Septic tank combined with anaerobic filter and conventional UASB: results from full scale plants

AUTOR(ES)

Silva, F. J. A. da, Lima, M. G. S., Mendonça, L. A. R., Gomes, M. J. T. L.

FONTE

Braz. J. Chem. Eng.

DATA DE PUBLICAÇÃO

2013-03

RESUMO

Anaerobic digestion is an important alternative for domestic wastewater treatment, especially in warm climate regions. Two full-scale anaerobic schemes were investigated: septic tank combined with anaerobic filter (S T A NF) and conventional UASB reactors. Treated effluents from these systems were subjected to disinfection by chlorination. The operational performance of 56 full-scale plants (36 S T A NF and 20 UASB) provided a realistic view. Findings showed that the plants operated with low OLR (< 2.0 kg COD/m³.day). Despite this, the removal of organic material was below values suggested by the literature (around 60% for COD). A removal of 4.0 Log10 units of total coliform and E. coli can be reached with residual chlorine (R CL) of at least 2.0 Cl-Cl2/l. Although UASB plants have performed better, improvement of maintenance is needed in both treatment configurations.

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