Park B, Ahn J H, Kim J, Hwang S
School of Environmental Science and Engineering, Pohang University of Science and Technology, San 31, Hyoja-dong, Nam-gu, Pohang, Kyungbuk 790-784, South Korea.
Water Sci Technol. 2004;50(9):17-23.
This work elucidates the effects of pretreatment of secondary sludge by microwave irradiation on anaerobic digestion. The soluble chemical oxygen demand (COD) concentration increased up to 22% as microwave irradiation time increased, which indicated the sludge particles disintegrated. Three identical automated bioreactors with working volume of 5 l were used as anaerobic digesters at mesophilic temperature (35 degrees C). The reactors were separately fed with sludge with microwave pretreated- and control- sludge at different hydraulic retention times (HRT). The volatile solid (VS) reduction in the control operation was approximately 23.2 +/- 1.3%, while it was 25.7 +/- 0.8% for the reactors with the pretreated sludge. The average biogas production rate with the pretreated sludge at 8, 10, 12, and 15 days HRTs was 240 +/- 11, 183 +/- 9, 147 +/- 8, and 117 +/- 7 ml/l/d respectively, while those with the control sludge were 134 +/- 12 and 94 +/- 7 ml/l/d at 10 and 15 days HRTs. Maximum rates of COD removal and methane production with the pretreated sludge were 64% and 79% higher than those of the control system, respectively.
这项工作阐明了通过微波辐射预处理二次污泥对厌氧消化的影响。随着微波辐射时间的增加，可溶性化学需氧量（COD）浓度增加了22%，这表明污泥颗粒发生了分解。三个工作体积为5升的相同自动生物反应器被用作中温（35摄氏度）的厌氧消化器。在不同的水力停留时间（HRT）下，分别向反应器中加入经过微波预处理的污泥和对照污泥。对照操作中挥发性固体（VS）的减少量约为23.2±1.3%，而使用预处理污泥的反应器中该减少量为25.7±0.8%。在水力停留时间为8、10、12和15天时，使用预处理污泥的平均沼气生产率分别为240±11、183±9、147±8和117±7毫升/升/天，而使用对照污泥时，在水力停留时间为10和15天时，沼气生产率分别为134±12和94±7毫升/升/天。使用预处理污泥时，COD去除率和甲烷产量的最大速率分别比对照系统高64%和79%。
