Search results for "Bioga"
showing 10 items of 163 documents
Tecniche di upgrade del biogas a biometano.
2018
Il biogas prodotto dalla digestione anaerobica (AD) a partire da matrici organiche, sia in reattori controllati (digestori) che da discariche controllate, è costituito principalmente da metano, CH4 (50÷70%) e anidride carbonica, CO2 (30÷50%). Il contenuto relativo di CH4 e CO2 nel biogas dipende principalmente dalla natura del substrato e dal pH nella massa in digestione. Oltre a questi due, il biogas contiene, inoltre, quantità minori di altri composti, come l'azoto (0÷3%), il vapore acqueo (5÷10%), l’ossigeno (0÷1%), l’idrogeno solforato (0÷10.000 ppmv), che è prodotto dalla riduzione del solfato contenuto in alcuni rifiuti, l’ammoniaca, proveniente prevalentemente da idrolisi di material…
Produzione e valorizzazione del biogas nei processi di digestione anaerobica
2015
I processi di digestione anaerobica di matrici organiche, seppure necessitino di una impiantistica complessa e di una elevata competenza degli operatori, contrariamente ai processi aerobici, notoriamente energivori, offrono la concreta possibilità di ottenere un consistente ritorno economico mediante il recupero energetico dal biogas che in essi viene prodotto. Le tecnologie disponibili consentono di utilizzare il biogas, dopo una preliminare depurazione, a scopo cogenerativo, ossia per la produzione di energia elettrica e termica contemporaneamente, con rese tali da potere soddisfare gli autoconsumi dell’impianto di produzione stesso e tali da consentire una commercializzazione all’esterno…
Energy and environmental management protocols of an agrocombined system for biogas production from biomass waste: the experience of the project Italy…
2014
From biomass waste to tri-generation: a life-cycle experience in the “agro-combined” of Thibar
2018
The paper presents a Life Cycle Assessment of the energy tri-generation from biomass waste in a plant located in Tunisia. The analysis included the plant construction and end-of-life, the supply of biomass, its use for biogas production and the electricity, heating and cooling generation from biogas. The study is one of the first applications of environmental analysis to tri-generation from biomass waste in developing countries. The results showed that the plant construction is responsible of 76% of primary energy consumption and gives a contribution higher than 88% on resource depletion and ionising radiation. The operation causes 66% of the impact on human toxicity - cancer effects and mo…
Co-digestion of grass silage and cow manure in a CSTR by re-circulation of alkali treated solids of the digestate.
2008
Three laboratory, continuously stirred tank reactors (CSTRs) co-digesting grass silage and cow manure (forming 30% and 70% of substrate volatile solids (VS), respectively) were operated to evaluate the effects of re-circulating an alkali-treated and untreated solid fraction of the digestate back to the reactors. The CSTRs were operated at an organic loading rate (OLR) of 2 kg VS m(-3) day(-1) and hydraulic retention time (HRT) of 20 days with a semi-continuous mode of feeding. The feasibility of co-digestion with substrate VS containing 30% VS of crop was reinforced, resulting in average specific methane yield of about 180-185 1 CH4 kg(-1) VS. Re-circulation of the solid fraction of digesta…
Organic silicon compounds in biogases produced from grass silage, grass and maize in laboratory batch assays
2013
Abstract In the present study the occurrence of volatile organic silicon compounds in biogas produced from grass silage, grass and maize in laboratory batch assays was analyzed and methane potentials were determined. Inoculum from a mesophilic farm digester was used, and its effects were subtracted. Methane yields from grass silage, grass and maize were 0.38, 0.42 and 0.34 m3CH4/kg – volatile solids added (VSadd), respectively. Trimethyl silanol, hexamethylcyclotrisiloxane (D3), octamethylcyclotetrasiloxane (D4) and decamethylcyclopentasiloxane (D5) were detected from all the biogases. Higher yields of volatile organic silicon compounds in the grass (from 21.8 to 37.6 μg/kgVSadd) were detec…
Review of the impact of biogas digestates on the microbiological quality of agricultural soils
2023
The global production of biogas has increased threefold during the last decade to partly replace fossil fuels, yet biogas production by anaerobic digestion generates substantial amounts of by-products named digestates. These biogas digestates can be recycled in soils to fertilize crops and to sequester carbon. However, the impact of digestates on the soil biological is actually poorly known. Here we reviewed the impact of digestates published in 56 articles reporting 23 microbial parameters. Half of the articles show neutral effects of biogas digestates and 7% showed negative effects. 25% of the articles show more stimulation of biogas digestates for the soil microbial quality, compared to …
Efficienza e sostenibilità nel ciclo produttivo di una distilleria
2013
L’analisi dell’attività esercitata dalla distilleria Bertolino, ha consentito di mettere in evidenza i molteplici aspetti ambientali diretti e/o indiretti ad essa connessi in tutte le fasi del processo produttivo: dall’ingresso della materia prima, dei materiali di consumo ed i relativi consumi energetici, pervenendo ad uno studio di fattibilità per l’utilizzo del biogas in un impianto di cogenerazione in sostituzione di combustibili fossili.
Biogas production from the perspective of sustainable development
2020
One of the basic aspects of sustainable development strategy involves investments in green technologies, including energy production from renewable sources. Biomass, special organic waste which belongs to “green sources” of energy can be used in the methane fermentation process of biogas production to generate heat and electricity.Biogas power plants have functioned in the Polish energy industry for many years now. On the basis of the data available from Central Statistical Office, in 2014 the ratio of biogas accounted for 7.6% of the structure of primary energy derived from renewable sources in the EU and 2.6% in Poland. An important consideration related to the production of biogas is ass…
Anaerobic Degradation of Environmentally Hazardous Aquatic Plant Pistia stratiotes and Soluble Cu(II) Detoxification by Methanogenic Granular Microbi…
2021
The aquatic plant Pistia stratiotes L. is environmentally hazardous and requires effective methods for its utilization. The harmfulness of these plants is determined by their excessive growth in water bodies and degradation of local aquatic ecosystems. Mechanical removal of these plants is widespread but requires fairly resource-intensive technology. However, these aquatic plants are polymer-containing substrates and have a great potential for conversion into bioenergy. The aim of the work was to determine the main patterns of Pistia stratiotes L. degradation via granular microbial preparation (GMP) to obtain biomethane gas while simultaneously detoxifying toxic copper compounds. The compos…