38 results about "Sediment pollution" patented technology

The invention discloses a method for determining ecological dredging range of water body pollution bottom sediment, comprising steps of: performing space gridding to a water area; setting a sampling point, and obtaining bottom sediment pollution level attribute information of the sampling point; determining the water area requiring dredging after excluding the water area without dredging; processing space interpolation to the bottom sediment attribute information of the water area to cover an unsampled water area with the attribute information, and obtaining the mean value of the single attribute information of the space interpolation in a grid cell, and grading the attribute, and rounding the attribute mean value of the grid cell hierarchically; performing dimensionless standardization treatment of 0-1 numerical values to the hierarchically rounded attribute information, and obtaining the evaluation coefficient of each attribute of the grid cell, summing the evaluation coefficients of all attributes of the grid cell to obtain a comprehensive evaluation value of the grid cell; classifying the comprehensive evaluation values of all grid cells by a natural breaking method of geographic information software and determining the recommended dredging area as the ecological dredging range with high comprehensive evaluation value.

The invention provides a river / lake heavy metal pollution sediment in-situ coverage method and device. The method comprises the following steps: adding iron tailings to the surface layer of polluted sediment, evenly mixing, adding cement to the surface layer of the sediment, and evenly mixing to form a solidified coverage layer. The coverage device at least comprises two coverage units, wherein the coverage units are connected together in series; every two adjacent coverage units are connected together through a connecting frame which is connected with an undercarriage through a hydraulic cylinder; and each coverage unit comprises a frame, a fixed plate, a turnover board, an electric mixer and a feed port. By using iron tailing grains and cement as the coverage material, the invention can effectively fix the heavy metals, lower the consumption of the coverage material, avoid reducing the effective volume of the river or lake due to excessive addition of the coverage material, effectively prevent the sediment from resuspension, effectively prevent the sediment pollution on the deep layer from releasing to the overlap water body, and reduce the adverse effect of the treatment process on the overlap water body.

The invention discloses a test method for simulating the discharge of bottom mud pollution under the action of river channel scouring. The test device is prepared, and the water depth and flow velocity in the test water tank are preset and tested according to the test requirements, and the flow rate in the test water tank is calculated according to the flow velocity; The bottom mud is laid in the mud storage box, so that the water baffle covers the upper surface of the bottom mud; the preset water depth is added to the test tank, and the variable speed motor is started to drive the flow to make the flow reach the required flow and keep the flow rate constant. change; when the water flow is constant, the water retaining plate shrinks to expose the surface of the sediment; open the sampling port for layered sampling; use a water quality analyzer to measure the water; respectively measure the variation and verticality of the concentration of sediment pollutants under different simulated dynamic conditions. distribution characteristics. The flow-making paddle creates flow in the narrow flow-making section and reduces the scale of the flow-making. The retractable water baffle reduces the disturbance effect on the sediment during the initial flow-making. for various tests.

The invention relates to a method for discriminating pollution types of heavy metal-polluted sediment in an environmental protection dredging project. The main technical schemes adopted are: establish a sample library of heavy metal content in surface sediment samples and a sample library of heavy metal content in columnar sediment samples; calculate the baseline value of heavy metal content in surface sediment samples according to the data in the sample library, and calculate the The baseline value of heavy metal content; according to the above baseline value, the status of heavy metal non-point source pollution in surface sediments can be judged, and the status of heavy metal point source pollution in surface sediments can be judged; the relative proportion of heavy metal point source pollution and non-point source pollution can be calculated, and heavy metal pollution in sediments can be judged type. This method solves the technical problem that the existing heavy metal pollution risk assessment methods in sediments are not enough to reflect the type of heavy metal pollution in sediments, and helps to determine and formulate targeted countermeasures to avoid "over-protection" and "over-protection". underprotection” issue.

The invention discloses a screening method for sediment remediation technology application. According to the invention, integrated analysis and parsing are carried out on years of data of lakes, oceans, rivers, reservoirs and the like to formulate key parameters required by sediment remediation technology screening, with the data including total nitrogen, total phosphorus and organic matters, active phosphorus, active nitrogen, phosphorus adsorption parameters, an electron transfer system, nitrogen and phosphorus release rates and the like; according to the method, before a sediment remediation technology application scheme is formulated, the pollutant distribution situation, the pollutant main form, the pollutant release potential and capacity and the like of the sediment can be fully known, meanwhile, the relevance between each index and the sediment pollution degree and the remediation technology are quantified, and accordingly a set of sediment remediation technology selection method is constructed. The method is simple, reliable and strong in practicability, improves the accuracy and scientificity of sediment remediation technology selection, and is suitable for application and popularization.

The invention relates to the field of water environment treatment conducted by microorganisms, in particular to a method for repairing sediment pollution in an open sea area or a deep freshwater area, a river mouth and the like. The method comprises the steps: loading a bacterial strain with zeolite, coating with a flocculating agent and putting the coated bacterial agent into a to-be-treated water area so as to repair sediment petroleum and organic pollutants in the water area. The method mainly aims at the seawater / freshwater area with the water depth being 2 to 50 meters and has a good effect of repairing the sediment petroleum pollution and other organic pollution. The method is integral in system and simple in operating method, has the remarkable effect of repairing the sediment, no secondary pollution and high offshore construction safety, and is particularly suitable the special-function sea areas such as a petroleum exploitation area and an aquaculture area, and can guide implementation of sea sediment pollution repair engineering.

The invention discloses a hydraulic dam with a built-in drive support mechanism and a method for using the same. It comprises: a dam body; a telescopic cylinder installed along the height direction of the dam body; The piston rod of the cylinder is hinged; the support rod used to support the dam body, the upper end of the support rod is fixedly connected with the second end of the connecting rod arm, and the telescopic cylinder is installed in the gap between the vertical and horizontal beams of the arc cavity in the dam body, free from water erosion and sediment Pollution, improve service life and reduce failure rate.