Optimizing design method of soil vapor extraction system

摘要

PURPOSE: An optimum design method for a soil vapor extraction system is provided to decide equipment to be used according to the distribution of pollution before an actual construction work by repeatedly performing simulations based on a spot data and to predict restoring time and cost. CONSTITUTION: An optimum design method for a soil vapor extraction system is composed of steps of evaluating urgent managing and relief strategies, researching the background of pollution and characteristics of the polluted ground, and estimating the degree of pollution(S31,S32); deciding if the degree of pollution is within a permitted limit of restriction standard and completing if the degree of pollution is in the permitted limit(S33); estimating the flow of air and the maximum concentration of vapor if getting out of the permitted limit, computing maximum removal rate, and then investigating the application of a construction method by comparing the maximum removal rate with a target removal rate(S34,S35); operating a vacuum pump after checking soil layers, installing a vapor extraction well, an observation well and a pneumatics observation well and deciding hydraulic conductivity and the flow rate of air by measuring the flow of air, pneumatics, and the concentration of vapor(S36,S37,S38); setting up an outline of an underground by using the present state of the ground, a geological section, a groundwater table and the extraction result of boring underground water and deciding optimum vapor extraction well water and position, based on the characteristics of aquifer including the composition of pollutant source, air permeability coefficient, and hydraulic conductivity(S39,S40); and installing equipment including surface seal, an underground water pumping system, and a vapor treatment system and accordingly computing cost(S41).