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首页> 外文期刊>Bioprocess and Biosystems Engineering >Improving performance of a gas stripping-based recovery system to remove butanol from Clostridium beijerinckii fermentation
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Improving performance of a gas stripping-based recovery system to remove butanol from Clostridium beijerinckii fermentation

机译：提高基于气提的回收系统从拜氏梭菌发酵中去除丁醇的性能

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摘要

The effect of factors such as gas recycle rate, bubble size, presence of acetone, and ethanol in the solution/broth were investigated in order to remove butanol from model solution or fermentation broth ( also called acetone butanol ethanol or ABE or solvents). Butanol ( 8 g L-1, model solution, Fig. 2) stripping rate was found to be proportional to the gas recycle rate. In the bubble size range attempted (< 0.5 and 0.5 - 5.0 mm), the bubble size did not have any effect on butanol removal rate ( Fig. 3, model solution). In Clostridium beijerinckii fermentation, ABE productivity was reduced from 0.47 g L-1 h(-1) to 0.25 g L-1 h(-1) when smaller (< 0.5 mm) bubble size was used to remove ABE ( Fig. 4, results reported as butanol/ABE concentration). The productivity was reduced as a result of addition of an excessive amount of antifoam used to inhibit the production of foam caused by the smaller bubbles. This suggested that the fermentation was negatively affected by antifoam.
机译：为了从模型溶液或发酵液中除去丁醇（也称为丙酮丁醇乙醇或ABE或溶剂），研究了诸如气体循环速率，气泡大小，丙酮和乙醇在溶液/肉汤中的存在等因素的影响。发现丁醇（8 g L-1，模型溶液，图2）的汽提速率与气体循环速率成正比。在尝试的气泡大小范围内（<0.5和0.5-5.0 mm），气泡大小对丁醇去除率没有任何影响（图3，模型溶液）。在拜氏梭菌发酵中，当使用较小的气泡尺寸（<0.5 mm）去除ABE时，ABE生产率从0.47 g L-1 h（-1）降低至0.25 g L-1 h（-1）（图4，结果报告为丁醇/ ABE浓度）。由于添加了过量的消泡剂以抑制由较小气泡引起的泡沫的产生，导致生产率降低。这表明发酵受到消泡剂的负面影响。

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