Electronic industry cleaning wastewater is biodegradable industrial wastewater difficult one, therefore, must be processed by other means.

电子工业清洗废水是较难生物降解的工业污水之一，因此，须采用其他方法对其进行处理。

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Cadmium is difficult to be biodegradable, accumulate in the soil for many centuries before being absorbed by plants, eventually the human food chain through ingestion.

镉难于被生物分解，在土壤中积聚数个世纪后才被植物吸收，最终被人类经过食物链摄取。

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