投加颗粒活性炭促进好氧颗粒化进程研究

Promotion of aerobic granulation process by addition of particle activated carbon

为实现快速好氧颗粒化,通过在接种污泥中投加颗粒活性炭并逐步缩短沉降时间的选择压法培养AGS,研究投加颗粒活性炭对好氧颗粒化进程的影响,为AGS技术的工程化应用提供技术支持.结果表明颗粒活性炭通过带动污泥的沉降、充当载体等机制从而有利于AGS的快速形成,到21天时几乎全部以菌胶团及好氧颗粒污泥形式存在.前11天内将每次排出的颗粒活性炭重新接回反应器,第12天开始将排出的活性炭收集、洗浄、干燥后备用(最终回收率约57.3%),达到了资源重复利用及回收目的.虽然培养过程中污泥理化特性及对污染物的去除率均有波动,但污泥形态逐渐趋于致密,且对COD、TIN及TP去除率均逐渐上升至90%以上,表现出较好的沉降性能及代谢活性.

In order to accelerate the process of aerobic granulation, the addition of particle activated carbon（PAC） and the selection pressure method of gradually reducing the settling time were employed to the cultivation of aerobic granular sludge（AGS）. The effect of PAC addition on aerobic granulation process was explored, which devoted to provide technical support for application of AGS technology. The results indicated that the mechanism of rapid formation of AGS including sludge settling velocity was promoted by PAC and PAC played as the carriers for sludge. Thus, the reactor was mainly consisted of zooglea and AGS on the 21 st day. The PAC in effluent was sent back to the reactor after each discharge process during the former 11 days,while it was collected, washed, dried and reserved（final recovery rate was about 57.3 %） to achieve the resource reuse and recycling purpose from the 12 th day. Although physicochemical properties of AGS and its performance to pollutants removal both fluctuated during cultivation, the sludge gradually tended to be denser,and the COD, TIN, and TP removal rates gradually rose to more than 90 %, which indicated that AGS had good settling performance and metabolic activity.