Assessing the Performance Effects of Dairy Farm Wastewater by Subsurface Constructed Wetland

In order to investigate the feasibility of treatment of dairy farm wastewater by constructed wetland and to provide the operation parameters for a full scale constructed wetlands to improve the quality of effluent water, A pilot test was conducted with a plug flow constructed wetland to treat dairy farm wastewater in Ji´nan city. The results show that, under influent loading rate 3m³·d^-1, the average removal efficiency of chemical oxygen demand (COD), Total phosphorus (TP), total nitrogen (TN), and ammoniacal nitrogen(NH₄⁺-N) in the plug flow constructed wetland were 66.98%, 57.49%, 57.16%, and 55.09%, respectively. Temperature has a positive effect on the removal rate. The study indicates that t purifying dairy farm wastewater by constructed wetland is the combined actions of physical chemistry, plants and microorganism.