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| A Comparative Study on Nitrogen Removal from Polluted Water by Floating Beds Planted with Phragmites australis and Acorus calamus |
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| KeyWord:eutrophication; nitrogen; purification capacity; Phragmites australis; Acorus calamus |
| Author Name | Affiliation | | DENG Zhi-qiang | Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China
University of Chinese Academy of Sciences, Beijing 100049, China | | LI Xu-hui | Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China | | YAN Bai-xing | Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China | | ZHANG Yan | Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China
University of Chinese Academy of Sciences, Beijing 100049, China | | LV Dui-an | Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China
University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: |
| Lab-scale experiments were carried out to compare the efficiency of nitrogen（N） removal by floating beds planted with common reed（Phragmites australis） and calamus（Acorus calamus） in eutrophic water man-made from water of Khanka Lake. The rhizome characteristics and the efficiency and rate of nitrogen removal by Phragmites australis and Acorus calamus were examined to study nitrogen removal mechanisms and major influencing factors. Results demonstrated that floating beds planted with Phragmites australis（3 replicas） and Acorus calamus（3 replicas） had water purifying ability. The average TN removal percentage was 91.5% and 84.2% for the reed beds and 89.9% and 82.8% for the calamus beds at 9.63 mg·L-1（feed A） and 4.58 mg·L-1（feed B） of TN concentrations in the feed water, respectively. Plant uptake contributed to 36.4%~77.1% of TN removal. The mean TN removal rate by the reed beds at late growth stage was 4.20 mg·L-1·d-1 and 1.77 mg·L-1·d-1, while that of the calamus beds was 1.75 mg·L-1·d-1 and 1.04 mg·L-1·d-1, respectively, for feed A and feed B. Significant correlations（R≥0.826 and P<0.01） were found between TN removal rates and total length, surface area and volume of plant roots. The plant roots is found to be the determinant factor of nitrogen removal efficiency in floating beds. |
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