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91.
Recycled blocks with improved sound and fire insulation containing construction and demolition waste
Carlos Leiva Jaime Solís-Guzmán Madelyn Marrero Celia García Arenas 《Waste management (New York, N.Y.)》2013,33(3):663-671
The environmental problem posed by construction and demolition waste (C&D waste) is derived not only from the high volume produced, but also from its treatment and disposal. Treatment plants receive C&D waste which is then transformed into a recycled mixed aggregate. The byproduct is mainly used for low-value-added applications such as land escape restoration, despite the high quality of the aggregate. In the present work, the chemical composition properties and grading curve properties of these aggregates are defined. Furthermore, the resulting recycled concrete with a high proportion of recycled composition, from 20% to 100% replacement of fine and coarse aggregate, is characterized physically and mechanically. An environmental study of the new construction material when all aggregates are substituted by C&D waste shows a low toxicity level, similar to that of other construction materials. The new material also has improved properties with respect to standard concrete such as high fire resistance, good heat insulation, and acoustic insulation. 相似文献
92.
Maria A. García-Valiñas Roberto Martínez-Espiñeira Francisco González-Gómez 《Journal of environmental management》2010,91(12):2696-2706
Using information on a basic or “lifeline” level of domestic water use obtained from a water demand function based on a Stone–Geary utility function, a minimum water threshold of 128 m3 per household per year was estimated in a sample of municipalities in Southern Spain. As a second objective, water affordability indexes were then calculated that relate the cost of such lifeline to average municipal income levels. The analysis of the factors behind the differences in that ratio across Andalusian municipalities shows that the relative cost of purchasing the lifeline appears inversely related to average income levels, revealing an element of regressivity in the component of water tariffs affecting the least superfluous part of the household’s consumption. The main policy recommendation would involve redesigning water tariffs in order to improve access for lower income households to an amount of water sufficient to cover their basic needs. The proposed methodology could be applied to other geographical areas, both from developed and from developing countries, in order to analyze the degree of progressivity of the water tariffs currently in effect and in order to guide the design of more equitable regulatory policies. 相似文献
93.
Morello Thiago Fonseca da Silva e Silva Luís Fernando 《Environmental Economics and Policy Studies》2023,25(2):115-142
Environmental Economics and Policy Studies - To test if tax return can effectively and efficiently increase the acceptance of externality taxation, a laboratory experiment with a negative... 相似文献
94.
Teresa Moreno Marco Pandolfi Xavier Querol Javier Lavín Andrés Alastuey Mar Viana Wes Gibbons 《Environmental science and pollution research international》2011,18(2):173-183
Purpose
Industrial emissions can raise urban background levels of inhalable Mn particles in an order of magnitude above normal, eclipsing the contribution made by natural sources and traffic. 相似文献95.
Norma Estrada Carmen Rodríguez-Jaramillo Gerardo Contreras Felipe Ascencio 《Marine Biology》2010,157(6):1401-1415
In general, bivalves are not affected by exposure to toxic dinoflagellates that produce paralyzing shellfish poisons (PSP).
After injection with PSP extracted from the Gymnodinium catenatum, Nodipecten subnodosus is paralyzed, indicating that PSP provokes effects similar to what is observed in vertebrates, including paralysis and metabolic
stress. To investigate the processes involved in poisoning by PSP, lions-paw scallops were injected with gonyautoxin (GTX)
2/3 epimers in the adductor muscle. Mild doses provoked adductor muscle contractions and paralysis, mantle retraction, and
incapacity of shell closure, but scallops gradually recovered in a clear, dose-time recovery pattern. With high doses of GTX
2/3, scallops were permanently paralyzed, and hemocytes in hemolymph were reduced. Surprisingly, under these conditions, scallops
continued normal feeding and did not show any microscopic defect in intestine or gills, but hemocytes infiltrated the adductor
muscle and abnormal vitellogenesis and mantle melanization occurred. Paralysis stress was accompanied by negative scallop
responses, based on visible effects, generation of nitric oxide, lipid peroxidation, and changes in antioxidant and hydrolytic
enzymes in hemocytes and tissues. These data can be used to understand potential side effects of PSP in bivalves. 相似文献
96.
97.
Andrés Pérez-parada Joaquín González Lucía Pareja Lucía Geis-Asteggiante Marcos Colazzo Silvina Niell 《Journal of environmental science and health. Part. B》2013,48(8):796-803
In order to evaluate the extraction of pesticide residues that are transferred to the brew during mate drinking process of P.U.1 yerba mate leaves (Ilex paraguariensis), a special device to simulate the way in which mate is drunk in Uruguay was developed. The transfer to the brew of 12 organophosphates, 5 synthethic pyrethroids and one organochlorine pesticide from spiked samples was studied. The relationship between the transfer data thus obtained and physicochemical properties like water solubility (Ws), octanol-water coefficient (Kow) and Henry's constant (H) was evaluated. The extractability of the pesticide residues from yerba mate can be correlated with log Ws and log Kow. These transfer values allowed the calculation of ARLs (acceptable residue level) for the pesticides following Food and Agriculture Organization (FAO), World Health Organizaion (WHO) guidelines. These results can help the future establishment of maximum residue levels (MRLs) 相似文献
98.
Wagner G. Moravia Míriam C.S. Amaral Liséte C. Lange 《Waste management (New York, N.Y.)》2013,33(1):89-101
A high content of refractory organic matter, ammonia and toxic compounds is characteristic of landfill leachate. Advanced oxidative processes (AOPs) are an attractive alternative for landfill leachate treatment. However, when applied as a unique process treatment, they do not provide a complete solution for the effluent treatment. Combining AOP with a membrane separation process (MSP) presents a number of benefits and provides an adequate solution for this problem. With this in mind, the present work aims to evaluate, using a bench scale, leachate treatability through AOP by Fenton’s reagent (AOP/Fenton) combined with microfiltration (MF) and nanofiltration (NF). A high efficient removal of COD (63%), true color (76%) and humic substances (50%) was observed during AOP/Fenton under optimized conditions (1.7 g H2O2/g CODraw leachate; FeSO4·7H2O:H2O2 = 1:5.3; pH = 3.8; reaction conditions = 115 rpm/28 min). According to the evaluated parameters, MSP presented an efficient complementary treatment, in which the integrity of the stages was sufficient for reaching regulatory levels in the effluent (Deliberação Normativa Conjunta COPAM/CERH-MG No. 1, May 5, 2008). 相似文献
99.
100.