A flocculant for domestic sewage and preparation method thereof

By modifying the long-chain crown ether quaternary ammonium salt of montmorillonite and polymerizing with monomers such as acrylamide, a new inorganic-organic polymer hybrid flocculant was formed, which solved the problems of small flocs, slow settlement speed and limited removal effect in the prior art, and achieved efficient removal of organic matter and heavy metal ions in domestic wastewater.

CN118929876BActive Publication Date: 2025-03-18LIAONING LIAOHE JINYU ENERGY GROUP CO LTD SCIENTIFIC RESEARCH BRANCH
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Patent Information

Application Number
CN202411362620.X
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-09-27
Publication Date
2025-03-18
Estimated Expiration
2044-09-27

AI Technical Summary

Technical Problem

In the prior art, inorganic flocculants of polyferrous sulfate have problems with small flocs and slow settlement speed. However, organic flocculants such as polyacrylamide have limited removal effects when used alone, making it difficult to effectively remove organic matter and heavy metal ions in water bodies.

Method used

Montmorillonite is modified in situ by synthesizing a long-chain crown ether quaternary ammonium salt modifier and polymerized with monomers such as acrylamide to form a new inorganic-organic polymer hybrid flocculant.

Benefits of technology

This flocculant can not only effectively remove organic matter and heavy metal ions in domestic sewage, but also has efficient turbidity removal, organic load removal and a certain degree of nitrogen removal and phosphorus removal.

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Abstract

The invention relates to the technical field of flocculants, and discloses a flocculant for domestic sewage and a preparation method thereof. Aza-18-crown-ether-6, 4-dimethylaminobenzoyl chloride, 18-bromo-1-octadecene and the like are used as raw materials and subjected to in-situ intercalation polymerization with montmorillonite, so that the crown ether in the flocculant can provide lone pairs of electrons, form coordination bonds with empty orbitals of heavy metal ions, and form stable complexes; the bridging and adsorption of polyacrylamide polymer chains, the huge specific surface area and the "weighting effect" of montmorillonite accelerate the formation and sedimentation of flocs; the montmorillonite is strung on the polyacrylamide polymer chain, and is connected with microparticles through multi-point adsorption and inter-particle bridging, so that more kaolin particles are adsorbed; the flocculant prepared by the invention has good removal effects on COD, TP and TN in domestic sewage, has high-efficiency turbidity removal and organic load removal capabilities, and has certain nitrogen and phosphorus removal functions.
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