Membrane Filtration and Concentration for Black Rice Wine

Membrane Filtration and Concentration for Black Rice Wine

Black rice wine is a traditional fermented beverage cherished for its rich anthocyanins, unique aroma, and mild sweet flavour. However, the conventional production process often brings challenges such as unstable clarity, easy sedimentation, low effective substance content, and limited storage shelf life. Membrane separation technology provides an efficient, low-temperature solution to solve these bottlenecks without damaging the natural quality of black rice wine.

In the production workflow, microfiltration is adopted as the first step for crude clarification. It effectively removes suspended yeast cells, residual rice husk particles, macromolecular proteins and colloids that cause turbidity and precipitation. Unlike traditional diatomite filtration, membrane filtration avoids filter aid residue and secondary contamination, simplifying subsequent cleaning and waste treatment. The clarified permeate retains most aromatic compounds, amino acids and natural pigments in the wine liquid.

Ultrafiltration is then used for further purification. It intercepts harmful macromolecular impurities while letting small flavour molecules pass through steadily. After purification, the black rice wine enters the nanofiltration concentration unit. Operating at ambient or low temperature, nanofiltration selectively removes excess water and part of free sugar, concentrating anthocyanins, polyphenols and functional ingredients. Since there is no high-temperature evaporation, heat-sensitive active substances will not degrade, preserving the original dark purple colour and characteristic fermented fragrance.

This integrated membrane system supports continuous production and automatic CIP cleaning. It cuts energy consumption greatly compared with thermal concentration. The final concentrated black rice wine features stable colour, bright luster, fewer precipitations and higher nutritional value. It can be diluted directly for finished wine bottling or used as a high-value raw material for beverages, seasonings and functional food.

For black rice wine manufacturers, membrane filtration and concentration is a reliable upgrade route. It balances product stability, nutrition retention and production cost, helping standardise product quality and expand application scenarios of this characteristic fermented drink.