A rapid method for preparing toxic leachate from waste incineration fly ash

By adjusting the pH value of the extractant, especially by lowering the initial pH value of the acetic acid buffer solution, the leaching time for fly ash leaching toxicity was shortened, solving the problems of long detection time and insufficient accuracy in existing technologies. This method enables rapid preparation of leachate for the leaching toxicity of waste incineration fly ash and can quickly guide on-site adjustment of chelating agents.

CN116990291BActive Publication Date: 2026-06-30BAOWU GRP ENVIRONMENTAL RESOURCES TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
BAOWU GRP ENVIRONMENTAL RESOURCES TECH CO LTD
Filing Date
2023-07-28
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Existing methods for detecting the leaching toxicity of fly ash from waste incineration suffer from problems such as long detection time and insufficient accuracy, making it impossible to quickly obtain leaching toxicity data to guide on-site adjustments to the type and amount of chelating agents.

Method used

By adjusting the pH of the extractant, especially by lowering the initial pH of the acetic acid buffer solution, the leaching time for fly ash leaching toxicity can be shortened. The leachate can be rapidly prepared by shaking the fly ash sample with the acetic acid buffer solution.

Benefits of technology

It enables the acquisition of data on the leaching toxicity of fly ash from waste incineration on the same day, providing rapid guidance for on-site adjustments to the type and amount of chelating agent, thereby improving the accuracy and efficiency of testing.

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Abstract

This invention discloses a rapid preparation method for leaching toxicity extract from waste incineration fly ash, comprising the following steps: S1, drying the fly ash sample to obtain its moisture content, and then grinding the dried fly ash sample; S2, reacting the ground fly ash sample with sucrose solution, adding phenolphthalein indicator, titrating with hydrochloric acid, and obtaining the acid neutralization capacity K per unit mass of fly ash; S3, using an acetate buffer solution as the extraction agent, obtaining the pH of the fly ash leaching toxicity extract after 1 hour and 18 hours, respectively; S4, adjusting the initial pH of the acetate buffer solution according to the pH difference between the fly ash leaching toxicity extracts after 1 hour and 18 hours in step S3; S5, using the acetate buffer solution with the adjusted initial pH as the extraction agent, shaking the fly ash and reacting for 1 hour to complete the preparation of the fly ash leaching toxicity extract. This invention can accelerate the leaching process of fly ash and shorten the preparation time of the fly ash leaching toxicity extract.
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