迈克尔逊废水回收厂（MWRP）处理工艺包括三级过滤步骤。MWRP使用七个双介质重力过滤器，组合流量平均为13 MGD。从历史上看，过滤器经常出现排水不足的问题，导致三级出水中的介质损失和大肠菌群计数升高。未检测到的过滤介质损失会导致更换过滤介质的成本增加，并增加消毒和pH值控制设施的化学品消耗。过去，MWRP试图使用单独的过滤器浊度计来缓解这个问题。然而，由于灵敏度阈值较低，浊度计被发现无效。 2000年4月至5月，MWRP对Chemtrac（R）PC2400D在线颗粒计数器进行了一项示范研究，以监测单个滤池的出水颗粒分布。根据这项研究的结果，MWRP为所有七个三级过滤器配备了这种在线粒子计数器模型（2001年）。粒子计数器被证明是监测单个滤池完整性的有效工具。MWRP将专有的Chemtrac（R）颗粒计数器动态数据交换（DDE）软件与现有的基于Wonderware的SCADA系统连接起来，以增强监控过程，并制定了大量介质丢失的警告指南。 包括表格、图表和附录。

Michelson Wastewater Reclamation Plant (MWRP) treatment process includes a tertiary filtration step. MWRP utilizes seven dual media gravity filters with combined flow rates averaging 13 MGD. Historically, the filters often developed underdrain problems leading to media loss and elevated coliform counts in the tertiary effluent. Undetected filter media loss leads to increased costs in filter media replacement and increased chemical consumption at the disinfection and pH control facilities. In the past, MWRP tried to use individual filter turbidimeters to alleviate this problem. However, the turbidimeters were found ineffective due to their low sensitivity threshold. In April-May of 2000, MWRP performed a demonstration study of the Chemtrac(R) PC2400D online particle counter to monitor individual filter cells effluent particle distribution. Based on the results of this study, MWRP equipped all seven tertiary filters with this online particle counter model (2001). The particle counters proved to be an effective tool in monitoring individual filter cell integrity. MWRP linked the proprietary Chemtrac(R) particle counters Dynamic Data Exchange (DDE) software with the existing Wonderware based SCADA system to enhance the monitoring process, and developed the guidelines for warning of the onset of extensive media loss. Includes tables, figures, appendices.