论文标题
沿构造的湿地微生物燃料电池的流动路径的去除和细菌活性增强
Contaminants removal and bacterial activity enhancement along the flow path of constructed wetland microbial fuel cells
论文作者
论文摘要
在建造的湿地（CW-MFC）中实施的微生物燃料电池，尽管仍在研究中相对较新的技术，但已显示出可提高城市废水的治疗效率。到目前为止，所研究的绝大多数CW-MFC系统都是通过合成废水在相当不现实的液压条件下工作的实验室规模系统设计的。这项工作的主要目的是量化在更现实的设置中使用带有真正城市废水的水平流量的中等尺度系统在不同条件下运行的CW-MFCS性能。 Operational conditions tested were organic loading rate (4.9+-1.6, 6.7+-1.4 and 13.6+-3.2 g COD/m2.day) and hydraulic regime (continuous vs intermittent feeding) as well as different electrical connections: CW control (conventional CW without electrodes), open-circuit CW-MFC (external circuit between anode and cathode not connected) and closed-circuit CW-MFC (external电路连接）。八个水平地下流量CWS进行了大约四个月。每个湿地由一个0.193平方米的PVC储层组成，该水库装有4/8 mm花岗岩河流砾石。所有湿地都有用于砾石和间质液体采样的中间采样点。 CW-MFC被设计为三个MFC，沿CWS的流动路径又一次地融合在一起。结果表明，经过测试的有机负荷速率，液压状态或电气连接之间没有显着差异，但是，在连续流程下，在闭路CW-MFC模式下运行的系统平均超过了其他实验条件。与传统的CW控制系统相比，闭路CW-MFC分别显示出高约5％和22％的COD和铵去除。相应地，与CW控制系统相比，通过荧光素二乙酸酯技术测量的总体细菌活性在闭路系统中更高（4％至34％）。
Microbial fuel cells implemented in constructed wetlands (CW-MFCs), albeit a relatively new technology still under study, have shown to improve treatment efficiency of urban wastewater. So far the vast majority of CW-MFC systems investigated were designed as lab-scale systems working under rather unrealistic hydraulic conditions using synthetic wastewater. The main objective of this work was to quantify CW-MFCs performance operated under different conditions in a more realistic setup using meso-scale systems with horizontal flow fed with real urban wastewater. Operational conditions tested were organic loading rate (4.9+-1.6, 6.7+-1.4 and 13.6+-3.2 g COD/m2.day) and hydraulic regime (continuous vs intermittent feeding) as well as different electrical connections: CW control (conventional CW without electrodes), open-circuit CW-MFC (external circuit between anode and cathode not connected) and closed-circuit CW-MFC (external circuit connected). Eight horizontal subsurface flow CWs were operated for about four months. Each wetland consisted of a PVC reservoir of 0.193 m2 filled with 4/8 mm granitic riverine gravel. All wetlands had intermediate sampling points for gravel and interstitial liquid sampling. The CW-MFCs were designed as three MFCs incorporated one after the other along the flow path of the CWs. Results showed no significant differences between tested organic loading rates, hydraulic regimes or electrical connections, however, on average, systems operated in closed-circuit CW-MFC mode under continuous flow outperformed the other experimental conditions. Closed-circuit CW-MFC compared to conventional CW control systems showed around 5% and 22% higher COD and ammonium removal, respectively. Correspondingly, overall bacteria activity, as measured by the fluorescein diacetate technique, was higher (4% to 34%) in closed-circuit systems when compared to CW control systems.
