Investigation of lactate productivity in membrane bioreactors on C5/C6 carbohydrates

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논문

Investigation of lactate productivity in membrane bioreactors on C5/C6 carbohydrates

학술지

Journal of membrane science

저자명

Van Hecke, Wouter; Verhoef, Suzanne; Groot, Wim; Sarić , Marija; de Bunt, Bert van; de Haan, André De Wever, Heleen

초록

Abstract The aim of this work was to investigate the productivity of continuous lactate fermentations at increased cell densities on simulated lignocellulosic hydrolyzate and wheat straw hydrolyzates using Ca(OH)2 suspensions as base. To this end, a semi-automated membrane bioreactor prototype with external tubular membranes was designed and constructed. Long-term continuous fermentations were run in membrane bioreactor mode and compared to batch and continuous mode. Fouling of the membranes proved to be the major bottleneck in the process. The semi-automated membrane module switch elegantly circumvented this problem, allowing constant operating conditions throughout extended periods of time. Maximal productivities of 30.5gkg−1.h−1 could be reached in the prototype during 30.5h combined with an average lactate concentration of 85.4gkg−1 and complete consumption of C5 and C6 carbohydrates. In this fermentation zone, the (liquid) residence time was 2.8h. These numbers demonstrate significant performance improvements in comparison with batch and (regular) continuous conditions. Highlights <UL> <LI> The use of Ca(OH)2 leads to fouling of microfiltration membranes and hampers lactate production in MBR mode. </LI> <LI> A novel, semi-automated MBR prototype was designed and constructed and elegantly circumvented fouling. </LI> <LI> 30.5gkg−1.h−1 was reached at an average lactate concentration of 85.4gkg−1 and complete consumption of carbohydrates. </LI> <LI> Significant performance improvements in comparison with batch and (regular) continuous conditions were demonstrated. </LI> </UL>

발행연도

2017

발행기관

Elsevier

ISSN

0376-7388

ISSN

1873-3123

권

528

페이지

pp.336-345