聚合物驱油田采出水生化处理的表征

Characterization of Biological Treatment of Produced Water from Polymer Flooding Oilfield

用GC/MS和GC/FTIR分析了聚合物驱油田采出水及其生物膜法生化处理水中可被XAD系列树脂富集的有机组分 ,并用超滤技术测定了COD的分子量分布。结果表明 :两次采集的生化处理进水的COD为 10 2及117mg/L ,其中树脂可吸附的COD分别占 74 .1%及 74 .8% ;生化处理出水的COD为 6 7.5及 6 6 .9mg/L ,其中树脂可吸附的COD分别占 6 6 .4 %及 6 8.5 %。生化处理进水中树脂可吸附的有机物包括脂肪烃、苯系物、多环芳烃、苯酚类化合物及未知结构的有机酸 ,其中未知结构有机酸的含量较高。该废水经生化处理后 ,残余有机物主要为未知结构的有机酸。

Absorbable organic components by XAD series resins in produced water from a polymer flooding oilfield and its biological treatment effluents were analyzed using GC/MS and GC/FTIR. Dissolved organic matter apparent molecular weight distribution was also determinged by batch ultrafiltration. The results showed that COD of biological treatment infuents and effluents were 102-117 mg/L and 67.5-66.9 mg/L, and adsorbed COD accounted for 74.1-74.8% and 66.4-68.5%, respectively. Absorbed organic compounds in biological treatment infuents included aliphatic and aromatic hydrocarbons, polycyclic aromatics, phenolic compounds and unidentified organic acids of high content (～90%), the laters were supposed to be originated from hydrolysis and/or degradation of HPAM. After biological treatment by a biofilm process, the majority of residual organic matter was the organic acids. Relative high removal efficiencies were found for suspended and large molecular dissolved COD by the biological treatment.