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Preparation method and usage of mineral stabilizer for controlling release of phosphor and heavy metals in dredged sediment

A technology for dredging sediment and minerals, applied in chemical instruments and methods, sludge treatment, water/sludge/sewage treatment, etc., and can solve the problems of high treatment costs and difficult large-scale application.

Inactive Publication Date: 2011-07-06
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These stabilizers all have the disadvantages of high processing costs and difficulty in large-scale application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0017] Example 1 (static experiment)

[0018] The red mud and fly ash are ground separately until the particle size is less than 0.425mm, and compounded according to the mass ratio of 1:1, the mineral stabilizer can be prepared.

[0019] The dredged sediment and the mineral stabilizer are evenly mixed according to the mass ratio of 0%, 1%, 3%, 5%, 7%, and 10%. The proportion increases, and the degree of compaction of the dredged bottom mud is strengthened. Take out the cultured dredged sediment and freeze-dry it or dry it naturally, grind and crush it through a 100-mesh sieve; take 2.5g samples respectively, add deionized water according to the solid-liquid ratio of 1:20, and set the temperature at 25°C at a speed of 30r / min. Shake on a tumble shaker for 18 hours; measure the pH of the leachate, then filter through a 0.45 micron membrane, and measure phosphorus with a spectrophotometer.

[0020] Experiments show that: mixing 1%-10% mineral stabilizer in the dredged sediment ...

example 2

[0021] Example 2 (dynamic experiment)

[0022] Red mud and phosphogypsum are respectively ground to a particle size of less than 0.425 mm, and compounded at a mass ratio of 3:7 to prepare a mineral stabilizer.

[0023] The dredged bottom mud and the mineral stabilizer are uniformly mixed according to the weight ratio of 0%, 3%, 5%, and 10%, and are respectively loaded into columns with an inner diameter of 40mm and a height of 500mm. Cultivate in airtight shade for 3 days. Add acidic extractant once every four days, add 125ml acidic extractant 8 times in a row (pH = 4.2 extractant in the US Environmental Protection Agency SPLP method is used for leaching experiments to evaluate the fixation of heavy metals in dredged sediment by mineral stabilizers effect), pass through a 0.45 micron membrane filter, measure copper, lead, zinc, and chromium heavy metals with inductively coupled plasma emission spectroscopy, and measure arsenic with atomic fluorescence.

[0024] Experiments s...

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Abstract

The invention belongs to waste resource recycling and non-point source pollution control technology in the resource and environment technology field, and particularly relates to a preparation method and a usage of a mineral stabilize. The mineral stabilizer is prepared by mixing red mud which is generated by the residue extracted by bauxite from alumina industrial production and is used as the main raw material and fly ash (or phosphogypsum) in certain proportion. The mineral matter solid stability agent in a certain proportion is blended into dredged sediment, then the mixture is stirred and stockpiled for a while. By processing dredged sediment according to the method, release of phosphor and heavy metals in the dredged sediment can be controlled so as not to pollute the surrounding water. The technology of the invention solves the present problem that phosphor and the heavy metal release in the dredged sediment causes the secondary pollution in the sediment dredging engineering implementation process. The method is simple and easy to do, has high managing efficiency, low managing cost, and provides a effective solving approach with preventing and controlling phosphor and heavy metal release in dredged sediment.

Description

technical field [0001] The invention relates to a method for preparing and using a mineral stabilizer for effectively controlling the release of phosphorus and heavy metals in dredged sediment, which belongs to the recycling of waste resources and the control technology of non-point source pollution in the field of resources and environment technology. Background technique [0002] Sediment pollution of water bodies is a worldwide environmental governance problem. The pollutants in the sediment of the water body mainly include heavy metals, refractory organic matter and nitrogen and phosphorus nutrients. It is generally believed at home and abroad that sediment dredging is the most effective control engineering measure to solve the pollution of water body bottom sediment and prevent and control water body eutrophication. According to incomplete statistics, all countries in the world are carrying out dredging projects for water body sediment every year, and the amount of dre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00
Inventor 栾兆坤梁震王军贾智萍
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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