Treating combined sewage effluent from a secondary treatment plant, the process achieved 94.5% cadmium removal for the trace quantities present .
用这种方法处理二级处理厂排出的综合下水，可除去水中含镉量的94.5。
Therefore, the study was made on the use of subsurface crushed stone wetland for phosphorus removal from the effluent of secondary bio-chemical treatment process.
为此，开展了潜流碎石床湿地去除二级生化处理出水中磷的研究。
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