The paper industry is a major user of water and one of the major sources of pollution of the water environment. According to statistics in recent years, the waste water discharge of the paper industry accounts for 15% of the national industrial waste water discharge, and the COD discharge accounts for nearly 1/3 of the national industrial waste water COD discharge.

Papermaking wastewater mainly includes:

1. pulping wastewater

2. papermaking wastewater