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Type: Artigo de periódico
Title: Pós-treatment Of Wastewater Of Anaerobic Lagoon Using Irrigation [pós-tratamento Do Efluente Doméstico De Uma Lagoa Anaeróbia Utilizando Um Sistema De Irrigação Por Sulcos]
Author: E Souza S.B.S.
Coraucci Filho B.
Bertoncini E.I.
Stefanutti R.
De Figueiredo R.F.
Abstract: The reuse of domestic effluent in agriculture appears as an excellent alternative of destination of treated effluent, because it has advantageous physical and chemical characteristics to agriculture. This research had the proposal to reuse the domestic effluent of an anaerobic lagoon, with an approximate BOD removal efficiency of 50%. Also, the lagoon system allows a reduction in eggs of helminths and protozoan. Reuse was achieved through an irrigation system with flat ridges. The main objective of the research was the determination of adequate application rates of treated effluent to land, according to the best sanitary and agronomic engineering practices, protecting the underground water and having good agricultural production. Three different rates were studied, corresponding to depths of irrigation of 0.20, 0.40 and 0.60 m. The sanitary study was carried out by extracting and analyzing samples from collectors placed in depths of 0.25, 0.50 and 0.75 m, with only effluent, water plus fertilizer, and only water as irrigation feed. The concentrations gotten for nitrate had exceeded the limit of 10 mg.L -1 in 55% of the collected samples, what indicates that the nitrate, in some occasions, is leached in concentrations above the allowed one for the standards of drinking water. The concentrations gotten for nitrit had also exceeded the limit of 1.0 mg.L -1 in agreement with the Resolution 1469/2000 of the Health Department. Such fact occurred in the parcels irrigated both with effluent and water. Moreover, it was observed a reduction around 95% of DBO and 90% of DQO in relation to the effluent applied (DBO of 161 mg.L -1 and DQO of 408 mg.L -1). In relation to the microbiology, the results indicate the presence of total coliforms in the solution of the ground, both in the parcels irrigated with effluent, and with water plus fertilizer. In relation to E. coli, a concentration of the 7.59. 10 3 NMP.100 mL -1 is noticed. The absence of these bacteria was also noticed in areas irrigated only with water.
Rights: fechado
Identifier DOI: 
Date Issue: 2003
Appears in Collections:Unicamp - Artigos e Outros Documentos

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