WANGYa-tong,ZHAOYuan,AIHeng-yu,et al.Nitrogen Removal Efficiency of Two Bio-photosensitive Material Coupled Systems under Low External Carbon Sources[J].China Water & Wastewater,2024,40(21):9-14.
Nitrogen Removal Efficiency of Two Bio-photosensitive Material Coupled Systems under Low External Carbon Sources
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第40卷
Number:
第21期
Page:
9-14
Column:
Date of publication:
2024-11-01
- Abstract:
- In order to reduce carbon emissions in the process of sewage treatment and explore a new way of low-carbon sewage treatment, a new electrochemically active denitrifying bacterium XJ2-7 was isolated and coupled with the photosensitive materials cadmium sulfide (CdS) and sodium anthraquinone-2-sulfonate (AQS) for denitrification with or without low external carbon sources. The results of sequential batch experiments showed that under the condition that there was no external carbon source in the light when the initial NO3--N concentration was 69.00 mg/L, the 24 hours total nitrogen removal rates of XJ2-7/CdS and XJ2-7/AQS were 40.40% and 52.03%, respectively. When the carbon source increased to a C/N ratio of 3.75, the total nitrogen removal rates of the two were 64.40% and 52.23%, respectively. Under the condition of low carbon source, ultraviolet light irradiation could increase the total nitrogen removal rate of the two systems by 13.72% and 11.62%, respectively. Under the conditions of low carbon source and ultraviolet irradiation, sodium lactate could increase the denitrification rates of the two systems by 14.48% and 8.91%, respectively. It is speculated that the electron transfer pathway of strain XJ2-7 using photogenerated electrons for extracellular respiration under the condition of no carbon source depends on cytochrome C to capture electrons and transfer them to electron acceptors, or to release electrons to the cell through capacitive H?AQS.
Last Update:
2024-11-01