Process and system for removing heavy metals from ink wastewater

By preparing a metal composite coagulant and a modified polyethersulfone membrane, the problems of low heavy metal removal efficiency and resource recovery in ink wastewater were solved, achieving efficient and economical ink wastewater treatment, reducing costs and extending membrane lifespan.

CN121573875BActive Publication Date: 2026-05-01SHENZHEN JIEWANG FINE CHEM TECH
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Patent Information

Application Number
CN202610087680.8
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2026-01-22
Publication Date
2026-05-01
Estimated Expiration
2046-01-22

AI Technical Summary

Technical Problem

Existing technologies are inefficient at removing heavy metals from ink wastewater, and the treatment costs are high. They also fail to achieve resource recovery. Traditional coagulants have limited effectiveness, commercial adsorbents are expensive, membrane fouling is severe, and sludge production is large.

Method used

A metal composite coagulant was prepared using iron-copper slag, and combined with an ink sludge-based adsorbent and a catechol-modified polyethersulfone membrane. Through coagulation, adsorption, and membrane filtration, the ink wastewater was thoroughly purified and heavy metal resources were recovered.

Benefits of technology

It improves the efficiency of ink wastewater treatment, reduces costs, achieves efficient removal and resource recovery of heavy metals, extends membrane lifespan, and reduces sludge production.

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Abstract

This invention relates to the field of wastewater treatment technology, specifically to a process and system for removing heavy metals from ink wastewater. It includes the following steps: coagulating ink wastewater with a metal composite coagulant, adsorbing and removing sludge wastewater with an ink sludge-based adsorbent, and filtering wastewater using a catechol-modified polyethersulfone membrane, followed by detection. This invention utilizes high-iron copper slag with titanium tetrachloride and acetylacetone to prepare a metal composite coagulant, transforming the copper slag into a high-value-added water treatment agent. This significantly reduces the production cost of the coagulant. Through the synergistic leaching of dilute sulfuric acid and hydrogen peroxide, the iron element in the copper slag is efficiently extracted and oxidized into Fe, which has a strong coagulation effect. 3+ The trace amounts of copper and other metal ions dissolved also provide a basis for subsequent composite reactions, thus improving the overall treatment efficiency and effluent quality of oily sludge wastewater.
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