藻类有机物的特性以及对超滤膜的污染

Characteristic of Algogenic Organic Matter(AOM) and Its Effect on UF Membrane Fouling

采用凝胶色谱、亲疏水性、荧光色谱等方法研究铜绿微囊藻类有机物的特性.结果表明,铜绿微囊藻类有机物(AOM)主要由亲水性组分构成,占78%,比紫外吸光度仅为1.1 L/(mg.m).超滤膜法测定结果表明,藻类有机物中相对分子质量>30 000的有机物占40%以上,并且主要由中性亲水性组分构成.荧光色谱分析表明,AOM中含有蛋白质类和腐殖质类物质.膜过滤试验表明,藻类有机物对超滤膜造成严重的通量下降,这可归结为大分子的中性亲水性组分堵塞膜孔的缘故.

Algogenic organic matter （AOM） was extracted from blue-green algae （Cyanobacteria） and its characteristics was determined by various methods including high-pressure size-exclusion chromatography （HP-SEC）, hydrophobic and hydrophilic fractionation and fluorescence excitation emission matrix （EEM）. The results showed that AOM was composed of hydrophilic fraction predominantly, account for 78%. The SUVA of AOM was only 1.1 L/（mg· m）. The analysis for relative molecular weight （Mr） demonstrated that organic matter greater than 30 000 accounted for above 40% and mostly was composed of neutral hydrophilic compound. EEM analyses revealed that protein-like and humic substances existed in AOM. A test for membrane filtration exhibited that AOM could make uhrafihration membrane substantial flux decline, which can be attributed to membrane pore clog caused by neutral hydrophilic compound with larger MW.