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Chromium biosorption by the algal biomass Sargassum sp
2000 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The main aim with this work was to study the behaviour of the Sargassum sp as a biological resin for the accumulation of chromium with as low chemical interference allowable in order to make the biomass as cost efficient and easy to treat as possible. The work was divided into two parts, primary treatment and secondary treatment, where the primary treatment is about reducing the concentration of CrVI as much as possible into Cr3+ and precipitating the formed Cr3+. The remaining Cr3+ that did not precipitate would go to the secondary treatment. The primary treatment was highly effective, the initial concentration of CrVI in the g/l-range was reduced to <1 ppm. the formed cr3+ precipitated to cr(oh)3 where the cr3+ that did not precipitate was in the ppm-range and was treated by the secondary test. in the secondary test, two types of chromium containing effluents were used, a synthetic effluent and an effluent representing the real case, called ”real effluent”. different initial concentrations of cr3+ were used. the biomass used was pre-treated in two ways, one half was washed with distilled water and the other half in 5 %v./v. h2so4, in order to study the different behaviours, batch tests were used. the results in this study show a difference in the chromium uptake. it is much more efficient for the case of the biomass washed with distilled water. the maximum chromium removal reached was 87 %, whereas for the acid washed biomass the highest removal was 75 % (this being dependent on the initial concentration of chromium). in both cases the synthetic solution was used. for the “real” effluent case the highest removal was 85 % (biomass washed with distilled water) and for the acid washed biomass the highest removal was 51 %. desorption studies were also made in order to study if the biomass can be reused. the highest yield was 26 %, for the biomass that had been pre-treated with 5 % v.v. h2so4.with the method used the yield was very low and unsatisfactory. the microscopical study shows how the structure of the alga has been affected by the different treatments. this study shows that the sargassum sp is a good alternative for use as a biomass, however, with this approach it does not fulfil the criteria of absorbing 100 mg me/g , optimising and further research is needed.

Place, publisher, year, edition, pages
Keyword [en]
Technology, biomass, biological resins, chronium, destilled water, Sargassum
Keyword [sv]
URN: urn:nbn:se:ltu:diva-54029ISRN: LTU-EX--00/220--SELocal ID: b01db378-df93-4ae6-8fe9-39d0d4b2206eOAI: diva2:1027408
Subject / course
Student thesis, at least 30 credits
Educational program
Chemical Engineering, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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