Integrating electrochemical pre-treatment with carrier-based membrane bioreactor for efficient treatment of municipal waste transfer stations leachate

Zi Song; Feiyun Sun; Dingyu Xing; Runfeng Liao; Xinbo Zhang; Mingming Wang; Xiaoli Su; Zheng Wen; Wenyi Dong

doi:10.1016/j.biortech.2023.129003

Integrating electrochemical pre-treatment with carrier-based membrane bioreactor for efficient treatment of municipal waste transfer stations leachate

Bioresour Technol. 2023 Jul:379:129003. doi: 10.1016/j.biortech.2023.129003. Epub 2023 Apr 3.

Authors

Zi Song¹, Feiyun Sun², Dingyu Xing³, Runfeng Liao⁴, Xinbo Zhang⁴, Mingming Wang¹, Xiaoli Su¹, Zheng Wen¹, Wenyi Dong⁵

Affiliations

¹ State Key Laboratory of Urban Water Resource and Environment, Shenzhen Key Laboratory of Water Resource Utilization and Environmental Pollution Control, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China.
² State Key Laboratory of Urban Water Resource and Environment, Shenzhen Key Laboratory of Water Resource Utilization and Environmental Pollution Control, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China; State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China.
³ State Key Laboratory of Urban Water Resource and Environment, Shenzhen Key Laboratory of Water Resource Utilization and Environmental Pollution Control, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China; Joint Laboratory of Urban High Strength Wastewater Treatment and Resource Utilization, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China. Electronic address: xingdingyu@hit.edu.cn.
⁴ Joint Research Centre for Protective Infrastructure Technology and Environmental Green Bioprocess, Department of Environmental and Municipal Engineering, Tianjin Chengjian University, Tianjin 300384, China.
⁵ State Key Laboratory of Urban Water Resource and Environment, Shenzhen Key Laboratory of Water Resource Utilization and Environmental Pollution Control, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China; State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China; Joint Laboratory of Urban High Strength Wastewater Treatment and Resource Utilization, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China.

PMID: 37019412
DOI: 10.1016/j.biortech.2023.129003

Abstract

An integrated process of electrochemical pre-treatment with carrier-based membrane bioreactor (MBR) was constructed for fresh leachate from waste transfer stations with high organic and NH₄⁺-N content. Results showed that within a hydraulic retention time 40 h, the removal efficiencies of chemical oxygen demand (COD), NH₄⁺-N, suspended solids (SS) and total phosphorus (TP) were over 98.5%, 91.2%, 98.3% and 98.4%, respectively, with the organic removal rate of 18.7 kg/m³. The effluent met the Grade A Standard of China (GB/T31962-2015). Pre-treatment contributed about 70 % of the degraded refractory organics and almost all the SS, with the transformation of the humic-like acid to readily biodegradable organics. Biotreatment further removed over 50% of nitrogen pollutants through simultaneous nitrification and denitrification (SND) and consumed about 30% of organics. Meanwhile, the addition of carriers in the oxic MBR enhanced the attached biomass and denitrification enzyme activity, alleviating membrane fouling.

Keywords: Biological post-treatment; Fresh leachate; Integrated process; Physicochemical pre-treatment; Simultaneous nitrification and denitrification.

MeSH terms

Biological Oxygen Demand Analysis
Bioreactors*
Nitrification*
Nitrogen / chemistry
Phosphorus

Substances

Nitrogen
Phosphorus