Pilot scale experimental investigation of membrane filtration for water and wastewater reuse | |
| Author | Suwanna Kitpati |
| Call Number | AIT Thesis no.EV-01-19 |
| Subject(s) | Water reuse Water--Purification--Membrane filtration |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Abstract | The increasing industrial production in Asia leads to over exploitation of water resources and discharge of significant pollution load. Water and wastewater reuse is the solution to conserve the fresh water resources of many countries. Membrane filtration is an advanced technology, which has been improving in design and decreasing in capital cost. It offers the superior quality water for reuse, than the conventional systems. Pilot scale microfiltration membrane experiments were conducted to investigate stability and reliability of surface water and treated wastewater treatment. Bench scale chemical cleaning experiments were carried out to study on effect of chemical composition and concentration. Finally, financial analysis and reuse potential were also discussed. These experimental results indicate that: a) Permeate flow and backwash method is the significant operating condition factors to prolong the duration time of running. b) Inorganic matters such as clay are not much effect to stability of membrane filtration, while organic matter is the significant factor for flux declined. c) Microfiltration system has a high ability to handle high turbidity and suspended solid loading but less effective for organic matters removal. Turbidity removal efficiency was 98-99 % and suspended solid removal efficiency was 100 %. In case of organic removal, COD removal efficiency for surface water and treated wastewater was 40-70 % and 65-80 %, respectively. d) The combination of caustic and oxidant is the most effective method for this particular surface water and treated wastewater. There is a threshold concentration for both chemical reagents, which the excessive concentration will not significantly improve in the flux recovery. The threshold concentration for NaClO was between 200-400 ppm for both feed water. Increase of NaOH concentration from 0.075 N to be 0.15 N was insignificant flux recovery improving for surface water but in case of treated wastewater; flux recovery improving was 20-25 %. e) This membrane filtration system was found to be an attractive economic alternative to conventional treatment process. Product water was better in quality and less in problem of disinfection-by-products and disinfection-resistant pathogens, than the conventional treatment process. The system has a potential to widely reuse in all application especially potable water and industrial activities reuse. |
| Year | 2001 |
| 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) | Annachhatre, Ajit P. ;Preeda Parkpian ;Lee, Seung-Hwan |
| Scholarship Donor(s) | Asian Institute of Technology-Partial Scholarship |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2001 |