GAOSong,HEWei,XUWei,et al.Demonstration for Application of Denitrifying Phosphorus Removal Process in Rural Domestic Sewage Treatment[J].China Water & Wastewater,2023,39(14):114-119.
反硝化除磷工艺处理农村生活污水的工程实践
- Title:
- Demonstration for Application of Denitrifying Phosphorus Removal Process in Rural Domestic Sewage Treatment
- Keywords:
- ural domestic sewage; nitrogen and phosphorus removal; SBR; double sludge denitrifying phosphorus removal; biological contact oxidation; utilization of carbon source
- 摘要:
- 农村生活污水C/N低，限制了传统生物脱氮除磷工艺的处理效果，实际运行时往往需投加大量碳源，导致处理成本增加。反硝化除磷技术在处理低C/N生活污水方面具有突出的技术优势，但现有反硝化除磷工艺流程较为复杂，难以在农村地区应用。针对这一问题，联合SBR与生物接触氧化（BCO）工艺，设计了一种结构简单、自动化程度高、可调控性强的反硝化除磷工艺，并在常州某地开展了该工艺处理农村生活污水的工程实践。设置SBR厌氧段、缺氧段、好氧段反应时间分别为3、3、1 h，BCO的水力停留时间为4.6 h。实际运行结果表明，该工艺对COD、NH4+-N、TN、TP的平均去除率分别为83.0%、92.5%、60.5%、85.1%，出水水质满足《城镇污水处理厂污染物排放标准》（GB 18918—2002）的一级A标准。
- Abstract:
- The low-C/N ratio of rural domestic sewage limits the treatment effect of traditional biological nitrogen and phosphorus removal process. In actual operation, a large amount of carbon sources are often added, which leads to an increase in treatment cost. Denitrifying phosphorus removal technology has outstanding technical advantages in the treatment of low C/N domestic sewage, but the existing denitrification phosphorus removal processes are difficult to be applied in rural areas due to their complexity. To solve this problem, a denitrifying phosphorus removal process with simple structure, high degree of automation and good controllability was designed by combining SBR and biological contact oxidation (BCO), and applied in rural domestic sewage treatment engineering located in a village of Changzhou. The reaction time of anaerobic stage, anoxic stage and aeration stage of SBR was 3 h, 3 h and 1 h respectively, and the hydraulic retention time of BCO unit was 4.6 h. The operation results show that this process was effective on contaminants removals, with the average removal rates of COD, NH4+-N, TN and TP being 83.0%, 92.5%, 60.5% and 85.1%, respectively. The water quality of the effluent met first level A criteria specified in the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant ( GB 18918-2002).
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