Application of Sulfur Degrading Bacteria in Bioremediation

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Ghaffari, Leila | 2016

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 48085 (06)
University: Sharif University of Technology
Department: Chemical and Petroleum Engineering
Advisor(s): Kariminia, Hamid Reza
Abstract:
The main objective of this research was to evaluate the application of a new strain of Brevundimonas naejangsanensis which is newly identified sulfate-reducing bacteria (SRB), in bioremediation. A laboratory scale packed bed reactor (PBR) was fabricated and operated to study the new bacteria’s feasibility on SO_4^(2-) reduction. The reactor was packed with polyurethane foam cubes and operated under different feeding and operating conditions of HRT, COD/SO_4^(2-) ratio and salinity. A maximum SO_4^(2-) reduction of 73.6% was achieved in the PBR when operated at an HRT of 12 h with SO_4^(2-) concentration of 670 mg/L, COD/SO_4^(2-) ratio of 1 and salinity of 3%. The results show that this bacteria is halophilic and reduces SO_4^(2-) to sulfide (65%), sulfite (2%) and thiosulfate (3%). Although there is not any appropriate method for measuring elemental sulfur, the yellowish observed sediments in the reactor proves its existence which is most probably the rest 30% of the products
Keywords:
Sulfate Removal ; Sulfate Reduction Bacterias ; Pollution Removal ; Packed bed Reactor (PBR) ; Chemical Oxygen Demand/Sulfate ; Salinity

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