Effect of Earthworm Eisenia Foetida in Constructed Wetland on Purification of Country Wastewaterâ¿¿

Based on the ecology theory,this study wants to improve the wetland ecological system for ideas, introduced the Eisenia foetida to add the food chain's link, strengthen the link of aquatic animals, educed the conclusion:The Eisenia foetida can improve the condition of dissolved oxygen in the wetland. When hydraulic load is 0.3m3/(m2·d),the average effluent concentration of COD, TN and TP are 41.02mg/L,4.59mg/L,12.58mg/L and 0.44mg/L respectively,the effluent water quality satisfy the | A level of discharge standard of pollutants for municipal wastewater treatment plant (GB18918-2002).