ABSTRACT

This work shows the efficiency of wash waters from lipopeptide production as a remediation strategy to treat urban water samples contaminated with p-cresol. The harvesting step in surfactin production involved a centrifugation step, generating a major soluble fraction and a fraction that is adsorbed to the biomass. The adsorbed fraction was recovered by washing steps. These wash waters containing lipopeptides (mostly surfactins), were successfully used to adsorb and solubilize p-cresol. The method of decontamination applied to an artificially contaminated natural water was monitored using a biosensor based on laccase/magnetic nanoparticles. Given the amount of surfactin within the wash water, the removal of p-cresol from artificially contaminated water was approximately 46.0%. This result confirms the successful and sustainable application of surfactin-rich wash waters to remove p-cresol from artificially contaminated natural water. The adsorption mechanism is potentially based on a multi-layer adsorption process, considering Langmuir and Freundlich adsorption isotherms.

摘要

这项工作显示了将脂肽生产中的洗涤水作为一种修复策略来处理被对甲酚污染的城市水样的效率。表面活性素生产中的收获步骤涉及离心步骤，产生主要的可溶性部分和吸附到生物质的部分。吸附部分通过洗涤步骤回收。这些含有脂肽（主要是表面活性素）的洗涤水已成功用于吸附和溶解对甲酚。使用基于漆酶/磁性纳米粒子的生物传感器监测应用于人工污染的天然水的去污方法。给定洗涤水中表面活性素的量，人工污染水中对甲酚的去除率约为 46.0%。该结果证实了富含表面活性素的洗涤水可成功且可持续地应用于从人工污染的天然水中去除对甲酚。考虑到 Langmuir 和 Freundlich 吸附等温线，吸附机制可能基于多层吸附过程。