Studies On The Treatment Technology Of The Municipal Landfill Leachate In Lanzhou City

This thesis mainly researches on several kinds of physical-chemical methods and their combined process to treat landfill leachate of Lanzhou Lujiadagou. Through a series of experiments, finally indicated that under the best condition the TOC and chroma decreased to 2272.93mg/L and 14572 degree, removeing rate respectively achieves 54.13% and 48.58% by coal-burning slag adsorption, and the kinetics of coal-burning slag adsorb the TOC of landfill leachate accord with Elovich equation,the adsorption of TOC in landfill leachate follows Freundlich isotherm; the TOC and chroma decreased to 421.48mg/L and 4019 degree, removeing rate respectively achieves 71.49% and 85.82% by precipitation by added acid under the best condition; the TOC and chroma decreased to 777.525mg/L and 1200 degree, removeing rate respectively achieves 84.31% and 95.77% by precipitation by added acid—coal-burning slag integrated process; the TOC and chroma decreased to 777.525mg/L and 1200 degree, removeing rate respectively achieves 84.31% and 95.77% by precipitation by added acid—coal-burning slag—photocatalysis integrated process. We can conclude that precipitation by added acid—coal-burning slag integrated process have a highest TOC and chroma removal efficiency.There are 3 chapters in this thesis.In the first chapter the produce, water quality characteristic and the treat methods are introduced. Emphatically introduced the landfill leachate treating methods, and has carried on the analysis to each kind of method good and bad points. It also makes a depiction on some problems in present treatment method, and gives a introduction of aim and meaning of the research at this part.In the second chapter the landfill leachate of Lan Zhou is analysed and treated. The concentration of COD_Cr, BOD₅, TOC, ammonia-nitroge, and chroma of the landfill leachate used are 11800mg/L, 5960mg/L, 4954.92mg/L,2374mg/L and 28339degree. The research of applying physical-chemical method to treat the landfill leachate of Lanzhou Lujiadagou landfill is introduced in this paper. We choose the adsorption of method, chemical precipitation, chemical precipitation—adsorption integrated process and chemical precipitation—adsorption—photocatalysis integrated process to treat the landfill leachate of Lanzhou Lu Jiadagou. And we get a satisfactory result.In the third chapter the summary to this thesis research has made, and the furtherworks of this research are suggested.