Oilfield Produced Water Treatment by Membrane Separation Technology
Oilfield produced water contains crude oil, suspended solids and organic pollutants, posing challenges for discharge and reuse. Doupu’s membrane separation technology effectively removes oil contaminants. The lab test shows stark visual contrast: raw oily wastewater is turbid brown, while the permeate after membrane filtration becomes clear, and oil plus impurities are concentrated in retentate. This membrane solution enables water recycling for oil & gas plants, cuts operational costs and reduces environmental risks.
Nanofiltration Membrane Low-Temperature Concentration Technology for Botanical Extract Processing
Traditional plant extract concentration mainly relies on vacuum evaporators, which require long-term high-temperature heating. The thermal processing easily causes oxidation, browning and activity loss of heat-sensitive natural active ingredients, resulting in low product quality and low material utilization rate. In addition, thermal concentration cannot remove micro-soluble impurities, leading to high moisture ash content and poor stability of finished extracts. Nanofiltration membrane separation technology adopts low-pressure physical interception to realize efficient water removal and synchronous purification of botanical extracts at room temperature. It concentrates effective components while removing partial small-molecule impurities, greatly improving product purity, color and yield. With the advantages of energy saving, no thermal damage and stable batch consistency, nanofiltration low-temperature concentration has become an indispensable core process in modern plant deep-proce
Nanofiltration Membrane Technology for Desalination, Decolorization and Concentration of Plant Extracts
Crude plant extracts obtained via water or alcohol leaching contain a variety of non-target impurities, including inorganic salts, small-molecule pigments, free organic acids and heteropolysaccharides. These residual impurities lead to dark color, high ash content, poor purity and unstable shelf performance of finished plant extracts. Traditional refining methods such as resin adsorption and vacuum evaporation cannot achieve synchronous desalination, decolorization and low-temperature concentration, and often cause serious loss of heat-sensitive active ingredients. Cross-flow nanofiltration membrane technology utilizes dual effects of molecular screening and charge repulsion to realize selective separation of plant extract components. It effectively removes small-molecule salt ions and pigment impurities while retaining macromolecular active substances such as flavonoids and polyphenols. This integrated green process greatly improves the purity, appearance quality and stability of plan
