33 results about "Pollutant transport" patented technology

The invention discloses a project scheduling and tidal river network pollutant transport process coupled numerical value simulation method. The method comprises the following steps of: establishing a tidal river network one-dimensional hydrodynamic force-water quality model; establishing a project application model to realize accurate and quantitative description of a project type and an application manner; solving the tidal river network one-dimensional hydrodynamic force-water quality model and the project application model by adoption of a finite difference format and a four-cascade solution; and establishing a gate pump group multi-target optimal scheduling model through aiming at targets of flood control, flood drainage and water quality improvement and project constraint conditions. According to the method disclosed by the invention, the accurate and quantitative description of interaction of a hydrodynamic process, a pollutant transport process and project scheduling is realized; and on the basis of simulating the project scheduling, the established gate pump group multi-target optimal scheduling model is utilized to obtain a gate pump group combined optimal scheduling scheme, so that the practical application value of the project scheduling simulation can be remarkably improved.

The invention discloses a water-sand interface pollutant transport experiment device and an implementation method thereof. The experimental device comprises: an experimental solution tank connected with a water tank main body; a multi-pump linkage system formed by connecting five groups of centrifugal pumps and valves in parallel; an upstream pool located at the front end of the water tank; a simulation river bed water tank main body and a sediment retaining pool; a multi-frequency water level control system comprising a drive system, a transmission system and a water level control valve; anda tail pool arranged at the tail end of the water tank. The experiment method mainly comprises the steps of: establishing an indoor circulating water tank and an experimental sand slope, and regulating the circular flow and the size and frequency of the water depth to simulate the transport of the pollutants at a water-sand interface under the duration drive of different flood peaks and flood. Theexperiment data and the related parameters are collected to simulate the transport of the pollutants at the water-sand interface under the multi-frequency flood drive to reflect the influences of different-parameter floods of the river on the transport of the pollutants at the water-sand interface and the phreatic zone, the experiment device can change a plurality of flood parameters such as theflow, the flow change frequency, the water level and the water level change frequency, and therefore, the experiment is convenient, and the achievement is intuitive.

The invention discloses a method for quantifying solute transport multi-scale characteristics in a complex medium. The method comprises the steps of selecting a solute transport process in a concretecomplex medium as a research object, determining a test condition, observing a movement trajectory of a solute particle to obtain test data R of a mean square displacement of the solute particle, wherein R is a set of average values of distances between positions x of all particle at the t moment and respective initial point when the movement time is t; deducing a multi-scale transport rate of thesolute transport according to a distributed step fractal derivation model or an equivalent form thereof; calculating a value of a parameter c in the multi-scale transport rate in combination with thetest data R of the mean square displacement of the solute particle; and obtaining multi-scale characteristics of the solute transport in the complex medium according to the value of the parameter c,and classifying the solute transport process. The method for quantifying the solute transport multi-scale characteristics in the complex medium has broad engineering application prospects, can be usedfor prediction, assessment and management of pollutant transport. Compared with an existing model or technology, the method is more convenient for engineering use.

The invention provides a three-dimensional sampling method for simulating transport of river contaminations. The method is characterized in that during contamination transport on-site simulation test, a catamaran reaches a testing section before contamination clusters; as the contamination clusters approach the testing section, the position of the catamaran is adjusted so as to allow the contamination clusters to be located between two boats and to be free of disturbance; and then a multi-point sampler is used to extract water samples at different water depths and different distances from an initial point so as to realize measurement of three-dimensional distribution of the concentration of the river contaminations. The three-dimensional sampling method provided by the invention realizes simultaneous and rapid sampling of a plurality of sampling points and guarantees representativeness and authenticity of the water samples.

The invention discloses a pollutant health risk assessment method based on process simulation and uncertainty analysis. The method combines the health risk assessment with the migration process of groundwater pollutants, and uses TOUGH2 software to simulate the temporal and spatial distribution of organic pollutants in groundwater . In order to improve the reliability of the evaluation results and consider the impact of pollutant migration uncertainty on human health risk assessment, the key parameter media permeability was identified through the Markov chain Monte Carlo simulation method. This method improves the reliability of risk assessment results by analyzing the uncertainty of pollutant migration simulation, and provides decision-making information for the management and prevention of polluted sites.

Polycrystalline silicon chunks are packed for further processing and / or for shipment with minimal contamination by introducing the chunks into a cardboard container lined with a non-contaminating plastic. The process is economical, avoids the problems associated with packaging in plastic bags, and provides far less contamination and spillage during transport.

The invention discloses a device for simulating influence of a puddle in a pipeline on pollutant transport and a working method. The device comprises a constant-head water tank, a circular pipe, a flow control valve, an electromagnetic flowmeter, a carrier, a rectangular-outlet water tank and a syringe, wherein when single pipeline solute transport is simulated, the carrier is a circular pipe; when pipeline and water tank solute transport is simulated, the carrier is a water tank. The device has the advantages that the outlet solute concentration curve under different experiment conditions can be obtained fast by changing the pipeline structure and regulating flow rate, and a quite effective method is provided for the quantitative analysis of the influence of the puddle in the pipeline on solute transport.

