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Alkali activated materials based on fluid catalytic cracking catalyst residue (FCC): Influence of SiO2/Na2O and H 2O/FCC ratio on mechanical strength and microstructure

Tashima, M. M.; Akasaki, J. L.; Melges, J. L P; Soriano, L.; Monzó, J.; Payá, J.; Borrachero, M. V.
Fonte: Universidade Estadual Paulista Publicador: Universidade Estadual Paulista
Tipo: Artigo de Revista Científica Formato: 833-839
ENG
Relevância na Pesquisa
45.96%
Reuse of industrial and agricultural wastes as supplementary cementitious materials (SCMs) in concrete and mortar productions contribute to sustainable development. In this context, fluid catalytic cracking catalyst residue (spent FCC), a byproduct from the petroleum industry and petrol refineries, have been studied as SCM in blended Portland cement in the last years. Nevertheless, another environmental friendly alternative has been conducted in order to produce alternative binders with low CO2 emissions. The use of aluminosilicate materials in the production of alkali-activated materials (AAMs) is an ongoing research topic which can present low CO2 emissions associated. Hence, this paper studies some variables that can influence the production of AAM based on spent FCC. Specifically, the influence of SiO 2/Na2O molar ratio and the H2O/spent FCC mass ratio on the mechanical strength and microstructure are assessed. Some instrumental techniques, such as SEM, XRD, pH and electrical conductivity measurements, and MIP are performed in order to assess the microstructure of formed alkali-activated binder. Alkali activated mortars with compressive strength up to 80 MPa can be formed after curing for 3 days at 65°C. The research demonstrates the potential of spent FCC to produce alkali-activated cements and the importance of SiO2/Na2O molar ratio and the H2O/spent FCC mass ratio in optimising properties and microstructure. © 2013 Elsevier Ltd. All rights reserved.

Prospects for the use of municipal tree pruning wastes in particleboard production

Duarte Da Silva, Manuel Joaquim; Bezerra, Barbara Stolte; Gomes Battistelle, Rosane Aparecida; De Domenico Valarelli, Ivaldo
Fonte: Universidade Estadual Paulista Publicador: Universidade Estadual Paulista
Tipo: Artigo de Revista Científica Formato: 960-965
ENG
Relevância na Pesquisa
35.93%
The purpose of this study was to evaluate the physical and mechanical properties of particleboard made with pruning wastes from Ipê (Tabebuia serratifolia) and Chapéu-de-Sol (Terminalia catappa) trees. Particleboards were prepared with both wood species, using all the material produced by grinding the pruning wastes. The particleboards had dimensions of 45×45 cm, a thickness of approximately 11.5 mm and an average density of 664 kg/m3. A urea-formaldehyde adhesive was used in the proportion of 12% of the dry particle mass. The particleboards were pressed at a temperature of 130 C for 10 mins. The physical and mechanical properties analyzed were density, moisture content, thickness swelling, percentage of lignin and cellulose, modulus of resilience, modulus of elasticity and tensile strength parallel to the grain, accordingly to the standards NBR 14810 and CS 236-66 (1968). The particleboards were considered to be of medium density. The particle size significantly affected the static bending strength and tensile strength parallel to the grain. Ipê presented better results, demonstrating a potential for the production and use of particleboard made from this species. © The Author(s) 2013.

Influência do substrato no cultivo e na composição química do cogumelo Pleurotus florida

