The Fenton process promotes the decomposition of organic substances in industrial wastewater, effectively reducing the biological toxicity concentration in the wastewater and improving water quality and biodegradability. However, different industrial productions will produce different types of industrial wastewater, which contains complex organic and toxic substances. Therefore, the use of Fenton process to treat different industrial wastewater will also have certain differences in effectiveness. This is because the reaction effects of different organic compounds under different amounts of Fenton reagent are different. At the same time, in the mixed reaction of organic compounds and Fenton reagent, molecules will undergo dehydrogenation, causing C-C structure chain breakage. For example, if the industrial wastewater being treated contains a large amount of water-soluble polymers or ethylene compounds, it is easy to produce hydrogen radical chain breakage under the action of Fenton reagent, which affects the actual effect of Fenton treatment.

Dyeing and printing wastewater is generated by industrial printing and dyeing, and the pigment content in the wastewater is high. The pigment sediment has strong pollution to other water bodies, and the salt content of these wastewater is very high, which also makes the biochemical properties of industrial dyeing and printing wastewater weak. From the results of conventional treatment techniques, it can be seen that the oxygen demand concentration of printing and dyeing wastewater itself is too high, resulting in unsatisfactory treatment efficiency and effectiveness. The advantage of the Fenton process is that it can gradually decompose these organic compounds into degradable substances, providing an important pathway for effectively treating printing and dyeing wastewater. The Fenton process can greatly reduce the overall color of dyes in printing and dyeing wastewater under strong oxidation. Currently, many treatment plants use other processes derived from the Fenton process in addition to the general Fenton process when treating printing and dyeing wastewater, mainly to fully utilize its strong oxidation performance. For example, many wastewater treatment plants often use micro electrolysis oxidation process to micro electrolyze the most difficult to degrade anthraquinone dyes in printing and dyeing wastewater, which can maximize the degradation of organic matter in anthraquinone dye wastewater.