How to treat sludge from sewage treatment plant is a big difficult problem faced by big or middling cities.

如何处置污水处理厂产出的污泥是世界各大、中城市面临的一大难题。

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How to treat sludge from sewage treatment plant is a big difficult problem faced by big or middling cities.

如何处置污水处理厂产出的污泥是世界各大、中城市面临的一大难题。

youdao