| Author | Nilapha Paemanee |
| Call Number | AIT Thesis no. EV-97-28 |
| Subject(s) | Sewage--Purification--Microstraining
|
| 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 |
| Series Statement | Thesis ; no. EV-97-28 |
| Abstract | The efficiencies of four type ultrafiltration membrane, fluoro polymer (FS) of MWCO
20,000 and 10,000 dalton and polysulphone (GR) of MWCO 10,000 and 5,000 dalton were
used for the removal of lignin which has a wide range of molecular weight and are main reason
to make a high COD and color in wastewater from pulping process. The efficiency of lignin
separation using four different ultrafiltration membranes, namely fluoro polymer (FS) of
MWCO 20,000 and 10,000 dalton and Polysulphone (GR) of MWCO 10,000 and 5,000 were
experimentally studies. The raw wastewater contain lignin was obtained from three different
pulping processes; black liquor, chlorine bleaching, and caustic extraction (EOP bleaching). The
experimental runs were conducted within a temperature range of 40-60°C and transmembrane
pressure were varied from 5. 0 -3. 0 bar for FS61 while the transmembrane were reduced from
4.0-2.5 bar for others. It indicated that besides the higher transmembrane pressure resulted
higher contaminants removal efficiencies such as COD, TDS, Color and Lignin, the potential of
ultrafiltration membrane to remove contaminants were affected by membrane molecular weight
cut off and type of ultrafiltration membrane. High MWCO ultrafiltration membrane resulted in
low contaminant removal efficiency and FS has higher removal efficiency than GR, but were
independent of the operating temperature from 40°, to 60°C range.
Ultrafiltration of black liquor resulted in moderate removals of COD about 25-65%,
depending in transmembrane pressure and MWCO of ultrafiltration membrane whereas it has a
good removal efficiencies of Lignin and Color about 40-80 %. COD removal of Ch and EOP
bleaching wastewater were 20-60%. Removal of Color and Lignin of EOP bleaching
wastewater were 30-60% while resulted in poor removal of Color and Lignin of Ch bleaching
wastewater (10-45%). However, ultrafiltration of all pulping wastewater streams used has poor
removal ofTDS (10-40%). |
| Year | 1997 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. EV-97-28 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Environmental Engineering (EV) |
| Chairperson(s) | Visvanathan, C. |
| Examination Committee(s) | Annachhatre, Ajit P.;Malinen, Raimo O. |
| Scholarship Donor(s) | Electricity Generating Authority of Thailand (EGAT) |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 1997 |