Treatment Effect Research On The Refractory Organic Pollutants With Dissimilatory Mn (Ⅳ) Reduction

Dissimilatory iron and manganese reduction in nature plays an important role tophysical geochemistry cycle. Reduction of Mn(Ⅳ) oxide which occurred in kinds ofanaerobic conditions, such as sediments, aquifer and inundational paddy soil, is a ratherimportant geochemistry process, which Mn(Ⅳ). Mn(II) cycle is to some extentcontrolled by bio.transform and enzyme reaction. Under anaerobic condition, metalcould not only been reduced from high value, but also its transform, toxicity andradioactivity in the environment could be changed with the microbial manganesereduction. Meantime, dissimilatory manganese reduction could oxide organiccompound and promote organic carbon metabolism. Dissimilatory metal reduction hasbeen gradually applied in bio.metallurgy (such as biology immersion of Mn, Co, Ni andAu), bioremediation of heavy metal ions (such as Cr, V, Co, Ni, U, Cu and Cu) andbio.decomposing of permanent organic contaminated water. Therefore, dissilmilatoryMn(Ⅳ) reduction not only has important geochemistry significance, but has displayedprominent environment applied foreground. In recent years, people started to payattention to impacts of refractory organic pollutants especially tracecontaminants.pharmaceuticals, such as personal care products(PPCPs), on theenvironment, biological and human health, which was developed into global hot spots.Studies showed that some refractory organic pollutants had reproductive, neurologicaland toxicological effect on humans and other organisms or had carcinogenic potencial.While the removal effect of a considerable portion of refractory organic pollutants wasnot significant by conventional water treatment processes such as biologic, coagulation,sedimentation and filtration. Therefore, based on the theory of dissimilatory manganesereduction, this study had proposed a treatment method for refractory organic pollutantsby use of the theory that refractory organic pollutants can act as electron donor in theprocesses of dissimilatory manganese reduction.This experiment is conducted to study performance liquid chromatographicconditions of carbamazepine(CBZ) and diclofenac(DCF), trace CBZ and DCFdetermination method in water, and has established CBZ and DCF determinationmethod. Through vaccination microbial from the Jialing River sediment to theanaerobic bioreactor, analog anaerobic bioreactor and test indicators such as theconcentration of CBZ and DCF, T, PH, conductivity and Mn(II) inlet and outlet of anaerobic bioreactor on the different conditions such as plus or don’t plus the Csource(the electron donor easy to exploited by dissimilatory metal.reducing bacteria),plus or don’t plus the MnO2(electron acceptor) in the reactors, this study has analyzedof the treatment effect of CBZ and DCF in the bacteria and out of bacteria reactors.The key results and conclusions are as follows:In the case of sodium acetate as the C source, The ability of dissimilatorymetal.reducing bacteria which from freshwater sediments of Jialing River reduction ofMn (IV) is enhanced with increasing waterlogged incubation time, and on thewaterlogged incubation6.19d reached the maximum degradation rate.When the inflow of anaerobic reactor without sodium acetate, the average removalrates of CBZ in bacteria group and sterile group during30d were25.23%and22.42%,and the average removal rates of DCF were32.44%and17.57%, respectively. Theanalysis of variance showed that in this case the dissimilatory manganese reduction hasa significant role in the removal of DCF but CBZ, and the remove of DCF issignificantly greater than the remove of CBZ.When the inflow of anaerobic reactor with sodium acetate, the average removalrates of CBZ in bacteria group and sterile group during23d were25.25%and16.09%,and the average removal rates of DCF were21.77%and7.35%, respectively. Theanalysis of variance showed that in this case the dissimilatory manganese reductionhave significant role both in the removal of CBZ and DCF, and the remove of DCF issignificantly greater than the remove of CBZ. Compared to without sodium acetate, theinflow of anaerobic reactor with sodium acetate can make dissimilatory manganesereduction has a significant strengthen in the remove of CBZ but DCF.When the inflow of anaerobic reactor with sodium acetate and25.0g MnO2in thereactors, the average removal rates of CBZ in bacteria group and sterile group during29d were53.89%and40.10%, and the average removal rates of DCF were24.66%and16.48%, respectively. The analysis of variance showed that in this case the dissimilatorymanganese reduction has a significant role in the removal of CBZ but DCF. Comparedto without MnO2, the reactors have25.0g MnO2can make dissimilatory manganesereduction have significant strengthen in the remove of CBZ but DCF.