| Author | Panalee Chevakidagarn |
| Call Number | AIT Thesis no.EV-96-26 |
| Subject(s) | Ultrafiltration
|
| Note | A thesis submitted in partial fulfillment of the requirement for the degree
of Master of Engineering |
| Publisher | Asian Institute of Technology |
| Abstract | The main problem in conventional surface water treatment is the removal of natural
organic matter, acted as disinfection by-product precursors. Membrane filtration processes
such as Microfiltration (MF) and Ultrafiltration (UF) are considered as the alternative
filtration technology to solve this problem. But from data analysis, MF with pore size 0.1 μm
and UF with MWCO level 50000 are not the effective systems in term of steep flux decline
and removal deficiency.
In this research, the use of low-pressure hollow fiber UF with low molecular weight
cut-off level 6000 and 4000 (UF6000 and UF4000) were evaluated in laboratory scale
experiments for natural surface treatment. Effect of turbidity, ultraviolet adsorptive
compounds and backwashing frequency upon flux and removal efficiency of UF6000 and
UF4000 were investigated. It is found that the effect of soluble organic components (E260
sensitive) upon flux decline is more important than the effect of turbidity. However, at steady
stage, by without any pretreatment, variation of both organic concentration and turbidity did
not affect flux decline and removal efficiency in UF6000 with and without backwashing.
Permeate water quality from UF6000 and UF4000 is as good as product water from Rapid
Sand Filter in conventional water treatment plant. Based on the results obtained above, pore
diameter reduction model by integral and differential expression were presented to predict the
cumulative volume and average flux of filtrate at any time.
Finally, by treatability evaluation, UF with low molecular weight cut-off can remove
smaller molecular weight impurities by probabilistic mechanism. |
| Year | 1996 |
| 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) | Kamei, Tasuku; |
| Examination Committee(s) | Chongrak Polprasert;Visvanathan, C.; |
| Scholarship Donor(s) | Royal Thai Government; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1996 |