Figueiró, Gláucia Garcia
Fonte: Universidade Estadual Paulista (UNESP) Publicador: Universidade Estadual Paulista (UNESP)
Tipo: Dissertação de Mestrado Formato: 69 f. : il. fots. color.
POR
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35.94%
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES); Pós-graduação em Agronomia - FEIS; O presente trabalho teve por objetivo evidenciar os principais componentes químicos que influenciam o cultivo do cogumelo Pleurotus florida, bem como avaliar a composição química dos corpos de frutificação cultivados em diferentes resíduos agrícolas. Para tanto, foram utilizados seis resíduos agrícolas: palha de arroz (PA), palha de feijão (PF), palha de trigo (PT), palha de sorgo (PS), folha de bananeira (FB) e sabugo de milho (SM). Estes resíduos, coletados na Fazenda de Ensino, Pesquisa e Extensão da UNESP, Campus de Ilha Solteira, foram analisados quanto aos teores de macro (N, P, K, Ca, Mg) e micronutrientes (Fe, Mn e Zn), lignina, celulose, hemicelulose, cinzas e relação C/N. Foram avaliados: o tempo necessário para a colonização do substrato (corrida micelial), o início da formação de primórdios, o tempo total de cultivo, o número de cogumelos, a produção e a eficiência biológica utilizando a fórmula: EB = (peso fresco dos cogumelos/peso seco do substrato inicial) x 100. Além disso, os cogumelos foram avaliados quanto aos teores de macro (N, P, K, Ca e Mg) e micronutrientes (Fe, Mn e Zn) e o teor de proteínas. O substrato PF apresentou resultados semelhantes para produção (189...

Fermentative hydrogen production from microalgal biomass and agricultural wastes

Moura, Patrícia
Fonte: Laboratório Nacional de Energia e Geologia Publicador: Laboratório Nacional de Energia e Geologia
Tipo: Conferência ou Objeto de Conferência
Publicado em //2013 ENG
Relevância na Pesquisa
66.01%
Renewable, sustainable and carbon-neutral energy production is needed to deal with the challenges of the currently growing energy demand and deleterious climate changes. Hydrogen (H2) is presently seen as an ideal future energy carrier with technical, socio-economic and environmental benefits. H2 can be produced through biological conversion by photosynthesis, photo-heterotrophic and dark fermentation. The interest in biological hydrogen (bioH2) production has recently increased, as the traditional ways of H2 production are still costly and display a negative environmental impact. The research work on bioH2 production conducted at UB-LNEG targets the use of the most diverse feedstock biomass, process optimization and, whenever possible, integration under an energy-oriented biorefinery pathway. Microalgal biomass and agricultural wastes, such as carob pulp and chestnut shells, are excellent examples of non-food renewable biomass that we have already tested as potential feedstock for bioH2 production.

Lignocellulolytic enzyme production of Pleurotus ostreatus growth in agroindustrial wastes

Luz,José Maria Rodrigues da; Nunes,Mateus Dias; Paes,Sirlaine Albino; Torres,Denise Pereira; Silva,Marliane de Cássia Soares da; Kasuya,Maria Catarina Megumi
Fonte: Sociedade Brasileira de Microbiologia Publicador: Sociedade Brasileira de Microbiologia
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/12/2012 EN
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35.96%
The mushroom Pleurotus ostreatus has nutritional and medicinal characteristics that depend on the growth substrate. In nature, this fungus grows on dead wood, but it can be artificially cultivated on agricultural wastes (coffee husks, eucalyptus sawdust, corncobs and sugar cane bagasse). The degradation of agricultural wastes involves some enzyme complexes made up of oxidative (laccase, manganese peroxidase and lignin peroxidase) and hydrolytic enzymes (cellulases, xylanases and tanases). Understanding how these enzymes work will help to improve the productivity of mushroom cultures and decrease the potential pollution that can be caused by inadequate discharge of the agroindustrial residues. The objective of this work was to assess the activity of the lignocellulolytic enzymes produced by two P. ostreatus strains (PLO 2 and PLO 6). These strains were used to inoculate samples of coffee husks, eucalyptus sawdust or eucalyptus bark add with or without 20 % rice bran. Every five days after substrate inoculation, the enzyme activity and soluble protein concentration were evaluated. The maximum activity of oxidative enzymes was observed at day 10 after inoculation, and the activity of the hydrolytic enzymes increased during the entire period of the experiment. The results show that substrate composition and colonization time influenced the activity of the lignocellulolytic enzymes.

