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首页> 外文会议>International Conference on Environmental Systems >Development and verification of an electrode system for electrolytic generation of silver ion biocide for the Space Station internal thermal control system fluid
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Development and verification of an electrode system for electrolytic generation of silver ion biocide for the Space Station internal thermal control system fluid

机译：用于空间站内部热控制系统流体的银离子杀生物剂电解产生电极系统的开发和验证

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The Space Station Internal Thermal Control System (ITCS) fluid formulation is composed of a buffer solution consisting of a mixture of tri-sodium phosphate and sodium borate that produce a pH of approximately 9.5. A silver ion concentration is also specified in the formulation to assist in the control of microorganisms. The specification for the fluid places tight control on the allowed total organic carbon (TOC) concentration to further control possible food sources for microorganisms. Various ground tests conducted on the Laboratory and Airlock modules have demonstrated that the TOC specification is hard to maintain in a test environment. Test data also demonstrate that silver ion depletes as it comes in contact with various metals in the ITCS loop. When the silver is depleted, the microorganism populations can rapidly increase to a range of 105 to 106 colony forming units (CFU) per 100 milliliter. The potential for microorganisms to form biofilms that are known to cause heat transport and corrosion problems has raised concern and initiated a search for a way to introduce silver ions into the ITCS loop. Electrolysis was chosen as a viable approach for continuous slow injection of silver ion into the ITCS fluid. A silver electrode system has been developed and tested to demonstrate effectiveness for ITCS fluid. The electrode system controlling circuit was designed to operate with pulsed polarity switching to minimize contamination buildup on the electrodes. A desired silver generation rate is achieved by precise control of the voltage and circuit duty cycle. The data from this paper demonstrate the utility of the system for rapid 6-log reduction of large populations of microorganisms to less than detectable levels within 12 hours.
机译：空间站内部热控制系统（ITCS）流体制剂由由产生的三钠和硼酸钠的混合物组成，该缓冲溶液产生约9.5的pH。在制剂中还规定了银离子浓度，以帮助控制微生物。流体的规范在允许的总有机碳（TOC）浓度上的紧密控制，以进一步控制可用于微生物的食物来源。在实验室和气闸模块上进行的各种地面测试已经证明了TOC规范在测试环境中是难以维持的。测试数据还证明了银离子耗尽，因为它与ITCS环中的各种金属接触。当银耗尽时，微生物群可以在每100毫升/ 100毫升的105至106个菌落形成单元（CFU）的范围内。微生物形成众所周知的生物膜引起热输送和腐蚀问题的潜力提出了令人关切的问题并开始寻找一种将银离子引入ITCS环路的方法。选择电解作为连续将银离子慢进入ITCS流体的可行方法。已经开发并测试了银电极系统以证明ITCS流体的有效性。设计电极系统控制电路以利用脉冲极性切换操作以最小化电极上的污染积累。通过精确控制电压和电路占空比来实现所需的银产生速率。本文的数据展示了系统的效用，用于在12小时内快速地6次微生物群的大量的微生物群体少于可检测水平。

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