美人蕉浮床去除临江河N、P的动态试验研究

Dynamic Pilot Study on Purification N、P of Linjiang River Water with Floating Bed Technology of Canna Indica

本试验以长江次级河流临江河为研究对象,利用美人蕉四级串联浮床系统净化重污染次级河流的动态试验。研究结果表明,当进水TN,TP,NH3-N,COD分别为7.8～12.1、1.06～1.89、4.8～8.7、29～46 mg/L时,美人蕉生长状况良好。在水力负荷为0.8 m3/(m2.d)的条件下,美人蕉四级串联浮床系统内DO逐级下降,在植物收割前对TN、NH3-N、TP的平均去除率达到56.82%,66.08%,49.36%,与单级相比,去除率提高了27.33%,35.69%、16.15%,其中TN和NH3-N的去除率最高达到了80.39%和94.45%,并且TN、NH3-N的去除与温度正相关,这为利用美人蕉浮床技术对次级河流水体的净化提供了一定的依据。

This dynamic pilot study on purification of Linjiang river, branch of Yangtze River, by canna indica with four-stage floating bed technology was performed. The results showed that： canna indica was normal when TN,TP, NH3-N,COD concentrations in water were 7.8- 12.1 mg/L, 1.06- 1.89 mg/L, 4.8-8.7 mg/L, 29-46 mg/L. With the hydraulic load of 0.8m^3/（m^2·d）,the content of DO is shorter stage by stage, the removal rates of NH3- N, TP, and TN from heavily polluted river water by canna indica floating bed were 56.82%, 66.08%, 49.36%. Compared to the one-stage floating bed, the removal rates of TN , TP , NH3-N increased by 27.33%, 35.69%. 16.15% ,and the removal rates of NH3-N and TN of canna indica floating bed were positively correlated to water temperature. This dynamic pilot study can provid some help for the branch rivers water＇s purification of canna indiea floating bed technology.