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首页> 外文期刊>Bioprocess and Biosystems Engineering >Long-term biological hydrogen production by agar immobilized Rhodobacter capsulatus in a sequential batch photobioreactor
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Long-term biological hydrogen production by agar immobilized Rhodobacter capsulatus in a sequential batch photobioreactor

机译：在连续的分批光生物反应器中，通过琼脂固定的荚膜红球菌长期生产生物氢

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摘要

In this study, agar immobilization technique was employed for biological hydrogen production using Rhodobacter capsulatus DSM 1710 (wild type) and YO3 (hup-mutant) strains in sequential batch process. Different agar and glutamate concentrations were tested with defined nutrient medium. Agar concentration 4% (w/v) and 4 mM glutamate were selected for bacterial immobilization in terms of rate and longevity of hydrogen production. Acetate concentration was increased from 40 to 60-100 and 60 mM gave best results with both bacterial strains immobilized in 4% (w/v) agar. Cell concentration was increased from 2.5 to 5 mg dcw mL(-1) agar and it was found that increasing cell concentration of wild-type strain caused decrease in yield and productivity while these parameters improved by increasing cell concentration of mutant strain. Also, the hydrogen production time has extended from 17 days up to 60 days according to the process conditions and parameters. Hydrogen production by immobilized photosynthetic bacteria is a convenient technology for hydrogen production as it enables to produce hydrogen with high organic acid concentrations comparing to suspended cultures. Besides, immobilization increases the stability of the system and allowed sequential batch operation for long-term application.
机译：在这项研究中，琼脂固定化技术被用于通过连续分批过程使用荚膜红细菌DSM 1710（野生型）和YO3（hup-mutant）菌株进行生物制氢。用确定的营养培养基测试了不同的琼脂和谷氨酸盐浓度。就产氢的速率和寿命而言，选择浓度为4％（w / v）的琼脂和4 mM谷氨酸用于细菌固定。将两种细菌菌株固定在4％（w / v）琼脂中时，乙酸盐浓度从40增加至60-100，并且60 mM效果最佳。细胞浓度从2.5 mg dcw mL（-1）琼脂增加至5 mg dcw mL（-1）琼脂，发现野生型菌株的细胞浓度增加会导致产量和生产力下降，而这些参数会通过增加突变菌株的细胞浓度而得到改善。而且，根据工艺条件和参数，制氢时间从17天延长到60天。固定化光合细菌产生氢是一种方便的制氢技术，因为与悬浮培养相比，它能够产生有机酸浓度高的氢。此外，固定化可提高系统的稳定性，并允许连续批量操作以长期应用。

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