YANG Chang-ming,YANG Yang,WANG Yu-lai.Forms of Nitrogen and Phosphorus and Spectral Characteristics in Effluent from Municipal Wastewater Treatment Plants[J].China Water & Wastewater,2021,37(3 3):1-8.
Forms of Nitrogen and Phosphorus and Spectral Characteristics in Effluent from Municipal Wastewater Treatment Plants
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第37卷
Number:
3 3
Page:
1-8
Column:
Date of publication:
2021-02-01
- Keywords:
- effluent of WWTPs; forms of nitrogen; forms of phosphorus; DOM; three-dimensional fluorescence spectroscopy
- Abstract:
- In order to further explore the potential impact of effluent on the water environment, seven municipal wastewater treatment plants (WWTPs) with three typical treatment processes (oxidation ditch process, SBR process and A2/O process) in Chaohu Lake basin were selected as the research object and the form of nitrogen and phosphorus and dissolved organic matter (DOM) spectral characteristics in the effluent were investigated. The results indicated that the WWTPs showed excellent removal effect of basic water quality indicators (TN, TP and COD), but there were no significant differences in removal performance among the three treatment processes. Dissolved total nitrogen (DTN) was the main form of nitrogen in the effluent, and particle nitrogen (PN) accounted for less than 13.4%. The proportion of dissolved inorganic nitrogen (DIN) was higher than that of dissolved organic nitrogen (DON). The proportion of particle phosphorus (PP) in tail water was 10.1%-66.7%, and phosphorus mainly existed in the form of dissolved total phosphorus(DTP), among which dissolved inorganic phosphorus (DIP) accounts for the largest proportion (more than 60%). By analyzing the three-dimensional fluorescence spectroscopy of DOM, it was found that different processes had four kinds of fluorescence characteristic peaks, and the humic acid group (C peak) and the ultraviolet group ferric acid group (A peak) were more obvious. According to the fluorescence characteristic parameters of DOM (HIX value < 4, FI value >1.9, BIX value > 1.0), the main source of DOM in the effluent from investigated WWTPs was the selfgenerated source. The above results indicate that the WWTPs have reduced a large number of carbon, nitrogen, phosphorus and other biogenic elements load into the river, and their effluent can be used as ecological water supply source of urban rivers to realize the recycling of urban sewage resources.
Last Update:
2021-02-01