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Heavy metal wastewater treatment material and method thereof

A technology for heavy metals and wastewater, applied in water/sewage treatment, chemical instruments and methods, neutralized water/sewage treatment, etc., can solve the problems of large amount of sedimented sludge, high moisture content, difficult treatment, etc., and achieve product moisture content Low, stable effluent pH, easy to handle

Inactive Publication Date: 2016-08-17
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the common problems are that the sedimentation particles are small and require a sedimentation tank. It is difficult to completely separate the new fine particles from the water, the water treatment effect is unstable, the amount of sedimentation sludge is large, the water content is high, and the treatment is difficult.
The impact of these mineral materials or modified products on Cd in wastewater 2+ , Pb 2+ , Hg 2+ 、Cu 2+ etc. have a strong adsorption effect, but the adsorption capacity is limited, and some adsorption materials are difficult to separate solid-liquid and sludge dewatering due to their colloidal properties.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Select magnesite massive ore, wherein the content of magnesium carbonate is 90%;

[0024] Calcined magnesite at 700-900°C, crushed through 200 mesh, added water to shape into 2-10mm particles, natural curing, and obtained a composite material with particle strength composed of magnesium oxide, magnesium carbonate, and magnesium hydroxide;

[0025] Select the attapulgite dolomite in the attapulgite clay ore, in which the dolomite content is 75%, crush and sieve to obtain 2-3mm granular material B.

[0026] Mix the two materials of A and B according to the mass ratio of 5:1;

[0027] Add the mixed granular material to a Ф20mm high 500mm experimental column, and lay it 30cm thick;

[0028] This embodiment prepares Pb-containing 2+ 50mg / L aqueous solution, adjust the pH value of the wastewater to 4-4.5, as a simulated heavy metal wastewater;

[0029] The prepared simulated wastewater was transported by a peristaltic pump to flow through the granular layer from bottom to ...

Embodiment 2

[0031] Select magnesite massive ore, wherein the content of magnesium carbonate is 90%;

[0032] First crush magnesite to 200 meshes, then calcined at 700-900°C, add water to shape into 2-10mm particles, natural curing, and obtain a composite material with particle strength composed of magnesium oxide, magnesium carbonate, and magnesium hydroxide;

[0033] Select the attapulgite dolomite in the attapulgite clay ore, wherein the dolomite content is 75%, crush and sieve to obtain the granular material B of 4-10mm.

[0034] Mix the two materials of A and B according to the mass ratio of 2:1;

[0035] Add the mixed granular material to a Ф20mm high 500mm experimental column, and lay it 30cm thick;

[0036] This example prepares Cu-containing 2+ 50mg / L aqueous solution, adjust the pH value of the wastewater to 4, as a simulated heavy metal wastewater;

[0037] The prepared simulated wastewater was transported by a peristaltic pump to flow through the granular layer from bottom t...

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PUM

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Abstract

The invention discloses a heavy metal wastewater treatment method. The heavy metal wastewater treatment method is characterized in that a heavy metal wastewater treatment material is formed through mixing a granular material A with a granular material B according to a certain ratio. A preparation method of the material A comprises the following steps: calcining magnesite at 700-900DEG C, crushing the calcined magnesite, sieving the crushed magnesite by a 200 mesh sieve, adding water, forming 2-10mm particles, and naturally curing the particles to obtain the granular strength composite material formed by magnesium oxide, magnesium carbonate and sodium hydroxide. The material A is a 2-10mm granular material obtained through crushing and screening attapulgite and dolostone. The material A and the material B are mixed according to a mass ratio of 1:1-10:1, and the obtained mixture is used to treat heavy metal-containing wastewater.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment and utilization of non-metallic mineral resources, and relates to water treatment materials and methods. Background technique [0002] There are tens of billions of cubic meters of wastewater containing heavy metals in my country every year, including wastewater from mining, smelting, electrolysis, electroplating, pesticides, medicine, paint, chemicals, pigments and other industries. The discharge of heavy metal wastewater leads to heavy metal pollution in rivers, lake sediments, especially soil, which not only destroys the ecological environment, but also can enrich and enter the human body through the food chain and threaten human health. [0003] At present, the treatment methods of heavy metal wastewater at home and abroad can be divided into two categories: one is to convert the dissolved heavy metal ions in the wastewater into insoluble heavy metal compounds, and then remove th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52C02F1/66C02F101/20
CPCC02F1/5236C02F1/66C02F2101/20
Inventor 李宏伟田漪兮陈天虎谢晶晶王翰林程鹏
Owner HEFEI UNIV OF TECH
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