人工湿地在深圳坪山河综合整治工程中的应用

深圳市坪山河干流水环境综合整治工程以水质达标为目的,采用垂直潜流人工湿地处理上洋污水处理厂尾水并回补于河道,在河道两侧建设了深圳市最大规模的人工湿地(旱季处理规模为12. 65×10⁴m³/d,雨季规模为16. 55×10⁴m³/d)。采用蚝壳、沸石、粗砂等混合材料作为湿地填料,美人蕉、蜘蛛兰等兼具水处理功能和景观效果的土著植物作为湿地植物。经过近半年的试运行,湿地出水水质可稳定达到《地表水环境质量标准》(GB 3838—2002)Ⅳ类标准,对坪山河干流的水质保障和景观提升具有一定的作用。该工程是污水处理厂厂外提标的典型案例,具有很好的示范作用。

Application of Constructed Wetland in Comprehensive Control Project of Shenzhen Pingshan River

In the project of comprehensive control of Pingshan River in Shenzhen,in order to meet the standard effluent quality,the vertical flow constructed wetland was used to treat the secondary effluent of Shangyang wastewater treatment plant and the effluent of the constructed wetland was discharged into Pingshan River.The largest constructed wetland in Shenzhen had been built on both sides of the river(the dry season treatment capacity was 12.65×10~4 m^3/d,and the capacity in rainy season was 16.55×10~4 m^3/d).Oyster shells,zeolite and grit were used as filler in the constructed wetland.Canna,spider orchid and other native plants with both water treatment function and landscape effect were selected as wetland plants.The results of continuous operation in half a year showed that the effluent quality could meet theⅣclass standard of Environmental Quality Standards for Surface Water(GB 3838-2002).It was a typical case of enhancing standards outside the wastewater treatment plant,which had a certain effect on the water quality assurance and landscape improvement of Pingshan River,and had favorable demonstrative effect.