Effects of Microwave Pretreatment of Dewatered Sludge from an Oxidation-Ditch Process on the Biogas Yield in Mesophilic Anaerobic Digestion
Effects of Microwave Pretreatment of Dewatered Sludge from an Oxidation-Ditch Process on the Biogas Yield in Mesophilic Anaerobic Digestion
复制标题
DOI：
10.2965/jwet.15-048
复制
发表时间：
2016
影响因子：
--
通讯作者：
Taketo Togari;R. Yamamoto-Ikemoto;H. Ono;Kengo Takashima;R. Honda;Kojiro Tanaka
中科院分区：
文献类型：
--
作者：
Taketo Togari;R. Yamamoto-Ikemoto;H. Ono;Kengo Takashima;R. Honda;Kojiro Tanaka
采用微波预处理氧化沟工艺产生的高浓度脱水污泥（OD污泥），以提高其在中温厌氧消化中的降解和产气量。在间歇式沼气发酵试验中，微波辐照后OD污泥的产气潜力有所提高。沼气潜力的增加取决于照射时间和温度。在中温条件下，使用实验室规模的消化器在25天的水力停留时间（HRT）下进行预处理的OD污泥的连续消化。尽管对照消化器中的生物气产率为0.12 NL/g-总固体（TS），但用在80°C下用最大100 W照射60分钟预处理的OD污泥进料的生物气产率为0.15 NL/g-TS。采用新型连续微波辐射装置，在400 W微波辐射20 min的条件下，对脱水后的OD污泥进行预处理，并与6种废弃生物质进行中试共消化。反应器的沼气产率从0.25 NL/g-TS增加到0.28 NL/g-TS。假设每种共消化生物质的沼气产量恒定，OD污泥的沼气产量估计增加42%。
Microwave pretreatment was applied to highly concentrated dewatered sludge produced from an oxidation ditch process (OD sludge) to improve its degradation and biogas production in mesophilic anaerobic digestion. In a batch experiment using methane fermentation, the biogas production potential of OD sludge was increased after microwave irradiation. The increase in the biogas potential depended on the irradiation period and the temperature. Continuous digestion of the pretreated OD sludge was carried out in mesophilic conditions using a laboratory-scale digester at 25 days of hydraulic retention time (HRT). Although the biogas yield in the control digester was 0.12 NL/g-total solids (TS), that fed with OD sludge pretreated with max 100 W of irradiation at 80°C for 60 min was 0.15 NL/g-TS. Subsequently, dewatered OD sludge was pretreated by a novel continuous microwave irradiation device at 400 W for 20 min and fed into a pilot-scale co-digester with six kinds of waste biomass. The biogas yield of the reactor was increased from 0.25 NL/g-TS to 0.28 NL/g-TS. Assuming that the biogas yield of each co-digesting biomass was constant, the biogas yield of the OD sludge was estimated to increase by 42%.