJ kg−1, respectively. Moreover, results showed that the gross electricity production of the biological conversion process (biomethane) was 3.90 kWh and the gross electricity production of the physical conversion process (bio-briquette) from the ratios of water hyacinth and cassava starch sediment at 10:90, 20:80, 30:70, 40:60 and 50:50 were 1.52, 1.50, 1.47, 1.45 and 1.42 kWh, respectively.

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