Department of Environmental Engineering, Konkuk University, Seoul 05029, Republic of Korea.
Department of Environmental Engineering, Konkuk University, Seoul 05029, Republic of Korea.
Sci Total Environ. 2020 Aug 10;729:138786. doi: 10.1016/j.scitotenv.2020.138786. Epub 2020 Apr 19.
Carbon capture and storage (CCS) technology used for reducing anthropogenic CO emissions involves the capture of CO from industrial sources and its injection into geological sinks, such as oil reservoirs and abandoned gas fields. To ensure environmental and public safety in implementing CCS technology, efficient CO-monitoring technology must be developed to detect potential CO leakage from CCS sites. Conventional CO sensors used for monitoring CCS sites are typically high in cost and require professional staff for maintenance. In this study, we developed a portable and low-cost colorimetric CO sensor with high soil CO detection efficiency for CCS sites. The sensor consists of a detection solution that contains the pH indicator cresol red encapsulated with a gas-permeable membrane. When CO enters the sensor through the membrane, the color of the pH indicator changes and this was quantified using an RGB (red, green, blue) application (app), an app that measures the RGB values of a given color. The change in G and B values of the detection solution showed a significant linear relationship with soil CO concentration determined via non-dispersive infra-red (NDIR) CO sensor (r = 0.98, p = 0.001), and thus these values were used for quantification of CO concentration. Tests using CO-injection chamber showed that the optical CO sensors can detect soil CO concentration of 0.1 to 30% within a few minutes. Field studies conducted at a natural CO vent and an artificial CO leakage site showed that the optical CO sensors can be applied in analyzing surficial CO leakage patterns. The advantage of this optical CO sensor when applied to field monitoring is that it is inexpensive and has few installation restrictions. Therefore, this optical CO sensor has a strong potential for use in monitoring CO leakages from CCS sites.
碳捕集与封存（CCS）技术用于减少人为 CO 排放，涉及从工业源捕获 CO 并将其注入地质封存库，如油藏和废弃气田。为了确保在实施 CCS 技术时的环境和公共安全，必须开发高效的 CO 监测技术来检测 CCS 场地潜在的 CO 泄漏。用于监测 CCS 场地的传统 CO 传感器通常成本高，并且需要专业人员进行维护。在这项研究中，我们开发了一种用于 CCS 场地的便携式、低成本比色 CO 传感器，具有较高的土壤 CO 检测效率。该传感器由检测溶液组成，其中包含 pH 指示剂甲酚红，并用透气膜包裹。当 CO 通过膜进入传感器时，pH 指示剂的颜色发生变化，这可以通过 RGB（红、绿、蓝）应用程序（app）进行量化，该应用程序可以测量给定颜色的 RGB 值。检测溶液的 G 和 B 值的变化与非分散红外（NDIR）CO 传感器测定的土壤 CO 浓度呈显著线性关系（r=0.98，p=0.001），因此这些值可用于 CO 浓度的定量。使用 CO 注入室进行的测试表明，光学 CO 传感器可以在几分钟内检测到 0.1%至 30%的土壤 CO 浓度。在天然 CO 通风口和人工 CO 泄漏点进行的现场研究表明，光学 CO 传感器可用于分析表面 CO 泄漏模式。将这种光学 CO 传感器应用于现场监测的优势在于它价格低廉，安装限制较少。因此，这种光学 CO 传感器在监测 CCS 场地的 CO 泄漏方面具有很大的潜力。
