好氧污泥絮体与厌氧颗粒污泥的剪切稳定性分析.pdfVIP

中国环境科学 2009,29(4) ：380~385 China Environmental Science 好氧污泥絮体与厌氧颗粒污泥的剪切稳定性分析 * 王毅力 ,黄承贵 (北京林业大学环境科学与工程学院,省部共建森林培育与保护教育部重点实验室,北京 100083) 摘要：通过标准的剪切实验装置检测了好氧污泥絮体和厌氧颗粒污泥在不同剪切条件下剥离的分散胶体浓度的变化.结果表明,厌氧颗粒污泥 的剪切敏感性(KSS) 比好氧活性污泥高1 个数量级,证明了好氧活性污泥的剪切稳定性更好.好氧活性污泥絮体在剪切下剥离的分散胶体平衡浓 度(m )分别随着污泥悬浊液的固体浓度(m )和剪切强度(G) 的增加而增加.AE 模型的模拟结果显示,好氧活性污泥絮体样品1 在剪切作用下粘 d,∞ T 附-剥离的平衡常数(Km) 比样品2 的高,相应的ΔG0adh/RT 值更小,证明其在剪切作用下的粘附过程更易发生.修正AE 模型可以更好地模拟不同 剪切强度下污泥絮体上分散胶体的剥离过程,其不仅能够给出未施加剪切的稳定状态时因布朗运动而导致的分散胶体浓度,而且能确定与污泥 絮体上分散胶体的剥离能量相关的ΔH/R 值.模拟结果表明,好氧活性污泥絮体样品 1 上分散胶体的剥离需要更多的能量,剪切强度的升高对样 品2 的影响更加明显.活性污泥剪切稳定性的差异证明了其与污泥结构、性质以及污水处理厂运行效果之间的关系比较复杂. 关键词：好氧污泥絮体；厌氧颗粒污泥；剪切稳定性；剪切敏感性；布朗运动 中图分类号：X703.5 文献标识码：A 文章编号：1000-6923(2009)04-0380-06 * Analysis of the shear stability of aerobic sludge flocs and anaerobic sludge granules. WANG Yi-li , HUANG Cheng-gui (The Key Laboratory for Silviculture and Conservation of Ministry of Education, College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China). China Environmental Science, 2009,29(4)： 380~385 Abstract ：The shear stability of some aerobic activated sludges and anaerobic sludge with determining the mass concentration changes of dispersed colloids eroded from some aerobic activated sludge flocs and anaerobic sludge granules were examined with standard shear test devices. Aerobic activated sludge in A2/O process possessed better shear stability, and the shear sensitivity (KSS) of their flocs was an order of magnitude less than the anaerobic sludge granules of ABR. Both the increase of total solid concentration (mT) of activated sludge and the increase of shear intensity (G) could result in increment in the dispersed mass concent