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出 处:《环境科学》2010年第2期526-533,共8页Environmental Science
基 金:国家高技术研究发展计划(863)项目(2008AA062401);北京市科技计划项目(D08040600350802)
摘 要:通过热水解预处理提高城市生物质废物的固体有机物溶解率,使用厌氧序批式反应器(ASBR)提高生物质废物厌氧消化效率.结果表明,热水解的优化条件为175℃、60min,餐厨垃圾、果蔬垃圾和污泥的挥发性悬浮固体(VSS)的溶解率分别为31.3%、31.9%和49.7%.热水解后餐厨垃圾、果蔬垃圾和污泥中液态有机物占总有机物的比例分别为54.28%、58.14%和40.91%.在水力停留时间(HRT)20d的条件下,2个ASBR反应器(简称A1和A2)与1个连续流完全混合反应器(CSTR,简称C)同时启动,COD容积负荷3.2~3.6kg/(m^3·d),3个反应器的平均日产气量分别为:5656mL/d(A1)、6335mL/d(A2)、3103mL/d(C);VSS的降解率分别为45.3%(A1)、50.87%(A2)、20.81%(C).TCOD的去除率分别为88.1%(A1)、90%(A2)、72.6%(C).ASBR反应器通过沉降使固体有机物和厌氧微生物获得较长的停留时间,在HRT20d时获得的污泥停留时间(SRT)超过130d,因此,获得比CSTR更高的处理效率.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/( m^3 · d). The biogas production volumes were 5 656 mL/d(A1 ), 6 335mL/d(A2) and 3 103 mL/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.
关 键 词:生物质废物 热水解 厌氧序批式反应器 厌氧消化 连续流完全混合反应器
分 类 号:X705[环境科学与工程—环境工程]
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