najeeb fadhil abbas alnasrawy

In this work, the focus was done on the study of the transport and absorption of Iron metal (heavy metal) through various multiple porous media. A physical model of a laboratory system similar to the filters system was established consisting of a 4-meter pipe, each meter of which is placed in a specific type of soil, which are sandy, organic, calcareous and sandy gravel soil respectively. The characteristics and the adsorption of the media were tested and the pollutant was prepared and pumped as an aqueous solution through the physical model continuously for more than 50 hours. The results showed that the adsorption process and consequently the removal efficiency are higher in the first porous medium contained in the first part until the saturation is near. Then the second media begin to play the major role for the adsorption and the removal efficiency and so on for the third and fourth media respectively. The results also showed that the adsorption efficiency depends on the arrangement and type of the porous medium. The system of a multiple porous medias provides a very good technique to getting rid the heavy metals with a very low cost

Development of industries and agriculture, salts, especially sulfates, used in many industries, such as fertilizers and pesticides, have become one of the most common problems. In this paper, a laboratory model was established to study the sulfate-contaminated transport process. Four samples of porous media contain the same pollutant, sandy soil, sandy gravel soil, agricultural (organic) soil, and calcareous soil. Where a pollutant is pumped at a concentration of 280 mg/l through a system consisting of a tube of length 4 meters and 8 cm thickness and distributed in the soil Each type is one meter. The results showed that all types of soils, except organic, had leaching or loss of sulfates from the soil and dissolving them with a soil solution. The transfer of pollutants from soil to the solution may reach between 50 to 300 mg/l per meter, while organic soil showed the ability to Absorption up to 100 mg/L per meter. However, it was found that organic soil contains the largest amount of sulfate and was able to adsorption, and it was found that bacterial activity has a role in reducing sulfate in organic soil and thus returning the soil to adsorption after a certain time of saturation process.

The huge industrial development that has taken place in recent decades and what it poses of large amounts of pollutants to the soil and the natural processes that occur in the migration of some pollutants such as oil and others in the soil have become one of the biggest pollution problems and thus the problem of obtaining information to find solutions has become more complex. This research was carried out to develop a CFD simulation model for simulating the transmission of contaminants via soil's multi-porous medium Consisting of four real porous media used from Iraqi soil, representing the sand, sandy gravel, organic, and calcareous soil. To explore the process of transferring pollutants inside the porous medium, a physical model and simulation model were built and executed with the aid of CFD programs using COMSOL 5.4 software to investigate the transport of pollutants via porous material. Several categories of variables were studied and assumed to analyze the situation. The first group is interested in the media's physical qualities, such as the coefficient of adoption Kd while the hydraulic component of flow, such as velocity, was represented by the second group. To adopt the CFD simulated model in obtaining the required results, it is necessary to check the results of the CFD simulated model with its counterparts obtained from the physical model that was prepared for this purpose. Therefore, according to numerous statistical indicators, the results of the laboratory work supplied by the physical model and those of the CFD model were in excellent accord. This suggests that CFD models might be a useful tool for simulating the complicated challenges of contaminant transport across porous media. It is also considered a tool with effort, time, and low cost