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Evaluate the kinetic of Containment Removal and Improving the Effect of the Biological Factors on Membrane Bio Reactors and Fouling Problem

Seyedi, Mojtaba | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 46349 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Shaygan SaleK, Jalaloddin
  7. Abstract:
  8. In this study as representatives of alkenylbenzenes and mono-alkylbenzenes respectively were considered individually and as binary mixtures. It was observed that styrene, and ethyl benzene were inhibitory types of substrates across the tested concentration ranges. Thus, biodegradation kinetic is well described by the Haldane model. Kinetic parameter's assessments from single substrate degradation tests and these parameters were used to predict possibly interaction factors achieved from dual substrate experiments. The achieved outcomes from mixture of experiments revealed that the ratio of depletion for each substrate is affected by the presence of the other. It was also inferred that ethyl benzene plays an influential role on styrene consumption in comparison to styrene, which has an insignificant inhibitory effect on ethylbenzene usage. To achieve the most desirable fitness for the dual substrates, the Sum Kinetics with Interaction Parameters (SKIP) model and the purely competitive enzyme kinetics' model were employed. The SKIP model was found to accurately describe these interactions.
    Moreover, styrene and ethylbenzene removal from petrochemical wastewater using membrane bioreactor was investigated. Results showed that removal efficiency of COD, styrene and ethylbenzene in HRT=20 hours, are 98, 99 and 99 percent respectively. When HRT reduced to 15 hours the efficiency of COD, biological removal is only about 1 to 2 percent declined. The concentration of styrene and ethylbenzene in output air also about 1/0 ppm decreased. Besides, the TMP variation shows that the TMP tolerance in HRT=15 hours is more than HRT=20 hours. Evaluation of EPS and SMP revealed that due to reduction in the mount of HRT, although the EPS value reduced, the SMP concentration in the liquor was increased
  9. Keywords:
  10. Ethylbbenzen ; Kinetic Model ; Styrene ; Membrane Bioreactor ; Membrane Fouling

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