Tópicos Sugeridos dentro de su búsqueda.
Tópicos Sugeridos dentro de su búsqueda.
Buscar alternativas:
"clean technology" » "clean technologies" (Expander búsqueda), "green technology" (Expander búsqueda), "a technology" (Expander búsqueda)
"clean technology" » "clean technologies" (Expander búsqueda), "green technology" (Expander búsqueda), "a technology" (Expander búsqueda)
1
artículo
Publicado 1999
Enlace
Enlace
A selection of hydrometallurgical applications are shown in the processing of sulfur concentrates, being influenced by environmental regulations; being known as clean technologies. The hydrometallurgy technology of leaching, solvent extraction and electrodeposition is described, as well as a series of current investigations to avoid the production of SO2 through the LIX-SX-EW hydrometallurgical route; as well as solid waste management with arsenic content, for safe storage.
2
artículo
Publicado 1999
Enlace
Enlace
A selection of hydrometallurgical applications are shown in the processing of sulfur concentrates, being influenced by environmental regulations; being known as clean technologies. The hydrometallurgy technology of leaching, solvent extraction and electrodeposition is described, as well as a series of current investigations to avoid the production of SO2 through the LIX-SX-EW hydrometallurgical route; as well as solid waste management with arsenic content, for safe storage.
3
artículo
Publicado 2007
Enlace
Enlace
Mining and metallurgical activity produces liquid effluents as a waste during the extraction process, which must be treated in order to be disposed in the environment, following governmental and environmental legislation. Big and medium size mining industry carry on environmental projects as it is the trend worldwide, but small size and informal mining did not have between its priorities the environmental issue due to the lack of research on clean technologies related to this sector which finally could influence in make more efficient its processes. The main aim of the research is centered on propose solutions with an experimental basis for design and dimension of containers in processes with chemical precipitation and cementing of dissolved metals in liquid effluents. Laboratory tests are detailed for cementing copper from liquid effluents by means of light scrap iron which allows recov...
4
artículo
Publicado 2007
Enlace
Enlace
Mining and metallurgical activity produces liquid effluents as a waste during the extraction process, which must be treated in order to be disposed in the environment, following governmental and environmental legislation. Big and medium size mining industry carry on environmental projects as it is the trend worldwide, but small size and informal mining did not have between its priorities the environmental issue due to the lack of research on clean technologies related to this sector which finally could influence in make more efficient its processes. The main aim of the research is centered on propose solutions with an experimental basis for design and dimension of containers in processes with chemical precipitation and cementing of dissolved metals in liquid effluents. Laboratory tests are detailed for cementing copper from liquid effluents by means of light scrap iron which allows recov...
5
artículo
Publicado 2007
Enlace
Enlace
The rice production includes the agriculture, productive, and distribution process. There are the need of the integral analysis, with the purpose of improve their efficient and competitively. In this contex are presented improvements that impact in the production and productivity in milling rice sited in Arequipa region. For that is making a productive process diagnostic, a benchmarking with the sector enterprises, and the introduction of more celan production concepts.
6
artículo
Publicado 2007
Enlace
Enlace
The rice production includes the agriculture, productive, and distribution process. There are the need of the integral analysis, with the purpose of improve their efficient and competitively. In this contex are presented improvements that impact in the production and productivity in milling rice sited in Arequipa region. For that is making a productive process diagnostic, a benchmarking with the sector enterprises, and the introduction of more celan production concepts.
7
artículo
In the context of clean technologies is not only important to maximize production , minimize costs, but also not pollute the environment , it is for that reason we must develop basic research leading to mitigate SO2 to prevent air pollution. Direct reduction of sulfides is of interest in the metallurgical field for the base metal , using a desulfurizer agent ( CaO, CaCO3 and Na2CO3) , this being a friendly metal production route. In this paper , we show the results of research in the direct reduction of chalcopyrite with carbon in the presence of lime, as a possibility to produce copper from a sulfide avoiding air pollution. ; Also their effect on the reacted fraction and temperature the reaction rate , reaction time , molar ratios of reactants : the effect of the variables involved in the carbothermic reduction was studied . Besides modeling the reduction kinetics of chalcopyrite descri...
