School of Environment & Safety, Taiyuan University of Science & Technology, Taiyuan 030024, China E-mail:
Water Sci Technol. 2017 Apr;2017(1):229-237. doi: 10.2166/wst.2018.106.
In this paper, flow behavior for activated sludge and thermal treated sludge at different process temperature and various solids content were analyzed. Results show viscosity of activated sludge and thermal treated sludge both decreased with increasing temperature, while temperature dependence of viscosity for both types of sludge were not same at the whole study range. The relationship between viscosity and temperature could be expressed by Arrhenius equation for activated sludge, and it was interesting that this law was only suitable when certain solid content (80 g/L) for thermal treated sludge. Moreover, the logistic model was certified to be accurate in describing the functionality for thermal treated sludge. As solid content was at range of 80-100 g/L, active energy of viscosity for both kinds of sludge were similar, indicating that physicochemical properties' change of sludge after thermal hydrolysis had little effect on viscosity sensibility. Arrhenius law was also suitable for describing the relationship between storage modulus and process temperature for activated sludge. However, for thermal treated sludge, Arrhenius law was invalid. Yield stress for activated sludge was prominent, while it could be ignored for thermal treated sludge.
本文分析了不同工艺温度和不同固体含量下活性污泥和热解污泥的流动行为。结果表明，活性污泥和热解污泥的黏度均随温度升高而降低，但在整个研究范围内，两种污泥的黏度对温度的依赖性并不相同。活性污泥的黏度与温度之间的关系可以用阿仑尼乌斯方程来表示，有趣的是，这一规律仅适用于热解污泥的特定固体含量（80g/L）。此外，逻辑模型被证明可以准确描述热解污泥的功能。当固体含量在 80-100g/L 范围内时，两种污泥的黏度活化能相似，表明热解水解后污泥理化性质的变化对黏度敏感性影响不大。阿仑尼乌斯定律也适用于描述活性污泥的储能模量与工艺温度之间的关系。然而，对于热解污泥，阿仑尼乌斯定律是无效的。活性污泥的屈服应力很明显，而热解污泥的屈服应力可以忽略不计。
