With the increasing scarcity of fiber resources and environmental protection requirements, the application of waste paper raw materials in papermaking is becoming increasingly widespread. According to data, the consumption of waste pulp in China was 63.29 million tons in 2016, and it has been increasing year by year. During the use of waste paper, it must go through a series of processes such as fragmentation, washing, deinking, and screening. Usually, producing one ton of deinked pulp requires the discharge of 20-30m3 of wastewater. The performance of deinked pulp wastewater is significantly different from that of chemical pulp wastewater. The main components of deinked pulp wastewater are suspended solids, including various ink particles, mineral fillers, fine fibers, sediment, etc. Secondly, it contains more soluble and insoluble adhesives and chemical substances, resulting in a higher COD content in the wastewater (around 2000mg/l). Due to the dye components in the ink components of deinked pulp and waste paper, the wastewater has high chromaticity and deep color. Some organic substances in the water are prone to breed bacteria, causing the deinked pulp wastewater to emit a foul odor, especially in summer. In addition, due to the high requirements for the treatment of deinking pulp wastewater used in high-end cultural paper, the wastewater from the waste pulp production line is usually discharged after three-level deep treatment. This treatment process has high operating costs, large land occupation, and high equipment investment. Developing efficient and low-cost wastewater treatment processes to reduce operating costs is one of the urgent issues that waste pulp production enterprises need to solve.

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