School of Environment and Energy Engineering, Anhui Jianzhu University, Hefei, China.
Shanghai Key Lab for Urban Ecological Processes and Eco-Restoration, Tiantong National Field Observation Station for Forest Ecosystem, School of Ecological and Environmental Sciences, East China Normal University, Shanghai, 200241, China.
J Environ Manage. 2020 Mar 15;258:110021. doi: 10.1016/j.jenvman.2019.110021. Epub 2020 Jan 6.
Coking wastewater is highly concentrated and extremely toxic, greatly challenging the treatment technologies. Conventional biological technology such as anaerobic-anoxic-oxic (AO) system is inefficient, since various biological reactions are inhibited by toxicants in coking wastewater. In this work, a pilot-scale three-dimensional electrochemical reactor (3DER) is integrated into the AO system as a pretreatment unit to improve the treatment efficiency of coking wastewater. The results indicate that 3DER pretreatment increased the biodegradability of coking wastewater, promoting the degradation of coking wastewater in AO system. The integrated 3DER-AO system can remove 94.4% of COD and 76.2% of TN from coking wastewater, and the energy consumption was only 0.22 kWh/kg COD and 4.69 kWh/kg TN. The components of coking wastewater were significantly simplified and the acute toxicity was reduced from 99% to 12% after the treatment. The integrated 3DER-AO system provides a new solution for coking wastewater treatment, showing a promising application potential.
焦化废水浓度高、毒性大，极大地挑战了处理技术。传统的生物技术，如厌氧-缺氧-好氧（AO）系统，效率低下，因为各种生物反应都受到焦化废水中有毒物质的抑制。在这项工作中，将中试规模的三维电化学反应器（3DER）集成到 AO 系统中作为预处理单元，以提高焦化废水的处理效率。结果表明，3DER 预处理提高了焦化废水的可生物降解性，促进了 AO 系统中焦化废水的降解。集成的 3DER-AO 系统可以去除焦化废水中 94.4%的 COD 和 76.2%的 TN，能耗仅为 0.22 kWh/kg COD 和 4.69 kWh/kg TN。处理后，焦化废水的成分显著简化，急性毒性从 99%降低到 12%。集成的 3DER-AO 系统为焦化废水处理提供了新的解决方案，具有广阔的应用前景。
