某制浆造纸厂污水处理原采用二级生化处理工艺。
The effluent disposal system in certain pulp and paper mills was a two-stage biochemical treatment process.
概述了制革废水一级物化处理和二级生化处理的各种方法。
The methods of chemical and physical treatment and biological treatment on tannery waste water are summarized.
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。
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.
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