Methanogenic Community Dynamics during Anaerobic Utilization of Agricultural Wastes

Ziganshin, A. M.; Ziganshina, E. E.; Kleinsteuber, S.; Pröter, J.; Ilinskaya, O. N.
Fonte: A.I. Gordeyev Publicador: A.I. Gordeyev
Tipo: Artigo de Revista Científica
Publicado em //2012 EN
Relevância na Pesquisa
35.89%
This work is devoted to the investigation of the methanogenic archaea involved in anaerobic digestion of cattle manure and maize straw on the basis of terminal restriction fragment length polymorphism (T-RFLP) analysis of archaeal 16S rRNA genes. The biological diversity and dynamics of methanogenic communities leading to anaerobic degradation of agricultural organic wastes with biogas production were evaluated in laboratory-scale digesters. T-RFLP analysis, along with the establishment of archaeal 16S rRNA gene clone libraries, showed that the methanogenic consortium consisted mainly of members of the generaMethanosarcinaandMethanoculleus,with a predominance ofMethanosarcinaspp. throughout the experiment.

Lignocellulolytic enzyme production of Pleurotus ostreatus growth in agroindustrial wastes

da Luz, José Maria Rodrigues; Nunes, Mateus Dias; Paes, Sirlaine Albino; Torres, Denise Pereira; de Cássia Soares da Silva, Marliane; Kasuya, Maria Catarina Megumi
Fonte: Sociedade Brasileira de Microbiologia Publicador: Sociedade Brasileira de Microbiologia
Tipo: Artigo de Revista Científica
EN
Relevância na Pesquisa
35.96%
The mushroom Pleurotus ostreatus has nutritional and medicinal characteristics that depend on the growth substrate. In nature, this fungus grows on dead wood, but it can be artificially cultivated on agricultural wastes (coffee husks, eucalyptus sawdust, corncobs and sugar cane bagasse). The degradation of agricultural wastes involves some enzyme complexes made up of oxidative (laccase, manganese peroxidase and lignin peroxidase) and hydrolytic enzymes (cellulases, xylanases and tanases). Understanding how these enzymes work will help to improve the productivity of mushroom cultures and decrease the potential pollution that can be caused by inadequate discharge of the agroindustrial residues. The objective of this work was to assess the activity of the lignocellulolytic enzymes produced by two P. ostreatus strains (PLO 2 and PLO 6). These strains were used to inoculate samples of coffee husks, eucalyptus sawdust or eucalyptus bark add with or without 20 % rice bran. Every five days after substrate inoculation, the enzyme activity and soluble protein concentration were evaluated. The maximum activity of oxidative enzymes was observed at day 10 after inoculation, and the activity of the hydrolytic enzymes increased during the entire period of the experiment. The results show that substrate composition and colonization time influenced the activity of the lignocellulolytic enzymes.

Production of Xylanolytic Enzyme Complex from Aspergillus flavus using Agricultural Wastes

Kim, Jeong-Dong
Fonte: The Korean Society of Mycology Publicador: The Korean Society of Mycology
Tipo: Artigo de Revista Científica
EN
Relevância na Pesquisa
45.96%
Five types of agricultural wastes were used for the production of xylanolytic enzyme by Aspergillus flavus K-03. All wastes materials supported high levels of xylanase and β-xylosidase production. A high level of proteolytic activity was observed in barley and rice bran cultures, while only a weak proteolytic activity was detected in corn cob, barley and rice straw cultures. Maximum production of xylanase was achieved in basal liquid medium containing rice barn as carbon source for 5 days of culture at pH 6.5 and 25℃. The xylanolytic enzyme of A. flavus K-03 showed low thermostability. The times required for 50% reduction of the initial enzyme activity were 90 min at 40℃, 13 min at 50℃, and 3 min at 60℃. Xylanolytic activity showed the highest level at pH 5.5~10.5 and more than 70% of the original activity was retained at pH 6.5 and 7.0. The higher stability of xylanolytic enzymes in the broad range of alkaline pH is useful for utilization of the enzymes in industrial process requiring in alkaline conditions. Moreover, the highest production of xylanolytic enzyme was obtained when 0.5% of rice bran was supplied in basal liquid medium. SDS-PAGE analysis revealed a single xylanase band of approximately 28.5 kDa from the culture filtrates.

