本文描述了康特拉科斯塔水区（CCWD）75 mgd Bollman水处理厂污水流量计的安装和运行。它为过滤后的化学物质提供精确的流动速度。新DCS系统的一个好处是，它将使所有工厂化学品都能按流动速度流动，但许多化学品，即次氯酸钠、氨、苛性钠和氢氟硅酸，都是在过滤器后进料的。工厂进水文丘里管适用于在前端进料的流速调节化学品，如凝固剂和预氧化剂- 工厂的尽头。工厂废水流量计的安装被认为是至关重要的，尤其是对于次氯酸钠和氨等消毒化学品的精确控制。

This paper describes the installation and operation of a plant effluent flow meter at the Contra Costa Water District's (CCWD) 75 mgd Bollman Water Treatment Plant. It provides accurate flow-pacing of the post-filtration chemicals. One of the benefits of the new DCS system was that it would enable all the plant chemicals to be flow-paced, but many of the chemicals, i.e. sodium hypochlorite, ammonia, caustic soda and hydrofluosilicic acid, are fed after the filters. The plant influent venturi is appropriate for flow-pacing chemicals, such as coagulants and pre-oxidant, that are fed at the front-end of the plant. The installation of a plant effluent flow meter was considered to be essential, particularly for accurate control of disinfection chemicals, such as sodium hypochlorite and ammonia.