Research on Purification Effect of Different Aquatic Plants on Swine Wastewater
[Objective]To screen the dominant species in constructed wetlands suitable for application to swine wastewater.[Method]Four a-quatic plants including iris,canna,cress and pickerelweed were selected to monitor the effects of different hydraulic retention times on the con-centration of chemical oxygen demand(COD),total nitrogen(TN),total phosphorus(TP)and ammonia nitrogen(NH4+-N)in wastewater through a vertical flow constructed wetland device.The purification effect of the four aquatic plants on wastewater was analyzed.[Result]With the delay of hydraulic retention time,the concentrations of COD,TN,TP,and NH4+-N in wastewater in constructed wetlands gradually de-creased,and the purification effect improved.When the hydraulic retention time was 5 days,the removal rates of COD and NH4+-N by iris were the highest,which were 61.80%and 68.35%,respectively;the removal rates of TN and TP by pickerelweed were the highest,which were 30.92%and 81.53%,respectively.[Conclusion]The purification effect of constructed wetlands on pig wastewater was better by planting iris and pickerelweed.
万方数据
维普
