但废水中难降解物质焦糖去除率较小。

But it was difficult to remove caramel from the wastewater.

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但是当用生物可降解物质替代这些中性辅料时会发生什么呢？

But what would happen if biodegradable materials were used instead of these neutral excipients?

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皮革废水难降解物质含量高，且含有大量的悬浮物质，对环境污染很大。

The tannery wastewater contains difficult degradation substances with high strength and large number of suspended substances, seriously polluting the environment.

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