HE Qi-fan,WANG Jiang-kun,LIU Hui-min,et al.Nitrogen Removal Mechanism and Operating Condition Optimization of Sulfur Autotrophic and Wavy Subsurface Flow Constructed Wetland Process[J].China Water & Wastewater,2021,37(3 3):104-109.
Nitrogen Removal Mechanism and Operating Condition Optimization of Sulfur Autotrophic and Wavy Subsurface Flow Constructed Wetland Process
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第37卷
Number:
3 3
Page:
104-109
Column:
Date of publication:
2021-02-01
- Keywords:
- sulfur autotrophic denitrification; wavy subsurface flow constructed wetland; aeration gas to water ratio; hydraulic load; nitrogen removal mechanism; operating condition optimization
- Abstract:
- The effect of nitrogen removal in wastewater with low C/N ratio was investigated by combining sulfur autotrophic denitrification process with enhanced subsurface flow constructed wetland. It was shown that the nitrogen removal could be guaranteed in wavy subsurface flow constructed wetland with additional aeration device. When the ratio of aeration gas to water was 8 ∶1 and the hydraulic load was 0.8 m3/(m2·d), TN removal rate was (70±5)% and effluent TN was lower than 8 mg/L; NH4+-N removal rate maintained over 90% and effluent NH4+-N was lower than 3 mg/L; COD removal rate was (50±2)% and effluent COD was lower than 40 mg/L; and pH could maintain within 7-9. At the same time, the limestone filler had the effect of simultaneous phosphorus removal. The process was economical, efficient, and effective in nitrogen removal.
Last Update:
2021-02-01