1 AIT Asian Institute of Technology

Removal of pathogenic microorganisms in the domestic wastewater with aerobic biofilm reactor

AuthorTawan Limpiyakorn
Call NumberAIT Thesis no. WM-00-23
Subject(s)Sewage--Purification--Biological treatment
NoteA thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Engineering and Technology
PublisherAsian Institute of Technology
AbstractDomestic wastewater probably contains high amounts of pathogenic microorganisms. Releasing of wastewater to the natural water systems can cause waterborne outbreaks. Small wastewater treatment system is suitable and necessary for an area where sewer system or central wastewater treatment plant is impossible. Aerobic attached-growth reactor was previously studied for the efficiency in eliminating organic matter. This study was carried out to investigate a role of small wastewater treatment system in protecting waterborne diseases. At the beginning, biofilm was developed in reactors by prepared synthetic wastewater. The experiments were conducted after a steady state indicated by COD removal. Domestic wastewater was used as a source of coliform organisms. The system has the ability of 89.81 % in removing fecal coliform from domestic wastewater. Higher amount of fecal coliform was removed in the lower half of column. Because in sorption experiment, biological media adsorbed small amount of coliform organisms, straining is expected to be an important mechanism in removing fecal coliform in the reactor. From fate experiment, fecal coliform can stay several days in the reactor with the reduction rate constant of 0.137 day" 1 • Although aerobic attached-growth reactor was effective to eliminate organic matter in domestic wastewater, a role of the system in protecting waterborne diseases was not completely successful. Eighty ninth percent of fecal coliform removal is not enough to meet an acceptable level. Effluent has to be carefully considered for uses and applications in the further steps.
Year2001
TypeThesis
SchoolSchool of Engineering and Technology (SET)
DepartmentDepartment of Civil and Infrastucture Engineering (DCIE)
Academic Program/FoSWater Engineering and Management (WM)
Chairperson(s)Chongrak Polprasert ;Fukushi, Kensuke
Examination Committee(s) Trankler, Josef
Scholarship Donor(s)DAAD Partial Scholarship, Germany
DegreeThesis (M.Eng.) - Asian Institute of Technology, 2001


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