产氢絮体和产甲烷絮体流变行为的研究VIP专享

产氢絮体和产甲烷絮体流变行为的讨论摘 要：本文讨论了产氢絮体和产甲烷絮体的流变行为并用不同的流变模型进行了模拟。实验结果表明: 产氢絮体和产甲烷絮体的表观剪切粘度都随着剪切速率的增大先减小，然后基本保持不变，维持在一个定值——无穷剪切粘度；产氢絮体和产甲烷絮体的无穷剪切粘度都随着污泥浓度的增加而增加，符合指数关系；而pH 值对产氢絮体和产甲烷絮体的无穷剪切粘度的影响不是很明显；温度升高, 产氢絮体和产甲烷絮体的无穷剪切粘度都相应会变小；Herschel-Bulkley模型可以较好的反映产氢絮体和产甲烷絮体的流变行为。关键词：流变；产氢絮体；产甲烷絮体；无穷剪切粘度Rheological properties of the hydrogen-producing flocs and the methane-producing flocsAbstractThe rheological characteristics of the hydrogen-producing flocs and the methane-producing flocs were investigated in this study. The influences of sludge concentration, temperature, and pH on the rheological properties of the flocs were evaluated, and three models were employed to describe their rheology. Both the hydrogen-producing sludge and the methane-producing showed shear-thinning behavior. The relationships between the limiting viscosity of the flocs with the solids content and the limiting viscosity with temperature could be respectively modeled by an exponential equation and Arrhenius equation very well. The limiting viscosity of the flocs seems not to be sensitive to changes of solution pH. Moreover, Herschel-Bulkley model was able to adequately describe the rheology of both the hydrogen-producing flocs and the methane-producing flocs.Key words: Flocs; Limiting viscosity Model; Rheological properties流变学是讨论物质在外力作用下流动与形变的科学。在污水处理的过程中，含生物介质的体系的非牛顿流体属性一方面影响着管道设计、搅拌、沉淀等实际操作过程，另外一方面影响着营养物质等的扩散或对流传质过程。目前对好氧污泥的流变行为已进行了深化的讨论。Battistoni[2]的讨论结果表明污泥的粘度变化范围达到4个数量级...