title: Dephenolization of stored olive-mill wastewater, using four different adsorbing matrices to attain a low-cost feedstock for hydrogen photo-production.
abstract: This investigation deals with the conversion of olive-mill wastewater (OMW) into several feedstocks suitable for hydrogen photo-production. The goal was reached by means of two sequential steps: (i) a pre-treatment process of stored-OMW for the removal of polyphenols, which made it possible to obtain several effluents, and (ii) a photo-fermentative process for hydrogen production by means of Rhodopseudomonas palustris sp. Four different adsorbent matrices (Azolla, granular active carbon, resin, and zeolite) were used to dephenolize stored-OMW. The four liquid fractions attained by using the above process created the same number of effluents, and these were diluted with water and then used for hydrogen photo-production. The maximum hydrogen production rate (14.31 mL/L/h) was attained with the photo-fermenter containing 25% of the effluent, which came from the pre-treatment of stored-OMW using granular active carbon. Using the carbon effluent as feedstock, the greatest light conversion efficiency of 2.29% was achieved.
authors.affiliation: Istituto per lo Studio degli Ecosistemi, Sede di Firenze, Consiglio Nazionale delle Ricerche, Polo Scientifico, Via Madonna del Piano n. 10, 50019 Sesto Fiorentino, Firenze, Italy.
authors.forename: Giulia
authors.initials: G
authors.lastname: Padovani
authors.forename: Cristina
authors.initials: C
authors.lastname: Pintucci
authors.forename: Pietro
authors.initials: P
authors.lastname: Carlozzi
mesh_terms: D000143:Acids; D000327:Adsorption; D001429:Bacteriochlorophylls / Q000378:metabolism; D061249:Batch Cell Culture Techniques; D001673:Biodegradation, Environmental; D057919:Biological Oxygen Demand Analysis; D018533:Biomass; D003365:Costs and Cost Analysis; D005285:Fermentation; D006859:Hydrogen / Q000378:metabolism*; D007220:Industrial Waste / Q000032:analysis*; D031658:Olea / Q000737:chemistry*; D010084:Oxidation-Reduction; D010636:Phenols / Q000302:isolation & purification*; D018462:Photobiology / Q000191:economics* / Q000379:methods*; D058433:Photobioreactors / Q000382:microbiology; D012241:Rhodopseudomonas / Q000254:growth & development / Q000378:metabolism; D013997:Time Factors; D014835:Volatilization; D014865:Waste Disposal, Fluid; D062065:Wastewater / Q000737:chemistry*
chemical_list: D000143:Acids; D001429:Bacteriochlorophylls; D006859:Hydrogen; D007220:Industrial Waste; D010636:Phenols; D062065:Wastewater