| Thermal-hydrolysis can remarkably improve the solid organics dissolving efficiency of urban biomass waste,and anaerobic sequencing batch reactor (ASBR) was used to improve the efficiency of urban biomass waste anaerobic digestion. The optimum thermal-hydrolysis temperature and holding time was 175℃ and 60 min,the volatile suspended solid (VSS) dissolving ratio of kitchen waste,fruit-and-vegetable waste and sludge were 31.3%,31.9% and 49.7%,respectively. Two ASBR and one continuous-flow stirred tank reactor (CSTR) were started at hydraulic retention time (HRT)=20 d,COD organic loading rate (OLR)=3.2-3.6 kg/(m3·d). The biogas production volumes were 5 656mL/d(A1),6 335mL/d(A2) and 3 103mL/d(CSTR),respectively; VSS degradation ratios were 45.3% (A1),50.87% (A2),20.81% (CSTR),and the total COD (TCOD) removal rates were 88.1% (A1),90% (A2),72.6% (CSTR). In ASBR,organic solid and anaerobic microorganism were remained in the reactor during settling period. When HRT was 20 d,the solid retention time (SRT) was over 130 d,which made ASBR higher efficiency than CSTR. |
