Phosphate removal method

The sequential use of a water-soluble iron compound and iron ion remover, particularly with iron sulfate and Akadama soil, addresses the inefficiencies of existing methods by improving phosphate removal capacity and reducing water discoloration and turbidity.

JP7743719B2Active Publication Date: 2025-09-25OHBAYASHI GUMI LTD
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Patent Information

Application Number
JP2021105889
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Filing Date
2021-06-25
Publication Date
2025-09-25
Estimated Expiration
2041-06-25

AI Technical Summary

Technical Problem

Existing phosphate removal methods using allophane and iron sulfate face issues such as high cost due to large adsorbent usage, and water discoloration and turbidity from iron sulfate dissolution.

Method used

A method involving the sequential passage of water through a water-soluble iron compound followed by an iron ion remover, preferably using iron sulfate and Akadama soil, with a specific mass ratio, to adsorb and remove phosphate ions effectively.

Benefits of technology

This method enhances phosphate removal capacity, reduces the amount of adsorbent needed, and minimizes water discoloration and turbidity by leveraging the high adsorption capacity of iron ions and their subsequent removal.

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Abstract

To provide a method of removing phosphoric acid, capable of preventing coloration and turbidity of water.SOLUTION: The method of removing phosphoric acid, allows water that contains phosphoric acid to flow through a water-soluble iron compound and an iron ion removing agent, in this order. The water-soluble iron compound is preferably an iron sulfate. The iron ion removing agent is more preferably Akadama soil. The mass ratio of the iron ion removing agent and the water-soluble iron compound (iron ion removing agent:water-soluble iron compound) is particularly preferably from 39:1 to 19:1.SELECTED DRAWING: Figure 1
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