6 documents found, page 1 of 1
On the independence of hydrogen production from methanogenic suppressor in oliv...
Gonçalves, Marta R.; Costa, J. C.; Pereira, M. A.; Abreu, A. A.; Alves, M. M.Anaerobic degradation of olive mill wastewater (OMW) at concentrations ranging from 2 to 100 g/L of chemical oxygen demand (COD) was assessed in batch assays. Methane was the main final product obtained for the lower concentrations tested. For 25 g COD/L, H2 was temporarily produced, albeit H2 depletion occurred, likely due to homoacetogenesis, since acetate was formed concomitantly. Hydrogen was produced and a...
Olive mill wastewater anaerobically digested : phenolic compounds with antiradi...
La Cara, Francesco; Ionata, Elena; Del Monaco, Giovanni; Marcolongo, Loredana; Gonçalves, Marta R.; Marques, I. P.The recovery of phenolic compounds, present in the olive fruits and its by-products, has been intensively studied by the antioxidant properties. Olive mill wastewater (OMW) is a phenolic-rich industrial effluent that can be advantageously valorized by the anaerobic digestion to the methane and agricultural fertilizer productions. The objective of this work was to evaluate the antiradical activity of OMW after a...
Bioenergy recovery from olive mill effluent in a hybrid reactor
Gonçalves, Marta R.; Freitas, P.; Marques, I. P.An anaerobic hybrid reactor was tested in the treatment of raw olive mill effluent (OME)without water dilution, chemical correction and any pretreatment. A feeding strategy was applied by increasing progressively the OME volume fraction from 8% to 83% in the feed mixture combined with an OME complementary substrate (piggery effluent). A biogas production of 3.16 m3 m-3 d-1 was achieved at an organic loading rat...
Electrochemical mineralization of anaerobically digested olive mill wastewater
Gonçalves, Marta R.; Marques, I. P.; Correia, J. P.A novel approach was developed for the energetic valorisation and treatment of olive mill wastewater (OMW), combining anaerobic digestion and electrochemical oxidation. The electrochemical treatment was proposed as the final step to mineralize the remaining OMW fraction from the anaerobic reactor. The electrooxidation of anaerobically digested OMW was investigated over dimensionally stable anodes (DSAs). RuO2 b...
Strategies for lipids and phenolics degradation in the anaerobic treatment of o...
Gonçalves, Marta R.; Costa, J. C.; Marques, I. P.; Alves, M. M.Strategies are proposed for the anaerobic treatment of lipid and phenolic-rich effluents, specifically the raw olive mill wastewater (OMW). Two reactors were operated under OMW influent concentrations from 5 to 48 g COD L-1 and Hydraulic Retention Time between 10 and 5 days. An intermittent feeding was applied whenever the reactors showed a severe decay in the methane yield. This strategy improved the mineraliz...
Anaerobic digestion of OMW : intermittent feeding strategy and LCFA oxidation p...
Gonçalves, Marta R.; Costa, J. C.; Marques, I. P.; Alves, M. M.Manuscript; An intermittent feeding strategy was applied to the anaerobic treatment of raw olive mill wastewater (OMW). Two reactors were operated under influent concentrations of 5 to 50 g COD L-1. Two and one batch (feed-less) periods were applied to reactor R1 and R2, respectively, operating in continuous thenceforth. It was demonstrated that the intermittent feeding of OMW improved the mineralization of acc...