Low-temperature post-treatment of anaerobically treated-sewage in anaerobic filter with cationic-polymer addition.
The post-treatment of domestic sewage pretreated in a 6 m3 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 degrees 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 = 3 h) 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.
Elmitwalli
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TA
Department of Civil Engineering, Benha High Institute of Technology, Benha EI-Gedida, Egypt. t_elmitwalli@yahoo.com
Raimundo
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Kujawa-Roelevel
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K
Zeeman
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G
D000693:Anaerobiosis; D002412:Cations; D005160:Facility Design and Construction; D005374:Filtration; D011108:Polymers / Q000737:chemistry*; D011140:Polyurethanes / Q000737:chemistry; D012722:Sewage / Q000737:chemistry*; D013696:Temperature; D014874:Water Pollutants, Chemical / Q000032:analysis*; D018508:Water Purification / Q000295:instrumentation / Q000379:methods*
D002412:Cations; D011108:Polymers; D011140:Polyurethanes; D012722:Sewage; D014874:Water Pollutants, Chemical; C028279:polyurethane foam