2007年，印第安纳州的一家精炼厂获准向密歇根湖排入更多废水。
In 2007 a refinery in Indiana received a permit to increase discharges into Lake Michigan.
针对油脂精炼厂在精炼过程中产生的有机废水的特点，采用了活性污泥法的处理工艺。
The active sludge method was used to treat the wastewater by analyzing the characteristics of organic wastewater produced through refining process in oil plant.
针对油脂精炼厂在精炼过程中产生的有机废水的特点，采用了活性污泥法的处理工艺。
The active sludge method was used to treat the wastewater by analyzing the characteristics of organic wastewater produced through refining process in oil plant.
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