Low-temperature post-treatment of anaerobically treated-sewage in anaerobic filter with cationic-polymer addition

T.A. Elmitwalli, R. Raimundo, K. Kujawa-Roeleveld, G. Zeeman

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The post-treatment of domestic sewage pretreated in a 6m3 UASB was investigated in two high-rate anaerobic filter (AF) reactors operated in parallel. The difference between the two AF reactors was only the addition of cationic polymer to the second reactor (AF + P). The reactors were operated at low temperatures, ranged between 13 and 20°C. The media in each AF reactor consisted of vertical sheets of reticulated-polyurethane foam (RPF) with knobs. The results demonstrated that the AF + P reactor (HRT = 3h) with cationic polymer addition (2 mg/L) was an efficient system for post-treatment. The removal efficiencies for total, suspended, colloidal and dissolved COD were, respectively, 41, 86 and 76 and 12% in the AF + P reactor and they were, respectively, 80, 97, 77 and 66% in the UASB + (AF + P) system. The removal of total, suspended and colloidal COD in the UASB + (AF + P) system were significantly higher than those achieved in the UASB + AF system. As hardly any nutrient was removed in the UASB + (AF + P) system, the effluent after pathogen removal is a valuable product for irrigation and fertilisation to close the water and nutrients cycle
Original languageEnglish
Pages (from-to)177-184
JournalWater Science and Technology
Issue number9
Publication statusPublished - 2006


  • domestic sewage
  • water
  • digestion
  • reactors


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