A method for preparing a raw material solution for slowing down membrane pollution in a forward osmosis concentration process of chemical nickel plating waste tank liquid

By oxidizing, precipitating, flocculation and aeration of the electroless nickel plating waste tank liquid, and adjusting the pH value, the raw material liquid is prepared to slow down positive permeability membrane pollution, which solves the membrane pollution problem, extends the membrane service life and improves the water recovery rate.

CN115925149BActive Publication Date: 2025-03-28JIANGSU ECOLOGICAL ENVIRONMENT TECHNOLOGY RESEARCH INSTITUTE CO LTD
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Patent Information

Application Number
CN202211375131.9
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-11-04
Publication Date
2025-03-28
Estimated Expiration
2042-11-04

AI Technical Summary

Technical Problem

During the process of positive penetration and concentrated electroless nickel plating waste tank liquid, membrane pollution problems are serious, resulting in a decrease in water flux and a shortened membrane service life, increasing operating costs.

Method used

By oxidizing the electroless nickel plating waste tank solution, CaO precipitation, polyacrylamide flocculation and aeration, finally using concentrated sulfuric acid to adjust the pH value to acidity, and prepare the raw material solution to alleviate film contamination.

Benefits of technology

It significantly slows down membrane pollution, extends the working cycle of the membrane, reduces economic value loss, and significantly reduces the volume of the concentrated waste tank liquid, and the water recovery rate reaches 75%-80%.

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Abstract

The invention discloses a raw material liquid preparation method for forward osmosis concentration of chemical nickel plating waste tank liquid to alleviate membrane pollution. The chemical nickel plating waste tank liquid is firstly connected with O3 for oxidation and complex breaking reaction, and phosphorous and hypophosphorous are oxidized to orthophosphate at the same time; then CaO is added, and the dissociated Ca 2+ and OH ‑ Part of the nickel and phosphorus are removed by precipitation respectively; the waste liquid is aerated and stripped to further remove nitrogen-containing pollutants, and the escaped NH3 is fixed with sulfuric acid to achieve ammonium sulfate recovery; flocculants are added to strengthen solid-liquid separation; and finally, concentrated sulfuric acid is used to adjust the solution pH. This method does not introduce new ions into the raw liquid, and the concentration of pollutants in the chemical nickel plating waste tank liquid after regulation is reduced, which effectively reduces the osmotic pressure. The FO process is concentrated using the chemical nickel plating waste tank liquid after regulation as the raw liquid, which significantly alleviates membrane pollution and ensures continuous and stable operation of the system. The volume of the concentrated chemical nickel plating waste tank liquid is significantly reduced, which effectively reduces the processing volume, and the water recovery rate reaches 75%-80%.
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