Natural additives and agricultural wastes in biopolymer formulations for food packaging

Valdés, Arantzazu; Mellinas, Ana Cristina; Ramos, Marina; Garrigós, María Carmen; Jiménez, Alfonso
Fonte: Frontiers Media S.A. Publicador: Frontiers Media S.A.
Tipo: Artigo de Revista Científica
Publicado em 26/02/2014 EN
Relevância na Pesquisa
46.01%
The main directions in food packaging research are targeted toward improvements in food quality and food safety. For this purpose, food packaging providing longer product shelf-life, as well as the monitoring of safety and quality based upon international standards, is desirable. New active packaging strategies represent a key area of development in new multifunctional materials where the use of natural additives and/or agricultural wastes is getting increasing interest. The development of new materials, and particularly innovative biopolymer formulations, can help to address these requirements and also with other packaging functions such as: food protection and preservation, marketing and smart communication to consumers. The use of biocomposites for active food packaging is one of the most studied approaches in the last years on materials in contact with food. Applications of these innovative biocomposites could help to provide new food packaging materials with improved mechanical, barrier, antioxidant, and antimicrobial properties. From the food industry standpoint, concerns such as the safety and risk associated with these new additives, migration properties and possible human ingestion and regulations need to be considered. The latest innovations in the use of these innovative formulations to obtain biocomposites are reported in this review. Legislative issues related to the use of natural additives and agricultural wastes in food packaging systems are also discussed.

Cultivation of oyster mushroom Pleurotus ostreatus on date-palm leaves mixed with other agro-wastes in Saudi Arabia

Alananbeh, Kholoud M.; Bouqellah, Nahla A.; Al Kaff, Nadia S.
Fonte: PubMed Publicador: PubMed
Tipo: Artigo de Revista Científica
EN
Relevância na Pesquisa
36.14%
Promoting the use of agricultural waste is one of the newly prepared water and environment friendly agriculture strategies in the Kingdom of Saudi Arabia (KSA). The objective of this research was to study the efficiency of cultivating oyster mushroom (Pleurotus ostreatus) on date palm wastes mixed with other agricultural wastes available in KSA. Four agricultural wastes were mixed with date palm leaves at different ratios, with two supplements and three spawn rates were used. Wheat straw mixed with date palm at ratio of 25 (date palm): 75 (agro-waste) showed the best results in most of the parameters measured. Corn meal was superior over wheat bran as a supplement in all treatments. Parameter values increased with the increase of the spawn rate of P. ostreatus. Treatments with date palm leave wastes contained higher carbohydrates and fibers. No significant differences were found among the fruiting bodies produced on the different agro-wastes studied for the different proximates analyzed. Analyses of metal concentration showed that potassium was the highest in all the treatments tested followed by Na, Mg, Ca, and Zn. This is the first study that reported the success of growing oyster mushroom on date palm leaf wastes mixed with other agro-wastes obtainable in KSA.

Standardization of medium composition and agricultural waste in the production of p-hydroxybenzoic acid by Paecilomyces variotii

Jain, Jyothi Ramesh; John, Jimcy Thalakootoor; Jyotirmoy, Ghosh; Manohar, Shiragambi Hanmatagouda
Fonte: Springer Berlin Heidelberg Publicador: Springer Berlin Heidelberg
Tipo: Artigo de Revista Científica
EN
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35.89%
Biotransformation of p-coumaric acid by Paecilomyces variotii resulted in the accumulation of a metabolite which was identified as p-hydroxybenzoic acid. We studied the possibility of enhancing this metabolite by various parameters such as varying the concentration of substrate, addition of different nitrogen sources and carbon sources at varying concentration and use of different agricultural wastes as a nutritive medium. Maximum amount of 254.6 ± 9.34 mg/kg of p-hydroxybenzoic acid was detected in the solid medium of corncob on 4th day of incubation using 10 mM p-coumaric acid as a sole carbon source. Consequently, P. variotii can be used as candidate fungi for the production of p-hydroxybenzoic acid. Solid wastes can be managed by using them for biotransformation of pharmaceutically important phenolic acids and hence cut down the cost of production of value-added compounds using a low-cost medium.

