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Ultrafiltration of Thin Stillage from Conventional and E-Mill Dry Grind Processes

机译：常规和电子磨干磨工艺对稀釜馏物的超滤

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摘要

We used ultrafiltration (UF) to evaluate membrane filtration characteristics of thin stillage and determine solids and nutrient compositions of filtered streams. To obtain thin stillage, corn was fermented using laboratory methods. UF experiments were conducted in batch mode under constant temperature and flow rate conditions. Two regenerated cellulose membranes (10 and 100 kDa molecular weight cutoffs) were evaluated with the objective of retaining solids as well as maximizing permeate flux. Optimum pressures for 10 and 100 kDa membranes were 207 and 69 kPa, respectively. Total solids, ash, and neutral detergent fiber contents of input TS streams of dry grind and E-Mill processes were similar; however, fat and protein contents were different (p < 0.05). Retentate obtained from conventional thin stillage fractionation had higher mean total solids contents (27.6% to 27.8%) compared to E-Mill (22.2% to 23.4%). Total solids in retentate streams were found similar to those from commercial evaporators used in industry (25% to 35% total solids). Fat contents of retentate streams ranged from 16.3% to 17.5% for the conventional process. A 2% increment in fat concentration was observed in the E-Mill retentate stream. Thin stillage ash content was reduced 60% in retentate streams.
机译：我们使用超滤（UF）来评估稀釜馏物的膜过滤特性，并确定过滤流的固体和营养成分。为了获得稀釜馏物，使用实验室方法将玉米发酵。 UF实验以间歇模式在恒定温度和流速条件下进行。评估了两个再生纤维素膜（截留分子量分别为10和100 kDa），目的是保留固体并最大化渗透通量。 10和100 kDa膜的最佳压力分别为207和69 kPa。干磨和E-Mill工艺的输入TS流中的总固体，灰分和中性洗涤剂纤维含量相似。但是，脂肪和蛋白质含量不同（p <0.05）。与E-Mill（22.2％至23.4％）相比，常规稀釜馏分馏得到的渗余物具有更高的平均总固体含量（27.6％至27.8％）。发现渗余物流中的总固体与工业上使用的商用蒸发器中的总固体相似（总固体的25％至35％）。对于常规方法，截留物流中的脂肪含量为16.3％至17.5％。在E-Mill滞留物流中观察到脂肪浓度增加了2％。滞留物流中的稀釜馏物灰含量降低了60％。

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