سال انتشار: ۱۳۸۷

محل انتشار: همایش بین المللی ژئولیت ایران

تعداد صفحات: ۷

نویسنده(ها):

Zoheir Shokouh Saljoghi – Department of Fisheries and Environmental Sciences, Faculty of Natural Resources, University of Tehran, Karaj, Tehran, Iran.
Amir Shokouh Saljoghi – Department of Chemistry, Shahid Bahonar University of Kerman, Kerman, Iran
Ahmad Imani – Department of Fisheries and Environmental Sciences, Faculty of Natural Resources, University of Tehran, Karaj, Tehran, Iran.
Majid Bakhtyiari – Department of Fisheries and Environmental Sciences, Faculty of Natural Resources, University of Tehran, Karaj, Tehran, Iran.

چکیده:

Natural zeolites can have three major roles in aquaculture: (i) removing ammonia from ambient living
water; (ii) producing oxygen to aerate water bodies; (iii) as a filler included in feed. Systems capable of
removing undesired anions from wastewater effluents, even at extremely low concentrations, are a major
need in the industry. At the present study the natural zeolite was characterized using XRD and XRF analyses.
Modification was practiced with benzyl dimethyl tetradecyl ammonium chloride (BDTA) to increase the
adsorption of neothorin (on the zeolite), C10H11AsN2Na2O11S2, which subsequently increase ion exchange
capacity of zeolite per se. A cationic resin (sephadex®) was also applied. The effect of pH on the adsorption
of ions has also been evaluated. Result showed that clinoptilolite treated with BDTA was more efficient in
removing undesired ions from aquaculture wastewater. The selectivity sequences CrO4
2->SeO4
2->NO3
->SO4
2-
>NO2->PO4
3- and CrO4
2->SeO4
2- > SO4
2-> PO4
3-> NO3
-> NO2
– were determined for clinoptilolite and resin,
respectively. Results showed that modified zeolite had more capability to remove phosphorus, nitrite and
nitrate than resin (p< 0.05). The optimum range of pH for both zeolite and resin for ions CrO4
2-, SO4
2-, SeO4
2-
, PO4
3-, NO2
– and NO3
– were 6.5 – 7.5, 5.5 – ۷, ۵٫۸ – ۷٫۵, ۵٫۵ – ۷٫۲, ۵٫۵ – ۷ and 6 – ۷, respectively.
Concludingly, due to lower cost of zeolite and its ability to remove common toxic species, namely,
phosphorus, nitrite and nitrate, it is recommended for more detailed studies.