LIU Shi-hu,WANG Jia-le,ZHOU Jian.Effect of C/N Ratio on High-standard Nitrogen and Phosphorus Removal Efficiency of SBR with Short-time Aeration[J].China Water & Wastewater,2020,36(15):13-17.
C/N值对短时曝气SBR高标准脱氮除磷效能的影响
- Title:
- Effect of C/N Ratio on High-standard Nitrogen and Phosphorus Removal Efficiency of SBR with Short-time Aeration
- Keywords:
- sewage; SBR; short-time aeration; C/N ratio; high-standard nitrogen and phosphorus removal
- 摘要:
- 针对现有城镇污水脱氮除磷效率低、碳源对深度脱氮除磷制约等突出问题，提出了基于短时曝气SBR的城镇污水高标准脱氮除磷技术，考察了进水C/N值对短时曝气SBR脱氮除磷效能的影响。结果表明，进水C/N值对短时曝气SBR的脱氮除磷效能影响显著。当温度为25 ℃，SRT为40 d，进水C/N值分别为4、5、6、7时，系统对NH4+-N的平均去除率分别为83.3%、99.3%、99.4%、99.5%，对TN的平均去除率分别为58.8%、82.6%、88.1%、93.8%，对TP的平均去除率分别为14.6%、54.5%、76.6%、97.5%。当进水C/N值为7时，系统出水COD、NH4+、TN、TP平均浓度分别为18、0.20、2.46、0.13 mg/L，COD、NH4+-N与 TP指标满足地表水Ⅳ类水质标准，TN指标接近地表水Ⅴ类水质标准。
- Abstract:
- A series of problems existed in sewage treatment such as low nitrogen and phosphorus removal efficiency and shortness of carbon source. A high-standard nitrogen and phosphorus removal technology based on SBR with shorttime aeration was proposed for sewage treatment, and the effect of influent C/N ratio on nitrogen and phosphorus removal efficiency of the SBR system was investigated. Results showed that C/N ratio had a significant effect on the nitrogen and phosphorus removal efficiency of the SBR with shorttime aeration. When the temperature was 25 ℃, the SRT was 40 days and the influent C/N ratios were 4, 5, 6 and 7, the removal rates of NH4+-N were 83.3%, 99.3%, 99.4% and 99.5%, respectively, the removal rates of TN were 58.8%, 82.6%, 88.1% and 93.8%, respectively, and the removal rates of TP were 14.6%, 54.5%, 76.6% and 97.5%, respectively. When the influent C/N ratio was 7, the average concentrations of COD, NH4+-N, TN and TP in the effluent were 18 mg/L, 0.20 mg/L, 2.46 mg/L and 0.13 mg/L, respectively. The concentrations of COD, NH4+-N and TP in the effluent could meet the level Ⅳ standard of surface water, and the TN concentration in the effluent was close to the level Ⅴ standard of surface water.。
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