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Application of zeolites in removal of hazardous metal ions from drilling mud wastewater

Borowski Gabriel, Kujawska Justyna, Wasąg Henryk

Physicochemical Problems of Mineral Processing

2019

Vol. 55, iss. 6

1467--1474

In this study, the adsorption behavior of natural and activated zeolites with respect to Cd2+, Cr3+, Pb2+and Zn2+, was studied in order to consider theirabilityto remove hazardousmetals fromdrilling mud. The batch method was employed, using initial metal concentrations in solution in the range of0.1 to 2.5 mg/dm3. It was determined that independently of the concentration, the adsorption ratios of zeolite towardsmetal cations match the Langmuir and Freundlich isotherms. The results of the research on the reduction of concentration of hazardousmetals from drilling mud wastewater by means of natural and activated zeoliteswere presented in the further part of this work. Natural and activated zeolites were introduced in portions (from 0.2to 10 g) to 100 cm3of wastewater; then, the content of metalions was determined using an inductively coupled plasma spectrometer. The experimental data showed that the applicationof activated zeolite enabled the removal rate of Cr3+, Pb2+, Zn2+and Cd2+close to 93%, 45%, 56% and 84%, respectively. In the case of the natural zeolite, the degree of hazardousmetals removal was lower by only a few percent, but still high enough to beinteresting from the practical point of view. Satisfactory effects of hazardousmetal ionsremoval from drilling muds were achieved using 2 to 5 g of zeolite. The obtained results proved that the natural zeolite constitutes an important material for efficient removal of hazardousmetalionsfrom drilling mud wastewater.