College of Environmental Science and Engineering, Qingdao University, Qingdao, China.
College of Environmental Science and Engineering, Qingdao University, Qingdao, China.
J Environ Manage. 2022 Jun 15;312:114913. doi: 10.1016/j.jenvman.2022.114913. Epub 2022 Mar 17.
A novel electrochemical active biofilms constructed wetland (NEAB-CW) was built to enhance the treatment efficiency for domestic sewage under low temperature environment (0-15 °C). In NEAB-CW, the traditional matrixes were replaced with conductive layer, in which laid stainless steel mesh tubes (SSMT) and added slow-release oxygen matrixes (SROM) and zero-valent iron rod (IR) were used to build a bioelectrochemical activity biofilms system. According to the results of 180 d experiment, the removal efficiencies of COD, NH-N and TP of NEAB-CW were 1.52 and 2.21, 2.97 and 1.68, 3.95 and 1.76 times higher than the CW without SROM and IR at 10-20 and 0-10 °C, respectively. The transverse and longitudinal electric potential (EP) variations in NEAB-CW improved microbial activities under low temperature by enhancing the electron transfer efficiency, resulting in higher and stable EP and electron currents density, as well as protein-like contents secreted from biofilms. The pollutant-degrading microorganisms (e.g., Clostridia, Simplicispira), low temperature-resistant microorganisms (e.g., Psychrobacter, Acinetobacter), and electrochemical active microorganisms (e.g., Negativicutes, Gammaproteobacteria) obviously accumulated in NEAB-CW under low temperature environment to generate electricity and degrade pollutants. The results provided a good choice to treat domestic sewage at 0-15 °C by using NEAB-CW.
一种新型电化学活性生物膜构建湿地（NEAB-CW）被构建以提高低温环境（0-15°C）下生活污水的处理效率。在 NEAB-CW 中，传统基质被导电层取代，在其中铺设不锈钢网管（SSMT）并添加缓释氧基质（SROM）和零价铁棒（IR），以构建生物电化学活性生物膜系统。根据 180 天实验的结果，在 10-20°C 和 0-10°C 时，NEAB-CW 对 COD、NH-N 和 TP 的去除效率分别比没有 SROM 和 IR 的 CW 高 1.52 和 2.21 倍、2.97 和 1.68 倍、3.95 和 1.76 倍。NEAB-CW 的横向和纵向电动势（EP）变化通过提高电子传递效率来提高低温下微生物的活性，从而产生更高和更稳定的 EP 和电子电流密度，以及生物膜中分泌的蛋白样物质。在低温环境下，污染物降解微生物（如梭菌、单胞菌）、耐低温微生物（如嗜冷菌、不动杆菌）和电化学活性微生物（如阴性杆菌、γ-变形菌）明显在 NEAB-CW 中积累，以发电和降解污染物。该结果为利用 NEAB-CW 在 0-15°C 下处理生活污水提供了一个很好的选择。
