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Effect of SRT and digester staging on the anaerobic digestion of municipal sludge
Clean Technologies and Environmental Policy ( IF 4.3 ) Pub Date : 2020-10-09 , DOI: 10.1007/s10098-020-01956-2
Jesus A. Cacho Rivero , Makram T. Suidan

The effect of solids retention time (SRT) on the mesophilic anaerobic digestion of a mixture of primary and waste activate sludge (WAS) was investigated. Twelve laboratory-scale (8 L) digesters were operated in triplicate at four different SRTs (5, 10, 20 and 40 days). The performance of the digesters was evaluated through measuring gas production and composition, total and volatile suspended solids (TSS & VSS) and other effluent quality parameters. VSS removal ranged between 37.6 and 53.6%. The rate of solids disintegration was modeled as a first-order decay reaction taking place in a plug-flow reactor with recycle. The calculated biodegradable fraction of the VSS and the first-order reaction rate constant were 55.3% and 0.38 d−1, respectively. During the second phase of the study, a comparison between multistage digesters in series versus a single-stage digester of equivalent total SRT was performed. Staging was found to always affect greater VSS destruction than single-stage operation. A mathematical model describing VSS destruction in a multistage reactor was developed.

Graphic abstract



中文翻译:

SRT和消化池分期对城市污泥厌氧消化的影响

研究了固体保留时间(SRT)对主要和废物活性污泥(WAS)混合物的中温厌氧消化的影响。在四个不同的SRT(5、10、20和40天),一式三份地操作了十二个实验室规模的(8 L)消化池。通过测量气体产生量和组成,总悬浮物和挥发性悬浮固体(TSS和VSS)以及其他废水质量参数来评估蒸煮器的性能。VSS去除率介于37.6和53.6%之间。固体崩解速率被建模为在具有循环的活塞流反应器中发生的一级衰减反应。计算出的VSS的可生物降解分数和一级反应速率常数为55.3%和0.38 d -1, 分别。在研究的第二阶段,对串联多级消化池与等效总SRT的单级消化池进行了比较。发现分阶段总是比单阶段操作影响更大的VSS破坏。建立了描述多级反应器中VSS破坏的数学模型。

图形摘要

更新日期:2020-10-11
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