Tow researches were talking about treatment wastewater from oil and color when the experiment condition change.
First Research (Removal of color from molasses wastewater using membrane bioreactor with extremely acidic condition)
The aim of this study is to show the advantage of extremely acidic operation below pH of 3 in membrane bioreactors (MBRs) for the treatment of molasses wastewater. The reactors with 5 liters of volume were operated with hydraulic retention time (HRT) of 5.48 days in average. In the first period of the experiment, biological pretreatment process was introduced and the reactor was operated with lower influent COD. Diluted molasses was directly fed to the MBRs without pretreatment in the second period. The membranes used in this study were made of polytetrafluoroethylene with pore size of 0.45 μm. The effect of pH on the removal of COD and color was examined for 91 days. COD removal in the first period was 48.5% for the acidic reactor and 63.6% for the neutral pH reactor. A higher removal of COD up to 89.0% was observed in the second period for the neutral pH reactor compared with 84.0% in the case of the acidic reactor, while a better color removal was observed for the acidic reactor judging for the measurement of absorbance at 390 nm and 475 nm. More density of fungi was observed for the acidic reactor.
Second Research (Treatment of Saline Wastewater by Thermophilic Membrane Bioreactor. )
High temperature operation above 50oC is not favorable for biological wastewater treatment because of poor settleability of the sludge. To overcome this drawback of the thermophilic aerobic wastewater treatment process, the combination with membrane for solid-liquid separation is attractive. The treatment of saline wastewater containing persistent organic matters was examined for 35 days by using laboratory-scale thermophilic membrane bioreactors (TMBR) and the performances were compared with a room-temperature reactor. The effect of high temperature operation on the removal of COD, color and oil was examined. Judging from the change in operating pressure, the fouling of the membrane was more sever for the thermophilic reactor. Partial nitrification was observed ever at the thermophilic condition, though a better color removal and a higher nitrification ratio were observed for the room-temperature reactor, which can maintain higher MLSS concentration. High oil removals above 95% and high COD removals as high as 87% were observed for both of the reactors.
A bout data collection and data analysis I already published two research in Water and Environment Technology Journal and it will be attach with this E-mail. Please used it when you writing the dissertation.
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