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Carbon dioxide removal from air by microalgae cultured in a membrane-photobioreactor

机译：膜光生物反应器中培养的微藻从空气中去除二氧化碳

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Elevated CO_2 levels in a closed space or room are of big concerns in many situations.Controlling the CO_2 level within a certain range is one of the most important tasks in a life support system.In this paper,a 101 photobioreactor integrated with a hollow fiber membrane module was constructed to remove CO_2 from air by using the photosynthetic microalga,Chlorella vulgaris.The effects of the inlet CO_2 concentration and the introduction of the membrane module on microalgal CO_2 fixation were investigated.The results showed that the proper inlet CO_2 concentration was determined to be 1.0%,based on the description of the growth characteristics of the microalga,and the gas exchange efficiency was improved greatly when the membrane module was adopted.Compared with an ordinary photobioreactor,not only the retention time of the smaller and more uniform gas bubbles in the new membrane-photobioreactor increased from 2 s to more than 20 s,but also the dissolved oxygen (DO) dropped by a factor of 30,resulting in the enhancement of the CO_2 fixation rate from 80 to260mgl~(-1) h~(-1).When the operating conditions were controlled at cell density of 2.0 x 10~7 cells ml(-1),inlet gas flow rate of 31 min~(-1),and light intensity of 157.6 mu Em~(-2)s~(-1) at 25-30 deg C,the 1.0% (v/v) CO_2 in the input aeration gas could be reduced to 0.3% in the discharged gas.Using normal room air (0.04% CO_2) as feed,the CO_2 concentration in the discharged gas could be decreased to the boundary value of 0.015%,indicating that the novel membrane-photobioreactor by intensifying the process of CO_2 conversion and fixation during the microalgal photosynthesis may be a promising solution to CO_2 removal in a closed space or room.
机译：在许多情况下，封闭空间或房间中的CO_2水平升高是一个大问题。将CO_2水平控制在一定范围内是生命维持系统中最重要的任务之一。本文研究了一种集成了中空纤维的101光生物反应器利用光合微藻构建小球藻膜组件以去除空气中的CO_2。研究了入口CO_2浓度和膜组件的引入对微藻CO_2固定的影响，结果表明确定了合适的入口CO_2浓度。在描述微藻生长特性的基础上，将其提高为1.0％，采用膜组件时，气体交换效率大大提高。与普通的光生物反应器相比，不仅更小，更均匀的气体的保留时间新型膜光生物反应器中的气泡从2 s增加到20 s以上，但溶解氧（DO）下降了一个因子30时，导致CO_2固定率从80提高到260mgl〜（-1）h〜（-1）。当操作条件控制在细胞密度为2.0 x 10〜7个细胞ml（-1）时，进样口气体流速为31 min〜（-1），在25-30摄氏度下的光强度为157.6μEm〜（-2）s〜（-1），输入曝气中的CO2含量为1.0％（v / v）排放气体中的气体浓度可降低至0.3％。以正常室内空气（0.04％CO_2）为原料，排放气体中的CO_2浓度可降低至0.015％的边界值，表明新型膜光生物反应器加强微藻光合作用过程中CO_2转化和固定的过程可能是在封闭空间或室内去除CO_2的有前途的解决方案。

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