Change of Nitrogen Elements in Tail Water Diversion Project of Wastewater Treatment Plant
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第36卷
Number:
11
Page:
75-80
Column:
Date of publication:
2020-06-05
- Abstract:
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The tail water diversion project of wastewater treatment plant in Suqian is an important measure to ensure the water quality of the east route of South- to-North Water Transfer Project. However, the change rule of water quality in the transfer process is not clear, and its influence on the final effluent quality is also unknown. The change of effluent quality of eight wastewater treatment plants in the past three years were investigated. On the basis of defining the typical water quality problems, the wastewater diversion and transportation process was simulated by laboratory experiments. Then, effects of mixing time, initial concentration, temperature and initial biochemical ratio on total nitrogen, nitrate nitrogen and ammonia nitrogen in the transportation process were explored, and influence of nitrogen variation on water quality of the main outlet was finally determined. Mixing time, initial concentration and initial biochemical ratio had no significant effect on nitrogen concentration in effluent. Temperature had a significant influence on the change of ammonia nitrogen concentration, and the concentration of ammonia nitrogen decreased with the increase of temperature. The microbial community composition was analyzed by high-throughput sequencing. The diversity of wall-attached microorganisms increased with the transportation distance, and biodegradation of the functional bacteria was beneficial to the transformation and removal of nitrogen.
Last Update:
2020-06-01