摘要：

初步研究了臭氧、单独投加氯化铁、先臭氧曝气后投加氯化铁、先投加氯化铁后臭氧曝气对活性污泥的影响,分析了臭氧作用时间、FeCl₃浓度及氯化铁/臭氧组合次序对活性污泥性质的影响。研究表明:随着臭氧作用时间的延长,污泥的悬浮固体(TS)、挥发性悬浮固体(VTS)及VTS/TS均逐渐减小,污泥比阻先略微上升后逐渐下降,污泥上清液中的COD增加明显。单独投加氯化铁后,污泥比阻和污泥上清液中的COD均逐渐降低。氯化铁/臭氧组合工艺对污泥的作用效果不同,污泥的TS由低到高的排列顺序为FeCl₃/O₃ >O₃ >O₃/FeCl₃ >FeCl₃;污泥上清液中COD由高到低的排列顺序为O₃ >O₃/FeCl₃ >FeCl₃/O₃ >FeCl₃;污泥比阻由低到高的排列顺序为FeCl₃/O₃ >O₃/FeCl₃ >FeCl₃ >O₃。实验结果表明,FeCl₃/O₃法在污泥减量化及改善污泥脱水性能方面优于其他方法。

关键词: 臭氧, 氯化铁, 活性污泥

Abstract:

The influences of O₃,adding FeCl₃ singly,O₃ aeration first followed with adding FeCl₃,and adding FeCl₃ first followed with O₃ aeration have been studied preliminarily. The influences of O₃ reaction time,FeCl₃ concentra-tion and combination order of FeCl₃/O₃ on the activated sludge characteristics have been analyzed. The results show that with the prolonging of O₃ reaction time,the suspended solids(TS), volatile suspended solids(VTS) and VTS/ TS are gradually reduced,the sludge specific resistance is increased slightly first,and then declined slowly,but the COD in supernatant is increased significantly. After adding FeCl₃ singly,the sludge specific resistance and the COD in sludge supernatant are both decreased gradually. The reaction effect of FeCl₃/O₃ combined process on sludge is different. The permutation order of the TS of sludge from low to high is FeCl₃/O₃ >O₃ >O₃/FeCl₃ >FeCl₃. The permulation order of the COD in sludge supernatant from high to low is O₃ >O₃/FeCl₃ >FeCl₃/O₃ >FeCl₃. And the permutation order of the sludge specific resistance from low to high is FeCl₃/O₃ >O₃/FeCl₃ >FeCl₃ >O₃. The results show that the FeCl₃/O₃ method is superior to the other three methods in the aspects of sludge minimizing and sludge dewatering improvement.

Key words: ozone, ferric chloride, activated sludge

中图分类号: 

• X703