Efficient azo dye wastewater treatment in a hybrid anaerobic reactor with a built-in integrated bioelectrochemical system and an aerobic biofilm reactor: Evaluation of the combined forms and reflux ratio

Min-Hua Cui; Thangavel Sangeetha; Lei Gao; Ai-Jie Wang

doi:10.1016/j.biortech.2019.122001

Efficient azo dye wastewater treatment in a hybrid anaerobic reactor with a built-in integrated bioelectrochemical system and an aerobic biofilm reactor: Evaluation of the combined forms and reflux ratio

Bioresour Technol. 2019 Nov:292:122001. doi: 10.1016/j.biortech.2019.122001. Epub 2019 Aug 13.

Authors

Min-Hua Cui¹, Thangavel Sangeetha², Lei Gao³, Ai-Jie Wang⁴

Affiliations

¹ Jiangsu Key Laboratory of Anaerobic Biotechnology, School of Environmental and Civil Engineering, Jiangnan University, Wuxi 214122, PR China; State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, PR China.
² Department of Energy and Refrigerating Air-Conditioning Engineering and Research Center of Energy Conservation for New Generation of Residential, Commercial, and Industrial Sectors, National Taipei University of Technology, Taipei 10608, Taiwan.
³ State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, PR China.
⁴ State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, PR China; Key Laboratory of Environmental Biotechnology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, PR China. Electronic address: waj0578@hit.edu.cn.

PMID: 31444121
DOI: 10.1016/j.biortech.2019.122001

Abstract

A combined process that consisted of a hybrid anaerobic reactor (HAR) with an integral bioelectrochemical system and aerobic biofilm reactor (ABFR) was established for simulated azo dye wastewater treatment (domestic wastewater containing dye acid orange 7). The split combination form that separated HAR and ABFR into two individual reactors recorded a decolorization efficiency of 81.23 ± 0.12%, which was about 8% higher than that HAR and ABFR were stacked together into a single up-flow reactor. Implementation of reflux improved the decolorization and chemical oxygen demand (COD) removal in both the processes. Decolorization efficiency achieved 97.52 ± 0.66% in split process at a reflux ratio of 1 and the COD was 89 ± 2 mg/L in the final effluent. Further increasing the reflux ratio to 3 did not have any significance in treatment performance of the reactors. This study comprehensively revealed the influence of combination forms and reflux ratio on the performance of combined process.

Keywords: Aerobic biofilm reactor; Azo dye wastewater; Combination form; Hybrid anaerobic reactor; Reflux ratio.

MeSH terms

Anaerobiosis
Azo Compounds
Biofilms
Bioreactors*
Coloring Agents
Waste Disposal, Fluid
Wastewater*

Substances

Azo Compounds
Coloring Agents
Waste Water