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UM E-Theses Collection (澳門大學電子學位論文庫)

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Title

Combined removal of BTEX/cis-DCE/TCE/MTBE mixture from contaminated water using microorganisms immobilized on scrap tyres

English Abstract

Monoaromatic hydrocarbons, chlorinated aliphatic hydrocarbons, and methyl tert-butyl ether are the major pollutants presented in the aqueous environment as a result of their widespread anthropogenic use. The co-contamination of BTEX, MTBE, cis-DCE, and TCE allows the application of combined remediation techniques to achieve the simultaneous mineralization of all the compounds. Waste scrap tyres are considered as a major environmental concern due to the leakage of harmful compounds and their recalcitrant nature. Recycle of waste scrap tyres for environmental issue has rising a great attention recently. Several studies have been carried out to investigate the possibility of the directly use of waste scrap tyres as the adsorbent and immobilization matrix to remove volatile organic compounds. Bench scale laboratory experiments were set up to evaluate the physical and biological methods to remove the mixture with BTEX, CAHs, and MTBE. Adsorption process were carried by using waste scrap tyres and the effect of experimental parameters such as the contact time, pH, and initial VOC (volatile organic compound) concentration were investigated to optimize the conditions to enhance the removal efficiency of all the contaminants. The related kinetics and mechanisms of the adsorption process by scrap tyre were studied by using different isotherms and models. The aerobic simultaneous bioremoval from artificially contaminated water, present in mixture, was studied by using Pseudomonas plecoglossicida, an indigenous isolate, immobilized onto the waste scrap tyres. Suspended and immobilized conditions were compared for the enhanced removal of these volatile iv organic compounds. In the immobilized cell system, compared to the suspended system, the isolate grew better showing a significantly higher colony forming units (CFUs), utilizing BTEX as the growth substrate. Also, for the immobilized system, the removal efficiency of each compound was significantly higher compared to the suspended system, indicating the scrap tyres can be a great immobilization matrix. The determination of intermediate products and desorption experiments confirmed that the bioremediation play an important role in the combined process. Overall, waste scrap tyres showed a good capability for the simultaneous sorption and bioremoval of BTEX/MTBE/cis-DCE/TCE mixture, implying a promising waste material for the removal of contaminants mixture from industrial wastewater or contaminated groundwater.

Issue date

2016.

Author

Lu, Qi Hong

Faculty
Faculty of Science and Technology
Department
Department of Civil and Environmental Engineering
Degree

Ph.D.

Subject

Water -- Purification

Biodegradation

Waste tires

Supervisor

Shim, Hojae

Files In This Item

Full-text (Internet)

Location
1/F Zone C
Library URL
991001888839706306