Anaerobic wastewater treatment of concentrated sewage using a two-stage upflow anaerobic sludge blanket- anaerobic filter system

A two-stage pilot-scale upflow anaerobic sludge blanket - anaerobic filter (UASB-AF) reactors system treating concentrated domestic sewage was operated at 23°C and at hydraulic retention times (HRT) of 15 and 4 h, respectively. Excess sludge from the downstream AF stage was returned to the upstream...

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Bibliographic Details
Published in:Journal of environmental science and health. Part A, Toxic/hazardous substances & environmental engineering Toxic/hazardous substances & environmental engineering, 2010-01, Vol.45 (3), p.383-388
Main Authors: Halalsheh, Maha M., Abu Rumman, Zainab M., Field, Jim A.
Format: Article
Language:English
Subjects:
anaerobic filter
Anaerobic treatment
Anaerobiosis
Applied sciences
Blanketing
concentrated sewage
Crack opening displacement
domestic wastewater
Environmental engineering
Environmental science
Exact sciences and technology
Filters
Filters (fluid)
Filtration - methods
General purification processes
Health
HRT
Pollution
Reactors
Sewage
Sludge
Toxicology
Two-stage system
UASB reactor
UASB reactors
Waste Disposal, Fluid - instrumentation
Waste Disposal, Fluid - methods
Wastewater treatment
Wastewaters
Water Purification - instrumentation
Water Purification - methods
Water treatment
Water treatment and pollution
Water treatment plants
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Summary:A two-stage pilot-scale upflow anaerobic sludge blanket - anaerobic filter (UASB-AF) reactors system treating concentrated domestic sewage was operated at 23°C and at hydraulic retention times (HRT) of 15 and 4 h, respectively. Excess sludge from the downstream AF stage was returned to the upstream UASB reactor. The aim was to obtain higher sludge retention time (SRT) in the UASB reactor for better methanization of suspended COD. The UASB-AF system removed 55% and 65% of the total COD (COD tot ) and suspended COD (COD ss ), respectively. The calculated SRT in the UASB reactor ranged from 20-35 days. The AF reactor removed the washed out sludge from the first stage reactor with average COD ss removal efficiency of 55%. The volatile fatty acids concentration in the effluent of the AF was 39 mg COD/L compared with 78 mg COD/L measured for the influent. The slightly higher COD tot removal efficiency obtained in this study compared with a single stage UASB reactor was achieved at 17% reduction in the total volume.
ISSN:1093-4529
1532-4117
DOI:10.1080/10934520903467824