...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Biotechnology Progress >Adsorption-Desorption Process Using Wood-Based Activated Carbon for Recovery of Biosurfactant from Fermented Distillery Wastewater
【24h】

Adsorption-Desorption Process Using Wood-Based Activated Carbon for Recovery of Biosurfactant from Fermented Distillery Wastewater

机译：木质基活性炭吸附解吸工艺从发酵酒废水中回收生物表面活性剂

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Methods used for biosurfactant recovery include solvent extraction,precipitation,crystallization,centrifugation and foam fractionation.These methods cannot be used when distillery wastewater (DW) is used as the nutrient medium for biosurfactant production by Pseudomonas aeruginosa strain BS2,because recovery of biosurfactant by any of these methods imparts color to the biosurfactant.The biosurfactant has a nonaesthetic appearance with lowered surface active properties.These methods cannot be used for continuous recovery of biosurfactant during cultivation.Hence,a new downstream technique for biosurfactant recovery from fermented DW comprised of adsorption-desorption processes using wood-based activated carbon (WAC) was developed.This study involves batch experiments to standardize the factors affecting the rate of biosurfactant adsorption onto WAC.WAC was the most efficient adsorbent among various ones tested (i.e.,silica gel,activated alumina and zeolite).The WAC (1% w v"1),equilibrium time (90 min),pH range of 5-10 and temperature of 40 °C were optimum to achieve 99.5% adsorption efficiency.Adsorption kinetics and intraparticle diffusion studies revealed the involvement of both boundary layer diffusion and intraparticle diffusion.The Langmuir adsorption isotherm of WAC indicated the formation of a monolayer coverage of the biosurfactant over a homogeneous carbon surface,while the Freundlich isotherm showed high adsorption at strong solute concentrations and low adsorption at dilute solute concentrations.WAC concentration of 4% w v"1 facilitated complete removal of the biosurfactant from collapsed foam (contained 5-fold higher concentration of biosurfactant than was present in fermented DW).Biosurfactant adsorption was of chemisorption type.Acetone (polar solvent) was a specific viable eluant screened among various ones tested because it selectively facilitated maximum recovery,i.e.,89% biosurfactant from WAC.By acetone treatment,complete regeneration of WAC was feasible and WAC can be reused for biosurfactant recovery up to 3 cycles.The recovered biosurfactant showed improved surface-active property (i.e.,much lower critical micelle concentration value of 0.013 verses 0.028 mg mLr1 for biosurfactant recovered by classical methods).The reuse potential of WAC was assessed and results suggest that the carbon can be reused for three consecutive cycles for biosurfactant adsorption from fermented wastewater without any decrease in adsorption efficiency.Thus,this process forms a basis for continuous recovery of biosurfactant from fermented DW and concentrated foam.This process reduces the use of high cost solvent,avoids end product inhibition and minimizes product degradation.
机译：用于回收生物表面活性剂的方法包括溶剂萃取，沉淀，结晶，离心和泡沫分馏。当使用蒸馏废水（DW）作为铜绿假单胞菌菌株BS2生产生物表面活性剂的营养培养基时，这些方法将无法使用，因为任何方法都可以回收生物表面活性剂。这些方法赋予生物表面活性剂以颜色。生物表面活性剂具有非美学外观，降低了表面活性。这些方法不能用于在培养过程中连续回收生物表面活性剂。因此，一种从发酵DW中回收生物表面活性剂的新的下游技术包括吸附-开发了使用木质活性炭（WAC）的解吸工艺。该研究涉及分批实验，以标准化影响生物表面活性剂吸附到WAC上的速率的因素。WAC是各种测试的吸附剂（例如硅胶，活性氧化铝）中最有效的吸附剂。和沸石）。WAC（1％wv“ 1），平衡在90分钟的时间内，最适pH值为5-10，温度为40°C以达到99.5％的吸附效率。吸附动力学和颗粒内扩散研究表明，边界层扩散和颗粒内扩散均参与其中.Langmuir吸附等温线WAC的值表明在均匀碳表面上形成了生物表面活性剂的单层覆盖，而Freundlich等温线在强溶质浓度下显示出高吸附，而在稀溶质浓度下显示出低吸附。4％wv“ 1的WAC浓度有助于完全去除表面活性剂。塌陷泡沫中的生物表面活性剂（生物表面活性剂的浓度比发酵DW中高5倍）。生物表面活性剂的吸附是化学吸附类型。丙酮（极性溶剂）是在各种测试中筛选出的特定可行洗脱液，因为它选择性地促进了最大回收率即89％来自WAC的生物表面活性剂。通过丙酮处理，WAC的完全再生为fe asible和WAC可重复使用多达3个周期的生物表面活性剂。回收的生物表面活性剂显示出改善的表面活性（即，通过传统方法回收的生物表面活性剂的临界胶束浓度值低得多，为0.013对0.028 mg mLr1）。对WAC进行了评估，结果表明该碳可以连续三个循环重复使用以从发酵废水中吸附生物表面活性剂，而不会降低吸附效率。因此，该过程为从发酵DW和浓缩泡沫中连续回收生物表面活性剂奠定了基础。减少了高成本溶剂的使用，避免了最终产品的抑制，并最大程度地减少了产品降解。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号