title: Low temperature pre-treatment of domestic sewage in an anaerobic hybrid or an anaerobic filter reactor.
abstract: The pre-treatment of domestic sewage for removal of suspended solids (SS) at a process temperature of 13 degrees C and an hydraulic retention time (HRT) of 4 h was investigated in an anaerobic filter (AF) and anaerobic hybrid (AH) reactor. The AF and the top of the AH reactor consisted of vertical sheets of reticulated polyurethane foam (RPF) with knobs. All biomass in the AF was only in attached form to avoid clogging and sludge washout. The AF reactor showed a significantly higher removal of total and suspended chemical oxygen demand (COD) than the AH reactor, respectively, 55% and 82% in the AF reactor and 34% and 53% in the AH reactor. Because the reactors were operated at a short HRT and low temperature, the hydrolysis, acidification and methanogenesis based on the influent COD were limited to, respectively, 12%, 21% and 23% for the AF reactor and 12%, 17% and 16% for the AH reactor. The excess sludge from the AH reactor was more stabilised and had a better settling capacity and dewaterability. However, the excess sludge from both the AH and AF reactors needed stabilisation. Therefore, the AF reactor is recommended for the pretreatment of domestic sewage at low temperatures.
authors: Department of Agricultural, Environmental and Systems Technology, Sub-Department of Environmental Technology, Wageningen Agricultural University, The Netherlands.
authors: Tarek A
authors: TA
authors: Elmitwalli
authors: Vladimir
authors: V
authors: Sklyar
authors: Grietje
authors: G
authors: Zeeman
authors: Gatze
authors: G
authors: Lettinga
mesh_terms: D000693:Anaerobiosis; D001709:Biotechnology / Q000379:methods; D006868:Hydrolysis; D007220:Industrial Waste; D008697:Methane / Q000378:metabolism; D010100:Oxygen / Q000378:metabolism; D011140:Polyurethanes / Q000737:chemistry; D012037:Refuse Disposal / Q000379:methods*; D012722:Sewage; D013696:Temperature; D013997:Time Factors
chemical_list: D007220:Industrial Waste; D011140:Polyurethanes; D012722:Sewage; D008697:Methane; D010100:Oxygen