ZENGChao,LIUYing,CHENYuan,et al.Process Design and Efficiency Analysis of Nitrogen and Phosphorus Removal in Two Phases of a Reclaimed Water Plant[J].China Water & Wastewater,2024,40(18):64-70.
某再生水厂两期脱氮除磷工艺设计及效能分析
- Title:
- Process Design and Efficiency Analysis of Nitrogen and Phosphorus Removal in Two Phases of a Reclaimed Water Plant
- Keywords:
- reclaimed water plant; nitrogen and phosphorus removal; MSBR process; denitrification biological filter; high-efficiency air flotation; V?type filter; carbon emission
- 摘要:
- 某再生水厂一期采用“7池型MSBR+反硝化生物滤池+高效气浮”工艺，二期采用“10池型MSBR+深度脱氮V型滤池”工艺，设计出水水质均要求达到地表水准Ⅳ类标准（TN≤10 mg/L）。根据2022年1月—2023年7月的运营数据，一期平均出水TN为6.50 mg/L，TP为0.16 mg/L，平均吨水电耗为0.236 kW·h/m3，浓度为10%的液体PAC用量为28.97 mg/L，浓度为20%的液体碳源乙酸钠用量为63.17 mg/L，运行时的平均单位污染物碳排放强度为（4.59±0.98） kgCO2-eq/kg，吨水碳排放为（0.319±0.075） kgCO2-eq/m3；二期平均出水TN为5.37 mg/L，TP为0.19 mg/L，平均吨水电耗为0.273 kW·h/m3，浓度为10%的液体PAC用量为42.99 mg/L，浓度为20%的液体碳源乙酸钠用量为21.98 mg/L，运行时的平均单位污染物碳排放强度为（4.75±0.67） kgCO2-eq/kg，吨水碳排放为（0.328±0.050） kgCO2-eq/m3。
- Abstract:
- A reclaimed water plant adopts the process of 7-tank MSBR, denitrification biological filter and high-efficiency air flotation in phase I, and the process of 10-tank MSBR, deep denitrification V-type filter in phase Ⅱ. The design effluent quality is required to meet level quasi-Ⅳ criteria of Environmental Quality Standard for Surface Water (GB 3838-2002) , i.e., TN≤10 mg/L. According to relevant operation data from January 2022 to July 2023 in phase Ⅰ, the average effluent TN and TP were 6.50 mg/L and 0.16 mg/L, respectively. The corresponding average unit power consumption was 0.236 kW·h/m3, the dosage of 10% content liquid PAC was 28.97 mg/L, and the dosage of 20% content liquid carbon source sodium acetate was 63.17 mg/L. The average carbon emission intensity per unit pollutant during operation was (4.59±0.98) kgCO2-eq/kg,and the average carbon emission in tensity per ton of wastewater was (0.319±0.075) kgCO2-eq/m3. In phase Ⅱ, the average effluent TN was 5.37 mg/L, TP was 0.19 mg/L, the average unit power consumption was 0.273 kW·h/m3, the dosage of 10% content liquid PAC was 42.99 mg/L, and the dosage of 20% content liquid carbon source sodium acetate was 21.98 mg/L.The average unit carbon emission intensity was (4.75±0.67) kgCO2-eq/kg,and the average carbon emission in tensity per ton of wastewater was (0.328±0.050) kgCO2-eq/m3.
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