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2 2020

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The preliminary studies of application the algae Mougeotia sp. for the removal of synthetic dyes

100%

Zabłocka-Godlewska E. , Przystaś W. , Adamkowska M.

tom Vol. 27, nr 1-2

1--10

Biological methods of removal of synthetic dyes are cost effective and environmentally safe but still need improvement. The preliminary studies were focused on possibility of application of the freshwater algae Mougeotia sp. for the removal of synthetic dyes belonging to different chemical groups. Decolorization of water solutions of six dyes from four chemical groups were studied: azo – Evans blue (EB) and Congo red (CR); triphenylmethane (TPM) – brilliant green (BG) and crystal violet (CV); fluorone – bengal rose (BR) and anthraquinone – remazol brilliant blue R (RB). Dyes were used at three concentrations 0.005, 0.025 and 0.05 g/dm3. The best results of dyes removal were reached in case of both triphenylmethane dyes (BG and CV) and fluorone BR for all used dyes concentrations (97–100 %). Increase of azo dyes concentration was connected with the decrease of the removal efficiency (CR – 68–100 %; EB – 37–87 %). In case of the antraquinone RB the inverse effect was observed and the best removal results were reached at higher dye concentrations. Preliminary results point out the possibility of use Mougeotia sp. in processes of synthetic dyes removal, but further studies are required.

Isolation and screening of bacteria with ability to decolorize selected synthetic dyes - preliminary results

88%

Zabłocka-Godlewska E. , Przystaś W. , Godlewska M.

tom Vol. 13, no. 2

75--86

Commonly used synthetic dyes cause serious problems with their efficient removal from sewage. The bioaugmentation of sewage treatment systems with highly decolorizing bacteria may be a solution. The aim of the study was the screening of bacteria with high ability to remove synthetic dyes (brilliant green (BG), crystal violet (CV), erythrosine (Er). The bacteria were isolated from municipal sewage, compost and rotten beech wood. Mineral and nutrient solid growth media supplemented with dyes (BG or EB) at a concentration 0.1 gL-1 were used. At second stage of screening the liquid nutrient broth supplemented with one of dye (BG, CV or Er at concentration 0.1 gL-1) was used. The contents of dyes in samples (after 96 h) were measured spectrophotometrically. The largest number of decolorizers were obtained from wastewater, then from compost and the rotten wood. In the case of BG and CV even small differences in the structure of the molecules affect the results of dyes removal. The structurally simpler BG was definitely better removed than CV. The results of the removal of Er were worse than BG but better than CV. Bacteria isolated at mineral medium removed dyes with higher efficiency.