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- Hybrid anaerobic reactor: Brewery wastewater and piggery effluent valorisationPublication . Neves, André; Roseiro, Luisa B.; Ramalho, Luís; Eusebio, Ana; Marques, Isabel PaulaABSTRACT: A hybrid anaerobic reactor (HAR) operated to digest brewery wastewater, complemented with piggery effluent (60% and 40% v/v, respectively), under three hydraulic retention times: HRT: 5.7, 3.0 and 1.0 d. Along the first phase, the biogas of 0.9 LL− 1d− 1 evolved to 1.2 LL− 1d− 1 with a methane content of 77–78%. The HRT reduction to 3 days promoted the production until 2.1 LL− 1d− 1, with methane proportions of 79.5%. The operation with an even lower HRT (1 d) allowed to obtain a higher biogas (2.9 LL− 1d− 1, 79.5% CH4). HAR was successfully applied to the mixture digestion, even with a HRT as low as 1 day. Phenolic compounds with antioxidant capacity in effluent adds value, besides the supply of biogas/methane.
- Anaerobic digestion of pre-treated microalgae biomass [Resumo]Publication . Neves, André; Silva, Teresa Lopes da; Reis, Alberto; Ramalho, Luís; Eusebio, Ana; Marques, Isabel Paula
- Admissibility Grid to Support the Decision for the Preferential Routing of Portuguese Endogenous Waste Biomass for the Production of Biogas, Advanced Biofuels, Electricity and HeatPublication . Crujeira, Teresa; Trancoso, Maria Ascensão; Eusebio, Ana; Oliveira, Ana Cristina; Passarinho, Paula; Abreu, Mariana; Marques, Isabel Paula; Marques, Paula; Marques, Susana; Albergaria, Helena; Pinto, Filomena; Costa, Paula; Andre, Rui N.; Girio, Francisco; Moura, PatríciaABSTRACT: A methodology was developed to assess the allocation of different types of endogenous waste biomass to eight technologies for producing electricity, heat, biogas and advanced biofuels. It was based on the identification of key physicochemical parameters for each conversion process and the definition of limit values for each parameter, applied to two different matrices of waste biomass. This enabled the creation of one Admissibility Grid with target values per type of waste biomass and conversion technology, applicable to a decision process in the routing to energy production. The construction of the grid was based on the evaluation of 24 types of waste biomass, corresponding to 48 sets of samples tested, for which a detailed physicochemical characterization and an admissibility assessment were made. The samples were collected from Municipal Solid Waste treatment facilities, sewage sludges, agro-industrial companies, poultry farms, and pulp and paper industries. The conversion technologies and energy products considered were (trans)esterification to fatty acid methyl esters, anaerobic digestion to methane, fermentation to bioethanol, dark fermentation to biohydrogen, combustion to electricity and heat, gasification to syngas, and pyrolysis and hydrothermal liquefaction to bio-oils. The validation of the Admissibility Grid was based on the determination of conversion rates and product yields over 23 case studies that were selected according to the best combinations of waste biomass type versus technological solution and energy product.
- Molecular profiling of microbial populations in aerated bio-treatment of olive oil wastewater, P186Publication . Eusebio, Ana; Gadanho, M.; Mateus, Marta; Tenreiro, R.; Almeida-Vara, Elsa; Duarte, José Cardoso
- Efficient conversion of agricultural and forest residues into bioethanol: BIOFLEXPOR as flexible technology towards sugar-based biorefineries [Poster]Publication . Marques, Susana; Paixão, Susana M.; Alves, Luís; Gomes, Miguel; Eusebio, Ana; Lopes, Tiago; Coelho, Lucas; Diebold, Eduardo; Gírio, FranciscoABSTRACT: Lignocellulosic ethanol is in the upfront of advanced biofuels to be commercialized worldwide. However, the commercial deployment of 2G ethanol is dependent of high biomass availability and cost-effective supply. In Europe, some agricultural residues are presently underused and constitute attractive renewable resources. In addition, residual forest biomass, non-seasonably available at low cost, might be complementarily used as raw material boosting the economy of biorefineries. In this context, the present work deals with the development of an innovative and sustainable technological strategy to produce advanced bioethanol using agricultural and forestry residual biomass. The bioprocess involves enzymatic hydrolysis of major lignocellulose polysaccharides (cellulose and xylan) with commercial enzymes and fermentation of the resulting sugars. A pre-treatment step should firstly be