101,959 research outputs found
Povertà multidimensionale, povertà come mancanza di capacita' ed esclusione sociale: un'analisi critica e un tentativo di integrazione
No full textDifferences in genetic structuring of populations of the Argentine hemorrhagic fever reservoir, the rodent Calomys musculinus, from endemic and non endemic zones
No full textChiappero, M.B., Piacenza, M.F., Gardenal, C.N., Calderón, G., Provensal, C., Polop, J.J
Biomethane potential of wine lees from mesophilic anaerobic digestion
No full textWine lees (WL) are undervalued residues from the wine-making process. Anaerobic digestion (AD) of WL is
highly challenging due to the acidic pH and high content of readily biodegradable compounds. This study
investigated the biomethane potential (BMP) of 3 WL samples through mesophilic batch tests fed with 2–3 %
total solids. The influence of wood-based biochar (BC), considering 2 different BCs and doses (3 and 10 g L- 1),
was also assessed. BMP values up to 1.257 Nm3 kgVS - 1 and 92–96 % soluble COD removal were recorded.
However, the inhibition of methanogenesis was observed due to organic acids accumulation exceeding 21–24 g
L- 1. BC addition didn’t improve biomethane production in the considered experimental conditions. This study
proved that WL is a highly attractive AD substrate, considering its high biodegradability and availability
throughout the year, although the process must be carefully operated
Impact of biochar on anaerobic digestion: Meta-analysis and economic evaluation
No full textThe growing global energy demand encourages the request for renewable sources, as biomethane from the
anaerobic digestion (AD) of waste biomass. Biochar (BC) can effectively increase methane production when
supplemented to AD, depending on BC physico-chemical properties. This study was developed in two phases.
Firstly, a systematic meta-analysis of current literature was performed to correlate AD performance with BC
properties, aiming to define their optimal range. The obtained results prove that BC enhances and accelerates
biomethane production. Considering 408 experimental conditions of 76 studies in batch mode, biomethane yield
and maximum production rate were significantly increased by BC addition. From the results of the subgroups
meta-analysis, an optimal range of BC physico-chemical properties may be suggested as follows: high ash (≥
20%) and low C contents (< 50%), high O/C molar ratios (≥ 0.3), high contents of O (≥ 20%) and N (≥ 0.6%),
acidic pH (< 7.0), low surface area (< 10 m2 g-1). Secondly, an economic analysis aimed at assessing the
economic profitability of BC addition to an existing AD plant suggest avoiding a dose above 0.45–0.76 gBC gVS -1, independently of the specific AD operating conditions. In conclusion, BC application in full-scale digesters is able to maximize biomethane production and economically feasible
- …
