复合湿地系统净化冷水鱼养殖废水的研究

Study on the Treatment of Wastewater from Cold Water Fish Breeding by an Integrated Wetland System

实验选址于北京市怀柔区渤海镇,建成的复合湿地系统包括经改良自然湿地和人工湿地两部分,用于当地冷水鱼养殖业排放的养殖污水的处理.结果表明:复合湿地系统对TN、TP、COD的去除率分别为61%,57%和66%,复合湿地的整体去除率大于使用一种单独的湿地处理系统.通过相关分析发现:在自然湿地系统中,TP和COD的去除率与入水浓度具有相关性;在人工湿地系统中,TN和COD的去除率与入水浓度具有相关性;在复合湿地系统中,COD的去除率和TN、TP的去除率具有相关性,而TN、TP的去除率之间没有显著的相关性.复合湿地系统结合了自然湿地和人工湿地的特点,是对冷水鱼养殖废水净化处理的新探索.

In the study, an integrated wetland system （IWS）including constructed wetlands （CWs）and modified natural wetlands（NWs） was established for aquaculture wastewater treatment located at the Bohai Town, Huairou District, Beijing. The results show that the removal efficiency of TN, TP, COD in the IWS is 61%, 57% and 66%, respectively. The overall removal efficiency of the IWS is greater than use a separately wetland treatment system. The correlation analysis show that significant relationship existed between the removal efficiency and influent concentration of TP and COD in NWs,and it also exist between the removal efficiency and influent concentration of TN and COD in CWs. As for the IWS, the removal efficiency of COD is positively correlated with that of TN and TP with the correlation coefficient of 0. 663,0. 689 respectively, under the significance level of 0. 05. However, the correlation between the removal efficiencies for TN and TP is not significant. IWS is integrating functions of NWs and CWs which could explore a new way to treat the wastewater discharged from cold water fish farming.