Water content of photoresist waste liquid

The waste liquid discharged from the development process and stripping process of printed circuit board manufacturing industry is an alkaline solution in which a large amount of water-soluble photoresist is dissolved, so it has high COD (chemical oxygen demand), such as 5000 to 10000mg/L and high BOD (biochemical oxygen demand), such as 1000 to 3000 mg/L. In order to treat these waste liquids to obtain harmless liquid,