NF Plant - Nano Filtration Plant
NF stands for Nanofiltration, which is a membrane-base filtration process use in wastewater treatment to remove a wide range of contaminants, including dissolve solids, organic compounds, and some divalent ions. It is a filtration process that operates between reverse osmosis (RO) and ultrafiltration (UF) in terms of pore size and molecular weight cut-off.
System Components
Nanofiltration membranes have smaller pore sizes compare to UF membranes but larger pore sizes compared to RO membranes. The typical pore size of nanofiltration membranes ranges from 1 to 10 nanometers. This allows nanofiltration to selectively remove particles, ions, and organic molecules base on their size and charge.
NF Membrane Module: The NF membrane module contains the nanofiltration membranes that serve as the filtration barrier. These membranes are typically made of thin films of polymeric materials with specialize characteristics to allow the separation of contaminants base on their size and charge.
Feed Pump: The pump supplies the wastewater to the nanofiltration system at a controller flow rate and pressure. This pressure forces the water through the nanofiltration membranes, while retaining the target contaminants.
Filtrate Collection System: The filtrate collection system collects the purifie water, known as permeate or filtrate, that passes through the nanofiltration membranes. This controller water is typically further treate or discharge.
Reject or Concentrate Disposal: The contaminants that are retain by the nanofiltration membranes, along with a portion of the water, form a concentrate or reject stream. This stream contains the concentrate contaminants and is discharge or further treate as per the specific wastewater treatment requirements.
Process Description
Nanofiltration operates base on several mechanisms, including size exclusion, charge interactions, and solute rejection. The smaller pore size of the nanofiltration membranes allows for the removal of dissolve solids, organic matter, and certain ions while allowing smaller ions and water molecules to pass through.
Significance & Advantages
Selective Contaminant Removal: Nanofiltration effectively removes a wide range of contaminants, including dissolve solids, organic compounds, and some divalent ions, while allowing smaller ions and water molecules to pass through.
High Water Recovery: Nanofiltration can achieve a high water recovery rate by selectively removing contaminants while retaining water molecules.
Reduced Energy Consumption: Nanofiltration typically requires lower operating pressures compare to reverse osmosis, resulting in reduce energy consumption.
Versatility: Nanofiltration can be applied to various wastewater treatment applications, including drinking water production, wastewater reuse, and industrial process water treatment.
Removal of Color, Odor, and Taste: Nanofiltration can effectively remove color, odor, and taste-causing compounds from the wastewater, resulting in improve water qualit
