魁北克省蒙特利尔市正在考虑在不久的将来改造阿特沃特水处理厂。该市一直积极参与确定和定义最具成本效益的处理方案的设计标准，以实现水质目标。在之前的一项研究中，拒绝使用臭氧氧化，直接双介质生物活性过滤被确定为工厂升级最有希望的处理工艺。本文描述了在达到其他水质目标的同时，优化过滤器性能以去除浊度、颗粒物和好氧芽孢细菌的试验结果。该研究的目的是在现有设施的限制范围内，通过修改过滤介质和添加混凝来提高过滤器性能。

The City of Montreal, Quebec, is considering retrofitting its Atwater water treatment plant in the near future. The City has been actively involved in an effort to identify and define the design criteria of the most cost-effective treatment scenario to meet water quality goals. In a previous study, the use of ozonation was rejected and direct dual media biologically active filtration was identified as the most promising treatment process for the plant upgrade. This paper describes the results of testing undertaken to optimize filter performance for the removal of turbidity, particles and aerobic spore-forming bacteria, while meeting other water quality goals. The objectives of the study were to increase filter performance by modifying filter media and adding coagulation within the constraints of the existing facilities.