Integrated Mathematical Model for Nutrient Removal Wastewater Treatment Plant Including Sludge Treatment Train

在对现有污水处理厂进行营养盐处理的升级改造中，最具成本效益的解决方案之一是将其运行方式改为多个缺氧区的分步进水工艺。这项研究的目的是提供一种方法来设置升级后的装置的适当运行条件。对城市污水处理厂污泥回流至水处理回流中有机物的特性进行了现场研究。对分段进料多缺氧区工艺中缺氧区数目对脱氮效果的影响进行了模拟分析。建立了包括活性污泥2号模型在内的数学模型，用于模拟由常规工艺升级为不扩大反应器体积的大型污水处理厂的运行情况。模拟结果表明，缺氧区存在一个最佳数目，控制好氧区中的溶解氧浓度可以提高系统的脱氮效果。

In upgrading the existing waste water treatment plants to treat nutrients, one of the most cost-effective solution is to change their operation style to multi-anoxic zone process with step feeding. The objective of this study is to present a method to set the appropriate operating conditions of upgraded plants. Field study was performed to characterize the organic matters in return flow from sludge treatment train to water treatment train in municipal wastewater treatment plants. Simulation analysis was performed to study the effect of number of anoxic zones on nitrogen removal of a multi-anoxic zone process with step feeding. The mathematical model that included the Activated Sludge Model No.2 was developed for simulating the performance of the full-scale wastewater treatment plant upgraded from conventional process to without enlargement of reactor volume.We performed the lab-scale batch experiments with the multi-anoxic-aerobic phases with sewage step feed to verify our mathematical model. Simulated results showed that there is the optimum number of anoxic zones and that controlling the dissolved oxygen concentration in aerobic zones improve the nitrogen removal performance.