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| The efficiency of combined treatment of ozonation and Vallisneria spiralis in removing inorganic nutrients in piggery wastewater |
| Received:April 21, 2016 |
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| KeyWord:ozonation, piggery wastewater, advanced treatment, Vallisneria spiralis, nitrogen, phosphorus |
| Author Name | Affiliation | E-mail | | WANG Jun-li | Shanghai Academy of Agricultural Science, Shanghai 201403, China | | | CHEN Gui-fa | Shanghai Academy of Agricultural Science, Shanghai 201403, China | | | LIU Fu-xing | Shanghai Academy of Agricultural Science, Shanghai 201403, China | | | SONG Xiang-fu | Shanghai Academy of Agricultural Science, Shanghai 201403, China | | | ZOU Guo-yan | Shanghai Academy of Agricultural Science, Shanghai 201403, China | zouguoyan@263.net |
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| Abstract: |
| Piggery wastewater contains a high concentration of inorganic nutrients, and piggery effluent from conventional biological treatment processes still contain nutrient-rich matters, which poses a significant threat to surface and groundwater and requires subsequent treatment. In this research, piggery wastewater pretreated from oxidation pond followed by the constructed wetland was further treated by ozonation and Vallisneria spiralis. We measured the changes of inorganic nutrients(N and P) content in the piggery wastewater after exposed to different concentrations of ozone(AO1 10mg·L-1、AO2 30 mg·L-1、AO3 50 mg·L-1) for 30 min followed by growing Vallisneria spiralis for 4 weeks. We found that three levels of ozonation treatment decreased NO2- by 7.7%, 17.6% and 21.4%, respectively, and increased NO3- by 5.7, 4.2 and 2.4 times, and PO43- by 40.1%, 26.0% and 0.7%, respectively. After the treatment of Vallisneria spiralis, TN, NH4+, NO2- and TP were decreased by 11.4%~15.7%, 29.9%~34.2%, 22.6%~40.7% and 36.0%~38.0%, respectively, while NO3- was increased by 0.4~1.0 times. Our results indicated that ozonation could lead to dramatic changes of the chemical forms of inorganic nutrients even at a low ozone concentration, and culture of Vallisneria spiralis could obviously reduce the concentration of inorganic nutrients in the ozone-treated piggery wastewater. |
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