Water purification systems may follow the initial pretreatment steps in various sequences depending on the characteristics of the water and the design of the system.

水纯化系统可能跟随在初始的预处理步骤后面，根据水规格参数的不同有多种顺序和系统设计。

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Biological pretreatment technology is an economic and efficient method to remove ammonia - nitrogen in micro - polluted raw water.

生物预处理是去除微污染源水中氨氮的一种经济有效的方法。

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Some physical process of boiler water pretreatment have been summed up.

着重就锅炉用水预处理的物理方法进行了综述。

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They included disruption to operations from drought or flooding, declining water quality that required costly on-site pretreatment, increases in water prices, and fines and litigation relating to pollution incidents.

FORBES: A New Tool To Manage Companies' Growing Water Risks