铁盐对好氧污泥颗粒化进程的强化作用

Enhancing effect of iron salts on granulation process of aerobic sludge

采用在絮状好氧污泥中短期投加聚合氯化铁(PFC)的方式来加速污泥的颗粒化进程,考察了期间颗粒污泥的形态特征和对主要污染物的去除效果。投加PFC后,反应器内的污泥在第35天实现了完全颗粒化,比对照组提前了10 d,并拥有更高的污泥浓度和更好的沉降性能。在颗粒完全成熟后,加药组对COD、NH_4^+-N的平均去除率分别达到97.8%、76.5%,分别比对照组高出3.3%、5.5%,说明铁盐对好氧污泥的颗粒化进程具有明显强化作用。

A method of short-term addition of Polymerization of Ferric Chloride（PFC） to flocculent aerobic sludge has been used for accelerating the sludge granulation process,and the morphological characteristics of granular sludge in the course,and its removing effect on main pollutants have been investigated. After adding PFC,it is found that the sludge in the reactor can realize complete granulation in 35 days,which is 10 days ahead of the days in control group,and has higher concentration and better settling capability. When the granular sludge is fully mature,the average removing rates of COD and NH4~＋-N are 97.8% and 76.5%,respectively,which are 3.3% and 5.5% higher than those in the control group,respectively. It indicates that iron salts have obvious enhancing effect on the granulation process of aerobic sludge.