WANG Xiang,CHEN Tao,KONG De-fang,et al.Effect of Temperature on Denitrification of Sulfur Autotrophic Horizontal Subsurface Flow Constructed Wetland[J].China Water & Wastewater,2020,36(23):75-80.
温度对硫自养水平潜流人工湿地脱氮效果的影响
- Title:
- Effect of Temperature on Denitrification of Sulfur Autotrophic Horizontal Subsurface Flow Constructed Wetland
- Keywords:
- horizontal subsurface flow constructed wetland; sulfur autotrophic denitrification; wetland matrix combination; denitrification effect; microbial community
- 摘要:
- 反硝化作用是湿地脱氮的主要途径，低C/N值作为污水厂尾水的典型特征，限制了异养反硝化作用，硫自养反硝化与湿地技术相结合，可有效解决潜流湿地脱氮难的瓶颈。以污水厂尾水为研究对象，筛选适宜潜流湿地脱氮的功能基质，最终确定还原态硫-沸石-砾石的体积比为1 ∶1 ∶1时脱氮效果最佳，还原态硫的添加显著提升了潜流湿地的脱氮效果。此外，温度对硫自养潜流湿地脱氮效果的影响较大，在25~30、17~19 ℃条件下，硫自养潜流湿地脱氮率可达90%以上，11~13 ℃时脱氮率维持在80%左右，6~8 ℃时硫-石灰石-砾石湿地的脱氮率降至47%。在硫自养潜流湿地内共发现37个属，优势菌属中包括Thiobacillus、Sulfurimonas等硫自养反硝化菌属，硫自养反硝化菌的数量与系统反硝化速率呈正相关。
- Abstract:
- Denitrification is the main way of nitrogen removal in wetlands. A typical characteristic of low C/N ratio of wastewater treatment plant tail water restricts the effect of heterotrophic denitrification. However, the application of sulfur autotrophic denitrification technology to constructed wetlands can effectively solve the bottleneck of poor nitrogen removal efficiency in horizontal subsurface flow wetlands. Appropriate functional matrix for subsurface flow wetland denitrification was selected to treat tail water from a wastewater treatment plant, and the optimal denitrification performance was eventually obtained when the volume ratio of reduced sulfur, zeolite and gravel was 1 ∶1 ∶1. The addition of reduced sulfur could significantly improve the denitrification efficiency of the subsurface flow wetland. The temperature had great influence on denitrification efficiency of sulfur autotrophic subsurface flow wetlands. When temperatures were 25-30 ℃ and 17-19 ℃, nitrogen removal rate was above 90%, and about 80% at temperature of 11-13 ℃. However, the nitrogen removal efficiency of the wetlands with sulfur, limestone and gravel as matrix decreased to 47% at temperature of 6-8 ℃. Thirty-seven genera were discovered in sulfur autotrophic subsurface flow wetlands. The dominant sulfur autotrophic bacteria included Thiobacillus, Sulfurimonas and so on, and the number of sulfur autotrophic denitrifying bacteria was positively correlated with the denitrifying rate of the system.
相似文献/References:
[1]何启帆,王江坤,刘慧敏,等.硫自养波形潜流人工湿地的脱氮机理及工况优化[J].中国给水排水,2021,37(3):104.
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(23):104.
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