| 摘要: |
| 以南京水利科学研究院铁心桥试验基地内象目湖微污染水体为对象，研究总氮大于1.0 m3/（m2•d）的高水力负荷条件下，鹅卵石、陶粒、砾石、钢渣、蛭石、碎石和砂子等多种基质和再力花、芦苇、美人蕉及菖蒲等水生植物组合条件下的垂直流湿地和水平潜流湿地对氮磷的去除效果。试验结果表明：进水总氮浓度在0.793~2.662 mg/L时，种植菖蒲，填料从上到下分别为鹅卵石、碎石、粗砂和细砂的垂直潜流湿地单元（20单元）出水总氮平均浓度最低，为0.905 mg/L；总氮、氨氮和硝态氮平均去除率最高，达80.89%，43.06%和46.32%；总氮浓度从IV类水体提升至III类。进水TP浓度在0.035~1.003 mg/L时，20单元总磷平均去除率最高，为30.59%，价格相对便宜的碎石对磷素的去除效果较好。种植菖蒲及填料组合为鹅卵石、碎石、粗砂和细砂的人工湿地处理单元可以应用于饮用水源地原水等微污染水强化处理。 |
| 关键词: 微污染水 潜流湿地 氮 磷 |
| DOI： |
| 分类号:X52 |
| 基金项目:江苏省水利科技项目（2015072）； 南京水利科学研究院基本科研业务费专项资金资助项目（Y513011, Y516013, Y517001, Y917014） |
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| Pilot experiment on effects of subsurface artificial wetland on nitrogen and phosphorus removal in slightly-polluted surface water body |
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LU Haiming1, SUN Jinhua1, LIU Ting2, LIU Hao2, SONG Li3, ZHU Qiande1
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1.State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing;2.North-Extended Water Supply Project Management Division for Tongyu River of Lianyungang City, Lianyungang;3.Institute for Water Resources Research of Jiangsu Province, Nanjing
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| Abstract: |
| The removal efficiency of the horizontal and vertical subsurface constructed wetlands with various combinations of substrates and aquatic plants and nitrogen and phosphorus from the slightly-polluted water body in the Xiangmu lake was investigated as a pilot experiments at the Tiexinqiao Water Experimental Center of Nanjing Hydraulic Research Institute. The analysis and testing results show that when the total nitrogen concentration in inflowing water is 0.793-2.662 mg/L, the average concentration of the total nitrogen in the vertical subsurface constructed wetland unit (unit 20) with cobblestone, gravel, coarse sand, find sand as the substrates and acoruscalamus as vegetation is the lowest, reaching 0.905; the average removal rate of the total nitrogen is the highest, up to 80.89%， 43.06% and 46.32% respectively during the testing periods, and the total nitrogen concentration in the outflow is reduced and the water quality is improved from the 5th category to the 3rd category. The mean total nitrogen concentration of the effluent from unit 20 is also 0.905 mg/L, which is lower than the 3nd of national water quality standard (GB3838—2002). When the influent phosphorus concentrations was 0.035-1.003 mg/L, the average total phosphorus removal rate of unit 20 was the highest, reaching 30.59%. Cheap gravel could obtain a relatively high phosphorus removal rate. The typical combination of aquatic plant and substrates in unit 20 can be applied to the nitrogen and phosphorus removal from the slightly polluted surface water body. |
| Key words: slightly polluted water subsurface constructed wetland nitrogen phosphorus |
