closed circulation of ash-sluicing water

例句：

1. 1. The closed circulation of ash-sluicing water has greatly reduced the amount of wastewater discharged into the environment.
   灰水循环利用大大减少了排放到环境中的废水量。
2. 2. This closed circulation system helps to reduce energy consumption and improve environmental protection.
   这个闭路循环系统有助于降低能源消耗，提高环境保护。
3. 3. In order to achieve closed circulation of ash-sluicing water, we need to invest in more efficient wastewater treatment facilities.
   为了实现灰水循环利用，我们需要投资建设更高效的废水处理设施。