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A system consists of an up-flow anaerobic sludge blanket (UASB) and a continuous flow sequencing batch reactor (contflow SBR) was operated under different retention times. UASB was tested at 2.8, 4.4, then 5.7 hrs. The average chemical oxygen demand (COD) removal in UASB was 51.5 % on average. Cont-flow SBR was tested at 4 to 6 and then at 8 hrs cycle periods. The results indicated that the ability of the pilot plant to work under different retention times with removal efficiencies for COD, TN, and phosphate up to 96.5%, 62.6 %, and 35.9% respectively. The main advantage of the proposed treatment system is the minimization of investment and operational costs as compared to the use of cont-flow SBR systems alone.

Performance of up-flow anaerobic sludge blanket followed by continuous-flow sequencing batch reactor