WANGXu-feng,YANGTao,XUXiu-li,et al.Nitrogen Removal in Three?dimensional Electrode Biofilm Coupled with Sulfur Autotrophic Process：Influence of HRT and Sodium Bicarbonate[J].China Water & Wastewater,2024,40(17):31-35.
Nitrogen Removal in Three?dimensional Electrode Biofilm Coupled with Sulfur Autotrophic Process：Influence of HRT and Sodium Bicarbonate
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第40卷
Number:
第17期
Page:
31-35
Column:
Date of publication:
2024-09-01
- Keywords:
- groundwater; nitrate; three-dimensional electrode biofilm; sulfur autotrophic denitrification; HRT; NaHCO3 concentration
- Abstract:
- The three-dimensional electrode biofilm coupled with sulfur autotrophic process was used to remove nitrate in simulated groundwater, and the effects of HRT and influent sodium bicarbonate(NaHCO3) concentration on the denitrification characteristics were explored. When the temperature was 20-25 ℃, the influent NO3--N concentration was about 70 mg/L, the current intensity was 400 mA, and the influent pH was 7.0-7.5, the optimal HRT and influent NaHCO3 concentration of the reactor was 16.0 hours and 1.0 g/L respectively. The impact of HRT on the removal efficiency of NO3--N was significant. The removal rate of NO3--N decreased with the shortening of HRT, but it could maintain a relatively stable NO3--N removal load under various HRTs. The influent NaHCO3 concentration had a significant impact on the removal efficiency of NO3--N. The removal rate of NO3--N decreased sharply with the decrease of influent NaHCO3 concentration. Both HRT and influent NaHCO3 concentration could significantly affect the accumulation of NO2--N in the reactor. The accumulation of SO42- decreased with the shortening of HRT or the decreasing of NaHCO3 concentration in the influent. HRT could significantly affect the proportion of hydrogen autotrophic and sulfur autotrophic in the reactor, while the concentration of NaHCO3 in the influent had no significant effect on their proportions.
Last Update:
2024-09-01