Abstract
To lower phosphorus concentration in Xi’an moat, four different phosphorus-locking materials, namely, calcium nitrate, sponge-iron, fly ash, and silica alumina clay, were selected in this experiment to study their effects on water quality and sediment. Results of the continuous 68-day experiment showed that calcium nitrate was the most effective for controlling phosphorus concentration in overlying and interstitial water, where the efficiency of locking phosphorus was >97 and 90 %, respectively. Meanwhile, the addition of calcium nitrate caused Fe/Al-bound phosphorus (Fe/Al-P) content in sediment declining but Ca-bound phosphorus (Ca-P) and organic phosphorus (OP) content ascending. The phosphorus-locking efficiency of sponge-iron in overlying and interstitial water was >72 and 66 %, respectively. Meanwhile, the total phosphorus (TP), OP, Fe/Al-P, and Ca-P content in sediment increased by 33.8, 7.7, 23.1, and 23.1 %, respectively, implying that under the action of sponge-iron, the locked phosphorus in sediment was mainly inorganic form and the phosphorus-locking efficiency of sponge-iron could be stable and persistent. In addition, the phosphorus-locking efficiency of fly ash was transient and limited, let alone silica alumina clay had almost no capacity for phosphorus-locking efficiency. Therefore, calcium nitrate and sponge-iron were excellent phosphorus-locking agents to repair the seriously polluted water derived from an internal source.
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Acknowledgments
This work was funded by Technology Bureau of Xi’an [Grant Number: SF1430] and State Key Laboratory of Pollution Control and Resource Reuse Foundation (No.PCRRF14013). The research was also supported by the innovative research team of Xi’an University of Architecture and Technology. The authors wish to express their gratitude to the City Wall Management Committee of Xi’an for supporting this study.
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Wang, G., Wang, Y., Guo, Y. et al. Effects of four different phosphorus-locking materials on sediment and water quality in Xi’an moat. Environ Sci Pollut Res 24, 264–274 (2017). https://doi.org/10.1007/s11356-016-7796-5
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DOI: https://doi.org/10.1007/s11356-016-7796-5