本帖最后由 三T上人 于 2016-7-22 19:14 编辑 <br /><br />来点英文资料
The sludge is then pumped into the Sludge Lagoon. This sludge lagoon has two winter cells, six summer cells and two separated liquid cells. The digested sludge settles and thickens. The surface liquid is returned to the plant for treatment. The thickened sludge is finally taken away and used as fertilizer. This recycles a valuable resource is much more economical than disposing of the sludge in land fills or burning it.