Avaliação do sistema de tratamento de esgoto doméstico pelo processo de escoamento superficial, pós UASB, da remoção de N e P e da desinfecção via SODIS

• Autor(a) principal: Cabanellas, Cláudia Figueiredo Garrido
• Data de Publicação: 2013
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/748
• topic: Sistema de tratamento de esgoto; Escoamento superficial; SODIS; Sewage treatment system; Runoff; SODIS; CNPQ::CIENCIAS AGRARIAS::ENGENHARIA AGRICOLA

The objective of this study was to evaluate a wastewater treatment system consisting of a primary system, followed by UASB and an overland flow system cultivated with grass Tifton 85, during one year; to analyze the balance of nutrients in the overland flow system and to evaluate the performance of a solar radiation wastewater disinfection system - SODIS. Every 30 to 35 days samples of the influent and the effluent of the UASB, the overland flow system, the grass, the soil, at the depths 0-15 cm and 15-30 cm, and the volatilized nitrogen were collected. It was found that the UASB efficiencies were: BOD 95 and 86%, COD 93 and 88%, NTK 40 and 31%, N-org 85% and 79%, total alkalinity of 193 and 202 mg.L-1, , sulfides 92% and 80%, and SS 97% and 91%, respectively, for the rain and te dry seasons. The overland flow system presented the following efficiencies: BOD 62 and 85%, COD 71 and 72%, ST 6 and 21%, Norg 14 and 35%, NTK 46 and 54%, N- NH3 48 and 21%, PT 46% and 46%, E. coli 1 log unit e 2 log unit, for the rain and the dry seasons, respectively. There was no movement of the elements studied along the first 30 cm of soil. The TKN reduced and the NO3 - increased along the ramp of the overland flow system. The nitrogen volatilization was 0,42% and 0,36%, for the rain and the dry seasons, respectively. There was a reduction of 55% of the Pt in the overland flow system, showing the capacity of Pt absorption for the grass. The grass protein ranged from 13 to 22%. The depths of 15, 20 and 25 cm were tested in the pilot solar radiation disinfection system (SODIS). The wastewater presented an average turbidity of 26 NTU, TSS of 23 mg / L, and 105 to 107 NMP/100ml of E. coli. In the rain season, with a 24 hours of exposure to solar radiation occurred a removal of approximately 4 log of E. coli, when the daily average solar radiation was 25 MJ/m2. In the dry season, after 24 hours of solar exposure approximately 2 log of E. coli was removed, for an average solar radiation of 10 MJ/m2. The E. Coli population reduction was higher for lower depths e the SODIS. The SODIS was not effective to remove the helminthes eggs.