As a chemical it's also used in insecticides, water purification, sewage treatment and the production of ammonia.

作为一种化学原料，它也被用于制造杀虫剂、提纯水、净化污水和制氨。

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The Fairfield Sewage Treatment Plant produces around 4.3b litres of treated water every year.

据澳大利亚媒体近日报道，费尔菲尔德污水处理厂每年生产43亿升再生水。

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Spray irrigation sprinkling water over land to be used for crops. often used to dispose of wastewater from sewage treatment plants.

喷洒灌溉，喷灌把水喷洒于准备种植作物的土地上。常常使用经过污水厂处理过的废水。

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Separating our water supply from sewage and learning how to do wastewater treatment was a really important part of reducing infectious diseases.

把净水和污水分开,以及学会污水处理的方法,是减少感染性疾病传播方法中的重要部分

耶鲁公开课 - 生物医学工程探索课程节选

He cites lack of water treatment, sewage and planning, and says the film-makers will likely leave the island in better condition than before they arrived.

CNN: POSTCARDS FROM THE BEACH

But as Brazil grows--and in fact, as Latin America grows--fundamental features underlying all of the growth include good, clean water as well as sewage-treatment capability, which is also one of this company's other related activities.

FORBES: Magazine Article

By 2015, the government intends to add 42 million tons of daily sewage treatment capacity to increase its urban waste water treatment rate to 85 percent.

FORBES: Quenching China's Thirst For Water