ZVL black liquor filter is an improved type of micro-filter which is an equipment to recycle the fine fiber drained to the waste water during the process flow of waste paper.

A newly developed novel efficient black liquor extraction equipment, gasbag press filter, used for wheat straw pulp washing is introduced in this paper.

Aerocyst filter press, wheat straw black liquor extraction equipment developed recently, was introduced, used for extracting detection results of wheat straw black liquor operation performance.