WANGFan,LIJun,AISheng-shu,et al.Effect of Hydraulic Retention Time on Multistage A/O Coupled with Flow-separated Biochemical Process for Nitrogen Removal from Wastewater at Low Temperature[J].China Water & Wastewater,2022,38(17):74-80.
Effect of Hydraulic Retention Time on Multistage A/O Coupled with Flow-separated Biochemical Process for Nitrogen Removal from Wastewater at Low Temperature
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第38卷
Number:
第17期
Page:
74-80
Column:
Date of publication:
2022-09-01
- Keywords:
- HRT; multistage A/O process; low temperature; nitrogen removal; simultaneous nitrification and denitrification; biofilm
- Abstract:
- The effect of hydraulic retention time (HRT) on three-stage A/O coupled with flow-separated biochemical process for nitrogen removal at low temperature was explored. The performances of the process operated with HRT of 12 h, 8 h and 6 h were investigated respectively, and other operational conditions were as follows: flow-separated ball as the biofilm carrier, temperature of (10±1) ℃, influent flow distribution ratio of 25∶15∶6, total aeration rate of 6 L/min, sludge retention time of 43 days and sludge reflux ratio of 50%. When HRT was 8 h, the denitrification performance was the best, and the average removal rates of COD, NH4+-N and TN were 84.98%, 92.03% and 68.52%, respectively. The denitrification performances of different stage biochemical systems indicated that nitrification was the key factor restricting high-efficiency denitrification of the coupling process at low-temperature when HRT was 6 h. HRT of 12 h was not conducive to the improvement of microbial activity, and the TN removal rate was low and unstable. The paper enriches the theory of nitrogen removal in multistage A/O coupling processes at low temperature, and can provide reference for engineering design and application.
Last Update:
2022-09-01