Sorption of Chromium (VI) Using Excess Municipal Sludge
| Autor: | Farzaneh Mohammadi, Hasti Hashemi nejad, Amir Taebi |
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| Jazyk: | English<br />Persian |
| Rok vydání: | 2014 |
| Předmět: | |
| Zdroj: | آب و فاضلاب, Vol 25, Iss 1, Pp 34-43 (2014) |
| Druh dokumentu: | article |
| ISSN: | 1024-5936 2383-0905 |
| Popis: | Removing or decreasing hexavalent Chromium from wastewater to the permitted levels is important due to its non-biodegradation, bioaccumulation, cancer-causing and toxic effects. In this study, biosorption of Cr(VI) from aqueous solutions by Excess Active Municipal Sludge was investigated as a function of initial Chromium (VI) concentration (in the range of 5-90 mg/l), initial pH (in the range of 2-8), agitation speed (in the range of 50-200 rpm), adsorbent dosage (in the range of 2-10 g/l) and agitation time (in the range of 5-480 min) in a batch system. The optimum conditions were found by full factorial design approach. The results showed that the equilibrium time for adsorbent is 120 minutes. Also, sorption data have a good fitness by Freundlich isotherm model and adsorption kinetic is adopted with pseudo-second order model. In batch studies, at optimum condition (90 mg/l initial concentration, pH 2, agitation speed 200 rpm and adsorbent dosage 4 g/l), the adsorption performance was about 96%; the maximum adsorption capacity was calculated about 41.69 mg of Cr/g of adsorbent. Overall, it can be concluded that Excess Active Municipal Sludge, has a good performance as a biological, biodegradable, abundant and low-cost adsorbent for the removal of Cr (VI) from aqueous solutions. |
| Databáze: | Directory of Open Access Journals |
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