Guo Luchen, Lv Tao, He Keli, Wu Shubiao, Dong Xinlong, Dong Renjie
Key Laboratory of Clean Utilization Technology for Renewable Energy, Ministry of Agriculture, College of Engineering, China Agricultural University, 100083, Beijing, People's Republic of China.
Department of Bioscience, Aarhus University, 8000C, Aarhus, Denmark.
Environ Sci Pollut Res Int. 2017 Feb;24(6):5486-5496. doi: 10.1007/s11356-016-8297-2. Epub 2016 Dec 27.
The rapid implementation of anaerobic digestion for renewable energy production has resulted in increased generation of anaerobically digested slurry, which contains a variety of pollutants and therefore has the potential to cause serious environmental problems. Tidal flow constructed wetlands, which could generate beneficial oxygen conditions, were investigated for their success in removing nitrogen, organic matter and pathogens in anaerobically digested slurry. The results indicated that tidal operation had a positive effect on promoting NH-N and organic matter (chemical oxygen demand (COD)) removal. With an average influent NH-N concentration of 288 mg/L and COD concentration of 839 mg/L, the average removal efficiency reached up to 93% (325 g/m day) for NH-N and 53% (603 g/m day) for COD, with total inorganic nitrogen (TIN) removal efficiency of 51% (226 g/m day). The nitrogen removal in the tidal-operated CWs is highly dependent on the flooded and drained (F/D) time ratio. Changing flooded time from 3 to 5 h enhanced denitrification (nitrite reductase-K (nirK) abundance) and further resulted in improved TIN removal efficiency of 62% (237 g/m day). The removal of faecal indicators was also examined, with reduction rate of approximately 0.9 log CFU/100 mL for both Escherichia coli and total coliforms, which was independent of the influent loadings and differing flooded/drained time ratio. Tidal flow CWs were demonstrated to have the high potential to treat diluted anaerobically digested slurry.
厌氧消化用于可再生能源生产的迅速实施导致厌氧消化浆液的产量增加，这种浆液含有多种污染物，因此有可能引发严重的环境问题。对能够产生有益氧气条件的潮汐流人工湿地进行了研究，以考察其去除厌氧消化浆液中氮、有机物和病原体的成效。结果表明，潮汐运行对促进氨氮和有机物（化学需氧量（COD））的去除具有积极作用。进水氨氮平均浓度为288毫克/升，COD浓度为839毫克/升，氨氮平均去除效率高达93%（325克/平方米·天），COD平均去除效率为53%（603克/平方米·天），总无机氮（TIN）去除效率为51%（226克/平方米·天）。潮汐运行的人工湿地中的氮去除高度依赖于淹水和排水（F/D）时间比。将淹水时间从3小时改为5小时可增强反硝化作用（亚硝酸还原酶-K（nirK）丰度），进而使TIN去除效率提高至62%（237克/平方米·天）。还对粪便指示菌的去除情况进行了检测，大肠杆菌和总大肠菌群的减少率约为0.9个对数CFU/100毫升，这与进水负荷和不同的淹水/排水时间比无关。潮汐流人工湿地被证明具有处理稀释厌氧消化浆液的巨大潜力。
