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Treatment of Colored Food Industrial Wastewater by Biological Method (Molasses Wastewater)

Ghaffaripour, Niloofar | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 46102 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Alemzadeh, Iran; Vosoughi, Manoochehr
  7. Abstract:
  8. Disposal of molasses wastewater of Alcohol production and sugar refinery plants into water resources make irreparable damages to the environment. Continuous disposal of this wastewater causes decreases soil quality and destroys agricultural products. Wastewater which is produced from molasses alcoholic fermentation causes numerous environmental issues due to the dark color and high level of organic compounds. Most of these organic compounds can be eliminated by aerobic or anaerobic biological treatments. Nevertheless, the color which is due to the presence of heavy organic compounds, named melanoidin, in wastewater is hardly removed by conventional biological treatments. In this project, the possibility of removing the color of molasses wastewater by white rot fungus, phanerochaete chrysosporium, and also the role of enzymatic system in degradation of brown pigments was studied. Phanerochaete chrysosporium has an enzymatic system which consists of oxidative enzymes, lignin peroxidase and manganese peroxides that catalyze lignin and woody materials degradation. Due to Structural similarity of organic pollutants and lignin, this fungi is used in waste elimination. In this research, 59% color removal and 43% COD removal was achieved after five days incubation free cells in shaker incubator. Furthermore, color and COD removal percentage is increased to 80% and 77% respectively by immobilization of fungus on Kaldnes carrier in fixed bed bioreactor. In this research, the role of some culture’s compounds in reduction of pollutants was studied in order to prevent adding chemicals which don't affect the treatment process so much
  9. Keywords:
  10. Molasses ; Melanoidin ; Kaldness Miliotechnique (KMT)Packing ; Phanerochaete Chrysosporium ; Ligninolytic Enzymes

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