低温条件下高效复合人工湿地对尾水的净化效应

Running effectiveness of integrated constructed wetland on purifying discharge from waste water treatment plant in cold season

为了提高污水处理厂尾水低温季节的净化效果,创新地设计了高效复合人工湿地工程(6万t·d^(-1)),应用在临安污水处理厂的尾水净化系统中。该工程在人工湿地前半段加上大棚保护措施,并集成了强化生物膜系统、有毒物质高效脱除系统、营养膜净化生态系统、高效自净水生态系统和高效生态滤地系统等多种技术。结果表明:在12月、1月、2月份低温冬季期间,该系统对氨氮、硝态氮、总氮、总磷和COD的平均去除率分别为68%、34%、39%、87%和34%,其处理能力在冬季仍然较高,相当于3—5月份春季的处理水平;大棚保护设计的子系统在低温季节中污染物去除贡献率较大。该高效复合人工湿地,特别是大棚保护式人工湿地子系统,能明显提高低温条件下对污染物的去除效率,提高冬季人工湿地运行效率。

To improve the running effectiveness of a constructed wetland in cold weather,a greenhouse was built in front of the constructed wetland and different techniques were integrated to purify the discharge from the Linan Sewage Water Treatment Plant（ 60 000 t· d^-1）. The running effectiveness of the wetland was analyzed in both winter and spring. The results showed that the removal rate of ammonium nitrogen（ NH4^＋-N）,nitrate nitrogen（ NO3^--N）,total nitrogen（ TN）,total phosphor（ TP）,and chemical oxygen demand（ COD） in cold winter from December to February averaged 68%,34%,39%,87%,and 34%,respectively. The pollutant treatment capacity in winter was similar with that of spring（ March to May）. The results indicate that the integrated wetland system with added greenhouse subsystems significantly improved the pollutant treatment efficiency in cold weather.