期刊
DESALINATION
卷 180, 期 1-3, 页码 109-118出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.desal.2004.12.032
关键词
kraft black liquor; lignin; ultrafiltration; ceramic membranes
Two cooking liquors and a black liquor were fractionated by ultrafiltration. The liquors were withdrawn from different stages in a kraft pulp mill employing continuous digestion. The ultrafiltration was performed at 90 degrees C with two ceramic membranes with cut-offs of 5 kDa and 15 kDa. Only small differences in membrane performance were observed when concentrating the three liquors to 90% volume reduction. The average flux was 55 1/m(2) h for the 5 kDa membrane and about 1151/m(2)h for the 15 kDa membrane. The concentration of lignin was on average 230 and 155 g/L in the retentate from the 5 kDa and 15 kDa cut-off membranes. The ash content was reduced from 37-40 g/g total dry solids to 20-30 g/g after ultrafiltration.
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