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Crude herbal extract often presents dark color caused by macromolecular pigments, tannin polymers and humus‑like substances. Conventional decolorization relies heavily on activated carbon adsorption, which leads to effective ingredient loss, disposable carbon waste and complicated post‑treatment. Nanofiltration membrane realizes physical decolorization by molecular weight cut‑off difference. It intercepts most high‑molecular‑weight pigments while retaining majority of target active components. This article discusses the mechanism of nanofiltration decolorization, compares with activated carbon process, analyzes influencing factors such as temperature, pH and transmembrane pressure, and states application value for herbal and plant extract factories.
Industrial wastewater contains a large amount of dissolved inorganic salts, small-molecule organic pollutants and refractory heterozygotes after conventional biochemical treatment. Traditional wastewater treatment processes can only remove suspended solids and partial COD, but cannot effectively separate soluble salts and micro-molecular organic matter, resulting in high conductivity of tail water, difficult resource reuse and large discharge volume. Nanofiltration membrane technology utilizes dual mechanisms of molecular screening and charge repulsion to achieve selective separation of wastewater components. It effectively intercepts organic pollutants and multivalent salt ions while allowing partial monovalent salts to permeate, realizing synchronous desalination, organic removal and wastewater volume reduction. As an advanced pretreatment technology for zero-discharge systems, nanofiltration has become a key solution for modern industrial wastewater standard treatment and resource r
Membrane separation technology including ultrafiltration, ceramic membrane clarification and nanofiltration concentration has become an advanced processing solution for premium spray-dried kale powder. Traditional manufacturing often damages heat-sensitive nutrients via thermal evaporation and leaves impurities that cause sediment and bitter taste. By adopting physical screening under room temperature, membrane systems remove colloids, suspended solids and microbes while retaining chlorophyll, polyphenols and minerals. This technology improves juice clarity, enhances powder solubility, lowers production energy consumption and moderates unpleasant bitterness. It is worth noting that membrane treatment applies only to extract-based spray-dried kale powder rather than simple freeze-dried milled kale powder. For food ingredient manufacturers, membrane separation helps produce high-value green vegetable powder with stable quality and extends product shelf life.
