Fate of dissolved organic nitrogen during biological nutrient removal wastewater treatment processes.
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Date
2013-04
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Abstract
Due to its potential to form toxic nitrogenous disinfection byproducts (N-DBPs), dissolved organic nitrogen (DON) is considered as one of the most important parameters in wastewater treatment plants (WWTP). This study describes a comprehensive investigation of variations in DON levels in orbal oxidation ditches. The results showed that DON increased gradually from 0.71 to 1.14 mg l-1 along anaerobic zone, anoxic zone, aerobic zone 1 and aerobic 2. Molecular weight fractionation of DON in one anaerobic zone and one aerobic zone (aerobic zone 2) was performed. We found that the proportion of small molecular weight (<6 kDa) decreased and large molecular weight (>20 kDa) showed opposite trend. This variation may have been caused due to the release of different types of soluble microbial products (SMPs) during biological processes. These SMPs contained both tryptophan protein-like and aromatic protein-like substances, which were confirmed by three-dimensional excitation-emission matrix (EEM) analysis.
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Keywords
Wastewater treatment plant, Dissolved organic nitrogen, Soluble microbial products, Orbal oxidation ditch
Citation
Liu Bing, Lin Huirong, Yu Guozhong, Zhang Shenghua, Yu Xin, Zhao Chengmei. Fate of dissolved organic nitrogen during biological nutrient removal wastewater treatment processes. Journal of Environmental Biology. 2013 Apr; 34(2suppl): 325-330.