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Evaluation of eucalyptus seedlings development submitted to irrigation using landfill leachate treated by electrolysis

Grant number: 12/20282-8
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): December 01, 2012
Effective date (End): November 30, 2013
Field of knowledge:Interdisciplinary Subjects
Principal Investigator:Peterson Bueno de Moraes
Grantee:Raíssa Olívia Barbacena
Home Institution: Faculdade de Tecnologia (FT). Universidade Estadual de Campinas (UNICAMP). Limeira , SP, Brazil

Abstract

The landfill leachate is known for its toxic properties. Moreover this effluent is highly pollutant. Thus, research of processes for effective treatment and destinations for this type of effluent are suitable to be able to reduce its the environmental impact. One possible treatment is the electrolytic treatment using oxides electrodes, which generally reduce color, toxicity and organics and does not generate sludge. However, under specific experimental conditions such as presence of chlorides, the electro-oxidation of pollutants may be incomplete, causing residual toxicity. Therefore the monitoring of toxicity is extremely important as a tool for the treatment optimization and checking of environmental compatibility. It is well known that landfill leachate is rich in nutrients (including nitrogen, phosphorus and potassium) and may also contain micronutrients (such as zinc and boron), both essential for the growth and development of plants and forest species, such as eucalyptus. Eucalyptus is used in obtaining wood, pulp and paper, and essential oils to obtain energy by burning. Therefore, we propose apply the electrolytic treatment aiming to minimize their toxicity before its application in irrigation of eucalyptus. The biodegradability of leachate in the soil will be determined by Bartha's respirometry tests. Tests to determine ion leaching will be carry out through analysis of pH, conductivity, ammonia and nitrates. Also we will quantify the concentration of heterotrophic bacteria and fungi in soil besides the phytotoxicity assays from the eucalyptus culture irrigated with the effluent.