This study investigates the mineralization efficiency, i.e. removal of total organic carbon (TOC) in hospital wastewater by direct ozonation, ozonation with UV radiation (O/UV), homogeneous catalytic ozonation (O/Fe) and homogeneous photocatalytic ozonation (O/Fe/UV). The influence of pH and reaction time was evaluated. For the best process, toxicity and degradation efficiency of the selected pharmaceutical compounds (PhCs) were determined. The results showed that the PhCs detected in the hospital wastewater were completely degraded when the mineralization efficiency reached 54.7% for O/UV with 120 minutes of reaction time using a rate of 1.57 g O h. This process also achieved a higher chemical oxygen demand removal efficiency (64.05%), an increased aromaticity reduction efficiency (81%) and a toxicity reduction.
Amoxicillin (AMX) is a widely used penicillin-type antibiotic whose presence in the environment has been investigated. In this work, the degradation of the AMX in aqueous solutions by ozonation, ozonation with UV radiation (O/UV), homogeneous catalytic ozonation (O/Fe) and homogeneous photocatalytic ozonation (O/Fe/UV) was investigated. The performance results have been compared in terms of removal of amoxicillin and total organic carbon (mineralization efficiency). In all processes, complete amoxicillin degradation was obtained after 5 min. However, low mineralization was achieved. For the best available process, the potential toxicity of AMX intermediates formed after ozonation was examined using a Fish Embryo Toxicity test. Results reveal that O in alkaline solution and O/Fe/UV provide the highest mineralization rates. Ecotoxicity showed that no acute toxicity was observed during the exposure period of 96 h.
Abstract. In June 2009, the Laboratory in hydrology of Nancy (Ansès-LHN, Nancy) conducted an exploratory inter-laboratory proficiency tests (ILT) test in collaboration with the AQUAREF network to identify laboratory practices and estimate inter-laboratory uncertainty for the compounds under study. There were a total of 12 compounds belonging to six families (hormones, antibiotics, non-steroidal antiinflammatory drugs, beta blockers, antipsychotics and others) including one compound used in veterinary medicine. It was the first ILT conducted in France on water intended for human consumption. Thirty-one laboratories participated, 4 of which were located abroad.
Resumo: Este artigo focaliza a formação inicial de licenciandos e sua articulação com professores formadores da universidade e professores de educação básica de uma Escola Pública de Ijuí. Defende-se que a parceria entre estes três grupos de sujeitos contribui para superação da concepção epistemológica com base na racionalidade técnica, que considera o professor apenas um técnico que transmite conhecimentos produzidos por outros e os alunos representam meros objetos onde se depositam informações. Como estratégia de mobilização desses sujeitos e de produção de saberes inerentes à formação docente, relata-se uma experiência vivenciada por uma licencianda do curso de Ciências Biológicas, durante a realização de seu estágio curricular supervisionado. Trata-se do desenvolvimento, em sala de aula, de uma proposta de organização do currículo escolar, denominada Situação de Estudo (SE). Essa visa a desenvolver os conteúdos de Ciências a partir de situações reais, de vivência cotidiana dos estudantes e possibilita permanente reelaboração dos conteúdos escolares. Analisam-se os conceitos de biologia abordados no decorrer do desenvolvimento da SE: Conhecendo o câncer− um caminho para vida (BOFF et al., 2009).
Palavras-chave: Formação docente; Situação de estudo; Estágio curricular.Abstract: This article focuses on teacher education and its relationship with the university teacher and teachers of basic education in a Ijuí Public School. It is argued that the partnership between these three groups of subjects helps to overcome the epistemological conception based on technical rationality, which considers the teacher just a technician who applies the knowledge produced by others, and students represent objects where the information is deposited. As a strategy to mobilize these subjects and production of knowledge inherent in teacher training, reports the experience of a licencianda of Biological Sciences course, during the course of their curricular supervised. It is the development in the classroom, a proposal for the organization of the school curriculum, called Situation Study (SE). This aims to develop the contents of Sciences from real situations of daily life of students and allows permanent reworking of school subjects. It examines the concepts of biology discussed during the development of IF: Understanding cancer-a pathway to life (BOFF, at al, 2009).
The present study investigates the application of a noncommercial peroxidase enzyme, which was extracted from rice bran, to decolorize wastewater that was simulating effluent from a textile manufacturer using a red dye in its coloration process.
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