| In urban life,more and more urban parks and artificial lakes have brought about pollution problems of urban landscape water.The eutrophication of landscape water bodies and the odor of water bodies are increasing,and the destruction of water environment ecosystems has brought different degrees of impact on the lives of urban residents.In response to this phenomenon,good ecological restoration technology has become a hot research topic at present.Based on field investigation and analysis of Chaohu,this paper makes an experimental study on the landscape water bodies of the Zhuanchi River and the East-West Ring River in Chaohu by using the new biological grid technology instead of the traditional ecological restoration method.Study on the difference of different plants in removing pollutants from landscape water by bio-grid small scale device and pilot experimental device,investigate the purification effect of different plant bio-grid systems on landscape waters under different seasonal conditions,investigate the relationship between microbial diversity and pollutant degradation in bio-grid systems.The aim was to provide reference for the treatment of city landscape water bodies and the selection of ecological restoration schemes for the new bio-grid technology in practical engineering applications.The main contents,methods and research results of this article are as follows:?1?In the experimental study of the new bio-grid small scale device,using the ring city river of Chaohu as the research object.Four sets of bio-grid small scale device and one set of blank control device were constructed by using Canna,Iris and combined packing.It has ideal removal effect on COD,TN,TP and NH3-H in the landscape water body of the ring river in Chaohu city,the test results can reach the surface water quality standard of Class IV.In the experiment,We obtained the removal rate of COD,TN,TP and NH3-H in the landscape water body of the ring river from the experimental group up to32.63%53.52%,48.15%83.87%,22.52%75.00%,40.91%88.20%.In the test,the contribution rate of the combined fillers to COD,TP,TN and NH3-H in water was:14.47%20.89%,46.47%52.48%,30.76%55.51%,39.53%53.27%.Indicating that the importance of the filler to the bio-grid system and provide great help for the removal of pollutants in the water.In the small scale device experiment,from the removal effect,the Canna bio-grid is most effective in removing pollutants from water,the removal rates of COD,TN,TP and NH3-H in the system were 53.52%,75.00%,83.87%and 88.20%,respectively.?2?In the experimental study of the new bio-grid pilot experimental device,using the zhuanchi river as the research object,using two different biological grating systems:Canna bio-grid and Iris bio-grid.To study the effects of removal of COD,TN,TP and NH3-H in the water of zhuanchi river under different plant configurations and different seasons.The results showed that the average removal rate of COD,TN,TP and NH3-H in the water of zhuanchi river by Canna bio-grid system was as follows:29.29%,42.63%,41.95%,44.65%.The average removal rates of COD,TN,TP and NH3-H in the water of the zhuanchi river by Iris bio-grid system were as follows:26.29%,41.19%,37.42%,41.16%.The best period of effect for the purification of the zhuanchi river water by the two groups of bio-grids is from September to November,the purification effect of river water during the low temperature season from December to February is relatively poor,the effect of river water purification has been improved after the temperature rise from February to March.Influenced by different seasons and influent concentration,two groups of bio-grid systems have good load-resistance ability,the effluent water quality is relatively stable,however,the impact of the season on the bio-gate is relatively large,low temperature conditions in winter can inhibit the activity of biological grating to a certain extent,resulting in its removal efficiency is not as good as that in other seasons.Because the Iris itself has the characteristics of overwintering growth,Canna has no such characteristics,therefore,the effect of Iris bio-grid on pollutant removal in river water is better than Canna bio-grid under low temperature in winter.However,the best overall purification effect is the Canna bio-grid.The removal rate of COD,TN,TP and ammonia nitrogen?NH3-H?in river water can reach:56.10%,71.46%,71.79%,71.26%.?3?In the analysis of microbial diversity of fillers and roots,using high-throughput sequencing technology,the results show that,the number,structure and type of microbial flora on the filler and root of the system have been changing with the operation of the device,but ultimately,the structure and quantity of microorganisms in the system tend to be stable.The change of microorganisms during the test was basically consistent with the change of pollutant removal effect of pilot experimental device during this period.It shows that the change of microbial community diversity is interrelated to its pollutant removal efficiency.Due to the influence of external environmental factors during the experiment,while maintaining high richness but the microorganism activity was inhibited,the removal efficiency of pollutants during the experiment has a significant downward trend.On the diversity of bacteria in the system,there are significant differences in microbial community structure in different periods,but it tends to be stable in the later stage of the experiment.Microorganisms in fillers and roots maintain relatively similar metabolic functions,it shows that microorganisms can maintain their functional integrity and stability by adapting to the changing environment during the operation of the bio-grid system. |
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