Preparation method and application of extractant for heavy metals in sludge

A technology of heavy metals and extractants, applied in sludge treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problems of long treatment period, high operation cost, poor heavy metal removal effect, etc., and meet the requirements of Requirements for heavy metal content, the effect of reducing the content of heavy metal elements

Inactive Publication Date: 2014-07-16
XI'AN POLYTECHNIC UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a sludge heavy metal extractant, which solves the problems of long treatment period, high operating cost and poor heavy metal removal effect in the prior art when sludge heavy metal removal and dehydration treatment is carried out

Method used

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  • Preparation method and application of extractant for heavy metals in sludge

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preparation example Construction

[0025] The preparation method of the sludge heavy metal extractant of the present invention specifically carries out according to the following steps:

[0026] Step 1, weighing the raw materials according to the proportion, wherein the ratio of each raw material to the dissolved solute in distilled water is 8-15% of polyaluminum chloride, 0.3-0.6% of polyacrylamide, 1.8-2.4% of ethylenediaminetetraacetic acid, dodecyl Sodium sulfonate 1.0-2.0%, the rest is distilled water.

[0027] Step 2: Dissolve the solid raw materials in step 4 in step 1 with distilled water to prepare polyaluminum chloride (PAC) solution, ethylenediaminetetraacetic acid (EDTA) solution, polyacrylamide and sodium dodecylsulfonate respectively The mixed solution (PAM+SDS) of the three solutions; the preparation process is stirred at a speed of 80-100 rpm, heated, and the temperature of the solution is controlled between 25-30°C until there is no obvious precipitation in the solution.

[0028] Step 3, mix t...

Embodiment 1

[0045] Weigh the raw materials according to the following proportions: 8% polyaluminum chloride, 0.6% polyacrylamide, 2.4% ethylenediaminetetraacetic acid, 1.5% sodium dodecylsulfonate, and the rest is solvent distilled water. The total amount of the above components is 100%. Three solutions of PAC, EDTA and PAM+SDS were prepared respectively. During the preparation process, the mixture was stirred at a speed of 80 rpm, and heated, and the temperature of the solution was controlled at 25° C. until there was no obvious precipitation in the solution, and the three prepared solutions were mixed. During the mixing process, stir at a speed of 95 rpm, heat appropriately, and control the temperature of the solution at 28°C. Adjust the pH of the solution prepared in step 3 to 10 with NaOH solution to obtain the sludge heavy metal extractant.

[0046] Use the prepared sludge heavy metal extractant for sludge treatment. First, the sludge is pre-concentrated to reduce the water content o...

Embodiment 2

[0053] Weigh the raw materials according to the following proportions: 15% polyaluminum chloride, 0.5% polyacrylamide, 1.8% ethylenediaminetetraacetic acid, 1.0% sodium dodecylsulfonate, and the rest is solvent distilled water. The total amount of the above components is 100%. Three solutions of PAC, EDTA and PAM+SDS were prepared respectively. During the preparation process, the mixture was stirred at a speed of 90 rpm, heated, and the temperature of the solution was controlled at 28° C. until there was no obvious precipitation in the solution, and the three prepared solutions were mixed. During the mixing process, stir at a speed of 85 rpm, heat appropriately, and control the temperature of the solution at 30°C. Adjust the pH of the solution prepared in step 3 to 9 with NaOH solution to obtain the sludge heavy metal extractant.

[0054] Use the prepared sludge heavy metal extractant for sludge treatment. First, the sludge is pre-concentrated to reduce the water content of ...

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Abstract

The invention discloses an extractant for heavy metals in sludge. The extractant comprises the following components by weight: 8-15% of poly aluminum chloride, 0.3-0.6% of polyacrylamide, 1.8-2.4% of ethylenediaminetetraacetic acid, 1-2% of sodium dodecyl sulfate and the balance of solvent distilled water, and the total weight of the components is 100%. The invention also discloses a preparation method of the extractant for the heavy metals in the sludge. The raw material components are dissolved to prepare three solutions, then the three solutions are mixed, and the solution preparation process and mixing process are carried out at a certain temperature and stirring speed. The invention also discloses a sludge treatment method by use of the extractant for the heavy metals in the sludge; the sludge is pre concentrated, then the extractant for the heavy metals in the sludge is added for hardening and tempering, and deep dehydration is performed after a period of time of reaction in a tempering and quenching tank to obtain the sludge with the heavy metals extracted. The sludge treatment method solves the problems that sludge treatment methods in the prior art are long in treatment time when used in heavy metal removal and dehydration of the sludge, high in operation cost, and not good in heavy metal removal efficiency.

Description

technical field [0001] The invention belongs to the technical field of sludge treatment and resource utilization, and relates to a sludge heavy metal extractant. The invention also relates to a preparation method of the above sludge heavy metal extractant, and a method of using the above sludge heavy metal extractant for sludge treatment. method. Background technique [0002] Sludge is a by-product produced in the process of sewage treatment in urban sewage treatment plants. It is generally a solid sediment formed by the sludge in the first settling tank and the remaining activated sludge. The moisture content of the sludge is about 99%. Usually, the sludge is concentrated in the gravity concentration tank first, and then enters the subsequent treatment unit for deep dehydration treatment, which generally reduces the moisture content to about 80%. [0003] The composition of sludge is complex. It is an aggregate composed of bacterial micelles formed by various microorganism...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00
Inventor 孙先锋金鹏康
Owner XI'AN POLYTECHNIC UNIVERSITY
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