Enhancing Infiltration System Via Iron-Carbon Micro-Electrolysis Combined With Electrochemical Intensification: Efficiency And Mechanisms Of Nitrogen And Phosphorus Removal.

Micro-electrolysis technology and electrochemistry both impact the process of nitrogen removal. However, previous research has mainly focused on their individual mechanisms. This study integrates both technologies and applies to a wetland system. An artificial constructed vertical flow wetland system that combines iron-carbon micro-electrolysis technology with electrochemical modification has been used for the experiment. The influent had a high carbon-to-nitrogen ratio: COD: 250 mg/L, NH3-N: 30 mg/L, TN: 130 mg/L, TP: 5 mg/L. The results showed that as the current intensity increased, the removal rates of COD, NH3-N, and TP all significantly increased, while the oxidation–reduction potential (ORP) significantly decreased. When the current intensity reached 40 mA, the removal rate of TN sharply decreased, even lower than the group without electrochemical enhancement. The optimal current intensity was found to be 20 mA, with a current density of 0.016 mA/cm2. At this level, the removal rates were 90% for COD, 92% for NH3-N, 37% for TP, and 85% for TN. Microbial community analysis further indicated that with increasing current intensity, the overall abundance of common denitrifying bacterial phyla in wastewater treatment, such as Proteobacteria, Firmicutes, and Bacteroidota, gradually increased. This suggests that electrochemical enhancement is beneficial for improving microbial community structure and promoting denitrification in wastewater.There are still many shortcomings in this study, and in the future, efforts can be made to establish a quantitative equation between the amount of influent carbon source and the optimal current density. [ABSTRACT FROM AUTHOR]

Copyright of Water, Air & Soil Pollution is the property of Springer Nature and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)