Dealdehyde removal by biological enzyme is to decompose formaldehyde harmful substances into harmless substances through the catalytic action of biological enzyme. In this process, biological enzymes react with harmful substances to produce some intermediate products. If these intermediate products cannot be completely decomposed or treated, powder will be formed.

The biological enzyme consists of protein. Improper handling during preparation or storage will lead to degeneration or pollution of protein, resulting in impurities and precipitation.