Effect Of A New Type Of Modified Substrate On Vertical Flow Constructed Wetland For Landscape Water Treatment

First of all this paper describes the shortage of our country water resources,space allocation,city landscape water pollution caused by the improper management and a series of problems of water environment,take artificial wetland treatment technology for landscape water,and later in the garden landscape water in Guangzhou full investigation and research,the establishment of artificial wetland system and ecological floating the bed was applied.In order to improve the treatment efficiency of constructed wetland system's water landscape,this study mainly through the improvement of wetland matrix in the form of artificial wetland system to improve the removal efficiency of nitrogen and phosphorus,the removal rate of COD.According to the characteristics of landscape water with high content of nitrogen and phosphorus,this research mainly adopts nano calcium carbonate,nano silica,biochar,coating ceramsite and other new materials were improved,the traditional matrix in the later stage of the experiment,the combination system of artificial wetland and ecological floating bed building in Nansha Garden District of Guangzhou city to the cell interior water.The results are as follows.(1)The adsorption kinetics showed that the adsorption efficiency of nano calcium carbonate,nano silica is higher than that of sand.At the same concentration,nano calcium carbonate,nano silica 2h after reaching the maximum adsorption capacity,river sand 4h after reaching the maximum adsorption.The maximum adsorption capacity and nano calc ium carbonate is greater than the maximum adsorption capacity of nano silica.The maximum adsorption capacity of two is greater than the maximum adsorption capacity of the sand.(2)The use of nano calcium carbonate filler matrix,nano silica modified artificial wetland,river sand matrix compared with the traditional model,improved matrix material,by dropping the effluent ammonia nitrogen,nitrate nitrogen,total nitrogen,total phosphorus,COD contrast,modified substrate on ammonia nitrogen,total phosphorus removal is good effluent water.(3)Add photocatalytic materials and biological carbon in composite soil column system,compared with traditional packing,the effluent ammonia nitrogen,the removal rate of COD has been significantly improved,the removal rate of ammonia nitrogen reaches 77.52%~95.40%,the removal rate of COD reached 57.18%~75.93%,the effluent quality reached.(4)The water quality of 6 constructed wetlands in 26 rural wetland demonstration projects in Q ingyuan was selected randomly,and the indexes of two grade wetland effluent met the requirements.To sum up,it can be concluded that the use of nano calcium carbonate,nano silica,biochar,coated ceramic and other new materials to improve the substrate of artificial wetlands is feasible.