| Author | Amporn Kankanlaung |
| Call Number | AIT Thesis no.EV-98-27 |
| Subject(s) | Water--Purification--Ozonization
|
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of
Science, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Abstract | The presence of algal metabolite in surface water does not only create many problems
on coagulation and flocculation processes but creates the health-related problem also since
alga metabolite act as the trihalomethane precursors. Beside, it can produce taste and odor in
drinking water.
It is known that the trihalomethane precursor and producing taste and odor metabolite
can not be removed completely by conventional drinking water process. Using advanced
oxidation processes (AOP) to remove algal metabolite has become more popular since
hydroxy radical which has very high oxidation potential can be created from the advanced
oxidation processes.
This research study the capacity of hydrogen peroxide, ozone, and combined ozone
and hydrogen peroxide, peroxone, to mineralize the algal metabolite in surface water and
investigates the pH, ozone dose, mass ratio of Hi02/03 for removal alga metabolite which is
determined in term of removal of total organic carbon (TOC). The % molecular weight
distribution (MWD) in oxidized alga metabolite is also analyzed.
The result reveals that pH is the main parameter which affect to the TOC removal
efficiency. For using Hi02, the optimum pH is 5-6. For ozonation, the optimum pH is 9. The
best pH for the best oxidation capacity of peroxone is pH 7 and the optimum mass ratio of
Hi02/03 is 0.4 mg Hi02/ mg. 0 3.
For Hi02, it can remove TOC maximum only 15% within 10 min. when 1.44mg H20 2/
mg. TOC is used to treat AOM solution. Using 1.25 mg 0 3 I mg TOC can remove TOC 15%
within 20 min. at optimum ·pH and using 1.8 mg 03 I mg. TOC can remove TOC up to 20%
within 10 min and 30% within 20 min. Peroxone is the best for TOC removal. TOC can be
removed 50%, 70%, 80%, and 90% within 5, 10, 20, and 30 min. subsequently at the optimum
pH and treat with 0.72 mg. Hi0 2 (per mg. TOC) I 1.8 mg. 0 3 (per mg. TOC) (0.4mg. H20 2 I
mg. 0 3) which is the optimum ratio. |
| Year | 1998 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Department of Energy and Climate Change (Former title: Department of Energy, Environment, and Climate Change (DEECC)) |
| Academic Program/FoS | Environmental Engineering and Management (EV) |
| Chairperson(s) | Visvanathan, C.; |
| Examination Committee(s) | Samorn Muttamara ;Annachhatre, Ajit P. ; |
| Scholarship Donor(s) | Metropolitan Waterworks Authority; |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 1998 |