Method for treating deinking sludge by processing printed waste paper, involves reducing pressure of filtrate to atmospheric level, and removing reacting gas that causes pH value increment and precipitating of chemically-soluble carbonates

摘要

The method involves inserting a deinking sludge (1) into a pressure tank (2), and increasing pressure in the pressure tank and decreasing pH value of the deinking sludge by introduction of a soluble, acidic reacting gas (3) into the pressure tank, where the soluble, acidic is formed by carbon dioxide. The deinking sludge is filtered such that printing inks result as rejection parts (4). Pressure of a filtrate (5) is reduced to an atmospheric level. The reacting gas causing pH value increment and precipitating of chemically-soluble carbonates is removed.