Laboratory scale studies for treatment of solid waste landfill leachate using cross flow microfiltration and ozone | |
| Author | Babel, Sandhya |
| Call Number | AIT Thesis no.EV-93-16 |
| Subject(s) | Sanitary landfills--Leaching Refuse and refuse disposal |
| Note | A thesis submitted in partial fulfillment of the requirement for the degree of Master of Science |
| Publisher | Asian Institute of Technology |
| Abstract | Laboratory scale experiments were conducted for the treatment of landfill leachate using crossflow microfiltration (CFMF) with periodic backflush as de-clogging technique. Single channel tubular ceramic membranes of pore size 0.2 and 1.2 micron were used in this study. Either powder activated carbon (PAC) or alum was used to treat the leachate before passing through the CFMF. The filtrate obtained from CFMF was treated by the ozone. The analysis of leachate from On-nooch site, used in this study, revealed that it is highly colored and has a COD of about 4700 mg/L. Results showed that the permeate flux increases with the increased close of PAC added to the leachate. The membrane of 0.2 micron pore size produced higher flux compared to 1.2 micron for both with and without the addition of PAC. The settling of PAC, if allowed before filtration, gave lower flux in comparison to the flux obtained when mixture was passed directly without settling. The membrane of 0.2 micron alone was capable of reducing 77.7 % of color and 62.3 % of COD but the permeate flux reduced with the time. When PAC was added, not only a higher and stable flux was obtained but also the removal efficiency was increased. When different pore size membrane were compared, the 0.2 micron membrane performed better than 1.2 micron membrane as it gave higher flux as well as better removal efficiency. Ozonation of the filtrate obtained from CFMF was helpful in removing the color and not much change in COD was observed. The effluent standards for color could be met after 60 minute of ozonation. A lower permeate flux was obtained when the leachate was flocculated by alum and the settled mixture was passed through 0.2 micron membrane as compared to the flux obtained when raw leachate was passed. A color removal of 92 % was observed after flocculation with alum with no further removal by CFMF but the COD removal was significant by the membrane. Direct ozonation of raw leachate required a long contact time for the significant removal of the color. Again, not much effect on COD removal was observed. This indicates that ozone, a strong oxidizing agent, should be used in combination with other treatment techniques. |
| Year | 1993 |
| 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) | Samorn Muttamara;Visvanathan, C.; |
| Examination Committee(s) | Sompol Boonthanon;Mora, J.C.; |
| Scholarship Donor(s) | Norwegian Government; |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 1993 |