Loading...
22 results
Search Results
Now showing 1 - 10 of 22
- Pre-treatment experiments for the use of Cynara Cardunculus L. as a substrate for the production of biogasPublication . Oliveira, I. D. B.; Lageiro, Manuela; Di Berardino, Santino; Gominho, Jorge; Duarte, E.The purpose of the present study was to explore and evaluate the influence of different pretreatments on Cynara stalks over anaerobic digestion and potential methane production. Different pre-treatments followed by anaerobic digestion batch experiments, were carried-out to Cynara stalks feedstock in order to select the most effective combination. After selecting the most suitable inocullum/substrate (I/S) ratio, different pre-treatments: mechanical, thermal, thermal chemical and enzymatic were studied to enhance the biogas and methane yield in correlation with volatile solids (VS) reduction. The most promising pre-treatment was submitted to a final experiment, in order to set up optimized operational parameters. The thermal chemical pre-treatment applied to the substrate, in the final assay, doubled the cumulative methane yield in comparison with the trial conducted with the untreated one. The methane yield achieved was 0.59 l/g VSadded and 0.31 l/g VSadded for the pre-treated and untreated substrate respectively. The enhancement achieved is also shown in terms of VS reduction. Enzymatic pre-treatment can contibute to an improvement of untreated substrate hydrolyses and also an increase in methane yield of 18% in comparison with the one without enzymatic addition. Mechanical pre-treatment combined with the addition of enzymes enhance hydrolyses of the substrate improving inoculums efficiency however, more experiments are required within higher incubation times.
- Digestão anaeróbica em Porto SantoPublication . Di Berardino, Santino
- An integrated approach to energy production and nutrient recovery through anaerobic digestion of Vetiveria zizanoidesPublication . Crocamo, Angelo; Di Berardino, Santino; Di Giovanni, Raffaele; Fabbricino, Massimiliano; Martins-Dias, SuseteThis paper reports on experimental results used to verify the applicability of Vetiveria zizanoides (VZ) as a virtuous energetic crop. VZ produces biogas through its anaerobic digestion, and its nutrient content can be recovered through reuse, after digestion, as an agricultural amendment. Biomethanation tests were conducted with fresh and pretreated VZ, and the results of these tests were compared with those from the anaerobic degradation of common garden grass. Specific methane production was found to be around 650 Nm3 per ton of total organic carbon (TOC) for Vetiveria zizanoides, and around 510 Nm3 per ton of TOC for common grass, with no significant improvement after thermal pretreatment. Germination tests conducted with the digested VZ showed that the produced digestate fulfills the requirements of a fertilizer.
- Novas tendências nos sistemas de digestão anaeróbica e produção de biogásPublication . Di Berardino, SantinoOs sitemas integrados de valorização energética e ambiental dos resíduos com base na digestão anaeróbica associada a práticas agrícolas, podem constituir uma oprtunidade de negócios e de desenvolvimento do meio rural. A tecnologia existente consegue satisfazer, vantajosamnete, as aplicações práticas, existindo soluções inovadoras que poderão permitir maiores rendimentos. O cultivo de terrenos com plantas herbáceas com resíduos digeridos, pode susbtituir vantajosamente as culturas de alto rendimento e ocupar e valorizar terrenos marginais. O biogás é um combustível muito versátil, que pode alimentar os dispositivos mais diversos, nomeadamente as células a combustível, as turbinas a gás ou pode ser convertido em biometano. Em Portugal estes sistemas têm difuculdade em avançar na implementação, pois existem barreiras técnicas, não técnicas e económicas que devem ser removidas.
- Implementação de sistemas de Bioenergia: integração dos resíduos com a agriculturaPublication . Di Berardino, SantinoA evolução da nossa sociedade está cada vez mais dependente duma mudança do uso dos recursos naturais e do estilo de vida, que deverá ser baseada numa maior parcimónia e eficiência, na redução de emissões de gases com efeito estufa, na promoção de fontes de energias renováveis. Hoje em dia já se reconhece que os resíduos da nossa civilização, outrora encarados como fonte poluidora e colocados sem proveito em aterro, possuem um valioso potencial químico, energético e fertilizante que, pode ser aliado a culturas agrícolas, quer alimentares, quer energéticas, fechando o ciclo dos nutrientes e proporcionando emprego e desenvolvimento local.
- Promoting small scale anaerobic digestion systemsPublication . Di Berardino, Santino; Chatzimpiros, Alexis; Bourka, Olga
- 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.
- Anaerobic digestion of a fish processing industry sludgePublication . Carvalho, L.; Di Berardino, Santino; Duarte, E.Due to the fact that all fish processing plants operating in Portugal send their sludge from the wastewater treatment process to landfill, and because it is a costly management policy, the aim of this work was to assess the potential use of this substrate for the production of biogas through the anaerobic process technology. Anaerobic digestion has long proven to be an efficient way for the production of a renewable fuel – Biogas - that can be used as a source of energy to produce electricity and heat. This renewable energy resource can be used to reduce the plant processing costs, reducing also the industry carbon footprint. So, the produced sludge becomes a valuable sub-product of the wastewater treatment process instead of being considered a waste, with disposal costs associated. In this study we performed mesophilic (35 ± 1°C) batch assays during 51 days. The inoculum used was from an anaerobic digester operating in a municipal WWTP, also at mesophilic conditions. The anaerobic digestion of the fish sludge produced 700 m3 of CH4/ton SV, which is a really promising result.
- Biogas production from mediterranean crop silagesPublication . Carvalho, L.; Di Berardino, Santino; Duarte, E.Anaerobic digestion has proven to be an efficient way for the production of a renewable fuel. The aim of this work was to study the potential use of two crop silages, yellow lupine (Lupinus luteus L.) and oilseed radish (Raphanus sativus var. oleifera cv. Pegletta), for the production of biogas through the process of anaerobic digestion. The use of yellow lupine was due to its capacity for nitrogen fixation, reducing the fertilization needs for the succeeding crop cycle and reducing also the GHG emissions due to the fertilizer production and its field application. The utilization of the oilseed radish was due to its root exudates with nematicide effect, reducing the needs for soil disinfection, working as a biological weapon and also due to the effect on soil compaction of its large roots, working as a bio-driller. The yellow lupine gave rise to 400 m3 of CH4.t-1 VS and the oilseed radish silage produced approximately 300 m3 of CH4.t-1 VS, proving to be good anaerobic substrates. The inoculum used for the batch digesters was sludge from an anaerobic digester of a WWTP.
- Anaerobic digestion experiment using Cynara Cardunculus L. StalksPublication . Oliveira, I. D. B.; Di Berardino, Santino; Gominho, Jorge; Duarte, E.
- «
- 1 (current)
- 2
- 3
- »