Experimental study on running processes of landfill leachate treatment by ultra-low reverse osmosis membrane
超低压反渗透膜处理垃圾渗滤液运行工艺的实验研究

The ultra-low reverse osmosis membrane was used to process landfill leachate in order to test the variations of flux of membrane, desalination rate, the removal rate of COD and NH3-N under different technical conditions. The research results indicate that a maximum flux is corresponding to a certain output frequency under various pressure conditions. In terms of the changing of the output frequency, the maximum membrane flux at high pressure lags behind that at low pressure. Using the frequency conversion velocity modulation technology, the corresponding relationship between the operating pressure and the pump flow rate in real-time can be solved, optimum flow parameters can be obtained, and the efficiency of the ultra-low reverse osmosis membrane system can be enhanced. The flux of membrane and the desalination rate increase along with the increment of pressure, but the growth rate slows down. The suitable pressure could be set to 0.8~0.9 MPa. Changing the pH value has smaller influence on the removal rate of COD and NH3-N, but has greater impact on the desalination rate. When pH increases the flux of membrane reduces. The suitable scope of pH of landfill leachate should be ranged from 7.5 to 8.5. The flux of membrane and the desalination rate decrease along with the increment of the influent conductivity, and the influent conductivity should be no more than 18 mS/cm.