Heavy Metals Adsorption Characteristics of Natural Zeolites

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Nearly 70% of agricultural lands in Tehran are irrigated with wastewater. Industrial wastewater contains a variety of inorganic pollutants such as heavy metals that make pollution to soil, water, and plant. Methods to remove heavy metals from industrial wastewater are not so effective or they are costly. In this study, three kind of natural Zeolites with four different sizes have been used to investigate their adsorption characteristics on five types of important heavy metals. The result shows that the Firouzkoh Zeolite adsorbs heavy metals more than the others. The adsorption efficiency increases with decreasing size. The effect of retention time on adsorption ratio shows that 80% of the Pb is adsorbed by Zeolite during early 70 minutes.

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