KEShui-zhou,HUXiang,MAJing-wei,et al.Operation Optimization of Multi-stage Modified A2O Process for Nitrogen and Phosphorus Removal[J].China Water & Wastewater,2023,39(17):74-80.
多段改良A2O脱氮除磷工艺生产运行优化
- Title:
- Operation Optimization of Multi-stage Modified A2O Process for Nitrogen and Phosphorus Removal
- Keywords:
- modified A2O process; nitrogen and phosphorus removal; operation optimization; mass balance; sludge loading rate
- 摘要:
- 以湖南省长沙市花桥水质净化厂为例，运用正交试验的方法研究了混合液内回流比、污泥外回流比和四点进水比例（前置反硝化段∶厌氧段∶主缺氧段∶后置缺氧段）对二沉池出水的影响。结果表明，内外回流比和四点进水比例对TP和NH3-N去除率的影响较小，后置缺氧段和厌氧段进水比例对TN去除率的影响最大。借助系统物料衡算分析，发现主缺氧段去除硝态氮和亚硝态氮量占系统总去除量的70%~80%，后置缺氧段仅占10%~20%，借助进水碳源的合理分配，适当内回流可使系统脱氮效果最大化。经验证，当四点进水比例为15∶65∶15∶5、内回流比为100%、外回流比为50%左右时，TN去除率最高，达到67.82%，较对照组提升4.74%；当四点进水比例为20∶65∶15∶0、内回流比为50%、外回流比为40%左右时，试验组二沉池出水平均TP比对照组低0.093 mg/L。统计分析了不同季节污泥负荷与污染物去除率的关系，结果表明春夏季、秋冬季的最优污泥负荷（以COD计）分别为0.15和0.22 kg/（kgMLVSS·d），以此调节污泥浓度，可达到降本增效的目的。
- Abstract:
- This paper investigated the effects of internal reflux ratio of mixed liquid, sludge external reflux ratio and influent distribution ratio of pre-denitrification section, anaerobic section, main anoxic section and post-anoxic section on the effluent from secondary sedimentation tank of Huaqiao Water Quality Purification Plant in Changsha City, Hunan Province by orthogonal test. The internal and external reflux ratio and four-point influent distribution ratio had little influence on the removal rates of TP and NH3-N, while the influent distribution ratio of the post-anoxic section and anaerobic section had the greatest influence on the removal rate of TN. The mass balance analysis of the system indicated that the removal of nitrate nitrogen and nitrite nitrogen in the main anoxic section accounted for 70% to 80% of the total removal amount in the system, while the post-anoxic section accounted for only 10% to 20%. The rational distribution of influent carbon sources and appropriate internal reflux could maximize the nitrogen removal performance of the system. When the four-point influent distribution ratio was 15∶65∶15∶5, the internal reflux ratio was 100%, and the external reflux ratio was approximately 50%, the removal rate of TN reached the maximum of 67.82%, which was 4.74% higher than that of the control group. When the four-point influent distribution ratio was 20∶65∶15∶0, the internal reflux ratio was 50%, and the external reflux ratio was approximately 40%, the average TP in effluent from the secondary sedimentation tank in the experimental group was 0.093 mg/L lower than that in the control group. The relationship between the sludge loading rate and the pollutant removal rate in different seasons was statistically analyzed. The results showed that the optimal sludge loading rate calculated by COD was 0.15 kg/(kgMLVSS·d) in spring and summer, and 0.22 kg/(kgMLVSS·d) in autumn and winter, indicating that the purpose of reducing cost and increasing efficiency could be achieved by adjusting sludge concentration.
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