8
artículo
In the context of clean technologies is not only important to maximize production , minimize costs, but also not pollute the environment , it is for that reason we must develop basic research leading to mitigate SO2 to prevent air pollution. Direct reduction of sulfides is of interest in the metallurgical field for the base metal , using a desulfurizer agent ( CaO, CaCO3 and Na2CO3) , this being a friendly metal production route. In this paper , we show the results of research in the direct reduction of chalcopyrite with carbon in the presence of lime, as a possibility to produce copper from a sulfide avoiding air pollution. ; Also their effect on the reacted fraction and temperature the reaction rate , reaction time , molar ratios of reactants : the effect of the variables involved in the carbothermic reduction was studied . Besides modeling the reduction kinetics of chalcopyrite descri...
9
artículo
Publicado 2000
Enlace
Enlace
In recent years, technologies are being developed to treat acid mine drainage ( AMD ) , rock drainage (ARD ) and other effluents which are causing environmental pollution, both in water and soil . International environmental regulations today are quite demanding , since the current priority is the preservation of the environment. Currently has been developing terminology SBR secuential batch reactor describing a group of variable volume systems for activated sludge treatment , where the processes of sedimentation, aeration and clarification are performed in the same reactor. In the SBR happen sequentially in time different processes of equalization, aeration and clarification. This added to the biomass technology allows treatment of a wide range of metallic and organic compounds. SBR is successfully applied in USA and Canada hundreds of industrial plants. In this context we construct the...
10
artículo
Publicado 2000
Enlace
Enlace
En los últimos años se están desarrollando tecnologías para el tratamiento de drenajes ácidos (AMD), drenaje de rocas (ARD) y otros efluentes que están causando contaminación ambiental, tanto de aguas como de suelos. Las normativas medioambientales internacionales en la actualidad son bastante exigentes, dado que la prioridad actual es la preservación del medio ambiente. Actualmente se ha venido desarrollando la terminología SBR secuential batch reactor que describe un grupo de sistemas de volumen variable para el tratamiento de lodos activados, donde los procesos de sedimentación, aireación y clarificación se realizan en un mismo reactor. En el SBR suceden en forma secuencial en tiempo diferentes procesos de ecualización, aireación y clarificación. Esto sumado a la tecnología de biomasa permite el tratamiento de un gran espectro de compuestos metálicos y orgánicos. SBR...
11
artículo
Publicado 1995
Enlace
Enlace
It tries to provide a global vision of how the environmental issue is being handled by the government and businessmen of Peru, as well as to warn about the consequences that the current trend can bring for the development of the country. It maintains that, although the Environmental Code was promulgated, its scope was moderated shortly afterwards through other legal instruments aimed at promoting investment. In the same way, it is affirmed that the creation of a rector, the National Environment Council, will not be a guarantee for the solution of environmental problems either. On the other hand, the very little importance that Peruvian managers give to the preservation of the environment in comparison with those of other countries stands out. Finally, it is affirmed that in order to care the natural heritage, it is necessary to become aware of the complementarity between development and ...
12
artículo
Publicado 2001
Enlace
Enlace
The present work is an effort to achieve an industrial eco-efficiency reducing the direct and indirect environmental impacts present in the industrial refining of soybean oil, the use of the neutralizing agent of potassium hydroxide is proposed instead of what is currently being used, which is sodium hydroxide, and in this way eliminate the liquid tributary that is poured into the public network causing a negative environmental impact on the water bodies and the sewer system; This adverse situation for the environment will revert into something favorable for the ecosystem. For this, a physicochemical treatment will be given to the tributary, transforming it into a liquid fertilizer that can be used to provide nutrients to the cultivated soils; Other environmental advantages that would be achieved are the following: a better quality soybean oil for edible use when leaving this refining st...
13
artículo
Publicado 2001
Enlace
Enlace
The present work is an effort to achieve an industrial eco-efficiency reducing the direct and indirect environmental impacts present in the industrial refining of soybean oil, the use of the neutralizing agent of potassium hydroxide is proposed instead of what is currently being used, which is sodium hydroxide, and in this way eliminate the liquid tributary that is poured into the public network causing a negative environmental impact on the water bodies and the sewer system; This adverse situation for the environment will revert into something favorable for the ecosystem. For this, a physicochemical treatment will be given to the tributary, transforming it into a liquid fertilizer that can be used to provide nutrients to the cultivated soils; Other environmental advantages that would be achieved are the following: a better quality soybean oil for edible use when leaving this refining st...
