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生产实践中,经常需要把一些生产单元用管线联结起来,比如:一个工厂内有几个车间,车间有必须处理的污水外排,这些外排的污水集中输送到污水处理站处理。这个中心处理站的站址如何选定;在某种意义上,也就是这些联结管网怎样配置才能经济合理;处理站处理净化的水,一部分循环使用,一部分很可能还要排入河流湖泊甚至水库,这些外排的管线又应如何配置才经济合理;或者几个工厂,把外排的污水集中到一
In the production practice, it is often necessary to connect some production units by pipelines. For example, there are several workshops in a factory, and the workshops have effluent discharges that must be treated. These effluent discharges are sent to the sewage treatment station for disposal. How the site of this central processing station is selected; in a sense, how can these connection networks be configured to be economically reasonable; the treatment station processes purified water, some of which are recycled, and some of which are likely to be discharged into rivers and lakes The reservoirs, how to configure these effluent pipelines should be economically reasonable; or several factories should concentrate the effluent discharged into the