Journal
WATER RESEARCH
Volume 36, Issue 9, Pages 2225-2232Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0043-1354(01)00438-9
Keywords
wastewater treatment; domestic sewage; anaerobic digestion; anaerobic filter; anaerobic hybrid; polyurethane foam; two step system
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The treatment of domestic sewage at low temperature of 13degreesC was investigated in a two-step system consisting of an anaerobic filter (AF) + an anaerobic hybrid (AH) reactor operated at different hydraulic retention times (HRTs). The AF reactor was efficient in the removal of suspended COD, viz. 81%, 58% and 57% at an HRT of, respectively, 4, 2 and 3 h. For optimisation of the removal of suspended COD and dissolved COD, an HRT of 4 + 4 h is required for the AF + AH system. For additional optimisation of colloidal COD removal, the AH reactor needs an HRT of 8 h. The AF + AH system operated at an HRT of 4 + 8 h at 13degreesC provided a high removal efficiency for all COD fractions. The achieved total COD removal was as high as 71% which is similar to values found in tropical areas. Moreover, 60% of the removed COD was converted to methane. (C) 2002 Elsevier Science Ltd. All rights reserved.
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