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Biogas

About: Biogas is a research topic. Over the lifetime, 28571 publications have been published within this topic receiving 498545 citations.


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Journal ArticleDOI
TL;DR: In this article, the characteristics of food waste, the biological process and biochemical reaction involved in the anaerobic digestion process, various operational parameters and classification of the AD process, and the co-digestion and pre-treatment processes could improve the FW hydrolysis rate and methane production.

175 citations

Journal ArticleDOI
TL;DR: In this article, two woody biochar, namely pinewood (PBC) and white oak biochar (WOBC), were used as additives during anaerobic digestion (AD) of WWTP sludge to enhance methane production at mesophilic and thermophilic temperatures.

175 citations

Journal ArticleDOI
TL;DR: In this article, the authors reviewed the innovations and optimizations in biogas production from the biological perspective reported by recently published patents and research works and categorized them into three different groups, i.e., upstream, mainstream, and downstream approaches.

175 citations

Journal ArticleDOI
TL;DR: Fungal-assistedmicroalgal flocculation shows significant potential for solving the major challenges facing the commercialization of microalgal biotechnology, namely the efficient and cost-effective harvesting of freshwater and seawater algal strains and enhancement of total oil production and optimization of its composition.
Abstract: The microalgal-based industries are facing a number of important challenges that in turn affect their economic viability. Arguably the most important of these are associated with the high costs of harvesting and dewatering of the microalgal cells, the costs and sustainability of nutrient supplies and costly methods for large scale oil extraction. Existing harvesting technologies, which can account for up to 50% of the total cost, are not economically feasible because of either requiring too much energy or the addition of chemicals. Fungal-assisted flocculation is currently receiving increased attention because of its high harvesting efficiency. Moreover, some of fungal and microalgal strains are well known for their ability to treat wastewater, generating biomass which represents a renewable and sustainable feedstock for bioenergy production. We screened 33 fungal strains, isolated from compost, straws and soil for their lipid content and flocculation efficiencies against representatives of microalgae commercially used for biodiesel production, namely the heterotrophic freshwater microalgae Chlorella protothecoides and the marine microalgae Tetraselmis suecica. Lipid levels and composition were analyzed in fungal-algal pellets grown on media containing alternative carbon, nitrogen and phosphorus sources from wheat straw and swine wastewater, respectively. The biomass of fungal-algal pellets grown on swine wastewater was used as feedstock for the production of value-added chemicals, biogas, bio-solids and liquid petrochemicals through pyrolysis. Co-cultivation of microalgae and filamentous fungus increased total biomass production, lipid yield and wastewater bioremediation efficiency. Fungal-assisted microalgal flocculation shows significant potential for solving the major challenges facing the commercialization of microalgal biotechnology, namely (i) the efficient and cost-effective harvesting of freshwater and seawater algal strains; (ii) enhancement of total oil production and optimization of its composition; (iii) nutrient supply through recovering of the primary nutrients, nitrogen and phosphates and microelements from wastewater. The biomass generated was thermochemically converted into biogas, bio-solids and a range of liquid petrochemicals including straight-chain C12 to C21 alkanes which can be directly used as a glycerine-free component of biodiesel. Pyrolysis represents an efficient alternative strategy for biofuel production from species with tough cell walls such as fungi and fungal-algal pellets.

175 citations

Journal ArticleDOI
TL;DR: In this paper, two two-stage systems, one consisting of a solid-bed reactor for hydrolysis/acidification connected to an upflow anaerobic sludge blanket methanogenic reactor, and the other consisting of an up-flow methanogenous reactor packed with wheat straw biofilm carriers, were investigated with regard to hydrolytic enzymes and methane production during mesophilic anaerob digestion of solid potato waste.

175 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20231,542
20223,366
20211,883
20202,203
20192,237
20182,221