1 DIMENSIONAMENTO, AVALIAÇÃO POTENCIAL DE PRODUÇÃO DE METANO E ANÁLISE DE CUSTO DE DIGESTORES ANAERÓBIOS PARA TRATAMENTO DE DEJETOS PRODUZIDOS NA SUINOCULTURA DESIGNING, POTENTIAL METHANE PRODUCTION ASSESSMENT AND COST ANALYSIS OF ANAEROBIC DIGESTERS FOR PIG MANURE TREATMENT Flávia Junqueira de Macedo 1 * Jorge Manuel Rodrigues Tavares 1 Paulo Belli Filho 1 Arlei Coldebella 2 Paulo Armando Victória de Oliveira 2 Abstract The aim of the study is to design anaerobic digesters units for pig manure treatment in Santa Catarina, Brazil. It is on interest to understand the impact that water management and savings have in anaerobic digestion in terms of sizing of the digester, methane production and capital costs. Therefore, two scenarios were evaluated: the first with values of the current legislation (7.0 L·pig -1 ·d -1 ) and the second from the value of manure determined in growing- finishing pig units at Santa Catarina (5.0 L·pig -1 ·d -1 ). Two designing parameters were used: Hydraulic Retention Time and Organic Load. Therefore, the potential production of methane (CH 4 ) was determined and the costs were estimated. The volume difference between the two scenarios was 29% and the CH4 production was 2.42 higher for scenario 2 (5.0 L·pig -1 ·d -1 and 45.7 g·L -1 of VS in manure). The total costs of implementation were higher or lower depending on the parameter project analyzed: considering the digester volume, the scenario 2 showed to be more expensive per m3. If the CH 4 potential production is taken into account, the digesters for the same scenario will be the cheapest ones. Key Words: Pig manure, anaerobic digesters, design, methane potential production. 1 Departamento de Engenharia Sanitária e Ambiental, Universidade Federal de Santa Catarina. 2 Empresa Brasileira de Pesquisa Agropecuária, Suínos e Aves. * Autor corresponsal: Departamento de Engenharia Sanitária e Ambiental, Universidade Federal de Santa Catarina, Campus Reitor João David Ferreira Lima, Caixa Postal 476 – Bairro Trindade - Florianópolis - Santa Catarina - Brasil - CEP 88040-970 – Tel.:+55(48)3721-7743. flaviajmacedo@gmail.com