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Treatment of strong domestic sewage in a 96 m UASB reactor operated at ambient temperatures: two-stage versus single-stage reactor by M. Halalsheh; Z. Sawajneh; M. Zu’bi; G. Zeeman; J. Lier; M. Fayyad; G. Lettinga is a Engineering article available to read on EtoBox.

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A 96 m 3 UASB reactor was operated for 2.5 years under different conditions to assess the feasibility of treating strong sewage (COD tot = 1531 mg/l) at ambient temperatures with averages of 18 and 25 °C for winter and summer respectively. During the first year, the reactor was operated as a two-stage system at OLRs in the range of 3.6-5.0 kg COD/m 3 d for the first stage and 2.9-4.6 kg COD/m 3 d for the second stage. The results of the first stage showed average removals of 51% and 60% for COD tot and COD ss respectively without significant effect of temperature. The second stage reactor was unstable. The temperature affected sludge stabilization. During the second year, the first stage was operated as a single-stage UASB reactor at half of the previous loading rates. The results showed an average removal efficiency of 62% for COD tot during summer, while it dropped to 51% during wintertime. However, the effluent suspended solids were stabilized with VSS/TSS ratio around 0.50 all over the year. The sludge in the singlestage reactor was well-stabilized and exerted an excellent settlability. During the last three months of research, sludge was discharged regularly from the single-st

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Author

M. Halalsheh; Z. Sawajneh; M. Zu’bi; G. Zeeman; J. Lier; M. Fayyad; G. Lettinga

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0960-8524)

Published

2005

Language

EN

Field

Engineering (Physical Sciences)