A interferência de diferentes níveis de radiação solar no tratamento de esgoto sanitário em lagoas de alta taxa

• Autor(a) principal: Alves, Luna Gripp Simões
• Data de Publicação: 2012
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/3781
• topic: Microalgas; Lagoas de alta taxa; Tratamento de esgoto; Microalgae; High rate algal ponds; Wastewater treatment; CNPQ::ENGENHARIAS::ENGENHARIA SANITARIA::SANEAMENTO AMBIENTAL

The integration between wastewater treatment in high rate algal ponds (HRAPs) and microalgae culture, aiming biomass production, has been largely discussed, in order to reduce costs associated with both process. Nevertheless, for that association being feasible, it is still necessary reaching in the field the observed productivity in the laboratory scales. In many cases, this lack is due to the fact that when microalgae are exposed to high sunlight rates, sunlight saturation and photoinibition effects may influence their growth. On the other hand, solar radiation represents an important factor in the pollutants removal on HRAPs. The aim of this work was to evaluate the influence of different levels of solar radiation on the wastewater treatment efficiency of the HRAP, specifically on the removal of nutrients and indicator microorganisms, trough the use of different covers in high rate ponds fed with UASB effluent. Reductions of 22, 30 and 60% of the natural Photosynthetically Active Radiation (PAR) (1.920 μE.m-2.s-1) were assessed. A 30% reduction on the PAR resulted on greatest values of dissolved oxigen, whereas a 60% reduction resulted on smallest values of pH and temperature. Concerning nitrogen removal, the 20% reduction showed to be more efficient for total kjeldahl nitrogen and ammonium removal. The variation on PAR did not influence Phosphorus or indicator microorganisms removal. The observed productivity, from 5,3 to 7,4g.m-2.d-1, and pollutants removal efficiency (45 to 61% for TKN, 58 to 78% for NH3, 9 to 16% for total Phosphorus and from 1.5 to 2.0 removed logs for total coliforms and E.coli) support the viability of the association between algal biomass production and wastewater treatment.