QIYa-ling,DIJian-ying,LINJia,et al.Application of Biological Aerated Filter with Multi-mode Operation in Advanced Treatment of WWTP[J].China Water & Wastewater,2022,38(20):85-89.
Application of Biological Aerated Filter with Multi-mode Operation in Advanced Treatment of WWTP
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第38卷
Number:
第20期
Page:
85-89
Column:
Date of publication:
2022-10-17
- Keywords:
- advanced treatment; biological aerated filter; multi-mode operation; simultaneous nitrification and denitrification
- Abstract:
- The effluent discharge standard of a wastewater treatment plant (WWTP) in southern China had been raised from the first level A criteria in Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB 18918-2002) to level Ⅳ criteria in Environmental Quality Standards for Surface Water (GB 3838-2002) (except TN≤15 mg/L), thus the biological aerated filter (BAF) for removing COD, BOD5, TN and ammonia nitrogen, and magnetic coagulation sedimentation tank were built as the new advanced processing units. The three possible influent conditions including only ammonia nitrogen exceeded, only total nitrogen exceeded, both ammonia nitrogen and total nitrogen exceeded are considered in the design of BAF and each design condition has the corresponding influent and effluent quality and process design parameters. Based on the traditional BAF, the influent distribution mode, the carbon source dosage mode, effluent reflux mode and aeration system have been optimized and improved. Through flexible operation, the BAF can realize nitrification only, denitrification only, or simultaneous nitrification and denitrification, under the condition that the effluent quality indexes of the existing secondary biological treatment process do not exceed the design condition of the filter, which reduces the operation risk.
Last Update:
2022-10-17