Treatment of domestic sewage in a two-step anaerobic filter/anaerobic hybrid system at low temperature.
The treatment of domestic sewage at low temperature of 13 degrees C 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 13 degrees C 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.
Sub-Department of Environmental Technology, Wageningen University, The Netherlands.
Tarek A
TA
Elmitwalli
Kim L T
KL
Oahn
Grietje
G
Zeeman
Gatze
G
Lettinga
D001420:Bacteria, Aerobic / Q000502:physiology; D001421:Bacteria, Anaerobic / Q000502:physiology; D019149:Bioreactors; D005374:Filtration; D010100:Oxygen / Q000378:metabolism; D012722:Sewage; D013696:Temperature; D014329:Tropical Climate; D014865:Waste Disposal, Fluid / Q000379:methods*
D012722:Sewage; D010100:Oxygen