Hydroponic farms produce wastewater that need to be treated before being released into the environment. A three-step screening process (microplate, batch, and semi-continuous flasks experiments) initially designed to select an efficient microalgae strain allowed the isolation of a consortium that naturally developed in the hydroponic farm wastewater. During the non-optimized semi-continuous experiments, the best performing microalgae strain, Scenedesmus obliquus UTEX393 and the wastewater-born consortium cultures achieved good average linear growth rate (0.186 and 0.198/d, respectively) and high average nitrogen removal rates (23.5 mgN/L/d and 21.9 mgN/L/d, respectively). Phosphorus removal was very high probably due to precipitation. An integrated process was designed to treat the hydroponic farm wastewater using the wastewater-born consortium. Despite relatively low coagulation efficiencies in the preliminary tests, when integrated in a continuous process, chitosan was efficient to harvest the naturally wastewater-born consortium. The process was also efficient for removing nitrate and phosphate in less than seven days (average removal of 98.2 and 87.1% for nitrate and phosphate, respectively). These very promising results will help to define a pre-industrial pilot process.
ResumoUma Universidade Sustentável desenvolve ações nas diferentes dimensões da sustentabilidade, assumindo um sistema de gestão ambiental na própria instituição e contribuindo para a formação de jovens com pensamento crítico. Adotou-se a análise de conteúdo, para abordar a evolução histórica da preocupação ambiental em três diferentes versões do Plano de Desenvolvimento Institucional de uma Instituição de Ensino Superior (IES) na Bahia, e efetuaram-se apontamentos sobre o estágio de sustentabilidade da IES. Hoje, a sustentabilidade na sede da universidade reflete processo histórico associado à sua origem e estratégia da multicampia. Esforços induziram os primeiros projetos coletivos, mas sem uma continuidade de longo prazo e metas quantificáveis, prevalecendo ações individuais e pontuais. A adoção dos Objetivos do Desenvolvimento Sustentável 2030 contribuiria ao enfrentamento dos desafios que se apresentam para a sustentabilidade universitária. Palavras-chave:Universidade, Educação Ambiental, Ambientalização. AbstractA Sustainable University develops actions in the different dimensions of sustainability, assuming an environmental management system in the institution itself and contributing to the formation of critical thinking for young people. Content analysis was chosen to discuss the historical evolution of environmental concern in three different versions of the Institutional Development Plan of a Higher Education Institution (HEI) in the state of Bahia, as well as notes on the sustainability stage of HEI. Currently, sustainability on the university's campus reflects the historical process associated with its origin and multicamp strategy. Efforts induced the first collective projects, but without a long-term continuity and quantifiable goals, individual and specific actions prevailing. The use of the Sustainable Development Objectives 2030 would help to face the challenges that are presented for university sustainability.
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