河流被来自工厂的废水污染了。
许多河流被工业废水污染了。
最后，简要介绍了排放废水污染的控制与恢复。
Finally the control and recovery for the discharge of waste water pollution is introduced.
低温合成工艺还可以节约能源，避免废水污染。
Low temperature synthetic process can also reduce energy consumption and avoid waste water pollution.
经济有效地控制氨氮废水污染是当前面临的重大课题。
Economical and effective control of pollution by ammonia-nitrogen waste water is a vital problem currently.
如何有效地去除废水中的氨氮是水污染防治界研究的重点和难点之一。
How to achieve high removal rate of ammonium is the emphasis to researchers.
如何有效地去除废水中的氨氮是水污染防治界研究的重点和难点之一。
How to achieve high removal rate of ammonium is the emphasis to researchers.
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