14
artículo
Publicado 2001
Enlace
Enlace
Actualmente se están desarrollando tecnologías para el tratamiento de drenajes ácidos de mina (DAM), drenaje de rocas (ARD) y otros efluentes industriales, que están causando contaminación de aguas así como de suelos. El drenaje ácido natural es uno de los focos de contaminación ambiental de las cuencas nacionales y por ello es preciso buscar las tecnologías apropiadas para su abatimiento a las condiciones ambientales convenientes. Las tecnologías ecológicamente racionales protegen al medio ambiente, son menos contaminantes, utilizan todos los recursos en forma más sostenible, reciclan una mayor porción de sus desechos y productos y tratan los desechos residuales en forma más aceptable que las tecnologías que han venido a sustituir. En el presente trabajo mostramos el estudio experimental de pruebas de rocas ácidas en columnas de percolación, en el cual tratamos de repro...
15
artículo
Publicado 2001
Enlace
Enlace
Technologies are currently being developed for the treatment of acid mine drains (DAM), rock drainage (ARD) and other industrial effluents, which are causing water and soil contamination. Natural acid drainage is one of the foci of environmental contamination in national watersheds and for this reason it is necessary to search for the appropriate technologies to reduce it to suitable environmental conditions. Environmentally sound technologies protect the environment, are less polluting, use all resources more sustainably, recycle a larger portion of their waste and products, and treat waste more acceptably than the technologies they have come to replace. In the present work we show the experimental study of acid rock tests in percolation columns, in which we try to reproduce what happens in the Peruvian mines, this leads us to simulate the main variables that are involved: feed flows an...
16
artículo
The present article analyzes the role of technology in relation to the economic development and the environment. for the case of developing countries. One considers the adoption of "adequate technology", that is the most advisable technology for a poor country, which must be the result of an ample analysis and discussion by all the sectors involved in the decision making and must comprise of the Plan of Sustainable Development of each country. The adoption of this type of technology will enable the creation of jobs, the protection of the environment, the international trade and the economic development.
17
artículo
The present article analyzes the role of technology in relation to the economic development and the environment. for the case of developing countries. One considers the adoption of "adequate technology", that is the most advisable technology for a poor country, which must be the result of an ample analysis and discussion by all the sectors involved in the decision making and must comprise of the Plan of Sustainable Development of each country. The adoption of this type of technology will enable the creation of jobs, the protection of the environment, the international trade and the economic development.
18
artículo
Publicado 2020
Enlace
Enlace
Cocoa is one of the most important crops in Ecuador, destined for export to be used in making chocolate in other countries. The objective of this work was to analyze the environmental performance and the potentialities of applying cleaner production mechanisms (CP) in the Association of producers of fine aroma cocoa "Tsatsayaku". The CP tools used were the initial environmental review, ecomaps, and process analysis. The results show that mucilage and cocoa husk generation are the main environmental problems of the process. Two improvement options were proposed and evaluated to control and reduce process contamination. The analysis shows a B / C ratio of 1.38 and the Net Present Value is $ 36,001.37 with an Internal Rate of Return of 249.29%. Finally, the application of practices and technologies framed in CP systems can optimize the use of raw materials and reduce the solid and liquid co...
19
artículo
Publicado 2020
Enlace
Enlace
Cocoa is one of the most important crops in Ecuador, destined for export to be used in making chocolate in other countries. The objective of this work was to analyze the environmental performance and the potentialities of applying cleaner production mechanisms (CP) in the Association of producers of fine aroma cocoa "Tsatsayaku". The CP tools used were the initial environmental review, ecomaps, and process analysis. The results show that mucilage and cocoa husk generation are the main environmental problems of the process. Two improvement options were proposed and evaluated to control and reduce process contamination. The analysis shows a B / C ratio of 1.38 and the Net Present Value is $ 36,001.37 with an Internal Rate of Return of 249.29%. Finally, the application of practices and technologies framed in CP systems can optimize the use of raw materials and reduce the solid and liquid co...
20
artículo
Publicado 2001
Enlace
Enlace
The present work deals with the proposed treatment scheme for the recovery of PVC and PET using mineral processing operations such as: size reduction. Separation by dense means, alkaline treatment and flotation. The results achieved at the laboratory level indicate that 95% of PVC and 97% of PET can be recovered from the selected sample of plastic containers collected in a residual sector of the city of Bucaramanga, Colombia.
