Biological nutrient removal in A<sup>2</sup>O process when treating low C/N ratio domestic wastewater

WU Changyong; PENG Yongzhen; PENG Yi

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Biological nutrient removal in A²O process when treating low C/N ratio domestic wastewater

更新时间：2025-12-10

- Biological nutrient removal in A²O process when treating low C/N ratio domestic wastewater
- CIESC Journal Issue 12, Pages: 3126-3131(2008)
- 作者机构：
  
  1. 哈尔滨工业大学城市水资源与水环境国家重点实验室,黑龙江,哈尔滨,150090
  2. 北京工业大学北京市水质科学与水环境恢复工程重点实验室,北京,100022
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- Online First：05 December 2008，
  
  Published：05 December 2008
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WU Changyong, PENG Yongzhen, PENG Yi. Biological nutrient removal in A²O process when treating low C/N ratio domestic wastewater[J]. CIESC Journal, 2008, (12): 3126-3131.
DOI：

WU Changyong, PENG Yongzhen, PENG Yi. Biological nutrient removal in A²O process when treating low C/N ratio domestic wastewater[J]. CIESC Journal, 2008, (12): 3126-3131. DOI：

摘要

采用52.5 L的A2O试验装置处理实际生活污水，研究了A2O工艺在处理低C/N比生活污水时的脱氮除磷特性，并探讨了如何通过强化缺氧吸磷来提高系统的脱氮除磷效率。试验结果表明：在厌氧/缺氧/好氧体积比为1/1/2、HRT为8 h、污泥回流比为70%、内回流比为300%的工况下处理C/N为7.89的生活污水，TN和SOP去除率分别能够达到85.4%和93.3%，系统中存在反硝化除磷，缺氧吸磷占总吸磷量的25.3%。同样的运行条件下处理C/N为4.20的生活污水时，SOP去除几乎不受影响，但TN去除率降低至62.2%，平均出水TN浓度也超过20 mg8226;L-1。维持厌氧区体积不变，增大缺氧区体积，使得缺氧/好氧体积比为5/8时，TN去除率可上升到70.7%，缺氧吸磷占总吸磷量的55.2%。同时改变内回流比的试验表明250%的内回流比能最大程度地强化反硝化除磷的作用，此时TN去除率可提高至77.3%。强化A2O工艺中的反硝化除磷，能克服碳源不足对脱氮除磷的影响，显著提高低C/N比污水的脱氮除磷效率。

Abstract

In order to investigate the performance of biological nutrients removal and denitrifying phosphorus removal in the A2O process when treating low C/N ratio domestic wastewater，a reactor，with a working volume of 52.5 L，was used in this study.The volume ratio of anaerobic/anoxic/aerobic zone was 1/1/2 and the major operating parameters were：HRT 8 h，sludge recycle ratio（r）70%，aerobic（nitrate）recycle ratio（R）300%.The results showed that 85.4% of TN and 93.3% of SOP could be removed when the C/N ratio was 7.89.There was denitrifying phosphorus removal in the system.Moreover，up to 25.3% of the SOP could be removed in the anoxic zone by this way.The TN removal efficiency was reduced to 62.2% when decreasing the C/N ratio to 4.20 with the same operating parameters.However，the SOP removal efficiency was kept over 96.0%.The TN removal efficiency was 70.7% and up to 55.2% of SOP was removed in the anoxic zone when changing the volume ratio of anoxic/aerobic to 5/8.With the same anoxic/aerobic ratio，when changing the aerobic（nitrate）recycle ratio to 250%，the maximal denitrifying phosphorus removal could be achieved，removing 77.3% of the TN from the system.Enhanced denitrifying phosphorus removal in the A2O process is an effective way to counteract the disadvantages of carbon shortage for biological nutrients removal.

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Biological nutrient removal in A2O process when treating low C/N ratio domestic wastewater

DOI：

摘要

Abstract

关键词

Keywords

references

Biological nutrient removal in A²O process when treating low C/N ratio domestic wastewater