Biosorption of diesel and lubricating oil on algal biomass
Biosorption of diesel and lubricating oil on algal biomass
复制标题
藻类生物质对柴油和润滑油的生物吸附
作者：
P. Mishra;S. Mukherji
藻类作为生物吸附剂被广泛应用于重金属的吸附，然而藻类对石油的吸附还没有被探索。海洋和淡水环境中的藻类会影响溢油的归宿和运移。研究了螺旋藻（Spirulina sp.）和栅列藻（Scenedesmus abundans）死体对柴油和润滑油的吸附性能。在含有悬浮在水中的油（0.1- 2%，v/v）和生物质（0.1%）的充分混合的分批系统中研究吸附的速率和程度。柴油在螺旋藻上的吸附是瞬时的。速率限制吸附藻类生物质可以解释的伪二级模型，并在12天内建立平衡。Freundlich和Langmuir吸附模型对柴油在藻类上的吸附有较好的拟合效果，但对润滑油的吸附效果不理想。一个三参数模型，Sips模型，提供了良好的拟合所有实验产生的等温线，并产生了柴油和润滑油的最大吸附容量在12-14克/克的范围内。藻类对石油的吸附与其他溢油清理吸附剂相当。藻类可用于开发低成本吸附剂，并可促进从污染水中去除油。吸附作用受油的类型和藻类的类型的影响。这是第一项研究表明，润滑油中存在的添加剂不仅降低了吸附速率，而且改变了吸附平衡，使得双参数等温线是不够的。
Algae are widely used as biosorbent for the sorption of heavy metals, however sorption of oil on algae has not been explored. Algae in marine and fresh water environment may affect the fate and transport of spilled oil. Sorption of diesel and lubricating oil was studied using dead biomass of Spirulina sp. and Scenedesmus abundans. The rate and extent of sorption was studied in well mixed batch systems containing oil (0.1–2 %, v/v) and biomass (0.1 %) suspended in water. Sorption of diesel on Spirulina sp. was instantaneous. Rate limited sorption on algal biomass could be explained by the pseudo-second order model and equilibrium was established within 12 days. The Freundlich and Langmuir model could provide adequate fit for diesel sorption on algae but not for lubricating oil. A three parameter model, the Sips model, provided good fit for all the experimentally generated isotherms and yielded maximum sorption capacity of diesel and lubricating oil in the range of 12–14 g/g. Oil sorption on algae was comparable to other spill clean-up sorbents. Algae can be used for development of low cost sorbents and can facilitate removal of oil from contaminated water. Sorption is affected both by the type of oil and type of algae. This is the first study illustrating that the additives present in lubricating oil not only reduces the sorption rate but also alters sorption equilibrium such that two-parameter isotherms are inadequate.