Agricultural and Biological Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.
Bioresour Technol. 2010 Jun;101(11):3859-63. doi: 10.1016/j.biortech.2009.12.127. Epub 2010 Feb 6.
The effectiveness of microfiltration (MF) and ultrafiltration (UF) for nutrient recovery from a thin stillage stream was determined. When a stainless steel MF membrane (0.1microm pore size) was used, the content of solids increased from 7.0% to 22.8% with a mean permeate flux rate of 45L/m(2)/h (LMH), fat increased and ash content decreased. UF experiments were conducted in batch mode under constant temperature and flow rate conditions. Permeate flux profiles were evaluated for regenerated cellulose membranes (YM1, YM10 and YM100) with molecular weight cut offs of 1, 10 and 100kDa. UF increased total solids, protein and fat and decreased ash in retentate stream. When permeate streams from MF were subjected to UF, retentate total solids concentrations similar to those of commercial syrup (23-28.8%) were obtained. YM100 had the highest percent permeate flux decline (70% of initial flux) followed by YM10 and YM1 membranes. Sequential filtration improved permeate flux rates of the YM100 membrane (32.6-73.4LMH) but the percent decline was also highest in a sequential MF+YM100 system. Protein recovery was the highest in YM1 retentate. Removal of solids, protein and fat from thin stillage may generate a permeate stream that may improve water removal efficiency and increase water recycling.
从稀酒糟流中确定微滤（MF）和超滤（UF）回收营养物的效果。当使用不锈钢 MF 膜（0.1μm 孔径）时，固体含量从 7.0%增加到 22.8%，平均渗透通量为 45L/m(2)/h（LMH），脂肪增加，灰分减少。在恒定温度和流速条件下进行分批 UF 实验。再生纤维素膜（YM1、YM10 和 YM100）的渗透通量曲线的评估，它们的分子量截止值分别为 1、10 和 100kDa。UF 增加了截留物中的总固体、蛋白质和脂肪，降低了灰分。当 MF 的渗透物流进行 UF 时，截留物中的总固体浓度类似于商业糖浆（23-28.8%）。YM100 的初始通量下降百分比最高（70%），其次是 YM10 和 YM1 膜。顺序过滤提高了 YM100 膜的渗透通量（32.6-73.4LMH），但在顺序 MF+YM100 系统中，下降百分比也是最高的。YM1 截留物中的蛋白质回收率最高。从稀酒糟中去除固体、蛋白质和脂肪可以产生渗透物流，从而提高水去除效率并增加水的循环利用。
