The regulation of CO2 levels in a BLSS by controlling the solid waste treatment unit
The regulation of CO2 levels in a BLSS by controlling the solid waste treatment unit
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DOI：
10.1016/j.ecoleng.2016.01.048
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发表时间：
2016-05
影响因子：
3.8
通讯作者：
Guanghui Liu-;Yingying Dong;Beizhen Xie;Dawei Hu;Yuming Fu;C. Dong;Liang Li;Hong Liu
中科院分区：
文献类型：
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作者：
Guanghui Liu-;Yingying Dong;Beizhen Xie;Dawei Hu;Yuming Fu;C. Dong;Liang Li;Hong Liu
生物再生生命保障系统（BLSS）是为月球基地等长时间、远距离空间活动提供基本生命保障的人工封闭生态系统。我们团队建设了“月宫一号”实验设施，用于BLSS关键技术的集成研究，并于去年在“月宫一号”（一期）成功开展了为期105天的连续闭式集成BLSS实验。在这个系统中，由高等植物产生的二氧化碳供给机组人员的呼吸，同时也供给微生物的呼吸，微生物分解不可食用的植物生物量和人类废物等固体废物，而机组人员和微生物产生的二氧化碳则供给植物生长。在系统中，过高的co2水平会影响植物生长，危害人体健康，但过低的co2水平也会抑制植物生长。因此，保持co2和o2水平的平衡对系统气体调节至关重要，是系统运行稳定的关键之一。本研究基于“月宫一号”的微生物发酵，构建了高效可控的固体废物生物转化器，并在105天的密闭实验中，对最佳发酵条件下生物转化器的co2生成进行了监测。此外，还研究了生物转炉温度在33 ~ 45℃（45 ~ 33℃）范围内升高或降低co2产量的变化情况，得出co2产量与发酵温度呈正相关关系。因此，通过改变生物转化器的温度可以有效地调节co2的产量，这意味着通过控制固体废物处理单元的发酵条件来调节BLSS中co2和o2浓度的平衡是可行的。本研究结果可为“月宫一号”后续的研究奠定基础。
A bioregenerative life support system (BLSS) is an artificial closed ecosystem which provides basic human life support for long-duration and far-distance space activities such as lunar bases. “Lunar Palace 1”, an experimental facility, was constructed by our team for the integration research of the key technologies in BLSS, and then a continuous 105-day closed integrative BLSS experiment was carried out in “Lunar Palace 1”(Stage I) successfully last year. In such a system, O2produced by higher plants is supplied for the breathing of the crew, as well as the respiration of microorganisms which decompose the solid wastes such as inedible plant biomass and human wastes, while CO2produced by the crew and microorganisms is provided for plants to grow. In the system, an excessively high CO2level can affect plant growth and may harm human health, however, if the CO2level is too low, plant growth may also be inhibited. Thus, keeping the balance between CO2and O2levels is essential to the gas regulation in the system, and is one of the key points for the operation stability of the system. In this study, an efficient and controllable solid waste bio-convertor was built based on the microbial fermentation in “Lunar Palace 1”, and the CO2generation of the bio-convertor under the optimum fermentation conditions in the 105-day airtight experiment was monitored. Moreover, the changes of CO2production along with increasing or reducing the temperature of the bio-convertor from 33 to 45 °C (or from 45 to 33 °C) were also investigated, and a positive correlation between the CO2output and the fermentation temperature was obtained accordingly. Therefore, the CO2production can be adjusted effectively by changing the temperature of the bio-convertor, which implies that it is feasible to regulate the balance between the CO2and O2concentrations in BLSS by controlling the fermentation conditions of the solid waste treatment unit. The results of this study could lay a foundation for the following researches conducted in “Lunar Palace 1”.