The invention provides a three-dimensional sampling device for simulating transport of river contaminations. The three-dimensional sampling device is composed of a bank control point, a catamaran sampling platform and a multi-point sampler. The device is characterized in that the catamaran sampling platform moves in a river under the control of the bank control point; and when the catamaran sampling platform reaches a sampling position, the multi-point sampler installed on a sampling device takes water samples at different water depths and different distances from an initial point from a to-be-measured section. The three-dimensional sampling device provided by the invention can meet requirements for safety, easy operation, small disturbance to a flow field of river water and the like at the same time, has high sampling efficiency and accurate sampling position and guarantees accuracy and representativeness of the water samples.

The application discloses a groundwater quality seepage simulation experiment device and its use method, which relate to the field of groundwater hydrodynamic simulation and groundwater pollutant movement dynamics. The experimental device includes a sand box, a water supply device, and a water quality detection device. Front panel, rear panel and side panels, the front and rear panels are connected by the bottom plate, the first extension plate and the second extension plate are connected on both sides of the bottom plate, and the infiltration water receiving box is arranged under the bottom plate, and the infiltration water receiving box and the water quality detection device There are multiple slots on the inside of the front and rear panels, side slots on the left and right sides of the inside, side panels are placed in the side slots, and permeable stones are placed in the slots; electric telescopic rods and pushers are installed on the first extension board plate, the second extension plate is provided with an electric telescopic rod, a rotating motor and a rotating loosening rake, and the electric telescopic rod, the water quality detection device and the rotating motor are all connected to the controller. The experimental device adopts an assembled structure, which is conducive to improving and adjusting the device according to the actual situation.

The invention discloses a simulation device for three-dimensional solute transport in a porous medium and an experimental method. The simulation device comprises a sand tank, an injection mode adjusting device, a liquid supply device, a penetrating fluid collector, a water stop sheet, a well casing, a conductivity measuring electrode, a data collector and a data processing system. The sand tank ishorizontally placed, the interior of the sand tank is divided into three sub-chambers from left to right, the sub-chambers are separated through baffles, a plurality of water permeable holes are evenly and densely distributed in the baffles, the left chamber is connected with a liquid supply device, the middle sub-chamber is used for being filled with a porous medium, and the right chamber is vacant and connected with a penetrating fluid collector; the well pipes are evenly distributed in the porous media in the sand groove, dense water permeable holes are distributed in the side walls of theperipheries of the well pipes, and a conductivity measuring electrode is distributed in each cavity. The three-dimensional solute transport condition in the porous medium can be simulated and observed, and the influence of medium heterogeneity on pollutant transport can be explored.

The invention discloses a method for evaluating the migration characteristic of pollutants in a no-filling rough single fracture. The method concretely comprises the following steps: determining the kind and the dissolvability of the pollutants; establishing a rough single fracture model by using a fractal theory; establishing a no-filling rough single fracture value model based on a finite element technology; evaluating the migration process of the pollutants in the fracture by using a convection-dispersion equation for soluble pollutants; and evaluating the migration process of the pollutants in the fracture by using a level set technology for non-aqueous phase liquid pollutants. The method has the following advantages: 1, evaluation of the migration characteristic of the soluble pollutants in the fracture is realized; 2, evaluation of the migration characteristic of the non-aqueous phase liquid pollutants in the fracture is realized; and 3, migration parameters of the pollutants in the fracture, obtained in the invention, can be used as underground water pollution repairing base parameters.

The invention discloses a project scheduling and tidal river network pollutant transport process coupled numerical value simulation method. The method comprises the following steps of: establishing a tidal river network one-dimensional hydrodynamic force-water quality model; establishing a project application model to realize accurate and quantitative description of a project type and an application manner; solving the tidal river network one-dimensional hydrodynamic force-water quality model and the project application model by adoption of a finite difference format and a four-cascade solution; and establishing a gate pump group multi-target optimal scheduling model through aiming at targets of flood control, flood drainage and water quality improvement and project constraint conditions. According to the method disclosed by the invention, the accurate and quantitative description of interaction of a hydrodynamic process, a pollutant transport process and project scheduling is realized; and on the basis of simulating the project scheduling, the established gate pump group multi-target optimal scheduling model is utilized to obtain a gate pump group combined optimal scheduling scheme, so that the practical application value of the project scheduling simulation can be remarkably improved.

The invention discloses a method and system for determining the transport flux of pollutants in a sea area section, and relates to the field of pollutant diffusion in the sea area. The numerical simulation data of the tidal current is interpolated on the measuring points of the sea area section to be detected, and the water depth, flow velocity and flow direction corresponding to the measuring points are extracted; Average flow rate; Interpolate the data of marine pollutants at the measuring points of the sea area to be detected to determine the average concentration of pollutants between two adjacent measuring points; determine the transport channel of pollutants in the sea area to be detected according to the average flow and the average concentration of pollutants quantity. The invention can realize the detection of pollutant transport flux in the sea area with complex flow state.