3 results about "Nonpoint source pollution" patented technology

The invention discloses a farmland water non-point source pollution treatment system based on nitrogen and phosphorus indicators, relates to the technical field of farmland water non-point source pollution treatment, comprises a sedimentation net, a maintenance component, an internal control component, a floating component and a purification component, the sedimentation net is arranged in a drainage trough, a plurality of purification pits for accommodating the maintenance component are evenly distributed on the side wall of the drainage trough, the internal control component is slidably arranged inside the maintenance component, the floating component and the purification component are connected to form a purification module, the purification modules are arranged in a plurality and are arranged in a purification tank; the floating component is sleeved with an air supply pipe and floats on the water surface, the upper end of the air supply pipe is connected to an external air source and the lower end is connected to the purification component, and the purification component is arranged in the water, the whole process makes full use of the drainage channel and the purification tank space to treat the farmland drainage, reduces the occupied space, and improves the absorption and treatment efficiency of nutrients such as nitrogen and phosphorus in the drainage per unit space.

This application belongs to the field of ecological and environmental protection technology, specifically relating to a method for delineating the width of river ecological buffer zones, aiming to address the shortcomings of traditional equal-width delineation methods in terms of pollution interception accuracy and land use efficiency. The method includes: extracting topographic and hydrological features based on a DEM and identifying key runoff paths to determine high-load inlets; constructing a spatial heterogeneity weighting factor by combining the average runoff accumulation, slope, and surface roughness of the upstream confluence area; dynamically calculating the buffer zone width at each inlet using a base width as a benchmark; generating boundaries by non-equidistant offset along the riverbank normal, and forming continuous closed polygons through smoothing and topological verification. This application, through hydrologically driven dynamic width adjustment, significantly improves the interception capacity for non-point source pollutants, avoids land resource waste, and achieves scientific, efficient, and automated ecological buffer zone delineation.

The invention relates to a plain river network polder area non-point source pollution water inlet load accounting method. The method comprises the steps that the runoff yield of a pollution production unit is calculated in a water volume module; calculating the non-point source pollution discharge amount of each pollution production unit in the water quality module; calculating a non-point source pollution in-water body coefficient of each pollution production unit in a water body migration module; and accounting to obtain the total load of the non-point source pollutants entering the water body of the pollution production unit. According to the method, polder area non-point source pollution characteristics, the distance between a pollution production unit and a receiving water body and the interception effect of forests and grassland on pollutants are fully considered, and meanwhile the runoff yields of different underlying surfaces under the rainfall condition are combined; therefore, the influence of different hydrological driving conditions and the land migration interception process on the non-point source pollutant entering the water body can be more accurately represented, the key time period and key area risk of the non-point source pollutant entering the water body can be identified, and the method has good applicability in actual implementation.