Some hypothetical vertical farms have even been designed to recycle processed sewage (PDF), turning waste into water that meets drinkingwaterstandards.
据假想设计，一些纵向农场具有循环处理污水的机制，经过处理的废水可以达到饮用水的标准。
2
With the deterioration of water environmental pollution and the more stringent drinkingwaterstandards, conventional water treatment technology appeared its lack in efficiency.
随着水环境污染的加剧和饮用水水质标准的提高，传统水处理工艺在效能方面渐显不足。
3
Every year, Americans produce 12 trillion gallons of wet sewage and burn 21 billion kilowatt-hours of electricity to clean it to drinking-waterstandards.