Shanghai Key Lab for Urban Ecological Processes and Eco-Restoration, Zhejiang Tiantong Forest Ecosystem National Observation and Research Station, School of Ecological and Environmental Sciences, East China Normal University, Shanghai, China.
Shanghai Key Lab for Urban Ecological Processes and Eco-Restoration, Zhejiang Tiantong Forest Ecosystem National Observation and Research Station, School of Ecological and Environmental Sciences, East China Normal University, Shanghai, China; Institute of Eco-Chongming (IEC), No. 20 Cuiniao Road, ChenJiazhen, Shanghai 202162, China.
Bioresour Technol. 2021 Nov;339:125584. doi: 10.1016/j.biortech.2021.125584. Epub 2021 Jul 17.
Coking wastewater is typically refractory, mainly due to its biological toxicity and complex composition. In this study, a novel integrated biological-electrocatalytic process consisting of two three-dimensional electrochemical reactors (3DERs), two biological aerated filters (BAFs), and a three-dimensional biofilm electrode reactor (3DBER) is developed for the advanced treatment of coking wastewater. 73.21% of chemical oxygen demand (COD), 38.02% of ammonium nitrogen (NH-N) and 91.46% of nitrate nitrogen (NO-N) are removed by 3DERs. BAFs mainly convert NH-N to NO-N through microbial nitrification. The 3DBER removes the residual NO-N by bio-electrochemical denitrification. The integrated system can eliminate 74.72-83.27% of COD, 99.38-99.74% of NH-N, and 69.64-99.83% of total nitrogen from coking wastewater during the continuous operation, as well as significantly reducing the toxicity of the wastewater. The superiorities of the integrated 3DERs/BAFs/3DBER system recommend the application of such biological-electrocatalytic technology in the treatment of highly toxic wastewater.
焦化废水通常具有较强的抗生物降解性，主要归因于其生物毒性和复杂的成分。在本研究中，开发了一种由两个三维电化学反应器（3DER）、两个曝气生物滤池（BAF）和一个三维生物膜电极反应器（3DBER）组成的新型集成生物-电催化工艺，用于焦化废水的深度处理。3DER 去除了 73.21%的化学需氧量（COD）、38.02%的氨氮（NH-N）和 91.46%的硝态氮（NO-N）。BAFs 主要通过微生物硝化作用将 NH-N 转化为 NO-N。3DBER 通过生物电化学反硝化去除残留的 NO-N。在连续运行过程中，集成系统可以去除焦化废水中 74.72-83.27%的 COD、99.38-99.74%的 NH-N 和 69.64-99.83%的总氮，同时显著降低废水的毒性。集成的 3DERs/BAFs/3DBER 系统具有明显的优势，推荐将这种生物-电催化技术应用于高毒性废水的处理。
