Control of membrane fouling due to manganese in drinking water treatment | |
| Author | Fu, Lei |
| Call Number | AIT Thesis no.EV-97-17 |
| Subject(s) | Drinking water--Purification Water--Purification--Membrane filtration |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering |
| Publisher | Asian Institute of Technology |
| Abstract | Membrane filtration processes can produce high quality drinking water. The current problem, however, is membrane fouling. Manganese has been shown to be a main factor causing membrane fouling in drinking water treatment. This research aims to evaluate the possible control mechanisms of manganese fouling. Pretreatment and backwashing were proposed as two tools to control membrane fouling. Dead-end filtration was carried out under constant filtration flux (0.5 m/d) using hollow fiber MF membrane in this study. The influent, which was from AIT tap water spiked with manganese and free chlorine was provided in the experiment. In order to investigate the effect of pretreatment, three runs (Run 1, Run 2 and Run 3) were conducted under different feed concentrations of manganese and chlorine. The result revealed that the pretreatment with media absorption had an efficiency on membrane fouling control. TMP (Trans-Membrane Pressure) in membrane filtration with pretreatment increased very slow compared with the control experiment, because most manganese was captured by media filled in pretreatment reactor. The color of membrane with pretreatment became light yellow, but the other one without pretreatment turned brown at the end of each run. Two runs (Run 4 and Run 5) with different backwashing frequency were conducted. Backwashing was not effective on membrane fouling control in this experiment. The color of two membranes with backwashing and without backwashing appeared the same after the operation and TMP increased at the almost identical rate in both membrane filtrations. ยท This research also investigated the relationship between TMP and manganese attached on the membrane surface to further reveal the factor affecting membrane fouling caused by manganese. It was found that TMP increased rapidly after chemical washing using 1 % citric acid due to incomplete rinse and re-attached of insoluble manganese, and residual manganese attached on the membrane surface. |
| Year | 1997 |
| 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) | Takizawa, Satoshi; |
| Examination Committee(s) | Ishibashi, Yoshinobu ;Visvanathan, C.; |
| Scholarship Donor(s) | Asian Institute of Technology Partial Scholarship; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1997 |