Clogging tendency has been analyzed in sandy soil soakaways at pilot scale receiving either septic tank effluent (SUM1) or UASB effluent (SUM2) and also at laboratory scale (SUMB1 and SUMB2), in relation to Chemical Oxygen Demand (COD) and accumulated Suspended Solids (SS) concentrations. Clogging was also estimated, by modeling the predicted time for infiltration hydraulic failure. The laboratory results obtained with SUMB1 and SUMB2 confirmed the results obtained for SUM1 and SUM2, showing that soakaways built in sandy soils which receive effluent from septic tanks treating predominantly domestic wastewater tended to clog 58% faster than those receiving UASB effluent. The good correlation observed between the decrease in average infiltration rate and the time of operation suggests that the UASB reactor is a promising technological alternative to septic tanks as a pre-treatment prior to effluent soil disposal for on-site decentralized wastewater treatment systems.Keywords: decentralized treatment; UASB; septic tank; infiltration; sandy soil. RESUMOO trabalho objetivou comparar o tempo para ocorrer a colmatação de sumidouros (SUM1 e SUM2) contendo areia média, alimentados respectivamente por efluentes de tanque séptico e de um reator UASB, em escala piloto e com replicação confirmativa em escala de bancada (SUMB1 e SUMB2), quanto ao impacto da concentração acumulada de Demanda Química de Oxigênio (DQO) e dos Sólidos Suspensos Totais (SST) na colmatação do meio, em função do tempo. Estimou-se ainda, por meio de um modelo, a predição do tempo para a falha hidráulica. A colmatação do SUMB1 à frente do SUMB2 confirmou os resultados de campo obtidos para os SUM1 e SUM2, demonstrando que sumidouros construídos e operados recebendo esgoto doméstico tratado em tanque séptico em solos arenosos tenderão a colmatar 58% mais rápido do que aqueles com tratamento prévio em reatores UASB. A boa correlação entre o decréscimo da taxa média de infiltração nos sumidouros em função de período de operação sugere o reator UASB como promissora alternativa aos tanques sépticos para disposição de efluentes no solo em sistemas descentralizados unifamiliares de tratamento de esgotos.Palavras-chave: tratamento descentralizado; reator UASB; Tanque Séptico; infiltração; solo arenoso.
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