Coagulation - The Experimental Study Of The Nanofiltration System Depth Treatment Of Municipal Secondary Effluent

China has a low per-capita water resources, and witch is a very uneven distribution of time and space. With population growth and economic development, water supply and demand have become increasingly prominent. In many areas, particularly in the northern city groundwater as a supply of water and some coastal cities long overload exploitation of groundwater, shortage of water volume. So water-deficient areas in urgent need effective use of renewable water, reasonably recovered groundwater, and increasing water volume.The studying object is secondary effluent of the city after biochemical dealing with (for simulation experiments with the actual operation of water). Experiments revealed Coagulate-NF system availability. Research show that Coagulate-NF system can effectively remove raw water turbidity, organic, inorganic and bacteriological pollutants. Water underground to irrigate water meets water quality standards.Preliminary experiments in the aggregate sedimentation,, through a series of single tests and orthogonal test conditions, the impact of the aggregate effect of operating conditions for the operation of portfolio optimization.Experiments explored the best NF operational parameters(the operating pressure, operating hours and water temperature) impact the operating conditions and the separation performance. Using dissolved - proliferation of models to explain the operation of pressure membrane flux, the law of change in the separation of functions. With the increase in operating pressure, membrane flux increases, the system for ion removal increases. According membrane operating time, flux drop in a membrane, the removal reduce phenomenon, witch reveals the impact of operational time to membrane. Using dissolved - proliferation of models and Arrhenius equation fill with water temperature for membrane made of the impact analysis.Through membrane pollution analysis, given the salt concentration polarization affecting the membrane flux models, osmotic pressure change analysis models and the dead nanofiltration models. As already revealed by the extension of operating hours, increased osmotic pressure, membrane pollution increases, membrane flux reduction...