| Author | Shanmuganantha, Sivasubramaniam |
| Call Number | AIT Thesis no.EV-86-1 |
| Subject(s) | Sewage--Purification--Flocculation
|
| 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 | Most water treatment involves coagulation-flocculation process in the
removal of turbidity and color. The SIRIFLOC Process is a recently
developed coagulation-adsorption process where recoverable magnetite is
used as coagulant-adsorbent instead of conventional coagulants. The
SIROFLOC Process is being used in Australia, United Kingdom and Republic
of China as a successful alternative to conventional processes. The
applicability of SIROFLOC Process to waters of Chao Phrya River of
Thailand in removing turbidity and color was considered on a laboratory
scale in this study.
Several samples were jar-tested with pH, dosage of magnetite and dosage
of polyelectrolyte as controlling parameters to study the effect of the
above controlling parameters on the removal of turbidity and color.
Similar studies were performed simultaniously with alum instead of
magnetite as coagulant for comparison purposes.
Results indicated that with initial turbidities ranging from 25-160 NTU
and obtained during September 1985 - January 1986 period, SIROFLOC
Process produced effluents of turbidity and color less than 5 NTU and
5°Hazen respectively. The optimum conditions varied from sample f
sample. Removal of turbidity rather than removal of color governed such
optimum conditions. Dosages of magnetite from 0.5-1.5% w/w were found to
be sufficient. Dosage of cationic type polyelectrolyte in the range of
0 .25 -0.50 mg/l gave satisfactory results. pH closer to the natural pH
(about 7.0) was found to be quite appropriate. For initial turbidities
less than 48 NTU both alum and magnetite were equally effective but
beyond 48 NTU magnetite gained superiority over alum. Magnetite was
found to be superior to alum for initial color values greater than
15°Hazen. Regeneration of Magnetite was very effective. |
| Year | 1986 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Environmental Engineering and Management (EV) |
| Chairperson(s) | I, Fude |
| Examination Committee(s) | Shin, H.S. ;Hanaki, K. ;Fish, E.J. ;Wang, R.R. |
| Scholarship Donor(s) | NORAD, Norway |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 1986 |