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Rheological characterisation of concentrated domestic slurry
Water Research ( IF 11.4 ) Pub Date : 2018-05-03
A.K. Thota Radhakrishnan, J.B. van Lier, F.H.L.R. Clemens

The much over-looked element in new sanitation, the transport systems which bridge the source and treatment facilities, is the focus of this study. The knowledge of rheological properties of concentrated domestic slurry is essential for the design of the waste collection and transport systems. To investigate these properties, samples were collected from a pilot sanitation system in the Netherlands. Two types of slurries were examined: black water (consisting of human faecal waste, urine, and flushed water from vacuum toilets) and black water with ground kitchen waste. Rheograms of these slurries were obtained using a narrow gap rotating rheometer and modelled using a Herschel-Bulkley model. The effect of concentration on the slurry are described through the changes in the parameters of the Herschel-Bulkley model. A detailed method is proposed on estimating the parameters for the rheological models. For the black water, yield stress and consistency index follow an increasing power law with the concentration and the behaviour index follows a decreasing power law. The influence of temperature on the viscosity of the slurry is described using an Arrhenius type relation. The viscosity of black water decreases with temperature. As for the black water mixed with ground kitchen waste, it is found that the viscosity increases with concentration and decreases with temperature. The viscosity of black-water with ground kitchen waste is found to be higher than that of black water, which can be attributed to the presence of larger particles in the slurry.



中文翻译:

浓缩生活浆的流变学表征

本研究的重点是新型卫生设施中被忽视的要素,即连接来源和处理设施的运输系统。对浓缩的家用浆料的流变特性的了解对于废物收集和运输系统的设计至关重要。为了研究这些特性,从荷兰的一个试验性卫生系统中收集了样本。检查了两种类型的浆液:黑水(由人类粪便,尿液和真空马桶冲刷的水组成)和带地面厨余的黑水。使用窄间隙旋转流变仪获得这些浆料的流变图,并使用Herschel-Bulkley模型进行建模。浓度对浆料的影响通过Herschel-Bulkley模型参数的变化来描述。提出了一种估计流变模型参数的详细方法。对于黑水,屈服应力和稠度指数随浓度的增加而服从幂函数定律,而行为指数服从幂函数递减的规律。温度对浆料粘度的影响使用阿伦尼乌斯(Arrhenius)型关系描述。黑水的粘度随温度降低。对于掺有地面厨余的黑水,发现粘度随浓度增加而随温度降低。发现黑水与地面厨余垃圾的粘度高于黑水,这可以归因于浆料中存在较大的颗粒。屈服应力和一致性指数随浓度的增加而服从幂函数定律,而行为指数遵循幂函数的递减规律。温度对浆料粘度的影响使用阿伦尼乌斯(Arrhenius)型关系描述。黑水的粘度随温度降低。对于掺有地面厨余的黑水,发现粘度随浓度增加而随温度降低。发现黑水与地面厨余垃圾的粘度高于黑水,这可以归因于浆料中存在较大的颗粒。屈服应力和一致性指数随浓度的增加而服从幂函数定律,而行为指数遵循幂函数的递减规律。温度对浆料粘度的影响使用阿伦尼乌斯(Arrhenius)型关系描述。黑水的粘度随温度降低。对于掺有地面厨余的黑水,发现粘度随浓度增加而随温度降低。发现黑水与地面厨余垃圾的粘度高于黑水,这可以归因于浆料中存在较大的颗粒。黑水的粘度随温度降低。对于掺有地面厨余的黑水,发现粘度随浓度增加而随温度降低。发现黑水与地面厨余垃圾的粘度高于黑水,这可以归因于浆料中存在较大的颗粒。黑水的粘度随温度降低。对于掺有地面厨余的黑水,发现粘度随浓度增加而随温度降低。发现黑水与地面厨余垃圾的粘度高于黑水,这可以归因于浆料中存在较大的颗粒。

更新日期:2018-05-04
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