Then it began to act like yeast used in slow-fermenting lagers, settling to the bottom of the tank but not going dormant.
然后它们开始像用于慢性发酵的储藏啤酒的酵母一样活动，深入酿造箱底部，却又不休眠。
2
An activated sludge system consists of an equalization basin, a settlingtank, an aeration basin, a clarifier, and a sludge recycle line.
一个活性污泥系统包括一个均衡盆地，一个沉淀池，曝气盆地的，一个澄清和污泥回收线。
3
Sewage sludge which mainly comes from the primary settlingtank and discharge of surplus sludge is the deposit produced in each operating unit in municipal wastewater treatment plant.