Biodegradation Of Phenol And 4-Chlorophenol Mixture And Bioregeneration Of Binary Loaded Granular Activated Carbon By Different Types Of Acclimated Biomass

Simple item page
dc.contributor.authorVoon, Sui Yien
dc.date.accessioned2018-01-18T07:32:56Z
dc.date.available2018-01-18T07:32:56Z
dc.date.issued2017-08
dc.description.abstractIndustrial effluents mostly consist of mixture of multiple substrates and the complex interactions between these substrates could affect the performance of microbial community in both biodegradation and bioregeneration. Acclimating microorganism to the substrates could reduce the toxicity effect. However, acclimation to multiple substrates is a time-consuming process. Therefore, the objectives of this study were (i) to investigate the feasibility of different types of acclimated biomass in the biodegradation of binary phenol and 4-chlorophenol (4-CP) solution and the bioregeneration of binary loaded granular activated carbon (GAC), and (ii) to verify the possibility of replacing binary-acclimated biomass with different types of biomass which was acclimated to single substrate in biodegradation and bioregeneration. The biodegradation study revealed that phenol-acclimated biomass (PhAB) was able to biodegrade both phenol and 4-CP completely but did not fully mineralizing the phenolic compounds. On the other hand, the binary-acclimated biomass (BAB), 4-CPacclimated biomass (4CPAB) and the mixture of phenol- and 4-CP-acclimated biomass (MAB) proceeded to complete utilization and mineralization of both pollutants with BAB performing better than the other types of biomass. The increase in initial concentration of phenol to 4-CP (mg/L) from 100:100 to 300:300 decreased the phenol removal efficiencies and increased the time taken for complete removal of the phenolic compounds. The increase in biomass concentration from 300 to 500 mg/L increased the phenol removal efficiencies and shorten the complete substrates removal time. The time courses of the respective phenol and 4-CP residual concentrations at their various initial concentrations and 300 mg/L of biomass were obtained. It was observed that the efficiency of removing the substrates from the bulk solution decreased with the increase of initial substrates concentration. At higher concentration ratio of phenol and 4-CP (400:400) all biomass attained 100 % removal efficiency for either phenol or 4-CP. Despite achieving the highest total removal efficiency and shortest complete substrates removal time, the bioregeneration efficiency for BAB at any given concentration were the lowest ranging only from 42 ± 6 to 63 ± 6 %. The bioregeneration efficiencies of 4CPAB and the MAB were comparable to each other which were in the range of 52 ± 5 to 70 ± 2 %. The low bioregeneration efficiency of BAB was due to the higher fraction of irreversibly adsorbed 4-CP caused by longer contact time between 4-CP and GAC surface. In addition, the formation of biofilm on the surface of GAC obstructed the GAC pores and reduced the adsorption capacity of the regenerated GAC. Overall, MAB could be an alternative for BAB when the concentrations of the substrates were below its acclimation concentration in biodegradation and bioregeneration of phenol and 4-CP mixture.en_US
dc.identifier.urihttp://hdl.handle.net/123456789/5419
dc.language.isoenen_US
dc.publisherUniversiti Sains Malaysiaen_US
dc.subjectFeasibility of different types of acclimated biomass inen_US
dc.subjectthe biodegradation of binary phenol and 4-chlorophenolen_US
dc.titleBiodegradation Of Phenol And 4-Chlorophenol Mixture And Bioregeneration Of Binary Loaded Granular Activated Carbon By Different Types Of Acclimated Biomassen_US
dc.typeThesisen_US
Files
License bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
license.txt
Size:
1.71 KB
Format:
Item-specific license agreed upon to submission
Description:
Download
Collections
Pusat Pengajian Sains Kimia - Tesis