Biologicalnutrient removal is a relatively low-cost means of removing nitrogen and phosphorus from wastewater.
在对废水进行脱氮除磷时，去除生物营养素是一种相对成本较低的方法。
2
It is necessary to study the characteristics of microorganisms in the sludge in order to efficiently evaluate the biologicalnutrient removal (BNR) process.
为了有效地评价除磷脱氮工艺，有必要研究污泥中微生物的特性。
3
Third, control in time can performs the anaerobic, anoxic and aerobic conditions in a same compartment, and realizes or enhances biologicalnutrient removal.