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Method for treating industrial wastewater containing heavy metal contaminants by utilizing industrial fly ash and nano iron

A technology for industrial wastewater and fly ash, applied in water pollutants, chemical instruments and methods, water/sewage treatment, etc., can solve the problems of heavy metal dissolution, difficult recovery, and agglomeration, so as to reduce heavy metal dissolution and production Low cost and the effect of reducing agglomeration phenomenon

Inactive Publication Date: 2017-05-24
TIANJIN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, many scholars at home and abroad have also found that nZVI also has many shortcomings in the removal of heavy metal pollutants, such as agglomeration, easy oxidation, long-term dissolution of heavy metals, and difficult recovery.

Method used

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  • Method for treating industrial wastewater containing heavy metal contaminants by utilizing industrial fly ash and nano iron
  • Method for treating industrial wastewater containing heavy metal contaminants by utilizing industrial fly ash and nano iron
  • Method for treating industrial wastewater containing heavy metal contaminants by utilizing industrial fly ash and nano iron

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Experimental program
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Effect test

Embodiment １

[0059] (1) First weigh a certain amount of industrial fly ash (grade I) at room temperature, soak the fly ash in water, add 10% ferric chloride (calculated as Fe) and mix thoroughly, then add borocyanide dropwise The amount of sodium chloride is 20.8g / (100g composite material) to reduce ferric ions to zero-valent nano-iron, and load it on the fly ash. Add fly ash-nano-iron composite material to industrial wastewater containing heavy metal pollutants such as cadmium, stir and fully react at room temperature, precipitate and separate after reacting for 5 minutes, and recover fly ash-nano-iron composite material, after precipitation The supernatant of the supernatant can meet the relevant comprehensive sewage discharge standards and be discharged directly; the weight ratio of fly ash and nano-zero-valent iron is 1:0.11; the particle size of industrial fly ash is 0.5-10 μm, and the nano-zero-valent iron Iron particle size 80~120 nm;

[0060] The content of nano-zero-valent iron a...

Embodiment 2

[0064] A method for treating industrial wastewater containing heavy metal pollutants using fly ash and nano-iron composite materials:

[0065] (1) First mix industrial fly ash and ferric chloride solution components at room temperature, and then dropwise add sodium borocyanide in the mixed solution at an amount of 20.8g / (100g composite material) to reduce ferric ions into nano Zero-valent iron is loaded onto the fly ash to obtain a fly ash-nanometer iron composite material; wherein the weight and number ratio of fly ash and nano-zero-valent iron is 1:0.11;

[0066] The particle size of the industrial fly ash is 0.5-10 μm, and the particle size of the nano-zero-valent iron is 80-120 nm;

[0067] (2) Then add industrial wastewater containing heavy metal pollutants (Pb and Zn) to the composite material for reaction, stir and fully react at room temperature, and let it stand for 5 minutes (~60 min) to obtain supernatant and sediment; The weight ratio of the material to the indust...

Embodiment 3

[0070] A method for treating industrial wastewater containing heavy metal pollutants using industrial fly ash and nano-iron composite materials:

[0071] (1) First mix industrial fly ash and ferric chloride solution components at room temperature, then add sodium borocyanide dropwise in the mixed solution to reduce ferric ions to nanometer zero-valent iron, and load them on fly ash , so as to obtain industrial fly ash-nano-iron composite material; wherein the mass ratio of industrial fly ash and nano-zero-valent iron is 1:0.22; the particle size of industrial fly-ash is 0.5-10 μm, and the nano-zero-valent iron particles The diameter is 80~120nm; the dosage of sodium borocyanide is 41.6g / (100g composite material.

[0072] (2) Then add industrial wastewater containing heavy metal pollutants (including Cd, Cr, Cu, Pb and Zn) to the composite material for reaction, stir and fully react at room temperature, and let it stand for 30 minutes to obtain supernatant and sediment ; where...

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Abstract

The invention discloses a method for treating industrial waste water containing heavy metal contaminants by utilizing industrial fly ash and nano iron. The method comprises the following steps of: firstly, fully mixing industrial fly ash and a ferric chloride solution at room temperature; and secondly, dropwise adding sodium cyanoborohydride to the mixed solution to reduce trivalent iron ions to zero-valent nano iron, and loading onto fly ash particles to obtain a fly ash-nano iron composite material. The fly ash-nano iron composite material is added to the industrial wastewater containing heavy metal contaminants, and is treated and recovered at normal temperature. The precipitated supernatant can meet the relevant integrated wastewater discharge standards to be directly discharged, wherein the zero-valent nano iron accounts for 10% of the composite material in mass, the concentration of the wastewater containing heavy metal contaminants is less than or equal to 100 mg / L, and the pH value of the wastewater containing heavy metal is 5.6 to 9. The method has the advantages of making full use of nano-sized silica particles with a large specific surface area in fly ash, improving the removal rate of the industrial wastewater containing heavy metal contaminants, solving the problems that the nano iron is easily oxidized and agglomerated, and adsorbents are difficultly recovered and the like, improving efficiency and saving cost, and achieving the purpose of water environmental pollution reduction and recovery and comprehensive utilization of resources.

Description

[0001] This application is supported by the project of "Cultivation Program for Young and Middle-aged Innovative Talents" (ZX110GG019) of Tianjin Universities. technical field [0002] The invention belongs to the technical field of environmental protection, relates to industrial waste water treatment and comprehensive utilization of solid waste, in particular to a method for treating industrial waste water containing heavy metal pollutants by using industrial fly ash and nano-iron composite materials. Background technique [0003] With the development of social economy and the continuous increase of population, the discharge of industrial wastewater has also increased sharply, and a large amount of heavy metal pollutants have been discharged into the environment. Among them, the discharge of industrial wastewater containing cadmium and heavy metals has become more and more serious to the environment. Cadmium is bioaccumulative and toxic, and it is difficult to degrade, threa...

Claims

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Application Information

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IPC IPC(8): C02F1/28C02F101/20
CPCC02F1/281C02F1/288C02F2101/20C02F2209/02C02F2209/06C02F2305/08
Inventor 吴光红卫琪孙聪慧马利霞
Owner TIANJIN NORMAL UNIVERSITY
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