Macrophytes of the Sanitary Effluent Treatment System of the Tubarão Port Complex and its Potential as a Source of Nutrients

Author(s): VILELA, Adriano Dutra
Summary: Domestic sewages are discharged directly into natural water bodies causing water sources contamination. Thus, there is a reduction in drinking water resevoir, being considerated a public health problem. The development of treatment systems of these effluents has become a priority, specially in urban centers. Wastewater treatment ponds is a process from the action of aerobic and anaerobic bacterias as well as incidence of ultraviolet rays. This technique has been widely used since it has an easy deployment and low operational costs. On the other hand, some problems in this technique have resulted in a decrease of treatment efficiency. Eutrophication process is one of these problems, which is caused by the accumulation of algae and macrophytes in the ponds, requiring landfill disposal costs and routine pond cleaning. In this context, the study aims to evaluate the nutritional content of the organic compound (OC) formed by natural dehydration of macrophytes removed from the Wastewater Stabilization Pond (WSPs), located inTubarão Porto Complex, Vitória - ES, Brazil. Furthermore, it will also evaluated the nutritional effect of organic compound for agricultural use and recovering of degraded areas. During the study, soil samples from a degraded area were collected at depths of 0-20 cm, which were characterized physically and chemically in the Soil Science Laboratory at Federal University of Lavras (UFLA). Soil test results indicated loamy, nutrient-poor and acid soil. The OC was analysed in the Soil and Plant Analysis Laboratory at Campinas Agronomic Institute (IAC), showing favorable nutritional contents for agricultural use and recovering of soil. Since the nutritional contents of OC were obtained, experiments in pots were performed in order to get a practical assessment on the viability of its use. Soil samples previously analized were distributed in non-randomized block and received different OC fractions with both soil basic correction and no basic correction. Brachiaria, which is a grass widely grown in pasture, was used as an indicator. The experiment was conducted during 138 days to evaluate the ideal 7 fraction of the OC to be applied in t / ha able to replace or supplement conventional fertilization.
Year: 2016
Pages: 95 f.
Year of publication: 2016
Supervision: Nei Rivello
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Course: Master's Degree in Sustainable Use of Natural Resources in Tropical Regions