Disposição de resíduos sólidos numa voçoroca e seus impactos sobre as águas: um estudo de caso em Uberlândia/MG; The dumping of solid wastes in a ravine with advanced erosion levels and the effects of this dumping on the adjacent water supply: case study performed in Uberlândia-MG

Rocha, Leonardo
Fonte: Universidade Federal de Uberlândia Publicador: Universidade Federal de Uberlândia
Tipo: Dissertação
POR
Relevância na Pesquisa
35.9%
No período compreendido entre 1989 e 1993 a Prefeitura Municipal de Uberlândia dispôs todos os resíduos sólidos gerados no município em duas grandes voçorocas localizadas na sua zona rural, especificamente, na localidade denominada Fazenda Douradinho. No mesmo ano do encerramento das atividades, as áreas utilizadas para esta finalidade foram transformadas em aterro controlado. Porém, desde o início das disposições no local, nenhum estudo relativo as conseqüências sobre o meio ambiente foi realizado. Nesse contexto, o presente estudo teve como objetivo geral avaliar as conseqüências do aterro controlado na qualidade das águas superficiais e subterrâneas. Para se alcançar tais objetivos foram realizados levantamentos da literatura, de relatórios técnicos e de materiais cartográficos. Os trabalhos de campo possibilitaram a realização de ensaios geotécnicos in situ, construção de poços para monitoramento de água freática, coletas de amostras de solo e águas (superficial e subterrânea). As amostras de solo, coletadas em um talude natural da erosão e na cobertura do aterro controlado, foram ensaiadas no Laboratório de Geotecnia da Faculdade de Engenharia Civil da UFU com o objetivo de caracterizar e determinar suas propriedades geotécnicas. As amostras das águas superficial e subterrânea foram analisadas no Laboratório de Análises Químicas do Instituto de Química da UFU com vistas a determinação quantitativa de parâmetros que poderiam indicar a sua contaminação. A análise dos resultados de ensaios geotécnicos permite afirmar que o solo empregado para a cobertura final do aterro apresenta elevada permeabilidade...

Cultivo de Lentinus sajor-caju (Fr.) Fr. [= Pleurotus sajor-caju (Fr.) Singer] e Pleurotus spp. em diferentes substratos; Cultive of Lentinus sajor-caju (Fr.) Fr. [= Pleurotus sajor-caju (Fr.) Singer] e Pleurotus spp. in diferent substrata.

Albuquerque, Margeli Pereira de
Fonte: Universidade Federal de Pelotas; Agricultura familiar; Programa de P??s-Gradua????o em Sistemas de Produ????o Agr??cola Familiar; UFPel; BR Publicador: Universidade Federal de Pelotas; Agricultura familiar; Programa de P??s-Gradua????o em Sistemas de Produ????o Agr??cola Familiar; UFPel; BR
Tipo: Tese de Doutorado Formato: application/pdf
POR
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45.96%
The Pleurotus species, popularly known as oyster mushroom, are primary decompositers of woods and others biodegradables wastes. These mushrooms show nutricional proprieties with higher proteins, essencial aminoacids, unsaturated fat acids, vitamins and mineral contents, however are becoming as an important food resource. The substrata identification are the mainly stage in the productivity increase studies in the fungiculture. The in vitro and in vivo cultures aim to elucidate the optimal conditions of fungi growing related to a culture media that allow the fast development and increase the productivity. For Pleurotus spp. the currently strains available, were selected by the use of different ways of culture, aimed to increase the productivity. Therefore, these works aim to study the in vitro micelial growth and colonization of substratum and the productivity of three mushrooms strains in different agricultural wastes. Three experiments were carried out to reach the objectives, using rice straw, castor bean seed husks and peanut shells as substrata. In the first experiment, the strains was repicated to a petri dishes, with a solid medium prepared with the selected substrata, and incubated at 25??C. The mycelial growing was daily mensured with ruler and at the end of experiment the mycelial biomass was quantified. In the second experiment was evaluated the colonization capacity under in vitro conditions. The strains were repicated to the tubes with pasteurized susbtrata and incubated at 28??C. Were measured...

