One sewer receives domestic sewage, trade effluent and rainwater from roofs only and the other all remaining rainwater.
一条排放生活污水、业废水和屋顶的雨水，另一条排放除此之外的其它雨水。
3
In this article, an application of the method of shooting flow aeration activated sludge in treating the sewage of foreign trade refrigeration factory is introduced.