粉炭强化循环造粒流化床去除天然有机物的研究

强化天然有机物去除是饮用水处理工艺的重要目标.循环造粒流化床作为一种新型高效固液分离技术具有处理负荷高、水质适应性强的特点，将其与粉末活性炭（PAC）联用，探究对水库水中有机物的强化去除效果.研究发现当聚合氯化铝（PACl）与PAC同时投加，且PACl、聚丙烯酰胺（PAM）及PAC投加量分别为24mg/L、1.2mg/L、30mg/L时，流化床系统对进水浊度、UV₂₅₄、COD_Mn、DOC去除率分别为96.5%、72.0%、71.7%、61.0%.对进出水中的有机物进行三维荧光分析，发现流化床系统中结团造粒作用下出水的类富里酸和类腐殖酸的FI分别比进水降低了40.1%和43.0%；加入30mg/L PAC后，出水的类富里酸和类腐殖酸的的FI分别比原水降低了54.0%和55.3%.水库水中的有机物分子量主要在 < 1kDa和10~30kDa两个区间，分别占总有机物含量的37.1%和39.1%.循环造粒流化床系统中结团造粒作用主要去除10~30kDa区间的有机物，PAC吸附作用对 < 1kDa的有机物有很好的去除.

Research on the removal of natural organic matters using a circulating granulation fluidized bed strengthened by powdered activated carbon

The strengthened removal of natural organic matters was an important object for the technology of drink water treatment. The circulating granulation fluidized bed, as a new type, but effective technology for separating solids from liquids, was the characteristic of a high load of treatment and a strong adaptability to different water qualities. Combining this fresh technology with powdered activated carbon (PAC), the strengthened removal effect of organic matters in the water of reservoirs was studied. It was discovered that when the PACl and PAC were using together, and when the dosages of PACl, PAM and PAC were 24mg/L, 1.2mg/L and 30mg/L, the removal rates of the turbidity, UV₂₅₄, COD_Mn and DOC of water input in the fluidized bed system were 96.5%, 72.0%, 71.7% and 61.0% respectively. Through the three-dimensional fluorescence analysis of organic matters during the water inflow and outflow, it was noticed that, in this fluidizedbed system and under the effect of coagulation and granulation, the FI of fulvic acid and humic acid during water outflow were lowered by 40.1% and 43.0% as against the water inflow, after PAC was put in of 30mg/L, the FI of fulvic acid and humic acid during water outflow were lowered by 54.0% and 55.3% as against the water inflow. The molecular weight of the organic matters in the water of reservoirs lay chiefly between < 1kDa and 10~30kDa, accounting for 37.1% and 39.1% of the total weight of organic matters respectively. In the circulating granulation fluidized bed system, the effect of coagulation and granulation was intended to remove the organic matters in range of 10~30kDa, and the organic matters of < 1kDa could be removed comparatively better due to the adsorption by adding PAC.