HULan-lan,SUNLi-li,LUYin,et al.Effect of COD Pretreatment on Urine Nitrogen Removal Efficiency of CPNA Process[J].China Water & Wastewater,2023,39(17):10-17.
Effect of COD Pretreatment on Urine Nitrogen Removal Efficiency of CPNA Process
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第39卷
Number:
第17期
Page:
10-17
Column:
Date of publication:
2023-09-01
- Keywords:
- urine; partial nitrification; anammox; COD/N ratio; nitrogen removal
- Abstract:
- The combined partial nitrification/anammox (CPNA) SBR process is suitable for in?situ nitrogen removal from source-separated urine. However, high concentration of organic matter may pose a potential risk to the long-term stable performance of the process. In order to avoid this problem, a simple pretreatment technology was employed to remove COD in urine, and its influence on the nitrogen removal via the CPNA-SBR process was evaluated. Part of COD in urine was successfully removed in advance through inoculating the SBR sludge which used the oxygen diffusing from the liquid-gas surface. Increasing the liquid-gas surface could accelerate the removal of COD. The pretreatment reduced the COD/N ratio in urine from 1.78-2.45 to about 0.81. When pretreated urine was used for reactor influent, the cycle time of SBR was reduced significantly by about 10%-45%, and the removal rate of total nitrogen increased slightly from 83% to 93%. Therefore, this simple pretreatment is suitable for the removal of COD in urine in advance, especially in decentralized on site nitrogen removal process for source? separated urine.
Last Update:
2023-09-01