Document Details

Document Type : Thesis 
Document Title :
Microbial Degradation of Chloroxylenol Compound
التحلل الميكروبي لمركب الكلوروكسيلينول
 
Subject : biological sciences department 
Document Language : Arabic 
Abstract : Chloroxylenol is a very toxic phenolic derivative and it represents potential hazard towards human health and to the environment. Six locally isolated fungi of Aspergillus niger, A.terreus, A.versicolor, Penicillium rubrum, P.corylophilum and Emericella nidulans were isolated from hydrocarbons polluted soils and they were tested for their ability to degrade chloroxylenol. Aspergillus niger, local isolate, is an efficient fungus to degrade 99.72% of 2 mg/L of chloroxylenol after 7days of fermentation. It also has high capacity to degrade 91.83% of higher chloroxylenol concentration of 20mg/L after 6 days of incubation on mineral medium amended with 2 g/L of glucose. Statistical experimental designs were used to optimize the process of chloroxylenol degradation by the fungus. The most important factors influencing chloroxylenol degradation, as identified by a two-level Plackett-Burman design with 11 variables, were NaCl, (NH4)2SO4, and inoculums size. Response surface analysis was adopted to further investigate the mutual interactions between these variables and to identify their optimal values that would generate maximum chloroxylenol degradation. Under the optimized medium compositions and culture conditions, A.niger completely degraded (100%) chloroxylenol (20 mg/L) after 134.6 hr of fermentation. The predicted values of Plackett-Burman conditions and response surface methodology were further verified by validation experiments. The excellent correlation between predicted and experimental values confirmed the validity and practicability of this statistical optimum strategy. Optimal conditions obtained in this work laid to a solid foundation for further use of A.niger in treatment of high strength chloroxylenol polluted effluents. So, the optimized conditions were applied to bioremediate crude sewage containing 27.8 mg/L of chloroxylenol by A.niger. The fungus efficiently degraded chloroxylenol after 8 days of fermentation. 
Supervisor : prof. Khaled M. Ghanem 
Thesis Type : Master Thesis 
Publishing Year : 1433 AH
2012 AD 
Added Date : Monday, June 4, 2012 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
نهى منصور الحازميAl-Hazmi, Nuha MansourResearcherMaster 

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