Combination of thermal treatments and anaerobic digestion to reduce sewage sludge quantity and improve biogas yield
Combination of thermal treatments and anaerobic digestion to reduce sewage sludge quantity and improve biogas yield
复制标题
DOI：
10.1205/psep.05162
复制
发表时间：
2006-07-01
影响因子：
7.8
通讯作者：
Carrere, H.
中科院分区：
文献类型：
--
作者：
Bougrier, C.;Delgenes, J. -P.;Carrere, H.
厌氧消化是解决废水污泥管理问题的一个有趣的方法，因为一部分有机物被转化为甲烷，甲烷可作为可再生能源使用。本研究的目的是调查和比较不同城市污水处理厂收集的两个废弃活性污泥样品的热预处理对半连续厌氧消化的影响。在反应器稳定后，测定了化学需氧量、总固体和有机固体的去除速率以及甲烷产率。所有研究的热预处理(130摄氏度、pH=10、150摄氏度和170摄氏度在30分钟内)都比未经处理的污泥样品的厌氧消化性能有所提高。对于一种污泥，130℃、pH=10和170℃的处理导致相同的污泥溶解和相同的厌氧消化性能。但是，碱的投加对总固体的去除有负面影响。对于第二种污泥，170℃处理比150℃处理具有更高的增溶率和甲烷化性能。由于两个污泥样本非常相似，相同的170℃处理导致了类似的厌氧消化性能提高：物质去除和沼气产量提高了约80%。然而，大多数有机污泥的甲烷产率略高。
Anaerobic digestion is an interesting solution to wastewater sludge management issue as a part of organic matter is converted into methane which is valorisable as renewable energy. The aim of this study was to investigate and to compare the impact of sludge thermal pre-treatments on semi-continuous anaerobic digestion of two waste activated sludge samples collected from different urban wastewater plants. Chemical oxygen demand, total solids and organic solids removal rates and methane yields were determined after reactor stabilization.All the studied thermal pre-treatments (130 degrees C, pH = 10, 150 degrees C and 170 degrees C during 30 min) led to an enhancement of anaerobic digestion performance compared to untreated sludge samples. For one sludge, the 130 degrees C, pH = 10 and 170 degrees C treatments led to the same sludge solubilisation and the same anaerobic digestion performance. However, alkali addition had negative effect in total solid removal. For the second sludge, the 170 degrees C treatment led to higher solubilization rates and higher methanization performance than the 150 degrees C treatment. As both sludge samples were quite similar, the same 170 degrees C treatment led to comparable results in anaerobic digestion performance increase: about 80% improvement in removal of matter and in biogas yield. Nevertheless, values of methane yields were slightly higher for the most organic sludge.