Review of Environmental, Economic and Policy Aspects of Biofuels

Rajagopal, Deepak; Zilberman, David
Fonte: World Bank, Washington, DC Publicador: World Bank, Washington, DC
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35.97%
The world is witnessing a sudden growth in production of biofuels, especially those suited for replacing oil like ethanol and biodiesel. This paper synthesizes what the environmental, economic, and policy literature predicts about the possible effects of these types of biofuels. Another motivation is to identify gaps in understanding and recommend areas for future work. The analysis finds three key conclusions. First, the current generation of biofuels, which is derived from food crops, is intensive in land, water, energy, and chemical inputs. Second, the environmental literature is dominated by a discussion of net carbon offset and net energy gain, while indicators relating to impact on human health, soil quality, biodiversity, water depletion, etc., have received much less attention. Third, there is a fast expanding economic and policy literature that analyzes the various effects of biofuels from both micro and macro perspectives, but there are several gaps. A bewildering array of policies - including energy...

Aligning Climate Change Mitigation and Agricultural Policies in Eastern Europe and Central Asia

Larson, Donald F.; Dinar, Ariel; Blankespoor, Brian
Fonte: World Bank, Washington, DC Publicador: World Bank, Washington, DC
Relevância na Pesquisa
35.91%
Greenhouse gas emissions are largely determined by how energy is created and used, and policies designed to encourage mitigation efforts reflect this reality. However, an unintended consequence of an energy-focused strategy is that the set of policy instruments needed to tap mitigation opportunities in agriculture is incomplete. In particular, market-linked incentives to achieve mitigation targets are disconnected from efforts to better manage carbon sequestered in agricultural land. This is especially important for many countries in Eastern Europe and Central Asia where once-productive land has been degraded through poor agricultural practices. Often good agricultural policies and prudent natural resource management can compensate for missing links to mitigation incentives, but only partially. At the same time, two international project-based programs, Joint Implementation and the Clean Development Mechanism, have been used to finance other types of agricultural mitigation efforts worldwide. Even so, a review of projects suggests that few countries in Eastern Europe and Central Asia take full advantage of these financing paths. This paper discusses mitigation opportunities in the region, the reach of current mitigation incentives...

Deregulating the Transfer of Agricultural Technology : Lessons from Bangladesh, India, Turkey, and Zimbabwe

Gisselquist, David; Nash, John; Pray, Carl
Fonte: World Bank Publicador: World Bank
Tipo: Artigo de Revista Científica
EN_US
Relevância na Pesquisa
35.92%
Many transition and developing economies have reduced direct public involvement in the production and trade of seed and other agricultural inputs. This trend creates opportunities for farmers to realize improved access to inputs, including technology from international private research. Unfortunately, input regulations often derail these opportunities by blocking private entry and the introduction of private technology. This study looks at the experience in Bangladesh, India, Turkey, and Zimbabwe to see whether regulations make a difference in agriculture and input industries in developing economies. In all countries, companies and farmers responded to regulatory reforms by introducing and adopting more new technology and by expanding the production, trade, and use of inputs. The increased use of private technology has brought higher yields and incomes, allowing farmers and consumers to reach higher levels of welfare. These results challenge governments to open their regulatory systems to allow market entry and the introduction of private technology through seeds and other inputs.

