WANGHong-wei,ZHANGGuo-zhen,WU Fu-ping,et al.Two?stage A/O Biofilter Combined with Micro-flocculation Filtration for Secondary Effluent Treatment[J].China Water & Wastewater,2022,38(5):65-69.
Two?stage A/O Biofilter Combined with Micro-flocculation Filtration for Secondary Effluent Treatment
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第38卷
Number:
第5期
Page:
65-69
Column:
Date of publication:
2022-03-01
- Keywords:
- two-stage A/O biofilter; micro-flocculation; secondary effluent; low carbon-nitrogen ratio; nitrogen and phosphorus removal
- Abstract:
- A combined process of two-stage A/O biofilter and micro-flocculation filtration was applied to treat the secondary effluent with low C/N ratio from a municipal wastewater treatment plant in Northwest China, and the enhanced performance of nitrogen and phosphorus removal was investigated. After biofilm formation, when dissolved oxygen, hydraulic load and flow distribution ratio were 4 mg/L, 1.2 m3/(m2·h) and 70%∶30%, the average removal efficiencies of COD and NH4+-N were 85% and 94%, respectively, and their average concentrations in the effluent were 19.86 mg/L and 0.48 mg/L, respectively, which met the class Ⅲ criteria specified in Environmental Quality Standards for Surface Water (GB 3838-2002). The removal efficiency of TP was 75%, and its average concentration in the effluent was 0.22 mg/L, which met the class Ⅳ criteria specified in GB 3838-2002. The removal efficiency of TN was 72%, and its average concentration in the effluent was 6.77 mg/L, which was much lower than the first level A criteria specified in the Dischange Standard of Pollutants for Municipal Wastewater Treatment Plant (GB 18918-2002). The combined process not only achieved a good COD removal performance but also realized nitrogen and phosphorus removal.
Last Update:
2022-03-01