Treatment Of Landfill Leachate By MBR And Advanced Technologies

The treatment of the landfill leachate by MBR was studied in this thesis.The influent of MBR had been treated by anaerobic-aerobic technology. During the experiment, the range of COD, BOD5, ammonia-nirtogen and chroma in influent were 612～1467mg/L, 15～22 mg/L, 0.42～131.69 mg/L, 646～1120mg/L, respectively. The removal of COD, BOD5, ammonia-nirtogen and chroma at an overall HRT of 8～12h achieved 22.33%, 90%, 75.9% and 36.4%, respectively. The results showed that MBR still had some degradability to organic compound of effluent treated by biochemical technology. But the effluent treated by biochemical technology had lots of non- biodegradable organic compound, so the ability of MBR to degrade the organic compound is limited. High salinity of effluent treated by biochemical technology strongly suppressed the activity of sludge, which led to low removal of COD. Organic compound that can cause chroma mainly consist of dissolvable low molecular weight organic compound, so the ability of MBR to elimilate chroma in landfill leachate is limited.Putting powder active carbon and active sludge into MBR respectively, also combining them together into MBR were used for improving the removal of COD. Compared with the three methods, putting powder active carbon into MBR and combining them together were better and the removal of COD had increased from 16.53% to 33%. But the removal of COD could not maintain high level by three ways for a long time. The removal of COD gradually descended to the initial level after ten days by putting powder active carbon into MBR and combining them.It had been studied about ozonation,active carbon adsorption and ozone- active carbon process to improve the quality of effluent, because COD of effluent from the MBR was still high. When the ozone dose is 115mg/L, the active carbon dose is 5g/L and the adsorption time is 45min, after ozonation the COD removal rate is 28.12%, the UV254 removal rate is 66.67% and the chroma removal rate is 95.4%, after adsorption the total COD removal rate is 42.96%, the total UV254 removal rate is 89.58% and the total chroma removal rate is 100%.