Increasing the large scale feasibility of a solid phase extraction procedure for the recovery of natural antioxidants from olive mill wastewaters

The present investigation was focused on improving the feasibility of large scale applications of a solid phase extraction (SPE) procedure dedicated to the recovery of polyphenols from olive mill wastewaters (OMWs). To this aim, a previously developed SPE procedure was optimized in terms of contact time without negatively affecting the overall process productivity. The possibility of regenerating and recycling both the solid phase (Amberlite XAD16 non-polar resin) and the extraction solvent (acidified ethanol) was also demonstrated. In particular, the resin was successfully reused in 10 consecutive SPE cycles (including washing and reactivation steps), allowing almost constant polyphenols adsorption and desorption ratios (81.44 ? 0.91% and 52.69 ? 5.57%, respectively). Up to 695 mL of ethanol per liter of exhausted extraction solvent were recovered by means of a rotary evaporator. Furthermore, the solvent conventionally used for resin activation (i.e., methanol) was successfully substituted by a more biocompatible solvent (i.e., ethanol). An ORAC value corresponding to 6979 lM of Trolox equivalents was observed for the concentrated polyphenolic solution, obtained as a result of rotary evaporator operations. Importantly, no substantial loss of radical scavenging and antioxidant activities occurred by means of the aforementioned operations dedicated to the recovery of ethanol from the obtained polyphenolic solution

Green energy from grown at low to high irradiance values, under fed-batch operational conditions

International audiencewas grown under continuous irradiances of 36, 56, 75, 151, 320, 500, and 803 W m, for a co-production of both bio-H and biodiesel (lipids) using fed-batch conditions. The highest overall bio-H produced [4.2 l(H) l] was achieved at 320 W m, while the highest dry biomass (3.18 g l) was attained at 500 W m. Dry biomass contained between 22 and 39% lipid. The total energy conversion efficiency was at its highest (6.9%) at 36 W m

Der Born Judas : Legenden, Märchen und Erzählungen

gesammelt von M. J. bin Gorion. [Übertr. von Rahel Ramberg

Resource recovery from pig manure via an integrated approach : a technical and economic assessment for full-scale applications

Intensive livestock farming cannot be uncoupled from the massive production of manure, requiring adequate management to avoid environmental damage. The high carbon, nitrogen and phosphorus content of pig manure enables targeted resource recovery. Here, fifteen integrated scenarios for recovery of water, nutrients and energy are compared in terms of technical feasibility and economic viability. The recovery of refined nutrients with a higher market value and quality, i.e., (NH4)(2)SO4 for N and struvite for P, coincided with higher net costs, compared to basic composting. The inclusion of anaerobic digestion promoted nutrient recovery efficiency, and enabled energy recovery through electricity production. Co-digestion of the manure with carbon-rich waste streams increased electricity production, but did not result in lower process costs. Overall, key drivers for the selection of the optimal manure treatment scenario will include the market demand for more refined (vs. separated or concentrated) products, and the need for renewable electricity production

Resource recovery from pig manure via an integrated approach : a technical and economic assessment for full-scale applications

MARIS, Bernard. Des Économistes Au-dessus de Tout Soupçon, ou la GrandeMascarade des Prédictions. Paris, Albin Michel, 1990