Analysis of the Operational Effect of Greenhouse Type Multi-Medium Artificial Wetland for Sewage Treatment in Highland Regions
Based on the characteristics of domestic sewage in Tibet Autonomous Region and the living habits of residents,a greenhouse multi-medium with a treatment capacity of 1 000 m3/d was constructed Constructed wetland demonstration project,through the combination of greenhouse multi-media constructed wetland and outdoor horizontal subsurface flow constructed wetland treatment of domestic sewage in the county,in order to achieve the purification of domestic sewage in the area and to supplement the ecological water of the nearby water environment.Monitoring data show that the average effluent concentration of COD,ammonia nitrogen,total nitrogen and total phosphorus is 40.92 mg/L,4.28 mg/L,8.20 mg/L,and 0.40 mg/L during the whole operation of the multi-media constructed wetland in the greenhouse.The effluent quality is higher than the Discharge Standard for Pollutants in Urban Sewage Treatment Plants(GB 18918-2002)(hereinafter referred to as the"Standard")Grade A standard,the system effectively overcomes the climatic conditions of high cold and hypoxia in Tibet,and has efficient and stable deconsolidation performance.In addition,the final COD(28.02 mg/L)and total phosphorus(0.24 mg/L)effluent quality of the outdoor subsurface flow constructed wetland reached the Class Ⅳ standard of the Surface Water Environmental Quality Standard(GB 3838-2002).In view of the nitrogen and phosphorus elements are necessary for plant growth,the project effluent can be reused to supplement the wetland.The successful operation of this project has a certain demonstration role and application value for the treatment of county sewage in constructed wetland in Tibet Autonomous Region.
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