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RESUMO: A área de investigação do turismo acessível (TA) apresenta uma tendência de crescimento. Contudo, a maioria dos estudos foca-se na acessibilidade física, havendo poucos que analisem as atitudes dos estudantes e profissionais desse setor relativamente às pessoas com deficiência (PcD). Assim sendo, esta revisão tem como objetivo analisar os trabalhos efetuados em outras áreas científicas sobre as atitudes relativamente às PcD. Pretende-se mapear metodologias, instrumentos de medição e principais variáveis e fatores associados às atitudes, para promover a sua inclusão na sociedade. Realizaram-se pesquisas na Scopus, tendo-se obtido 492 registos. Destes, foram selecionados 96 artigos para análise. Os resultados evidenciam que a avaliação das atitudes relativamente às PcD é uma temática de grande relevância em várias áreas científicas. Os estudos utilizam diversos instrumentos para medir essas atitudes. As experiências anteriores, qualidade e frequência do contato com PcD e conhecimento acerca da deficiência têm influência nas atitudes. Contudo, os resultados divergem na influência do perfil sociodemográfico nas atitudes face às PcD. Existe tendência para o recurso a metodologias quantitativas utilizando, como instrumento de recolha de dados, o questionário. O artigo termina identificando áreas de investigação relevantes para o aumento do conhecimento dos fatores que influenciam essas atitudes e, consequentemente, para o desenvolvimento do TA.
ABSTRACT: The investigation area of accessible tourism (AT) has a growing trend. However, most studies focus on physical accessibility, and only a few analyse the attitudes of students and professionals in this sector towards people with disabilities (PwD). This review aims to analyse the work carried out in other scientific areas on attitudes towards PwD. It is intended to map methodologies, measurement instruments and main variables and factors related with attitudes, to promote their inclusion in society. Research was carried out at Scopus and 492 records were obtained. Of these, 96 articles were selected for analysis. Results show that the assessment of attitudes towards PwD is a topic of great relevance in several scientific areas. Studies use several instruments to measure these attitudes. Previous experiences, quality, and frequency of contact with PwD and knowledge about disability have an influence on attitudes. However, results differ in the influence of the sociodemographic profile on attitudes towards PwD. There is a trend towards the use of quantitative methodologies, using the questionnaire as a tool for data collection. The article ends by identifying areas of research relevant to the increasing knowledge of the factors that influence these attitudes and, consequently, to the development of AT.
RESUMO
Concentration polarization is a phenomenon inherent to membrane separation operations and as a precursor of membrane fouling is frequently related to the decrease in the performance of these operations. In the present work, a case-specific mass transfer correlation was developed to assess the concentration polarization when nanofiltration, in different operating conditions, was applied to treat a pharmaceutical wastewater containing atenolol. NF runs with two membranes, two atenolol concentrations and three feed circulating velocities were conducted, and the corresponding experimental mass transfer coefficients were determined using film theory to describe the concentration polarization phenomenon. Higher velocities led to higher mass transfer coefficients and, consequently, lower concentration polarization. These mass transfer coefficients were correlated with the circulating velocity (Re), the solute diffusivity (Sc) and the membrane permeability (LP +) (the membrane is a permeable interface with effect on the concentration profiles developed from the interface towards the bulk feed), yielding the following correlation Sh = 1.98 × 104Re0.5Sc0.33LP +0.32. The good agreement between the calculated and the experimental results makes this correlation a valuable tool for water practitioners to predict and control the concentration polarization during atenolol-rich wastewater treatment by nanofiltration, thereby increasing its productivity and selectivity.
Assuntos
Filtração , Purificação da Água , Atenolol , Membranas Artificiais , Águas ResiduáriasRESUMO
Concentration polarization is intrinsically associated with the selective character of membranes and often means flux decline and which causes a subsequent decrease of ultrafiltration and nanofiltration performance. More important is the fact that it acts as a precursor of membrane fouling and creates severe fouling problems in the longer times range. The quantification of its dependence on the operating parameters of cross-flow velocities and transmembrane pressures makes recourse to the film theory to introduce mass-transfer coefficients that generally are calculated by dimensionless correlations of the Sherwood number as a function of the Reynolds and Schmidt numbers. In the present work, the mass-transfer coefficients are obtained through the fitting of experimental results by the pressure variation method. The ultrafiltration/nanofiltration of the winery wastewaters from the racking operation is carried out with the membranes ETNA 01PP (Alfa Laval) and NF 270 (Dow Filmtec) under a wide range of cross-flow velocities and transmembrane pressures up to 15 bar.