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Kinetics of Nutrient Removal by Nano Zero‐Valent Iron under Different Biochemical Environments
The effectiveness of nano zero‐valent iron (NZVI; an average size of 55 nm at a concentration of 200 mg Fe/L) in nutrient removal was determined under anaerobic, anoxic, and aerobic conditions. Compared to the rate of reduction of nitrate nitrogen (‐N) to ammoniacal nitrogen ( ‐N) by NZVI alone, the presence of activated sludge increased the rate of complete reduction by 300%. About 31% of ‐N was converted to ‐N through NZVI‐facilitated dissimilatory nitrate reduction to ammonium, while 56% of ‐N was removed by heterotrophic denitrification. The presence of sludge reduced the rates of phosphorus removal by NZVI, with the first‐order reaction rate constants of 0.06/hour, 0.42/hour, and 0.18/hour under anaerobic, anoxic, and aerobic conditions, respectively. The highest phosphorus removal efficiency (95%) by NZVI was observed under anoxic abiotic conditions, whereas the efficiency dropped to 31% under anaerobic biotic conditions, which was attributed to significant sludge‐facilitated NZVI agglomeration.
Kinetics of Nutrient Removal by Nano Zero‐Valent Iron under Different Biochemical Environments
The effectiveness of nano zero‐valent iron (NZVI; an average size of 55 nm at a concentration of 200 mg Fe/L) in nutrient removal was determined under anaerobic, anoxic, and aerobic conditions. Compared to the rate of reduction of nitrate nitrogen (‐N) to ammoniacal nitrogen ( ‐N) by NZVI alone, the presence of activated sludge increased the rate of complete reduction by 300%. About 31% of ‐N was converted to ‐N through NZVI‐facilitated dissimilatory nitrate reduction to ammonium, while 56% of ‐N was removed by heterotrophic denitrification. The presence of sludge reduced the rates of phosphorus removal by NZVI, with the first‐order reaction rate constants of 0.06/hour, 0.42/hour, and 0.18/hour under anaerobic, anoxic, and aerobic conditions, respectively. The highest phosphorus removal efficiency (95%) by NZVI was observed under anoxic abiotic conditions, whereas the efficiency dropped to 31% under anaerobic biotic conditions, which was attributed to significant sludge‐facilitated NZVI agglomeration.
Kinetics of Nutrient Removal by Nano Zero‐Valent Iron under Different Biochemical Environments
Xu, Shengnan (author) / Hu, Zhiqiang (author)
Water Environment Research ; 87 ; 483-490
2015-06-01
8 pages
Article (Journal)
Electronic Resource
English
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