Sludge Digester Liquors Treatment by Enhancing Denitrification with Internal Carbon Source
Separate treatment of reject water of digested sludge could reduce the nitrogen load of the wastewater treatment plant and improve the final effluent quality. In the biological treatment process, however, external organic carbon was always required for stable denitrification. In this study, a novel system using primary sludge as the electron donor was developed for nitrogen removal of reject water. In particular, post denitrification was accomplished by simultaneous primary sludge fermentation and nitrite reduction in a specific reactor. Effluent recycling to the nitrification reactor significantly improved nitrogen removal. TN removal efficiency was 88.1％ and effluent TN was 48.0 mg/L at steady conditions. Decrease of TN removal was observed was observed at a low temperature due to the incomplete nitrification process. The results indicated post denitrification process with addition of primary sludge can be a suitable biotechnology for nitrogen removal of reject water.
Denitrification fermentation nitrogen removal primary sludge reject water
L. Zhang S.J. Zhang C.C. Wu S.Y. Wang Y.Z. Peng
State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin Beijing Drainage Group Co. Ltd (BDG), Beijing, China Key Laboratory of Beijing Water Quality Science and Water Environment Recovery Engineering, China
国际会议
天津
英文
247-254
2011-11-12（万方平台首次上网日期，不代表论文的发表时间）