Treatment of strong domestic sewage in a 96 m3 UASB reactor operated at ambient temperatures: two-stage versus single-stage reactor

M.M.I. Halalsheh, Z. Sawajneh, M. Zu'bi, G. Zeeman, J.B. van Lier, M. Fayyad, G. Lettinga

Research output: Contribution to journalArticleAcademicpeer-review

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Abstract

A 96 m(3) UASB reactor was operated for 2.5 years under different conditions to assess the feasibility of treating strong sewage (CODtot = 1531 mg/l) at ambient temperatures, with averages of 18 and 25 degreesC 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 CODtot and CODss 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 CODtot 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 single-stage reactor was well-stabilized and exerted an excellent settlability. During the last three months of research, sludge was discharged regularly from the single-stage UASB reactor. The results showed no significant improvement in the performance in terms of CODtot. Based on the results of the experiment, a single-stage UASB reactor operated at relatively long HRT is preferred above two-stage system at the Jordanian conditions. (C) 2004 Elsevier Ltd. All rights reserved.
Original languageEnglish
Pages (from-to)577-585
JournalBioresource Technology
Volume96
Issue number5
DOIs
Publication statusPublished - 2005

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Sewage
sewage
temperature
Temperature
Effluents
Stabilization
sludge
summer
reactor
Experiments
effluent
winter
experiment

Keywords

  • anaerobic treatment
  • waste-water
  • sludge
  • hybrid

Cite this

Halalsheh, M.M.I. ; Sawajneh, Z. ; Zu'bi, M. ; Zeeman, G. ; van Lier, J.B. ; Fayyad, M. ; Lettinga, G. / Treatment of strong domestic sewage in a 96 m3 UASB reactor operated at ambient temperatures: two-stage versus single-stage reactor. In: Bioresource Technology. 2005 ; Vol. 96, No. 5. pp. 577-585.
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abstract = "A 96 m(3) UASB reactor was operated for 2.5 years under different conditions to assess the feasibility of treating strong sewage (CODtot = 1531 mg/l) at ambient temperatures, with averages of 18 and 25 degreesC 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 CODtot and CODss 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 CODtot 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 single-stage reactor was well-stabilized and exerted an excellent settlability. During the last three months of research, sludge was discharged regularly from the single-stage UASB reactor. The results showed no significant improvement in the performance in terms of CODtot. Based on the results of the experiment, a single-stage UASB reactor operated at relatively long HRT is preferred above two-stage system at the Jordanian conditions. (C) 2004 Elsevier Ltd. All rights reserved.",
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Treatment of strong domestic sewage in a 96 m3 UASB reactor operated at ambient temperatures: two-stage versus single-stage reactor. / Halalsheh, M.M.I.; Sawajneh, Z.; Zu'bi, M.; Zeeman, G.; van Lier, J.B.; Fayyad, M.; Lettinga, G.

In: Bioresource Technology, Vol. 96, No. 5, 2005, p. 577-585.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Treatment of strong domestic sewage in a 96 m3 UASB reactor operated at ambient temperatures: two-stage versus single-stage reactor

AU - Halalsheh, M.M.I.

AU - Sawajneh, Z.

AU - Zu'bi, M.

AU - Zeeman, G.

AU - van Lier, J.B.

AU - Fayyad, M.

AU - Lettinga, G.

PY - 2005

Y1 - 2005

N2 - A 96 m(3) UASB reactor was operated for 2.5 years under different conditions to assess the feasibility of treating strong sewage (CODtot = 1531 mg/l) at ambient temperatures, with averages of 18 and 25 degreesC 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 CODtot and CODss 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 CODtot 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 single-stage reactor was well-stabilized and exerted an excellent settlability. During the last three months of research, sludge was discharged regularly from the single-stage UASB reactor. The results showed no significant improvement in the performance in terms of CODtot. Based on the results of the experiment, a single-stage UASB reactor operated at relatively long HRT is preferred above two-stage system at the Jordanian conditions. (C) 2004 Elsevier Ltd. All rights reserved.

AB - A 96 m(3) UASB reactor was operated for 2.5 years under different conditions to assess the feasibility of treating strong sewage (CODtot = 1531 mg/l) at ambient temperatures, with averages of 18 and 25 degreesC 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 CODtot and CODss 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 CODtot 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 single-stage reactor was well-stabilized and exerted an excellent settlability. During the last three months of research, sludge was discharged regularly from the single-stage UASB reactor. The results showed no significant improvement in the performance in terms of CODtot. Based on the results of the experiment, a single-stage UASB reactor operated at relatively long HRT is preferred above two-stage system at the Jordanian conditions. (C) 2004 Elsevier Ltd. All rights reserved.

KW - anaerobic treatment

KW - waste-water

KW - sludge

KW - hybrid

U2 - 10.1016/j.biortech.2004.06.014

DO - 10.1016/j.biortech.2004.06.014

M3 - Article

VL - 96

SP - 577

EP - 585

JO - Bioresource Technology

JF - Bioresource Technology

SN - 0960-8524

IS - 5

ER -