Nitrogen and phosphorus removal is important in water pollution control.
城市污水中氮、磷的处理是水污染控制的一个重要问题。
Economical and effective control of pollution by ammonia-nitrogen waste water is a vital problem currently.
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.
经济有效地控制氨氮废水污染是当前面临的重大课题。
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