YINJiang,JIANGJian-hong,TANGQing-chang,et al.Nitrogen Migration and Transformation in Process of Restaurant Waste Digestion Wastewater Treatment[J].China Water & Wastewater,2022,38(15):98-103.
Nitrogen Migration and Transformation in Process of Restaurant Waste Digestion Wastewater Treatment
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第38卷
Number:
第15期
Page:
98-103
Column:
Date of publication:
2022-08-01
- Keywords:
- restaurant waste digestion wastewater; Fenton process; dissolved organic nitrogen; fluorescence characteristics; biological treatment process
- Abstract:
- A combined system of anaerobic/oxic activated sludge process (A/O), Fenton process and biological aerated filter (BAF) was employed to treat high concentration restaurant waste digestion wastewater. The degradation and transformation of TN, NH4+-N, NO3--N and dissolved organic nitrogen (DON) in each process unit were analyzed, and the changes of molecular weight of DON, amino acid and fluorescence spectrum of organic matter along the process were investigated. Microorganisms were capable of metabolizing both inorganic and organic nitrogen. When the carbon source was sufficient in A/O process, microorganisms transformed inorganic nitrogen into nutrients needed for life activities by using carbon source, so as to reduce the concentration of inorganic nitrogen in the water. When the carbon source was insufficient in BAF, the transformation efficiency of inorganic nitrogen decreased, whereas the transformation of organic nitrogen was not affected. The transformation of organic nitrogen was related to the concentration of microorganism. However, it had little relationship with dissolved oxygen (DO) and carbon source. Fluorescence spectra and molecular weight analysis showed that large molecular nitrogen-containing organic compounds were transformed into small molecular substances after Fenton reaction, and thus be removed by the subsequent BAF process. NO3--N and DON in effluent from the combined process accounted for 92.5% and 6% of the effluent TN, respectively. Microbial metabolites increased the proportion of large molecular organic compounds in effluent DON. The amino acid concentration in wastewater changed significantly along the process, which was related to the metabolic activities of microorganisms in the biological treatment process.
Last Update:
2022-08-01