期刊
MEMBRANES
卷 12, 期 11, 页码 -出版社
MDPI
DOI: 10.3390/membranes12111057
关键词
fouling analysis; one-stage ultrafiltration; primary recovery; surfactin; pretreated fermentation liquors
类别
资金
- Ministry of Science and Technology, Taiwan [MOST 109-2221-E-182-024-MY3]
This study investigated the primary recovery of surfactin from precipitation-pretreated fermentation broths using one-stage dead-end and cross-flow ultrafiltration. The results showed that the use of a polyethersulfone membrane and addition of ethanol were effective in recovering surfactin under suitable conditions. The Hermia model was used to understand membrane fouling mechanisms, and appropriate cleaning agents and methods were selected to restore membrane flux.
Primary recovery of surfactin from precipitation-pretreated fermentation broths of Bacillus subtilis ATCC 21332 culture by one-stage dead-end and cross-flow ultrafiltration (UF) was studied. Dead-end experiments were first performed to select suitable conditions, including the amount of added ethanol-a micelle-destabilizing solvent (0-70 vol%), type (polyethersulfone, polyacrylonitrile, poly(vinylidene fluoride)) and molecular-weight cut-off (MWCO, 30-100 kDa) of the membrane in the surfactin concentration range of 0.25-1.23 g/L. Then, the cross-flow UF experiments were conducted to check the recovery performance in the ranges of feed surfactin concentration of 1.13-2.67 g/L, flow velocity of 0.025-0.05 m/s, and transmembrane pressure of 40-100 kPa. The Hermia model was also used to clarify membrane fouling mechanisms. Finally, three cleaning agents and two in situ cleaning ways (flush and back-flush) were selected to regain the permeate flux. As for the primary recovery of surfactin from the permeate in cross-flow UF, a polyethersulfone membrane with 100-kDa MWCO was suggested, and the NaOH solution at pH 11 was used for membrane flushing.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据