State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China; University of Chinese Academy of Sciences, Beijing 100049, China.
State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China.
Sci Total Environ. 2019 Dec 20;697:134009. doi: 10.1016/j.scitotenv.2019.134009. Epub 2019 Aug 20.
Sediment bulking was closely related to the occurrence of black water agglomerate in anoxic aquatic sediments. Real-time monitoring of sediment bulking can be labor intensive and technically difficult, especially in dynamic environments where a record of variation in height over time is desired. In this study, a vertically distributed multi-anodes sediment microbial fuel cell (SMFC) as biosensor was developed for monitoring the changes in sediment height. According to the principle of sediment microbial fuel cell (SMFC), the voltage of SMFC would increase when the anode embedded into the sediment. The results showed that when the anode buried in the sediment, the biosensing system delivered voltage can increase to 40 mV, where the power density of SMFC exceeded 10 mW m with overshoot of power density appeared. However, for the anodes above the water-sediment interface, the voltages and power densities kept at around 0. The redundancy analysis further indicated that the labile carbon pool-I of sediment was a key factor for sediment bulking, which led to drastic changes in sediment characteristics. The results from this study can provide a simple strategy for identifying sediment bulking in shallow lakes.
底泥膨胀与缺氧水体内底泥黑块的形成密切相关。底泥膨胀的实时监测既耗费人力，技术上也有难度，特别是在需要记录一段时间内高度变化的动态环境中。本研究开发了一种垂直分布的多阳极沉积物微生物燃料电池（SMFC）作为生物传感器，用于监测底泥高度的变化。根据沉积物微生物燃料电池（SMFC）的原理，当阳极嵌入沉积物时，SMFC 的电压会升高。结果表明，当阳极埋在沉积物中时，生物传感系统的输出电压可以增加到 40mV，此时 SMFC 的功率密度超过 10mW/m，出现功率密度过冲。然而，对于位于水-沉积物界面之上的阳极，电压和功率密度则保持在约 0mV。冗余分析进一步表明，沉积物中的易降解碳库 I 是底泥膨胀的关键因素，这导致了底泥特性的剧烈变化。本研究的结果可为识别浅水湖泊中的底泥膨胀提供一种简单的策略。
