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Microbiological and molecular evaluation of an alluvial water well field and fouling-related phenomena

dc.contributor.advisorKORBER, DARREN R.en_US
dc.contributor.advisorLAWRENCE, JOHN R.en_US
dc.contributor.committeeMemberHILL, JANETen_US
dc.contributor.committeeMemberWAISER, MARLEYen_US
dc.contributor.committeeMemberVUJANOVIC, VLADIMIRen_US
dc.contributor.committeeMemberTYLER, ROBERTen_US
dc.creatorMedihala, Prabhakaraen_US
dc.date.accessioned2013-01-03T22:31:50Z
dc.date.available2013-01-03T22:31:50Z
dc.date.created2012-06en_US
dc.date.issued2012-08-31en_US
dc.date.submittedJune 2012en_US
dc.description.abstractAn important source of water for the city of North Battleford, Saskatchewan is groundwater extracted from wells installed adjacent to the North Saskatchewan River. Unfortunately, these wells undergo fairly rapid deterioration (3-4 years) leading to reduced well capacity and water quality. The reasons for this deterioration are poorly understood. The studies in this thesis have tried to quantify the prevalence, activity and diversity of microbial populations in the aquifer and to explain the possible outcomes of microbial interaction with the environment which might lead to biofouling of the wells. A panel of conventional cultural, microscopic, metabolic and molecular techniques were utilized to analyze water, sediment and biofilm samples collected from various locations in the aquifer. The studies indicated that the aquifer was anoxic and harboured abundant concentrations of iron and manganese very close to the well and also presence of diverse groups of organisms including Fe-, Mn-, S-oxidizing bacteria as well as Fe-, Mn-, nitrite- and sulphate-reducing bacteria. A two year spatio-temporal study indicated that the biofilm growth significantly increased within the 1-2 m zone from the well and were also associated with a rapid reduction in specific capacity of the well. PCR, qPCR, and DGGE analyses indicated that the microbial community composition and diversity varied with space and time with greatest changes detected within the zone proximal to the well. Sequence data indicated that the major bacterial species prevalent in the aquifer belonged to Sulfuricurvum spp., Rhodobacter spp., Methylobacter spp., Acidovorax spp., and Geobacter spp. The studies demonstrated that water extraction influenced microbial community diversity, activity and composition, the effect of which did not extend beyond 1-2 m well radius. The application of impressed current did not demonstrate any anti-fouling effect, but rather favoured the growth of biofilm around the well and the accumulation of insoluble precipitates leading to accelerated deterioration of the well. Overall, the microbial community diversity, activity and composition in the study aquifer changed with respect to time and space, and water extraction. These changes altered the biogeochemical processes in the aquifer, especially within the zone closest to the wells leading to clogging and well deterioration.en_US
dc.identifier.urihttp://hdl.handle.net/10388/ETD-2012-06-504en_US
dc.language.isoengen_US
dc.subjectGroundwateren_US
dc.subjectBiofilmen_US
dc.subjectPumpingen_US
dc.subjectBiofoulingen_US
dc.subjectCloggingen_US
dc.subjectMicrobial communityen_US
dc.subjectDenaturing Gradient Gel Electrophoresis (DGGE)en_US
dc.subjectPrincipal Components Analysis (PCA)en_US
dc.subjectImpressed current.en_US
dc.titleMicrobiological and molecular evaluation of an alluvial water well field and fouling-related phenomenaen_US
dc.type.genreThesisen_US
dc.type.materialtexten_US
thesis.degree.departmentFood and Bioproduct Sciencesen_US
thesis.degree.disciplineApplied Microbiologyen_US
thesis.degree.grantorUniversity of Saskatchewanen_US
thesis.degree.levelDoctoralen_US
thesis.degree.nameDoctor of Philosophy (Ph.D.)en_US

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