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美国正遭受50年来最严重的旱灾,这使得水资源的保护,包括污水的处理回用问题被提到极端重要的位置上。按照联邦和各州对污水进行二级和更高级处理要求,净化后的回收水被引入双套洪水系统,用于厕所的冲洗、工业和商业设施的冷却用水以及地下水的人工补给。 1985年亚利桑那大学设计并改进了双套供水系统,该系统除利用来自厨房、洗衣间、洗澡间的生活污水外,还利用雨水。这种水用来冲洗厕所和浇灌园艺作物。冲洗厕所的水排至下水道。一年以后,这种水代替了厕所冲洗水的25%。一般说,城市工业用水量约占城市总用水量的80%,而工业用水中水质要求不
The United States is experiencing the worst drought in 50 years, making the protection of water resources, including wastewater treatment and reuse, an extremely important issue. In accordance with federal and state requirements for secondary and higher treatment of wastewater, the purified recovered water is introduced into a dual flood system for toilet flushing, cooling water for industrial and commercial facilities, and artificial recharge of groundwater. In 1985, the University of Arizona designed and improved a two-unit watering system that utilizes rainwater in addition to domestic wastewater from the kitchen, laundry room and bathroom. This water is used to flush toilets and watering gardening crops. Flush toilet water drain to sewer. A year later, this water replaced 25% of toilet flushing water. In general, urban industrial water consumption accounts for about 80% of the total urban water use, while industrial water quality requirements are not