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VAZAO E TRATAMENTO SECUNDARIO DE ESGOTO DOMESTICO EM ESTACAO DE PEQUENO PORTE COM SISTEMA DE ZONA DE RAIZES     ANA CLAUDIA OLIVEIRA SERVULO1; JEANE DA SILVA TAVARES2RODRIGO MOURA PEREIRA3E DELVIO SANDRI4   1Doutoranda, Programa de Pos Graduacao em Agronomia, Universidade de Brasilia (UnB),Faculdade de Agronomia e Medicina Veterinaria (FAV), Campus Universitario Darcy Ribeiro, ICC Centro,Asa Norte CEP 70.910-900 – Brasilia, Brasil, e-mail: anaclaudiaoservulo@hotmail.com. 2Aluna de graduacao, Universidade de Brasilia (UnB),Faculdade de Agronomia e Medicina Veterinaria (FAV), Campus Universitario Darcy Ribeiro, ICC Centro,Asa Norte CEP 70.910-900 – Brasilia, Brasil, e-mail:jeanesilva2512@hotmail.com. 3Doutorando, Universidade de Brasilia (UnB),Faculdade de Agronomia e Medicina Veterinaria (FAV), Campus Universitario Darcy Ribeiro, ICC Centro,Asa Norte CEP 70.910-900 – Brasilia, Brasil, e-mail: rodrigomoura@agricola.eng.br. 4Prof. Associado 1, Universidade de Brasilia (UnB),Faculdade de Agronomia e Medicina Veterinaria (FAV), Campus Universitario Darcy Ribeiro, ICC Centro,Asa Norte CEP 70.910-900 – Brasilia, Brasil, e-mail: sandri@unb.br.     1 RESUMO   O sistema de zona de raizes (SZR) e uma alternativa para tratamento de esgotos, cuja eficiencia depende do material de suporte, composicao do esgoto, especie de macrofita e tempo de detencao hidraulica (TDH). Objetivou-se avaliar a medicao de vazoes de afluente e efluente de esgoto dos SZR com o uso de hidrometro e metodo direto volumetrico(MDV) e a eficiencia de diferentes especies de macrofitas na remocao de atributos fisicos e quimicos do efluente. O esgoto bruto e gerado nos sanitarios e restaurante universitario da Fazenda Agua Limpa -UnB. Quatro leitos de tratamento foram utilizados: nao cultivado, SZR com C. giganteus, Typha sppe H. rostrata. As avaliacoes ocorreram em quatro dias distintos. A evapotranspiracao potencial (ETP) dos leitos foi obtida pela razao entre a diferenca de volumes de afluente e efluente e a area superficial dos leitos. O hidrometro nao foi adequado na medida do volume de afluente, recomendando-se o MDV. A maior ETP ocorreu no SZR com Typha spp (9,98 mm dia-1)seguido do C. giganteus(9,37 mm dia-1).O maior valor de TDH foi de 9,49 dias e o menor de 4,68 dias. O oxigenio dissolvido, pH, turbidez e solidos totais atendem aos limites para lancamento em corpos hidricos de classe 2.   Palavras-chaves: macrofita, agua residuaria, leito cultivado.     SERVULO, A.C.O.; TAVARES, J.S.; PEREIRA, R.M.; SANDRI, D. FLOW RATES AND SECONDARY TREATMENT OF WASTEWATER IN SMALL-SCALE TREATMENT PLANT WITH ROOT ZONE SYSTEM     2 ABSTRACT   The root treatment wetland (RTW) is a low cost option to wastewater treatment, which efficiency depends on support material, wastewater composition, macrophyte specie and hydraulic detention time (HDT). This paper aimed to test the performance of the hydrometer and the volumetric method (VM)on measurement of effluentflow, and the removal efficiency of different macrophyte species over physical and chemical effluent attributes. The wastewater was from the bathrooms and restaurant in the experimental farm of the University of Brasilia. Four constructed wetlands were used: free water system (FWS), RTW with Cyperus giganteus, with Typha spp and with Heliconia rostrata. The evaluation occurred in four days isolated. The systems’ potential evapotranspiration (PET) was determinate by the quocient of affluent-effluent volumes balance and the wetland surface area. The hydrometer didn’t measure affluent flow properly, recommending the VM. The highest PET was on RTW-Typha spp (9.98 mm day-1), followed by C. giganteus (9.37 mm day-1). The highest HDT was 9,49 days and the lowest was 4.68 days. The dissolved oxygen, pH, turbidity and total solids content are fit the Brazilian legal requirements for release into class 2 receiving bodies.   Keywords: macrophytes, sewage, wetland.

VAZÃO E TRATAMENTO SECUNDÁRIO DE ESGOTO DOMÉSTICO EM ESTAÇÃO DE PEQUENO PORTE COM SISTEMA DE ZONA DE RAÍZES