The investigation was conducted to examine the effectiveness of a double-media anaerobic filter (AF) process for the biogas production and chemical oxygen demand (COD) degradation rate from grape winery wastewater. The experiment was carried in three identical filters,which were a soft and hard packing double-media (SHM) AF,a soft packing single-media(SM) AF,and the hard packing single-media (HM) AF. The results show that the SHM AF for COD removing rate is the best when hydraulic retention time (HRT) is 4days and volume organic loading rate (OLR) is 1.86 kgCOD/m3.d. Meanwhile COD degradation rate is 87.46%,72.06%,and 75.32% in three filters; biogas production is 0.43/m3/kgCODremoved,0.35/m3/ kgCODremoved,0.32/m3/kgCODremoved respectively; COD degradation rate is 90.95% in SHM AF when OLR is 1.86 kgCOD/m3.d and HRT is 7days. However,if we extend the HRT,COD degradation rate has no significant change,and gas production is lower than before.
展开▼
