School of Environmental Science and Engineering, Yancheng Institute of Technology, Yancheng, 224051, China.
School of Environmental Science and Engineering, Yancheng Institute of Technology, Yancheng, 224051, China.
J Environ Manage. 2022 Oct 15;320:115951. doi: 10.1016/j.jenvman.2022.115951. Epub 2022 Aug 11.
In this study, the effect of rhamnolipids (RL) on m-dichlorobenzene (m-DCB) removal and biofilm was investigated in two biotrickling filters (BTF) (BTF1: blank control; BTF2: RL addition). The critical micelle concentration (CMC) value of RL was 75.6 mg L, and the RL could significantly improve the solubilization of m-DCB. The results showed that the optimal concentration of RL was 180 mg L. The removal efficiency (RE) of m-DCB dropped by 42.4% for BTF1 no fed with RL and only 28.2% for BTF2 fed with RL when the inlet concentration increased from 200 to 1400 mg m at an empty bed time (EBRT) of 60 s. RL increased the secretion of extracellular polymers (EPS) and the ratio of Protein/Polysaccharide, which improved the mass transfer of m-DCB to the biofilm. RL also had a facilitating effect on catechol-1,2-dioxygenase (CO) enzyme activity. Furthermore, RL increased Zeta potential and facilitated microorganisms to form biofilm. The dominant microorganisms of microbial community were increased and the application of RL promoted the enrichment of them.
在这项研究中，考察了鼠李糖脂（RL）对两个生物滴滤器（BTF）（BTF1：空白对照；BTF2：RL 添加）中间二氯苯（m-DCB）去除和生物膜的影响。RL 的临界胶束浓度（CMC）值为 75.6mg/L，RL 可显著提高 m-DCB 的增溶能力。结果表明，RL 的最佳浓度为 180mg/L。当入口浓度从 200mg/m 增加到 1400mg/m 时，EBRT 为 60s，对于未添加 RL 的 BTF1，m-DCB 的去除效率（RE）下降了 42.4%，而对于添加 RL 的 BTF2，RE 仅下降了 28.2%。RL 增加了胞外聚合物（EPS）和蛋白质/多糖的分泌比例，从而提高了 m-DCB 向生物膜的传质。RL 还对儿茶酚-1,2-双加氧酶（CO）酶活性有促进作用。此外，RL 增加了 Zeta 电位，有利于微生物形成生物膜。微生物群落的优势微生物增加，RL 的应用促进了它们的富集。
