| Author | Ramjee, Subramanian |
| Call Number | AIT Thesis no. EV-97-42 |
| Subject(s) | Sewage--Purification--Ozonization
|
| 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-97-42 |
| Abstract | The efficiency of ozonation and chemical coagulation in the Color and COD removal
from wastewater of a pulp and paper mill was determined on a lab scale experimental set up.
Three. types of wastewater are used in the batch mode of operation and they are the effluent
after treatment, the chlorinated stage filtrate and the alkaline extraction stage filtrate streai;ns.
The pulp and paper effluents were investigated in both batch and continuous operation.
Ozonation is observed to achieve the highest removal efficiency in the color and COD
removal in the final effluents. More than 80% of color removal is achieved in 30 minutes of
ozonation time. The results also show that it is not that much effective in reducing the color
and COD of the chlorinated and alkaline extraction stage filtrates.
Chemical coagulation using alum (aluminium sulfate) is found to be effective means in
removal of COD and Color for the three types of effluents. The removal rate of 80% is
achieved in the decolorisation of the final effluents using alum as the coagulant. However, the
removal rate in the chlorinated and extraction stage filtrates is not as efficient as the final
effluent and more concentration of the chemical is required for coagulation.
The treatment efficiency for color and COD can be further enhanced· by the use of
combining two processes for the two highly colored streams, the chlorine bleaching and
alkaline extraction stage filtrates. These processes can provide a very effective means of dealing
with the pulp and paper mill wastewater.
The cost of ozone treatment is quite high for final effluents and is moderate for the
other two effluent streams. |
| Year | 1997 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. EV-97-42 |
| 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) | Samorn Muttamara |
| Examination Committee(s) | Visvanathan, Chettiyappan;
Malinen, Raimo O. |
| Scholarship Donor(s) | Asian Institute of Technology Partial Scholarship |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 1997 |