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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...
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...
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...
Inoculum acclimation to oleate promotes the conversion of olive mill wastewater...
Gonçalves, M. M.; Costa, J. C.; Marques, I. P.; Alves, M. M.This work aims at selecting a suitable strategy to accelerate the start-up of the anaerobic treatment of olive mill wastewater (OMW) and to enhance the biogas production. Two anaerobic sludges were tested in toxicity and biodegradability batch experiments: biomass acclimated to oleate (BAO) and biomass non-acclimated (BNA). The results showed that the resistance to OMW toxicity was higher for the BAO than for t...
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 a...
Electrooxidation as the anaerobic pre-treatment of fats: Oleate conversion usin...
Gonçalves, M. M.; Alves, M. M.; Correia, J. P.; Marques, I. P.Electrochemical treatment of oleate using RuO2 and IrO2 type dimensionally stable anodes in alkaline medium was performed to develop a feasible anaerobic pre-treatment of fatty effluents. The results showed that the pre-treated solutions over RuO2 were faster degraded by anaerobic consortium than the raw oleate solutions or the electrolysed solutions using IrO2. In batch experiments carried out with pre-treated...
Effect of electrochemical treatment of oleic acid on anaerobic digestion
Gonçalves, M. M.; Bastos, E.; Alves, M. M.; Correia, J. P.; Marques, I. P.Electrochemical pre-treatment of oleate on anaerobic digestion was investigated using two anaerobic filters (AF and AFm) working, respectively, with increasing concentrations of electrochemically pre-treated oleate and oleate. Influents containing 25% and 50% of chemical oxygen demand (COD) of these substrates did not cause relevant alterations in either digester's performance. Comparatively, the pre-treated ol...
Anodic oxidation of oleate for wastewater treatment
Gonçalves, M. M.; Joyce, A.; Alves, M. M.; Correia, J. P.; Marques, I. P.The anodic conversion of oleate was carried out on RuO2 type DSA electrode under potentiostatic control. It was used as a pre-treatment of the anaerobic degradation of oleate, which is a long chain fatty acid abundant in wastewaters. Electrochemical treatment was found to improve the anaerobic biodegradation of lipidic wastewaters. In batch experiments, pre-treated oleate was converted to methane without any la...
Pré-tratamento de compostos lipídicos para tratamento anaeróbio: oxidação anód...
Gonçalves, M. M.; Joyce, A.; Alves, M. M.; Correia, J. P.; Marques, I. P.A digestão anaeróbia é uma opção energética e simultaneamente um processo de tratamento com reconhecidas vantagens ambientais, aplicável a uma grande variedade de efluentes diluídos e concentrados. Os compostos lipídicos são um componente importante da fracção orgânica em grande parte dos efluentes gerados quer pela a agricultura e municípios quer pela indústria. Apesar destes compostos constituírem um substrat...
Oxidação electroquímica de compostos lipídicos como precursora do tratamento an...
Tudella, Joana; Gonçalves, M. M.; Marques, I. P.; Joyce, A.; Alves, M. M.; Correia, J. P.A digestão anaeróbia é um processo de tratamento de efluentes e simultaneamente uma fonte de energia, através da produção de biogás. A presença de compostos lipídicos nos efluentes não só causa problemas de inibição dos microorganismos como pode levar à lavagem do sistema, sendo frequente a aplicação de pré-tratamentos. Os tratamentos físico-químicos mostram-se, por vezes, insuficientes e originam lamas indesej...
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