期刊
BIORESOURCE TECHNOLOGY
卷 284, 期 -, 页码 222-230出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2019.03.123
关键词
Coking wastewater; Energy consumption; Nitrogen; Three-dimensional biofilm electrode reactors (3DBERs); Three-dimensional electrochemical reactors (3DERs)
资金
- National Natural Science Foundation of China [51708224]
- Shandong Key Laboratory of Water Pollution Control and Resource Reuse [2019KF04]
Treatment of coking wastewater is a great challenge due to their instinct characteristics of high concentration, complex composition and biological toxicity. In this work, a novel integrated system comprising three-dimensional electrochemical reactors (3DERs) and three-dimensional biofilm electrode reactors (3DBERs) in series is developed for coking wastewater treatment. Results indicate that 79.63% of COD as well as 76.30% of total nitrogen could be removed at the low energy consumption of 15.6 kWh/m(3). 3DERs mainly contribute to COD and nitrogen removal through electrochemical oxidation/reduction, while 3DBERs are responsible for nitrification process by enriched functional microbes. After treating by the integrated system, only long-chain alkanes are left in the wastewater and the toxicity of effluent is significantly reduced. This integrated 3DERs-3DBERs system exhibits capability of simultaneously eliminating carbonaceous and nitrogenous contaminants in coking wastewater, and greatly saves the energy with synergy of electricity and biofilm.
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