Purification of countryside wastewater in Eisenia foetida constructed wetland.
Based on the ecology theory,the improved wetland ecosystem was studied,with addition of Eisenia foetida to the food chain and strengthening of link of aquatic animals.It concluded that Eisenia foetida can improve the condition of DO in wetland.Under hydraulic load of 0.3m3(/m2·d),average effluent concentration of COD,TN and TP were 41.02mg/L,12.58mg/L and 0.44mg/L respectively,with the effluent water quality satisfactory to discharge standard for urban wastewater treatment plant of Grade I of GB18918-2002.