A molecular biology method, fluorescent in situ hybridization（FISH）, in which the pre-treatment was improved in allusion to the media of the constructed wetlands（CW）, e.g. the soil and the grit, was used to invest...A molecular biology method, fluorescent in situ hybridization（FISH）, in which the pre-treatment was improved in allusion to the media of the constructed wetlands（CW）, e.g. the soil and the grit, was used to investigate the vertical distribution characteristics of ammonia-oxidizing bacteria（AOB） quantity and the relation with oxidation-reduction potential（ORP） in the Typha latifolia constructed wetlands under three different Ioadings in summer from May to September. Results showed that the quantity of the AOB decreased in the Typha latifolia CW with the increase of vertical depth. However, the AOB quantity was 2-4 times the quantity of the control in the root area. Additionally, ORP in the rhizosphere was found to be higher than other areas, which showed that Typha latifolia CW was in an aerobic state in summer when using simulated non-point sewage at the rural area of Taihu Lake in China and small town combined sewage.展开更多
Three typical constructed wetlands(CWs)including Vertical Flow(VF),Free Water Surface(FWS),and Subsurface Flow(SF),and combined VF-SF-FWS constructed wetlands were investigated for the treatment of domestic wastewater...Three typical constructed wetlands(CWs)including Vertical Flow(VF),Free Water Surface(FWS),and Subsurface Flow(SF),and combined VF-SF-FWS constructed wetlands were investigated for the treatment of domestic wastewater with low C/N ratio.The performance of nutrient removal and the characteristics of greenhouse gas emissions,such as CH4 and N2O,from these CWs were compared.The results indicated that the four types of CWs had high removal efficiencies for organic matter and suspended solid(SS).The combined wetland also showed a comparatively good performance for nitrogen and phosphorus removal,and the removal efficiencies for total nitrogen(TN)and total phosphorus(TP)were 81.3%and 84.5%,respectively.The combined CWs had a comparative lower global warming potential.The FWS CW had the highest tendency to emit CH4 and led to a higher global warming potential among the four types of CWs,which was about 586 mg CO_(2)/m^(2)·h.展开更多
文摘A molecular biology method, fluorescent in situ hybridization（FISH）, in which the pre-treatment was improved in allusion to the media of the constructed wetlands（CW）, e.g. the soil and the grit, was used to investigate the vertical distribution characteristics of ammonia-oxidizing bacteria（AOB） quantity and the relation with oxidation-reduction potential（ORP） in the Typha latifolia constructed wetlands under three different Ioadings in summer from May to September. Results showed that the quantity of the AOB decreased in the Typha latifolia CW with the increase of vertical depth. However, the AOB quantity was 2-4 times the quantity of the control in the root area. Additionally, ORP in the rhizosphere was found to be higher than other areas, which showed that Typha latifolia CW was in an aerobic state in summer when using simulated non-point sewage at the rural area of Taihu Lake in China and small town combined sewage.
文摘Three typical constructed wetlands(CWs)including Vertical Flow(VF),Free Water Surface(FWS),and Subsurface Flow(SF),and combined VF-SF-FWS constructed wetlands were investigated for the treatment of domestic wastewater with low C/N ratio.The performance of nutrient removal and the characteristics of greenhouse gas emissions,such as CH4 and N2O,from these CWs were compared.The results indicated that the four types of CWs had high removal efficiencies for organic matter and suspended solid(SS).The combined wetland also showed a comparatively good performance for nitrogen and phosphorus removal,and the removal efficiencies for total nitrogen(TN)and total phosphorus(TP)were 81.3%and 84.5%,respectively.The combined CWs had a comparative lower global warming potential.The FWS CW had the highest tendency to emit CH4 and led to a higher global warming potential among the four types of CWs,which was about 586 mg CO_(2)/m^(2)·h.
