Design and application of nitrogen and phosphorus interception project in agricultural non-point source pollution
In view of agricultural non-point source pollution in rural pastoral ecosystem,a"new farmland ecological nitrogen and phosphorus interception system"is constructed by comprehensively transforming the existing agricultural irrigation ditches,constructing nitrogen and phosphorus interception ditches,ecological permeable dam,denitrification and phosphorus removal modules,etc.After the system was completed and operated steadily,the overall effluent water quality remained stable at or above the surface Class Ⅳ water,among which the chemical oxygen demand was reduced by 35.0%,ammonia nitrogen was reduced by 44.6%,and total phosphorus was reduced by 29.5%,effectively reducing the discharge of nitrogen and phosphorus pollutants in the region.The system has low investment cost and high efficiency,and has broad application prospects in similar ditch reconstruction projects.
agricultural non-point source pollutionnitrogen and phosphorus interception ditchecological permeable damdenitrification and phosphorus removal
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