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Construction and Demolition Waste Management Scenario in Republic of Cape Verde—The Case Study of City of Praia

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Journal of Environmental Protection 2016年第13期7卷 2009-2017页

作者： Luciene Eveline Semedo Vaz leandro Vahia pontual Fernando Benedicto Mainier Ana Lúcia Torres Seroa da Motta Department Pós-Graduação em Engenharia Civil Universidade Federal Fluminense Niterói Brazil

Globally, the construction industry is one of the leading producers of solid waste. The city of Praia, the capital of the Republic of Cape Verde has been suffering from environmental degradation with the irregular disposal of waste caused by inadequate management of waste from construction and also the demolition. The research was developed based on local inspections in the context of environmental laws, in semi-structured interviews with people who deal with this activity and bibliographic references. The main conclusion is that the city does not have a CDW management plan consequently leading to environmental problems. On the other hand, waste of recycled construction can be used as inert reducing the consumption of raw materials that can be used as base and sub-base for paving, landfills, aggregate in mortars and raw materials to be manufactured blocks, bricks concrete tiles, etc.

关键词： Construction Management Construction and Demolition Waste Sustainability Environmental Impact

Evaluation of the Performance of Galvanized Steel Support in Construction of Living Wall Systems

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Open Journal of Civil Engineering 2016年第4期6卷 566-576页

作者： Fernando B. Mainier Maria Alejandra Rico Pérez leandro V. pontual Ana Lucia Torres Seroa da Motta Escola de Engenharia Universidade Federal Fluminense Niterói Brazil

Currently, Living Wall Systems (LWSs) are assuming great importance in the built environment, due to environmental and aesthetic advantages, as well as the use of urban residual space and underutilized surfaces of buildings. However, the maintenance and the durability of the materials used have been a challenge for architects and professionals in the field. The aim of this paper is to evaluate the anti-corrosion performance of a steel framing profile, galvanized carbon steel (55% Al-Zn), a sustainable material with easy assembly, to apply LWS in the hot and humid tropical climate of Niterói (Rio de Janeiro, Brazil). In order to create the conditions of the tests, “X” cut were made in Al-Zn coating, sanding, and application of epoxy and glass fiber-reinforced polyester. After the experiments that lasted four months, the 55% Al-Zn coating was analyzed using Scanning Electron Microscope (SEM) and energy dispersive X-ray spectroscopy (EDS). The results of the tests were promising for the use of this galvanized steel for application as a support for green vertical facades. 55% Al-Zn coatings are recommended for marine atmospheres due to their good anti-corrosion performance.

关键词： Living Wall System (LWS) 55% Al-Zn Coating Steel Framing Galvanized Steel Corrosion

Electrolytic Cobalt Removal in Wastewater

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Journal of Environmental Protection 2016年第5期7卷 728-733页

作者： Isabela O. Santos Isaque C. A. Santos leandro V. pontual Luciane P. C. Monteiro Fernando B. Mainier Escola de Engenharia Universidade Federal Fluminense Niterói Brazil

Industrial effluents containing cobalt ions have become a serious problem for the environment, unless properly treated, due to their toxic potential. Currently there has been an intensification of the use of cobalt in several industrial sectors as super alloys, catalysts, batteries and pigments in ceramic materials, and a consequent intensification also of environmental contamination. This paper aims to show a simple and effective treatment for the removal of cobalt ions from simulated industrial wastewater, based on cathodic eletrolytic removal using a carbon steel screen. As a result, a 73% removal of cobalt ions from solutions was achieved with a concentration of 400 mg Co2+/L, a current of 0.30 A and a voltage of 30 V. In the same conditions, 84% and 88% was removed from 200 mg Co2+/L and 100 mg Co2+/L, respectively. Thus, this method presents itself as a cheap and efficient alternative for the treatment of industrial effluents containing cobalt ions.

关键词： Cobalt Electrolytic Removal Effluents Contaminations

Electrolytic Removal of Cadmium, Lead and Copper from Wastewater

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Journal of Environmental Protection 2016年第5期7卷 699-704页

作者： Isaque C. A. Santos Isabela O. Santos leandro V. pontual Luciane P. C. Monteiro Fernando B. Mainier Escola de Engenharia Universidade Federal Fluminense Niterói Brazil

The respective compounds of copper, cadmium and lead, owing to their strong toxic potential, as a result of industrial effluent, have left a trail of contamination in humans and the environment. This paper aimed to study the electrode position on the removal of aqueous solutions of cadmium, lead and copper, using an electrolytic cell with a metallic screen cathode of carbon steel and platinum anode. Removal efficiencies were obtained by analysis of the solutions before and after treatment, using the methodology of cathodic-stripping voltammetry with a mercury drop electrode to quantify the concentrations of Cd2+, Pb22+ and Cu2+. Removal efficiencies were obtained of 94.07% for cadmium, 94.71% for lead and 96.19% for copper, demonstrating that electrolytic removal is an effective technique for the removal of these metals from simulated industrial wastewater.

关键词： Copper Lead Cadmium Electrolytic Removal Effluents Contaminations