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Treatment of raw domestic sewage in an UASB reactor

1989; Elsevier BV; Volume: 23; Issue: 12 Linguagem: Inglês

10.1016/0043-1354(89)90112-7

1879-2448

Rodrigo de Andrade Barbosa, Geraldo L. Sant’Anna,

Membrane Separation Technologies

The treatment of raw domestic sewage at ambient temperatures in an upflow anaerobic sludge blanket (UASB) reactor with a volume of 120 l. and a height of 1.92 m was studied. The sewage had an average BOD5 of 357 mg l−1 and COD of 627 mg l−1. Approximately 75% of the organic materials were in the suspended fraction. The sewage temperature ranged from 18 to 28°C during the experimental period. The reactor operated continuously for 9 months and assessed self-inoculation and raw domestic sewage purification. The unit was started without inoculum and ran during the entire experimental period with a hydraulic retention time of 4 h. During the experiment, a sludge bed build-up was observed. At the end of the experimental period, the predominance of spherical granular particles up to 6–8 mm in diameter was evident. After a 4-month operation, it was observed that the inoculation/acclimatization steps had been concluded. Removal efficiencies of BOD5 = 78%, COD = 74% and TSS = 72% were obtained. A typical gas production factor of 80 l kg−1 COD added was observed and the CH4 content of the biogas was 69%.