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This research studied the effect of excess discarding secondary sludge to UASB reactors for thickening and digestion in the full-scale sewage treatment plant (STP) Laboreaux in Itabira Minas Gerais. The effect of sludge excess discarding was evaluated based on COD, TSS and SSed removals through the operation of the reactors in 4 stages. The initial stage had an HRT of 18 hours and the others stages had a mean HRT of 9 hours. During the study, 636 days, the reactors received sludge from excess discharge in hourly cycles of 30 min, 24 hours per day. The results showed efficiency of removal of COD 75%, TSS 85% and SSed 95%. In general, excess sludge discarding proved to be an advantageous technique applicable to anaerobic stations with aerobic post-treatment units (UASB+FBP), with the operational problems mentioned so far caused by management of sludge in the UASB.

revista dae

Avaliação do descarte de excesso de lodo secundário de FBP sobre o desempenho de reatores UASB em escala plena: estudo de caso da ETE Laboreaux Itabira-MG