1 AIT Asian Institute of Technology

Ozone as disinfectant

AuthorTapas, Arturo L.
Call NumberAIT Thesis no. EV-88-2
Subject(s)Water--Purification--Ozonization
Ozone
NoteA thesis submitted in partial fulfilment of the requirement for the degree of Master of Engineering, School of Environment, Resources and Development
PublisherAsian Institute of Technology
AbstractFiltered (finished) water exhibits a considerable resistance to the buildup of ozone residual in a semi-batch ozonation. This is due to the rapid decomposition of ozone or high ozone demand at the start of ozonation. The Buildup of ozone residual after the breakthrough can be described by the formula C= a(1 - e-bt) + Coe-bt where C is the ozone residual at time t after the breakthrough, Co is the ozone residual just before the breakthrough, a and b are constants. The bactericidal efficiency of ozone is little affected by pH, ammonia, organic matter and nitrite . With respect to residual concentration, ozone is a more potent bactericide than chlorine. Ozone is able to attain a 99. 9% kill (initial number of coliforms 1061100 ml> in 12 min of contact time (semi-batch disinfection> at a final residual of 0. 2 mg/l in contrast to 1-4 mg/l initial residual and about 0. 5 mg/l final residual of chlorine (batch disinfection, initial number of coli forms 104>. Likewise, at the mentioned conditions, ozone can attain a 100% kill in 15 min; whereas, chlorine can not, even in 30 min of contact time. However, ozone has a serious disadvantage of not being able to maintain a persistent residual.
Year1988
TypeThesis
SchoolSchool of Environment, Resources, and Development (SERD)
DepartmentOther Field of Studies (No Department)
Academic Program/FoSEnvironmental Engineering (EV)
Chairperson(s)Samorn Muttamara
Examination Committee(s)Vigneswaran, Saravanamuthu ;Yamamoto, K.
Scholarship Donor(s)Federal Republic of Germany
DegreeThesis (M.Eng.) - Asian Institute of Technology, 1988


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