Department of Chemical and Biological Engineering, Zhejiang University, Hangzhou, PR China.
Bioresour Technol. 2013 Mar;131:1-5. doi: 10.1016/j.biortech.2012.12.128. Epub 2012 Dec 25.
Waste crude oil emulsion was inevitably produced in the petroleum industrial process, causing harmful impact on the ecological and social environment. In this study, rhamnolipid was for the first time investigated for demulsification of waste crude oil. As found in this paper, rhamnolipid treatment could obtain over 90% of dewatering efficiency on refractory waste crude oil and such efficient demulsification was confirmed on model emulsions. As further demonstrated on the pilot scale (100 L), rhamnolipid treatment could recover over 98% of crude oil from the wastes. The recovered oil contained less than 0.3% of water and thus can directly re-enter into refinery process while the aqueous phase can be disposed into dischargeable water due to largely reduced soluble COD after subjected to 5 days of active sludge treatment. It seems that rhamnolipids as biodemulsifiers were of great prospects in the industrial demulsification of waste crude oil.
在石油工业过程中不可避免地会产生废原油乳状液，对生态和社会环境造成有害影响。在本研究中，首次研究了鼠李糖脂对废原油的破乳作用。本文发现，鼠李糖脂处理可使难处理的废原油的脱水效率超过 90%，并且在模型乳液中得到了这种有效的破乳效果。在中试规模（100L）进一步证明，鼠李糖脂处理可从废水中回收超过 98%的原油。回收的油中含水量低于 0.3%，因此可以直接重新进入炼油工艺，而水相经过 5 天的活性污泥处理后，由于可溶性 COD 大大降低，可以排入可排放水中。似乎生物破乳剂鼠李糖脂在废原油的工业破乳方面具有广阔的前景。
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