Because the intension of flocculent mass is loose after daily sewage disposed by biodegradation technique,it has good effect for double filtering layers that is made up of quartz sand and water slag.

• 电厂生活污水用生物法处理后,由于水中的悬浮物疏松,采用石英砂和水淬渣组成的双层滤料过滤更适合。