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.
Process Design and Efficiency Analysis of Nitrogen and Phosphorus Removal in Two Phases of a Reclaimed Water Plant
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第40卷
Number:
第18期
Page:
64-70
Column:
Date of publication:
2024-09-17
- Keywords:
- reclaimed water plant; nitrogen and phosphorus removal; MSBR process; denitrification biological filter; high-efficiency air flotation; V?type filter; carbon emission
- 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.
Last Update:
2024-09-17