Xu Lei, Zhao Yaqian, Doherty Liam, Hu Yuansheng, Hao Xiaodi
UCD Dooge Centre for Water Resource Research, School of Civil Engineering, University College Dublin, Belfield, Dublin 4, Ireland.
Key Laboratory of Subsurface Hydrology &Ecology in Arid Areas (Ministry of Education), School of Environmental Science &Engineering, Chang'an University, Xi'an 710054, China.
Sci Rep. 2016 May 20;6:26514. doi: 10.1038/srep26514.
MFC centered hybrid technologies have attracted attention during the last few years due to their compatibility and dual advantages of energy recovery and wastewater treatment. In this study, a MFC was integrated into a dewatered alum sludge (DAS)- based vertical upflow constructed wetland (CW). Powder activate carbon (PAC) was used in the anode area in varied percentage with DAS to explore its influences on the performance of the CW-MFC system. The trial has demonstrated that the inclusion of PAC improved the removal efficiencies of COD, TN and RP. More significantly, increasing the proportion of PAC from 2% to 10% can significantly enhance the maximum power densities from 36.58 mW/m(2) to 87.79 mW/m(2). The induced favorable environment for bio-cathode formation might be the main reason for this improvement since the content of total extracellular polymeric substances (TEPS) of the substrate in the cathode area almost doubled (from 44.59 μg/g wet sludge to 87.70 μg/g wet sludge) as the percentage of PAC increased to 10%. This work provides another potential usage of PAC in CW-MFCs with a higher wastewater treatment efficiency and energy recovery.
近年来，基于微生物燃料电池（MFC）的混合技术因其兼容性以及能量回收和废水处理的双重优势而备受关注。在本研究中，一个MFC被集成到一个以脱水明矾污泥（DAS）为基础的垂直上流人工湿地（CW）中。粉末活性炭（PAC）以不同比例与DAS一起用于阳极区域，以探讨其对CW-MFC系统性能的影响。试验表明，加入PAC提高了化学需氧量（COD）、总氮（TN）和溶解性正磷酸盐（RP）的去除效率。更显著的是，将PAC的比例从2%提高到10%可使最大功率密度从36.58 mW/m²显著提高到87.79 mW/m²。随着PAC比例增加到10%，阴极区域底物中总胞外聚合物（TEPS）的含量几乎翻倍（从44.59 μg/g湿污泥增加到87.70 μg/g湿污泥），诱导形成有利于生物阴极形成的环境可能是这种改善的主要原因。这项工作为PAC在CW-MFCs中的应用提供了另一种潜在用途，可实现更高的废水处理效率和能量回收。
