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):104-109.
硫自养波形潜流人工湿地的脱氮机理及工况优化
- Title:
- Nitrogen Removal Mechanism and Operating Condition Optimization of Sulfur Autotrophic and Wavy Subsurface Flow Constructed Wetland Process
- Keywords:
- sulfur autotrophic denitrification; wavy subsurface flow constructed wetland; aeration gas to water ratio; hydraulic load; nitrogen removal mechanism; operating condition optimization
- 摘要:
- 将硫自养反硝化工艺与潜流人工湿地相结合，考察了其对低碳氮比污水中氮的去除效果。结果表明，增加曝气装置后硫自养波形潜流人工湿地的脱氮效果可以得到保障，在气水比为8 ∶1、水力负荷为0.8 m3/(m2·d)时，TN去除率为(70±5)%，出水TN浓度低于8 mg/L；NH4+-N去除率在90%以上，出水NH4+-N浓度低于3 mg/L；COD去除率为(50±2)%，出水COD浓度低于40 mg/L；pH值可维持在7～9。同时，石灰石填料具有同步除磷的效果。该工艺具有脱氮效率高、效果好、运行费用低的特点。
- 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.
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