THERMAL STABILITY OF Pinus oocarpa AND MAIZE COB PARTICLEBOARDS

Scatolino,Mário Vanoli; Protásio,Thiago de Paula; Mendes,Rafael Farinassi; Mendes,Lourival Marin
Fonte: Editora da Universidade Federal de Lavras Publicador: Editora da Universidade Federal de Lavras
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/08/2015 EN
Relevância na Pesquisa
35.94%
Agricultural waste materials are generated in large quantities in Brazil. These can accumulate and cause serious environmental problems. One of the most commonly generated wastes in the brazilian agricultural culture is the maize cob. Being lignocellulosic in nature, the maize cob can find use as the raw material in the production of particleboards mainly concerned with furniture making. Therefore, studies regarding its thermal stability and fire resistance would be interesting. The aim of this study was to evaluate the combustibility and thermal stability of the particleboards produced from maize cob and Pinus oocarpa wood. The percentages in which maize cob was associated with Pinus oocarpa were 0%, 25%, 50%, 75% and 100%. The panels were produced using 8% urea-formaldehyde and 1% paraffin. The pressing cycle parameters included: temperature 150 °C, pressure of 3.92 MPa during 10 min. The combustibility curve analysis showed that the panels containing 25% content of maize cob had higher resistance to combustion. In general, the thermal stability decreased as the wood substitution by maize cob increased.

An overview on olive mill wastes and their valorisation methods

Roig, Asunción; Cayuela, M. L.; Sánchez-Monedero, Miguel Ángel
Fonte: Elsevier Publicador: Elsevier
Tipo: Artículo Formato: 259768 bytes; application/pdf
ENG
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35.93%
10 pages, 2 tables, 2 figures.; Olive mill wastes represent an important environmental problem in Mediterranean areas where they are generated in huge quantities in short periods of time. Their high phenol, lipid and organic acid concentrations turn them into phytotoxic materials, but these wastes also contain valuable resources such as a large proportion of organic matter and a wide range of nutrients that could be recycled. In this article, recent research studies for the valorisation of olive mill wastes performed by several authors were reviewed: second oil extraction, combustion, gasification, anaerobic digestion, composting and solid fermentation are some of the methods proposed. Special attention was paid to the new solid waste generated during the extraction of olive oil by the two-phase system. The peculiar physicochemical properties of the new solid waste, called two-phase olive mill waste, caused specific management problems in the olive mills that have led to the adaptation and transformation of the traditional valorisation strategies. The selection of the most suitable or appropriate valorisation strategy will depend on the social, agricultural or industrial environment of the olive mill. Although some methods are strongly consolidated in this sector...

Monitoring by Solid Phase Micro Extraction (SPME) the dynamics of volatile compounds released from soils amended with forest and agricultural wastes

Fuente, Esther de la; Soria, Ana C.; Díez-Rojo, M. A.; García-Álvarez, A.; Piedra-Buena, Ana; Almendros Martín, Gonzalo; Bello Pérez, Antonio
Fonte: Conselho Superior de Investigações Científicas Publicador: Conselho Superior de Investigações Científicas
Tipo: Póster Formato: 457541 bytes; application/pdf
ENG
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45.89%
Poster presentado en el International Symposium on Organic Matter Dynamics in Agro-Ecosystems, Poitiers (Francia); Solid Phase Microextraction represents an interesting tool that allows the fractionation of volatile compounds released by organic amendments applied to soil for their further analysis by GC-MS.; Peer reviewed

EXPERIMENTAL EVALUATIONOF THEMINIMUMFLUIDIZATIONVELOCITIESFOR MIXTURESOFCOLOMBIAN RESIDUAL COAL AND AGRICULTURAL WASTES

GÓMEZ,CARLOS; LOPERA,ELIANA
Fonte: DYNA Publicador: DYNA
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/10/2011 EN
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45.89%
A systematic experimental study is conducted to determine fluid dynamic properties such as the particle size distribution, bulk density, fluidizing velocity, etc.,of mixtures ofresidualcoal, a waste from the mining activity in Colombia, and agricultural wastes like rice husks, sawdust and coffee shells. From the results obtained in this study, optimal mixtures showing the best cold fluid dynamicswere recommended, for further evaluation in co-gasification process.