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首页> 外文期刊>Journal of Environmental Science and Health >Modelling of the temperature-phased batch anaerobic digestion of raw sludge from an urban wastewater treatment plant
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Modelling of the temperature-phased batch anaerobic digestion of raw sludge from an urban wastewater treatment plant

机译：城市污水处理厂原污泥的温度分批分批厌氧消化建模

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摘要

The disposal of excess sludge from wastewater treatment plants is a serious problem that needs to be addressed. Temperature-phased anaerobic digestion (TPAD) which combines thermophilic and mesophilic processes in one, brings together the advantages of both systems. The aim of the present work was to develop a simple kinetic model to describe the TPAD of sewage sludge in batch completely stirred tank reactors (CSTRs) and to determine the kinetic parameters of both thermophilic and mesophilic stages. A zero-order kinetic equation described the thermophilic step after 2, 4 and 6 days of digestion time (experiment 1, 2 and 3, respectively), yet a first-order equation was found to be adequate to correlate the methane gas accumulated with time in the mesophilic step, the kinetic constant being 0.21 days~(-1). The methane yield coefficient obtained was found to be almost proportional to the digestion time used in the thermophilic step with values of 0.067, 0.132 and 0.193 L CH4 STP/g VS_(sdded) for experiments 1, 2 and 3, respectively. By contrast, the kinetic constant of the mesophilic stage was not influenced by the digestion time used in the thermophilic phase.
机译：来自废水处理厂的剩余污泥的处置是一个严重的问题，需要解决。温度相结合的厌氧消化（TPAD）结合了嗜热和中温过程，将两种系统的优点结合在一起。本工作的目的是开发一个简单的动力学模型，以描述间歇式完全搅拌釜反应器（CSTR）中污水污泥的TPAD，并确定嗜热和中温阶段的动力学参数。零级动力学方程式描述了消化时间分别为2、4和6天后的嗜热步骤（分别为实验1、2和3），但发现一阶方程式足以将甲烷气体与时间相关联在中温步骤中，动力学常数为0.21天〜（-1）。发现获得的甲烷产率系数几乎与高温步骤中使用的消化时间成正比，分别用于实验1、2和3的值为0.067、0.132和0.193 L CH4 STP / g VS_（sddd）。相反，嗜温阶段的动力学常数不受嗜热阶段所用消化时间的影响。

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