Effect of Sulfur-iron Autotrophic Denitrification Constructed Wetland on Nitrogen in Black and Smelly Water
Current studies indicated that N and S elements were the key factors leading to water body black and odor. A S-Fe self-supporting denitrifying wetland system was constructed to control the black and odor water in rural areas of the Yellow River Basin. The autotrophical denitrification system used py-rite as electron donor and bluestone as acid-base balance regulating material,mixed at ratios of 3∶2 and 1∶1. The nitrogen removal effect of the constructed wetland system with different hydraulic residence time (HRT),the change in nitrogen removal along the path and microbial communities,were analyzed to verify the nitrogen removal and treatment effect of the constructed wetland system. The results showed that the system had the best denitrification effect when HRT was 24 h. TN and NO-3-N decreased from (12.88±0.4),(7.73±0.76) mg/L to (1.46±0.34) and (0.83±0.14) mg/L respectively,with the highest removal rates of 91.3％ and 91.8％. However,with the decrease of HRT,the nitrogen removal effect decreased. With the increase of relative height of sampling port 1～4,the nitrogen removal efficien-cy of the system increased significantly. Among them,the TN and NO-3-N removal rates of the construc-ted wetland system composed of pyrite,volcanic rock and bluestone with the volume ratio of 3∶5∶2,at the sampling port 4 were 87.07％ and 85.88％,respectively. The removal rates of TN and NO-3-N of sampling port 1 were only 15.91％ and 16.88％. In addition,Proteobacteria and Bacteroidetes were the dominant bacteria in this system.
rural dark smelling water bodiesautotrophic denitrificationconstructed wetlandsdenitrifcation effectalong course changes
万方数据
维普
