A novel integrated system of three-dimensional electrochemical reactors (3DERs) and three-dimensional biofilm electrode reactors (3DBERs) for coking wastewater treatment. (July 2019)

• Record Type: Journal Article
• Authors: Wu, Zhen-yu; Liu, Yang; Wang, Si-yuan; Peng, Pin; Li, Xiu-yan; Xu, Juan; Li, Wei-hua
• Is Part Of: Bioresource technology. Volume 284(2019)
• Page Start: 222
• Page End: 230
• Publication Date: 2019-07
• Subjects: Coking wastewater -- Energy consumption -- Nitrogen -- Three-dimensional biofilm electrode reactors (3DBERs) -- Three-dimensional electrochemical reactors (3DERs); Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2019.03.123
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: An integrated 3DERs-3DBERs system was applied in coking wastewater treatment. 3DERs contributed to COD and nitrogen removal through electrochemical reactions. 3DBERs were responsible for nitrification process by enriching functional microbes. 79.63% of COD and 76.30% of TN was eliminated at energy consumption of 15.6 kWh/m 3 . Abstract: 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.