利用分子量分布探讨粉末活性炭对膜生物反应器的影响

Influence of PAC on MBR through molecular weight distribution measurement

采用空间排阻液相色谱法监测了不同粉末活性炭(PAC)投加量下膜生物反应器混合液分子量分布情况,发现当PAC投加量从1g·L-1增加到2g·L-1时,混合液中分子量大于10×103的物质会增加;分子量小于0.5×103及介于3×103～10×103的物质含量相当;分子量介于0.5×103～3×103的物质显著减少。膜污染速率分别为2.74、3.10kPa·m-1,证实了混合液中分子量大于10×103的有机物是引起膜污染的主要物质。

Molecular weight distribution of the mixed liquor in membrane bioreactor （MBR） with different powdered activated carbon （PAC） dosage was detected with steric exclusion liquid chromatography. The results showed that macromolecules with molecular weight higher than 10 × 10^3 increased when PAC dosage added from 1 g · L^-1 to 2 g · L^- 1. Molecules with molecular weight less than 0.5 × 10^3 and within 3 × 10^3-10 × 10^3 kept almost no change, while molecules with molecular weight within 0.5 × 10^3-3 × 10^3 was reduced obviously. Membrane fouling rates were 2. 74 and 3. 10 kPa · m^- 1 respectively, which proved that the membrane fouling was mainly caused by macromolecules with molecular weight higher than 10 × 10^3.