عنوان مقاله [English]
The Arak Meighan wetland, is one of the important habitats of migratory birds that has faced serious challenges in recent years due to its various reasons. In this study, the status of heavy metals entering the Meighan wetland and solutions to reduce them was investigated. At first, an ICP test was conducted to determine the status of heavy metals entering the wetland. Then, three treatments of anionic resin, Clinoptilolite zeolite and Perlite with two repetitions were used to investigate the reduction of heavy metals (Pb, Ni and Cr). For this purpose, a series of columns with a height of one meter and a diameter of 160 mm were used. On the pipes, absorbent material were filled up to a height of 70 cm and artificial wastewater was entered into each of the test columns. Then sampling were taken at five minutes, 30 minutes, one hour, two hours, and four hours from the inlet and outlet of pipes. The samples were transferred to the laboratory and the values of heavy metals were measured with the atomic absorption device. The results showed in most of the experimental columns, the adsorption process had an upward trend at the beginning and a slow and even decreasing trend at the end of experiment. Also, the absorption rate of all three heavy metals in the resin is higher than the other two adsorbents and is about 90%. The highest percentage of adsorption for zeolite was 44% and for Perlite was about 30%. However, in the absorption of heavy metals, the performance of the treatments was different, but it seems all treatments have a relative efficiency in removing heavy metals.