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Effect of Artificial Aeration, Temperature, and Structure on Nutrient Removal in Constructed Floating Islands
Author(s) -
Dunqiu Wang,
Shaoyuan Bai,
Mingyu Wang,
Qinglin Xie,
Yinian Zhu,
Hua Zhang
Publication year - 2012
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143012x13347678384684
Subject(s) - aeration , eutrophication , nutrient , phosphorus , environmental engineering , hydraulic retention time , chemistry , environmental science , environmental chemistry , pulp and paper industry , zoology , wastewater , biology , engineering , organic chemistry
To study the optimal performance characteristics and maximize the removal efficiency of contaminants by the constructed floating islands (CFIs), four kinds of parallel pilot‐scale CFIs with different structures were set up outdoors to treat eutrophic water for approximately 6 months. The contribution of artificial aeration to nutrient removal on the basis of gas‐water ratios was investigated, and the influences of the structure and temperature were evaluated simultaneously. It was noted that the nutrient removal rate of the multi‐medium CFI was greater than those of others. In the four kinds of units, aeration could significantly increase the nutrient removal efficiency, and a gas‐water ratio of 10 was adequate for the relatively high removal of nutrients. Using the aforementioned gas‐water ratio of 10 and a hydraulic residence time (HRT) of 2 days, the mean removal efficiencies of the multi‐medium CFI for NH 3 ‐N and total phosphorus were 71.7% and 63.6%, respectively—approximately twice as great as those in the non‐aerated system. Furthermore, temperature was an important factor for nutrient removal in the multi‐medium CFI. With the water temperature of >13 °C and the HRT of 2.5 days, the mean removal efficiencies for NH 3 ‐N and total phosphorus were 87.6% and 83.5%, respectively, whereas the removal efficiency decreased significantly when the temperature was lower than 13°C.