PANLiu-qing,WUQiao-xin,GONGZhi-han,et al.Photoelectrochemical Characteristics of Activated Sludge and Its Potential for Photoelectrochemical Denitrification[J].China Water & Wastewater,2024,40(15):61-66.
Photoelectrochemical Characteristics of Activated Sludge and Its Potential for Photoelectrochemical Denitrification
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第40卷
Number:
第15期
Page:
61-66
Column:
Date of publication:
2024-08-01
- Keywords:
- activated sludge; illumination; denitrification; EPS; photogenerated current
- Abstract:
- To gain a deeper understanding of the photoelectrochemical characteristics of activated sludge and its potential for photoelectrochemical denitrification, this paper conducted an analysis on the variations in photogenerated current of activated sludge under different light intensities, as well as the response of denitrification activity under conditions with or without carbon source and illumination. Furthermore, the photoelectrochemical denitrification capability of activated sludge was further examined through a two-chamber photoelectrochemical denitrification test, while extracellular polymeric substances (EPS) and soluble microbial products (SMP) were analyzed using excitation-emission matrix (EEM) spectroscopy. The activated sludge exhibited photoelectrochemical characteristics, and its ability to generate photocurrent was positively associated with the irradiation intensity. Under carbon source conditions, the photoelectrochemical denitrification rate reached 1.470 mg/(gVSS·h), which was significantly higher than that in the groups without both carbon source and illumination [0.093 mg/(gVSS·h)], without carbon source but with illumination [0.201 mg/(gVSS·h)], and with carbon source but without illumination [1.018 mg/(gVSS·h)]. EPS and SMP were identified as photosensitive substances in the two- chamber photoelectrochemical denitrification device, with their primary components being tryptophan, tyrosine protein, and humic acid. This finding confirmed the photoelectrochemical denitrification capability of activated sludge.
Last Update:
2024-08-01