ZHOUYa-liang,ZHOUZan-min,YUZhi-da,et al.Optimization of Phosphorus and Nitrogen Removal Process with Low Organic Pollutant Concentration[J].China Water & Wastewater,2022,38(24):102-107.
低有机物浓度下的除磷脱氮工艺优化调控研究
- Title:
- Optimization of Phosphorus and Nitrogen Removal Process with Low Organic Pollutant Concentration
- Keywords:
- low organic pollutant concentration; nitrogen and phosphorus removal; process optimization; whole process analysis
- 摘要:
- 南方某污水处理厂提标改造后，总氮、总磷的排放限值由原来的20、1 mg/L分别降至15、0.5 mg/L，在雨季，由于进水有机物浓度较低（BOD5为50~60 mg/L），BOD5/TN 值80%概率在4以下波动，导致生物脱氮过程碳源不足，出水TN面临较大的达标压力。该厂通过开展工艺全流程分析，结合研究结果和生产实际，改变工艺运行模式，将改良A2/O氧化沟工艺灵活调整成AO工艺，同时通过及时监测进、出水正磷酸盐浓度变化，科学调整聚合氯化铝投加量，在雨季进水BOD5/TN值为2~3的类似条件下，出水TN浓度降低约36%，总磷稳定控制在0.3 mg/L以下，在确保出水水质稳定达标的同时，节约碳源成本约270万元/a。
- Abstract:
- After upgrading, the discharge limits of total nitrogen and phosphorus were reduced from 20 mg/L and 1 mg/L to 15 mg/L and 0.5 mg/L, respectively, in a municipal wastewater treatment plant (WWTP) in South China. In the rainy season, the low influent organic concentration (BOD5 is 50-60 mg/L) and the fluctuation of BOD5/TN ratio below 4 in 80% cases result in the lack of carbon source in the process of biological nitrogen removal and the greater pressure of effluent total nitrogen to meet the standard. By whole process analysis according to the research result and practice, the process operation mode is changed from the improved A2/O oxidation ditch to AO mode flexibly. At the same time, by monitoring influent and effluent orthophosphate concentration timely and adjusting the dosage of PAC reasonably, when the influent BOD5/TN ratio is at 2-3 analogously, the total effluent nitrogen concentration decreased by about 36%, and the total phosphorus was stably controlled below 0.3 mg/L. The control effect is good and stable, thus the annual carbon source cost is saved by about 2.70 million yuan/a.
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