中文摘要：

通过在二沉池一维分层模型中加入弥散作用建立了二沉池一维分层弥散模型，并采用数值求解的方法开发了二沉池模拟程序。利用竖流式沉淀池中试试验实测数据验证了模型的可靠性，以COST（欧洲科技领域研究合作组织）624/682文件中基准污水处理厂沉池晴天时的稳态和动态进水数据为模型输入值，分析比较了一维分层弥散模型模拟程序与国外成熟软件的模拟结果。结果表明，纳入了弥散作用的一维分层模型能较好地描述实际二沉池中的悬浮固体浓度分布，模拟结果具有较好的精度，有待于在二沉池模拟和控制领域进一步深入研究。

英文摘要：

By incorporating dispersive effect in the ideal 1D layered model of secondary settling tank, a 1D layered and dispersive model of secondary settling tank was established and numerically solved to develop a corresponding simulation program for secondary settling tank. The reliability of the model was validated by practical data collected from pilot-scale vertical-flow settling tank test, and by simulation results comparison with recommended foreign programs and softwares in the COST 624/682 simulation benchmark based on data collected from secondary settling tank in benchmark wastewater treatment plant under dry weather. Stable and dynamic simulation results showed that this model can correctly simulate suspended solids concentration profiles in practical secondary settling tank, and the model can reach the same simulation precision as recommended foreign programs or softwares in COST simulation benchmark. The 1D layered and dispersive model might be provided as a new tool for further studies on simulation and control of secondary settling tank.