CAS Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; University of Chinese Academy of Sciences, Beijing 100049, PR China.
CAS Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China.
Sci Total Environ. 2018 Nov 15;642:77-89. doi: 10.1016/j.scitotenv.2018.06.049. Epub 2018 Jun 9.
Studies on membrane fouling during treatment of oil refinery wastewater (ORW) via membrane bioreactor (MBR) are currently lacking, and associated fouling challenges are largely undocumented. Using advanced chemical and Illumina sequencing approach, we investigated the complex bio-physiochemical interactions responsible for foulant-membrane interactions during treatment of ORW. After nearly 2 months of the MBR operation, COD removal reached maximal of 97.15 ± 1.85%, while oil and grease removal was maintained at 96.6 ± 2.6%, during the treatment duration. Most of the less or non-biodegradable oil moieties (>0.5 μm) progressively accumulated on the membrane as the influent oil concentration increased. Presence of relatively higher unsaturated extracellular polymers (100.6 mg/g VSS) like fulvic acid and aromatic-like compounds at high volumetric loading (~18.7 kg COD/m/d), enhanced the adsorption of chemical elements (Fe = 88.9, Al = 63.4, and Ce = 0.56 mg/g dry-sludge, respectively). Moreover, shift in microbial community structure to hydrocarbon-utilizing and metals-tolerating genera, as Comamonas and Rhodanobacter, respectively, uncovers major membrane colonizers in ORW treatment via MBR.
目前，关于膜生物反应器（MBR）处理炼油废水（ORW）过程中的膜污染研究还很缺乏，相关的污染挑战也大多没有记录。本研究采用先进的化学和 Illumina 测序方法，研究了处理 ORW 过程中导致污染物-膜相互作用的复杂生物物理化学相互作用。在 MBR 运行近 2 个月后，COD 去除率达到了 97.15 ± 1.85%的最大值，而在处理过程中，油和油脂的去除率保持在 96.6 ± 2.6%。随着进水油浓度的增加，大部分低生物降解或非生物降解的油分（>0.5 μm）逐渐在膜上累积。在高容积负荷（~18.7 kg COD/m/d）下，相对较高的不饱和胞外聚合物（100.6 mg/g VSS，如腐殖酸和芳香族化合物）的存在，增强了化学元素（Fe = 88.9，Al = 63.4，Ce = 0.56 mg/g 干污泥）的吸附。此外，微生物群落结构向烃类利用和金属耐受属（分别为Comamonas 和 Rhodanobacter）的转变，揭示了 MBR 处理 ORW 过程中的主要膜定植菌。
