SHENGLiang,HUDuoyun,HUDan,et al.Pilot-scale Study on Performance Enhancement of BAF Operation under Low-temperature Conditions[J].China Water & Wastewater,2026,42(11):66-71.
低温条件下BAF运行效能提升中试
- Title:
- Pilot-scale Study on Performance Enhancement of BAF Operation under Low-temperature Conditions
- Keywords:
- biological aerated filter; low-temperature; domestic wastewater; nitrogen removal; carbon-to-nitrogen ratio; air-to-water ratio
- 摘要:
- 针对汤逊湖污水处理厂三期曝气生物滤池（BAF）在冬季运行效能不佳的问题，搭建了三组平行的BAF中试装置，在低温（16~18 ℃）条件下，考察了碳源种类及投加量、气水比和碱度等关键工艺参数对脱氮效能的影响。结果表明，复合碳源（主要成分为乙醇，另含少量甲醇等物质）的效果优于乙酸钠，其碳氮比控制在6时处理效果最佳。当气水比为4以及补充2倍碱度时，总氮和氨氮去除率分别达到72.61%和92.97%。因此，正确的碳源选择、合理的碳氮比调控、优化的气水比设定以及充足的碱度补充，可显著提升BAF系统的反硝化效率和硝化稳定性。
- Abstract:
- To address the issue of poor performance in the biological aerated filter (BAF) of the third phase at the Tangxun Lake Wastewater Treatment Plant under low-temperature winter conditions, this study established three parallel pilot-scale BAF units to systematically investigate the impacts of key operational parameters including carbon source type, carbon source dosage, air-to-water ratio, and alkalinity on nitrogen removal efficiency during winter. The results demonstrated that a composite carbon source which was primarily composed of ethanol with trace amounts of other substances such as methanol outperformed sodium acetate, with optimal treatment efficacy achieved at a controlled C/N ratio of 6, and under this condition, an air-to-water ratio of 4 coupled with supplementation of two times the alkalinity enabled total nitrogen (TN) and ammonia nitrogen (NH4+-N) removal efficiencies to reach 72.61% and 92.97%, respectively.Therefore, correct carbon source selection, reasonable carbon-to-nitrogen ratio regulation, optimized air-to-water ratio setting, and sufficient alkalinity supplementation can significantly improve the denitrification efficiency and nitrification stability of BAF systems.
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