Microelectrolysis-integrated constructed wetland with sponge iron filler to simultaneously enhance nitrogen and phosphorus removal

Xiaoxiao Hou; Linglong Chu; Yifei Wang; Xinshan Song; Yingying Liu; Dongpeng Li; Xiaoxiang Zhao

doi:10.1016/j.biortech.2023.129270

Microelectrolysis-integrated constructed wetland with sponge iron filler to simultaneously enhance nitrogen and phosphorus removal

Bioresour Technol. 2023 Sep:384:129270. doi: 10.1016/j.biortech.2023.129270. Epub 2023 Jun 7.

Authors

Xiaoxiao Hou¹, Linglong Chu², Yifei Wang³, Xinshan Song⁴, Yingying Liu⁵, Dongpeng Li⁶, Xiaoxiang Zhao⁷

Affiliations

¹ College of Environmental Science and Engineering, State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, Donghua University, Shanghai 201620, PR China. Electronic address: hxx19990315@163.com.
² College of Environmental Science and Engineering, State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, Donghua University, Shanghai 201620, PR China. Electronic address: 2191565@mail.dhu.edu.cn.
³ College of Environmental Science and Engineering, State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, Donghua University, Shanghai 201620, PR China. Electronic address: wyfdlzzg@163.com.
⁴ College of Environmental Science and Engineering, State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, Donghua University, Shanghai 201620, PR China. Electronic address: newmounation@dhu.edu.cn.
⁵ College of Environmental Science and Engineering, State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, Donghua University, Shanghai 201620, PR China. Electronic address: 15852920990@163.com.
⁶ College of Environmental Science and Engineering, State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, Donghua University, Shanghai 201620, PR China. Electronic address: lddest@163.com.
⁷ College of Environmental Science and Engineering, State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, Donghua University, Shanghai 201620, PR China. Electronic address: zxx@dhu.edu.cn.

PMID: 37290705
DOI: 10.1016/j.biortech.2023.129270

Abstract

Integrating sponge iron (SI) and microelectrolysis individually into constructed wetlands (CWs) to enhance nitrogen and phosphorus removal are challenged by ammonia (NH₄⁺-N) accumulation and limited total phosphorus (TP) removal efficiency, respectively. In this study, a microelectrolysis-assisted CW using SI as filler surrounding the cathode (e-SICW) was successfully established. Results indicated that e-SICW reduced NH₄⁺-N accumulation and intensified nitrate (NO₃^--N), the total nitrogen (TN) and TP removal. The concentration of NH₄⁺-N in the effluent from e-SICW was lower than that from SICW in the whole process with 39.2-53.2 % decrease, and as the influent NO₃^--N concentration of 15 mg/L and COD/N ratio of 3, the removal efficiencies of NO₃^--N, TN and TP in e-SICW achieved 95.7 ± 1.9 %, 79.8 ± 2.5 % and 98.0 ± 1.3 %, respectively. Microbial community analysis revealed that hydrogen autotrophic denitrifying bacteria of Hydrogenophaga was highly enriched in e-SICW.

Keywords: Constructed wetland; Microelectrolysis; Nitrogen removal; Phosphorus removal; Sponge iron.

MeSH terms

Denitrification
Iron
Nitrogen / analysis
Phosphorus / analysis
Waste Disposal, Fluid* / methods
Wetlands*

Substances

Nitrogen
Phosphorus
Iron