Removal of organic matter, nitrogen and faecal indicators from diluted anaerobically digested slurry using tidal flow constructed wetlands
Removal of organic matter, nitrogen and faecal indicators from diluted anaerobically digested slurry using tidal flow constructed wetlands
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DOI：
10.1007/s11356-016-8297-2
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发表时间：
2017-02-01
影响因子：
5.8
通讯作者：
Dong, Renjie
中科院分区：
文献类型：
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作者：
Guo, Luchen;Lv, Tao;Dong, Renjie
用于可再生能源生产的厌氧消化的快速实施导致厌氧消化浆料的产生增加，其含有多种污染物，因此有可能导致严重的环境问题。研究了能产生良好氧环境的潮汐流人工湿地对厌氧消化液中氮、有机物和病原菌的去除效果。结果表明，潮汐运行对NH 4 +-N和有机物（COD）的去除有积极的促进作用。在平均进水NH 4 +-N浓度为288 mg/L、COD浓度为839 mg/L的条件下，NH 4 +-N平均去除率为93%（325 g/m2·d），COD平均去除率为53%（603 g/m2·d），总无机氮（TIN）平均去除率为51%（226 g/m2·d）。潮汐运行CW中的氮去除高度依赖于淹没和排水（F/D）时间比。将淹没时间从3小时改变为5小时，增强了反硝化作用（亚硝酸盐还原酶-K（nirK）丰度），并进一步提高了62%（237 g/m（2）天）的TIN去除效率。粪便指标的去除也进行了检查，大肠杆菌和总大肠菌群的减少率约为0.9 log（10）CFU/100 mL，这是独立的进水负荷和不同的淹没/排水时间比。潮汐流CW被证明具有很高的潜力，以处理稀释的厌氧消化浆料。
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 NH4+-N and organic matter (chemical oxygen demand (COD)) removal. With an average influent NH4+-N concentration of 288 mg/L and COD concentration of 839 mg/L, the average removal efficiency reached up to 93% (325 g/m(2) day) for NH4+-N and 53% (603 g/m(2) day) for COD, with total inorganic nitrogen (TIN) removal efficiency of 51% (226 g/m(2) 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(2) day). The removal of faecal indicators was also examined, with reduction rate of approximately 0.9 log(10) 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.