Method for the processing of water by nanofiltration, comprises directly subjecting interior area of polymers or ceramic nanofiltration hollow fibers from raw water in a nanofiltration unit

摘要

The method comprises directly subjecting interior area of polymers or ceramic nanofiltration hollow fibers from raw water in the nanofiltration unit and taking away the permeate at the outside of the nanofiltration hollow fibers. The concentrate stream Q1, a recycle stream Q2 and a permeate stream Q3 are adjusted to 0-90%, 0-300% and 10-100% respectively in related to raw water stream, dependent on the parameters such as moisture content, conductivity, turbidity, dissolved organic carbon-/total organic carbon content and coloration of the raw water, and pressure drop over a membrane (2). The method comprises directly subjecting interior area of polymers or ceramic nanofiltration hollow fibers from raw water in the nanofiltration unit and taking away the permeate at the outside of the nanofiltration hollow fibers. The concentrate stream Q1, a recycle stream Q2 and a permeate stream Q3 are adjusted to 0-90%, 0-300% and 10-100% respectively in related to raw water stream, dependent on the parameters such as moisture content, conductivity, turbidity, dissolved organic carbon-/total organic carbon content and coloration of the raw water, and pressure drop over a membrane (2) forming through the wall of the nanofiltration hollow fiber. The adjusted parameters are detected and the detected values are requisitioned to the control. The parameters are directly measured online or detected over laboratory analysis. The component of the hollow fibers are flushed and/or chemically cleaned through the membrane with water and/or air from the permeate outlet side to raw water inlet side. The raw water is led over a coarse filter (8) for the separation of solid materials in the case of solid materials in the raw water with dimensions that are larger than the interior diameter of the nanofiltration hollow fiber. The auxiliary materials such as flocculating agent are mixed for a continuous operation of the raw water. An independent claim is included for a device for the processing of water by nanofiltration.