Thesis - faculty.ait.ac.th - Asian Institute of Technology

MBR system should be explained the behavior of the accumulated soluble organic
compounds. In addition, for better understanding of the characteristics of organic
substances in MBR, the molecular weight distribution (MWD) and its compositions
should be analyzed to investigate the transformation of organic substances.
3. It is well known that landfill leachate, containing non-biodegradable and toxic
organic compounds caused important environmental problems. Thus, the degradation
of refractory organic compounds before and after treatments should be further
studied in terms of the degradation of some substances such as the degradation of
polycyclic aromatic hydrocarbons (PAHs), BTEX, aromatic hydrocarbon, aromatic
ketone.
4. Landfill leachate is a complex wastewater with considerable variation in both quality
and quantity. The characteristics of leachate, particularly in terms of biodegradability,
change as a landfill ages; it is difficult to treat leachate from a medium site and an
old site using a one-stage membrane bioreactor (MBR). Based on our encouraging
results, the treated leachate nevertheless still contains the refractory organic
compounds, which are difficult to degrade. Therefore, further research should be
performed on an advanced treatment such as nanofiltration, electrochemical
oxidation, or photoassisted fenton methods to treat the recalcitrant organic substances.
These methods might elevate the water quality of the final effluent to meet the
present effluent standard. In addition, for better understanding of the characteristics
of organic substances in treated leachate, the MWD and its compositions should be
analyzed to indicate the extent of organic removal in each fraction with HPLC, LC-
MS for all treatments.
5. There is a problem regarding foaming in the MBR system due to inadequate dosage
of antifoam chemicals. This should be controlled by using a peristaltic pump.
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