Zhang Min, Wang Junming, Zhang Zhongzhi, Song Zhaozheng, Zhang Zhenjia, Zhang Beiyu, Zhang Guangqing, Wu Wei-Min
State Key Laboratory of Heavy Oil Processing, College of Chemical Engineering, China University of Petroleum, Beijing, 102249, People's Republic of China.
Dalian Design Branch, China Petroleum Engineering & Construction Corporation, Dalian, 116011, China.
Environ Sci Pollut Res Int. 2016 Mar;23(5):4919-30. doi: 10.1007/s11356-015-5721-y. Epub 2015 Nov 9.
Heavy oil-produced water (HOPW) is a by-product during heavy oil exploitation and can cause serious environmental pollution if discharged without adequate treatment. Commercial biochemical treatment units are important parts of HOPW treatment processes, but many are not in stable operation because of the toxic and refractory substances, salt, present. Therefore, pilot-scale experiments were conducted to evaluate the performance of hydrolytic acidification-biological filter with airlift aeration (HA-BFAA), a novel HOPW treatment system. Four strains isolated from oily sludge were used for bioaugmentation to enhance the biodegradation of organic pollutants. The isolated bacteria were evaluated using 3-day biochemical oxygen demand, oil, dodecyl benzene sulfonic acid, and chemical oxygen demand (COD) removals as evaluation indices. Bioaugmentation enhanced the COD removal by 43.5 mg/L under a volume load of 0.249 kg COD/m(3) day and hydraulic retention time of 33.6 h. The effluent COD was 70.9 mg/L and the corresponding COD removal was 75.0 %. The optimum volumetric air-to-water ratio was below 10. The removal ratios of the total extractable organic pollutants, alkanes, and poly-aromatic hydrocarbons were 71.1, 94.4, and 94.0 %, respectively. Results demonstrated that HA-BFAA was an excellent HOPW treatment system.
稠油采出水是稠油开采过程中的副产物，如果未经适当处理就排放，会造成严重的环境污染。商业生化处理单元是稠油采出水处理工艺的重要组成部分，但由于存在有毒难降解物质和盐分，许多处理单元运行不稳定。因此，开展了中试实验，以评估气升曝气水解酸化-生物滤池（HA-BFAA）这一新型稠油采出水处理系统的性能。从含油污泥中分离出的4株菌株用于生物强化，以提高有机污染物的生物降解能力。以3日生化需氧量、石油类、十二烷基苯磺酸和化学需氧量（COD）去除率作为评价指标，对分离出的细菌进行评估。在容积负荷为0.249 kg COD/m³·d、水力停留时间为33.6 h的条件下，生物强化使COD去除量提高了43.5 mg/L。出水COD为70.9 mg/L，相应的COD去除率为75.0%。最佳气水体积比低于10。总可萃取有机污染物、烷烃和多环芳烃的去除率分别为71.1%、94.4%和94.0%。结果表明，HA-BFAA是一种优良的稠油采出水处理系统。
