Purification engineering is a basic supporting industry with a very wide range of application industries. The precision and dust-free requirements of different grades are also quite different.

1. Strict aseptic operation to prevent microbial contamination; operators should turn off the UV lamp before entering the sterile room.

2. The food aseptic workshop should be equipped with an aseptic operation room and a buffer room. The cleanliness of the aseptic operation room should reach 10,000 grades, the indoor temperature should be kept at 20-24 ℃, and the humidity should be kept at 45-60%. The cleanliness of the ultra-clean bench should reach class 100.