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Title: NATURAL AND ACTIVATED ZEOLITES AS EFFECTIVE ADSORBENTS IN DRINKING WATER AND WASTEWATER TREATMENT
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NATURAL AND ACTIVATED ZEOLITES AS EFFECTIVE ADSORBENTS IN DRINKING WATER AND WASTEWATER TREATMENT
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1314-2704
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English
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20
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3.1
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Recently, zeolites have attracted a significant interest due to their potential use in a wide range of applications related to water treatment and environmental remediation. The chemical and thermal treatments are the most used approaches to improve the zeolites properties by enhancement of sorption properties, surface area and porosity. Chemical (2M NaCl), thermal (150 °C for 24 h) and thermo-chemical (2M NaCl, 150 °C for 24 h) activation methods for a natural clinoptilolite based zeolite originated from Romania were tested in order to find the optimal activation conditions that allow the simultaneous removal of ammonium (NH4+) and hydrogen sulphide (H2S). The changes in the zeolite?s structure determined by the activation were investigated by X-ray diffraction (XRD) and Fourier-transform infrared spectrometry (FTIR). The main mineral constituents of used natural zeolite were clinoptilolite, quartz, muscovite and albite. The influence of the activation process on the performance of zeolite was assessed by cation exchange capacity (CEC) and removal efficiency of NH4+ and H2S from drinking and waste waters. The chemical and thermal treatments do not produce significant structural changes detectable by XRD. The FT-IR spectra show that the zeolites structure did not change by the applied activation treatments. The CEC had the highest value for thermo-chemical activated zeolite (1.29 mEq/100g) and the lowest value for the natural one (0.89 mEq/100g). 5 g of activated and natural zeolite were added to 250 mL of drinking water spiked with 0.5 mg/L NH4+ and 0.5 mg/L H2S and waste water spiked with 3.2 mg/L NH4+ and 2.5 mg/L H2S, and maintained in suspension during 7 days, at room temperature. Samples were drawn for analysis at each 24 h. The results showed that thermally activated zeolite had the highest removal efficiency both for NH4+ (77% removal efficiency, after 48 h) and H2S (87%, after 72 h). The chemical activated zeolite had the lowest efficiency both for NH4+ (54.9%, after 48 h) and H2S (48.4%, after 2 h). The NH4+ retained by the zeolite start to be released after 3 days.
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conference
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20th International Multidisciplinary Scientific GeoConference SGEM 2020
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20th International Multidisciplinary Scientific GeoConference SGEM 2020, 18 - 24 August, 2020
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Proceedings Paper
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STEF92 Technology
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International Multidisciplinary Scientific GeoConference-SGEM
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SWS Scholarly Society; Acad Sci Czech Republ; Latvian Acad Sci; Polish Acad Sci; Russian Acad Sci; Serbian Acad Sci & Arts; Natl Acad Sci Ukraine; Natl Acad Sci Armenia; Sci Council Japan; European Acad Sci, Arts & Letters; Acad Fine Arts Zagreb Croatia; C
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281-288
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18 - 24 August, 2020
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website
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cdrom
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7132
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natural zeolite; activation; ammonium and hydrogen sulphide removal; drinking water; waste water
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