accomplished to make cellulose more amenable to hydrolytic enzymes, and the prototype is based on a proprietary non-catalysed steam explosion technology, i.e., without the addition of acids and using only high-pressure steam, called FLEXBIO™, which was initially developed in Brazil by the company STEX and since 2019 in partnership with LNEG. The proposed technology has been successfully demonstrated in a relevant environment (TRL 5) for the efficient conversion of corn stover, olive tree pruning and eucalyptus-based forest residual biomass, yielding close to 150 L of ethanol per metric tonne (dry basis) of biomass, corresponding to an overall yield close to 75% of maximal theoretical yield for glucan conversion. Both enzymatic hydrolysis and fermentation steps have achieved yields superior to 85% of the maximal theoretical conversion, and the optimization of process configuration, targeting the best integration with pre-treatment, is now under progress and higher yields will be expected. Given the higher xylan content of corn stover, both cellulose and xylan fractions are pursued. In addition, the upgrading potential of all wastewater streams will also be assessed, by studying the feasibility of its combined use to increase the ethanol yield as alternative to its use for biogas production through anaerobic digestion, with the goal to reach near-zero waste. In conclusion, the present study reveals the industrial potential of this flexible technology that might be applied to implement distinct small-scale sugar-based biorefineries by converting several lignocellulosic raw materials into distinct marketable biofuels/biomaterials, promoting the circular bioeconomy.
- Jet-loop reactor with cross-flow ultrafiltration membrane system for treatment of olive mill wastewaterPublication . Ribeiro, Belina; Torrado, Ivone; Di Berardino, Santino; Paixão, Susana M.; Rusan, M. J.; Amer, A. Bani; Zuraiqi, S.; Eusebio, AnaABSTRACT: Olive oil extraction is one of the ancient agricultural industries all over the Mediterranean area and even today it is of fundamental economic importance for many industries found over the whole Mediterranean. However, this industry generates large amounts of olive mill wastewater (OMW) and due to its physicochemical characteristics it causes severe environmental concerns and management problems in the Mediterranean area, which is facing water scarcity. Technologies to reuse this wastewater will have a high impact at the economic and environmental level. The work presented aims to improve the use of jet-loop reactors technology for the aerobic biotreatment of OMW. A jet-loop reactor (100 L) coupled with an ultrafiltration (UF) membrane (MBR) system (JACTO.MBR_100 L) were tested for the influence of hydraulic parameters on OMW degradation and scale-up to 1,000 L. Chemical oxygen demand and total phenols (TP) decreased notably (up to 85% and 80% removal efficiency, respectively) after the biological treatment. The treated OMW (UF permeate) was evaluated as a source for irrigation and its impact on the soil and plant growth and their quality parameters.
- Energetic potential of piggery effluent by anaerobic digestion [Resumo]Publication . Eusebio, Ana; Ramalho, Luís; Carvalheiro, Florbela; Gírio, Francisco; Marques, Isabel PaulaABSTRACT: The sector of pig farming in Portugal is looking for sustainable and practical solutions to overcome existing environmental problems caused by very polluting discharges of effluents in rivers and wastewater treatment plants. The anaerobic digestion (AD) is a suitable process used to treat an organic effluent and, simultaneously, provide the agricultural and energetic valorisation of the substrate. The main objective of this work was to evaluate the energetic potential of a piggery effluent, collected in a pig farm with 9,000 animals, estimated in a volume of 900-1,170 m3 d-1. Anaerobic digestion assays were carried out in batch mode, under anaerobic and mesophilic conditions.
- TGGE-monitoring of the microbial community along the olive mill wastewaters anaerobic treatmentPublication . Eusebio, Ana; Tacão, M.; Baeta-Hall, Lina; Freitas, P.; Almeida-Vara, Elsa; Marques, Isabel Paula
- Detection of D/N functional genes during a biotreatment of mixed olive oil and winery wastewatersPublication . Eusebio, Ana; Vaz, A.; Tacão, M.; Eusébio, M.; Ribeiro, C.; Tenreiro, R.; Almeida-Vara, Elsa
- Molecular assessment of microbial community structure and dynamic along mixed olive oil and winery wastewaters biotreatmentPublication . Eusebio, Ana; Tacão, M.; Chaves, S.; Tenreiro, R.; Almeida-Vara, Elsa