Pollutant removal by an integrated vertical-flow constructed wetland treating simulated river water by reoxygenation |
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| Authors: | SY Lu Y Xing J Liu XC Jin JT Qu |
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| Institution: | 1. Civil and Environmental Engineering School, Engineering and Technology Centre of Lake, State Environmental Protection Scientific Observation and Research Station for Lake Dongtinghu (SEPSORSLD), Research Centre of Lake Environment, State Environmental Protection Key Laboratory for Lake Pollution Control;2. State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, Chinalushy2000@163.com;4. Civil and Environmental Engineering School, University of Science and Technology Beijing, Beijing, China;5. State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, China;6. Civil and Environmental Engineering School, University of Science and Technology Beijing, Beijing, China;7. School of Environmental Science and Engineering, Shandong University, Jinan, China |
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| Abstract: | The effects and mechanism of chemical oxygen demand (COD), nitrogen, and phosphorus concentration removal by an integrated vertical-flow constructed wetland were studied in the wetland system during one inlet–outlet operating period, in two typical stages (each stage is connective 24 h, sampled once every 4 h). The concentration of ammonia decreased along the flow direction in the system, while levels of nitrate (NO3?-N) increased. In one operating period, total nitrogen (TN) concentration fell with rising operation time due to evacuative reoxygenation. The TN and NH3-N removal rates in the system were 26.6% and 97.5%, respectively. COD decreased rapidly in the early stages and more gradually in the direction of water flow of the wetland system. Average total phosphorus (TP) removal rate was 20.71%. TN and NO3?-N levels in water of the wetland had a tendency to decline gradually with increasing operation time. Ammonia concentrations displayed only a small variation with operation time. The results also indicated that the wetland was able to maintain its temperature. The oxygen content differed during the various operating stages and exerted a marked influence on COD, TP, and TN removal. |
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| Keywords: | integrated vertical-flow constructed wetland nitrogen removal phosphorus removal simulated river water zeolite |
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