A method for efficiently pretreating epoxy resin production wastewater

By reacting foundry waste sand with hydrogen peroxide and then pretreating it with ferrous sulfate and bentonite, the impact of organic matter in epoxy resin production wastewater on the evaporator was solved. This achieved efficient wastewater treatment and waste sand recycling, reduced energy consumption, and improved evaporation efficiency.

CN118062967BActive Publication Date: 2026-06-16DALIAN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
DALIAN UNIV
Filing Date
2024-04-01
Publication Date
2026-06-16

AI Technical Summary

⚠Technical Problem

In existing methods for treating epoxy resin production wastewater, the presence of organic matter leads to decreased evaporator efficiency and increased energy consumption. Furthermore, organic matter in the wastewater affects salt reuse, resulting in unsatisfactory traditional treatment effects.

⚗Method used

After reacting foundry waste sand with hydrogen peroxide, it is pretreated with ferrous sulfate, aluminum trichloride and bentonite. The precipitate is removed by centrifugation, and the supernatant is then subjected to downstream evaporation and crystallization.

🎯Benefits of technology

It significantly reduces organic residue before the evaporator, lowers energy consumption, and enables the recycling of waste sand, thereby improving evaporation efficiency and salt reuse.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application relates to the technical field of industrial wastewater treatment, in particular to a high-efficiency pretreatment method of epoxy resin production wastewater. The method comprises the following steps: 1) adding waste sand for casting into hydrogen peroxide with a mass concentration of 5% to carry out reaction, and taking supernatant I; 2) adding the epoxy resin production wastewater into the supernatant I obtained in the step (1), and taking supernatant II after standing, centrifugation and removal of the precipitate; 3) adding ferrous sulfate, aluminum chloride and bentonite into the supernatant II obtained in the step (2), standing, centrifugation, and reserving supernatant III for downstream evaporation crystallization treatment. After the wastewater pretreatment before entering the evaporator, the method can reduce the organic matter residue in the later period, reduce the energy consumption of the evaporator, and comprehensively utilize the wastewater treated by the waste sand for casting, so that the purposes of one-step two-achievements are realized.
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